12 SQL Developer interview questions and answers
Find and hire talent with confidence. Prepare for your next interview. The right questions can be the difference between a good and great work relationship.
What is a Relational Database Management System (RDBMS), and which one are you most familiar with?
A RDBMS is a system that organizes data into tables called relations, which are further organized into columns (fields) and rows (often called tuples). The relational model allows data to be queried in a nearly unlimited number of ways, making it great for sorting through large volumes of data. It’s important to pick a SQL developer who’s experienced with the particular set of web technologies you plan to use to support your app. Common SQL dialects include PL/SQL for Oracle, T-SQL for MS SQL, and JET SQL for MS Access. Look up any particular dialects used for your chosen RDBMS.
What are the standard SQL commands every SQL developer should know?
The basic SQL commands can be organized into the following categories:
- Data Manipulation Language (DML)
- INSERT: Creates records. The “Create” in CRUD.
- SELECT: Retrieves records. The “Read” in CRUD.
- UPDATE: Modifies records. The “Update” in CRUD.
- DELETE: Deletes records. The “Delete” in CRUD.
- Data Definition Language (DDL)
- CREATE: Creates a new object.
- ALTER: Alters an existing object.
- DROP: Deletes an existing object.
- Data Control Language: (DCL)
- GRANT: Grants privileges to users.
- REVOKE: Revokes privileges previously granted to a user.
In practice however, you should be aware that your typical developer is most likely going to answer this question with CRUD (Create, Read, Update, and Delete), the four essential database operations for database manipulation. Bonus points if they also mention some of the others.
Can you explain how a RDBMS organizes data into tables and fields?
A table is composed of columns (fields) and rows (records or tuples). Each record can be considered as an individual entry that exists within the table and contains multiple fields. For example, a data entry (record) for a customer might consist of the fields: ID, name, address, and purchase.
What is a NULL value and how does it differ from a zero value?
The easiest way to explain this difference is to recognize that zero is a value representing the number zero. NULL is a non-value or a placeholder for data that is not currently known or specified. The result of any operation on a NULL value, as in arithmetic, will be undefined.
What are SQL Constraints?
Constraints are rules you can place on columns or tables to limit the type of data that can be entered into a table. This prevents errors and can improve the accuracy and reliability of the database as a whole. Common constraints include:
- NOT NULL: Prevents a column from having a NULL value.
- DEFAULT: Specifies a default value for a column where none is specified.
- PRIMARY KEY: Uniquely identifies rows/records within a database table.
- FOREIGN KEY: Uniquely identifies rows/records from external database tables.
- UNIQUE: Ensures all values are unique.
- CHECK: Checks values within a column against certain conditions.
- INDEX: Quickly creates and retrieves data from a database.
Name four ways to maintain data integrity within a RDBMS.
When it comes to storing data accurately, consistently, and reliably within a RDBMS, there are four general types of data integrity that you can implement:
- Entity (Row) Integrity: Avoids duplicate rows in tables.
- Domain (Column) Integrity: Restricts the type, format, or range of values to enforce valid entries.
- Referential Integrity: Ensures rows used by other records cannot be deleted.
- User-Defined Integrity: Enforces rules set by the user that do not fall into the other categories.
What is the purpose of database normalization and how does it work?
The primary purpose of normalization is to make databases more efficient by eliminating redundant data and ensuring data dependencies are coherent. Storing data logically and efficiently reduces the amount of space the database takes up and improves performance. The set of guidelines used to achieve normalization are called normal forms, numbered from 1NF to 5NF. A form can be thought of as a best-practice format for laying out data within a database.
Explain the difference between an inner join and outer join using an example.
An inner join is when you combine rows from two tables and create a result set based on the predicate, or joining condition. The inner join only returns rows when it finds a match in both tables. An outer join will also return unmatched rows from one table if it is a single outer join, or both tables if it is a full outer join. A solid example of this will clearly illustrate the difference and demonstrate how well the developer understands joins.
What is wrong with the SQL query below?
SELECT UserId, AVG(Total) AS AvgOrderTotal
FROM Invoices
HAVING COUNT(OrderId) >= 1
The issue here is that there must be a GROUP BY clause here. This query will get the average order amount by customer (UserId) where the customer has at least 1 order. The correct query is listed below:
SELECT UserId, AVG(Total) AS AvgOrderTotal
FROM Invoices
GROUP BY Userid
HAVING COUNT(OrderId) >= 1
Consider the two tables below. Write a query that retrieves all employees recruited by John Do. How would you write a second query to retrieve all employees that were not recruited by any recruiter?
Employee Table
Id | Name | RecruitedBy |
---|---|---|
1 | Jean Grayson | NULL |
2 | Paul Smith | 1 |
3 | John Do | NULL |
4 | Alex Lee | 3 |
5 | Lisa Kim | 3 |
6 | Bob Thompson | NULL |
Recruiter Table
Id | Name |
---|---|
1 | Bob Smith |
2 | Paul Allen |
3 | John Do |
The following query will retrieve all recruiters recruited by John Do. SELECT Employee.
Name FROM Employee
JOIN Recruiter ON Employee.RecruitedBy = Recruiter.Id
WHERE RecruitedBy = 3
To retrieve all employees who were not recruited by anyone in the recruiter table, you could use the following query:
SELECT Employee.Name FROM Employee
JOIN Recruiter ON Employee.RecruitedBy = Recruiter.Id
WHERE RecruitedBy Is Null
Write a SQL query to find the 10th tallest peak (“Elevation”) from a “Mountain” table. Assume that there are at least 10 records in the Mountain table. Explain your answer.
This can be accomplished using the “TOP” keyword as follows.
SELECT TOP (1) Elevation FROM
(
SELECT DISTINCT TOP (10) Elevation FROM Mountain ORDER BY Elevation DESC
) AS Mt ORDER BY Elevation
The first query takes the top 10 mountains by elevation in the table and lists them in descending order, with the tallest mountain at the top of the list. However, since we want the 10th tallest mountain, the second query, “ AS Mount ORDER BY Elevation”, promptly reorders the list of 10 in ascending order before the top record is selected. Note that not all databases support the “TOP” keyword, so answers may vary. Another possible solution that follows a similar logic for MySQL or PostreSQL is detailed below, this time using the “LIMIT” keyword.
SELECT Elevation FROM
(
SELECT DISTINCT Elevation FROM Mountain ORDER BY Elevation DESC LIMIT 10
) AS Mt ORDER BY Elevation LIMIT 1;
Given two tables created in the code block below, how would you write a query to fetch values in table “fibonacci” that are not in table “prime” without using the “NOT” keyword? Can you name a database technology where this is not possible?
create table fibonacci(id numeric);
create table prime(id numeric);
insert into fibonacci(id) values
(2),
(3),
(5),
(8),
(13),
(21);
insert into prime(id) values
(2),
(3),
(5),
(13);
SQLite, PostgreSQL, and SQL Server all support the ever useful “except” keyword which can be employed as detailed below
select * from fibonacci
except
select * from prime;
A popular database technology that does not support “except” is MySQL, which is why it must use the “not in” keyword. Note that for Oracle, the “minus” keyword must be used instead.
SQL Developer Hiring Resources
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- $25/hr $25 hourly
Aaron A.
- 5.0
- (13 jobs)
Accra, GREATER ACCRASQL
GitData EntryArcGISQGISTopic ResearchDockerFastAPITableauPythonMachine Learning ModelGoogle SheetsMicrosoft Power BIData Analysis✅Top Rated IBM Certified Data Scientist with 💯% Job Success Score Hi there! 👋 My name is Aaron, an experienced Data Scientist/Analyst and a GIS expert with over 4 years of experience. My Services: • Data Analysis (MS Excel, SQL, Python) • Data Visualization (Power BI, Tableau, MS Excel) • Time Series Forecasting (Univariate and Multivariate modeling) • Machine Learning Classification and Prediction • Machine Learning Model Deployment (FastAPI, Streamlit, Gradio) • Web Scrapping/Web Research and Data Management in Google Sheets • Online Data Collection (Kobo Tools, Collector for ArcGIS) • Virtual Assistantship with MS Excel. • Online Mapping, Cartography, and ArcGIS StoryMaps Creation • GIS Analysis with ArcGIS and QGIS • Academic Research Data Analysis (STATA and SPSS) • Data Science/Analytics Tutoring My Average Rating: ⭐⭐⭐⭐⭐ Achievements: ✅Analyzed and predicted customer churn in a forex start-up in Germany. Informed us on where to concentrate our advertisements. lead to over 3000 stable customers within the period of 8 months. ✅Predicted which advertisement channel has the most impact on revenue. This led to a 40% cut in costs and increased revenue by 60%. ✅Collaborated with the GIS department of Ghana Cocoabod to mitigate the spread of the cocoa- swollen Shoot Virus through analytics and visualization. Contributes to effective and efficient monitoring of rehabilitation activities on and off-farm, leading to over 50% improved cocoa bean yield. ✅Discovered insights on the impacts of fertilization in cocoa on its productivity for the period of 2016 through 2020 through data analytics and visualization. Came out with clear map-outs for optimized distribution of fertilizer and other inputs to cocoa farmers which cut down on distribution and application costs by 50%. With expertise in a wide range of tools and statistical packages, I am dedicated to leveraging Data Science and Artificial Intelligence to drive growth and success for my clients. Let's talk about your data needs, be it spatial or attribute data! Thank you! - $55/hr $55 hourly
Mounika C.
- 5.0
- (1 job)
Ayer, MASQL
PythonData CollectionData CleaningData AnalysisMicrosoft ExcelTableauMicrosoft Power BIAround 8 years of expertise in IT, with knowledge of Agile Methodologies and the full Software Development Life Cycle, which includes requirement analysis, design, development, testing, and implementation. Vast knowledge of Microsoft SQL Server and MS Power BI reporting tools. Proven track record of interacting with stakeholders, SMEs, and end users to better comprehend, evaluate, convey, and validate requirements. Proficient in creating multiple kinds of data visualization dashboards. Complete understanding of all facets of the Software Development Life Cycle (SDLC) Experience with SQL script (procedures, functions, sequence, DB triggers), CE functions, Virtual Data Model (VDM), Core Data Services (CDS), DDL, DML, DB views, synonyms, indexes, temporary column tables, table types, and partitioning. Knowledge of information models, including decision tables, hierarchies, attribute views, analytical views, and calculation views based on SQL scripts. High availability, referential, text joins and scaling, scoping, and Using Query Editor to establish connections to various data sources and perform data model construction. Making new Measures, Calculated Columns, and Calculated Tables. Expertise in creating bespoke reports using MS Power BI, as well as a variety of tabular, matrix, ad hoc, drill down, parameterized, cascade, conditional, table, chart, and sub reports. Establishing connections between tables from various data sources. Creating dashboards and sharing them with business users using Power BI Service. Using DAX formulas to create variables such as Previous Month, Previous Quarter, and so on additionally, utilizing geographic data to create dynamic visualizations. Created reports by importing data into SQL Server in Power BI via Azure Data Link (ADL) - $95/hr $95 hourly
Leigh S.
- 5.0
- (14 jobs)
Morrisville, NCSQL
Web TestingAdobe ColdFusionASP.NETWordPress MultisiteWeb DesignAdobe PhotoshopPHPMySQLWordPressI triple majored in engineering at NCSU with a concentration in programming. I later followed with a Masters in Business with a concentration in small business entrepreneurship. I've worked in programming and project management for almost 20 years and have worked with some of the largest SEO agencies in the world. I have a lot of experience with WordPress as well as many other platforms and coding languages and feel confident I could build whatever you need. These experiences make me qualified to lead projects of any size to completion and ensure client satisfaction. Please feel free to take a look at my portfolio. I welcome the opportunity to speak about any project type and the possibility of working together in the future.
- $25/hr $25 hourly
Aaron A.
- 5.0
- (13 jobs)
Accra, GREATER ACCRASQL
GitData EntryArcGISQGISTopic ResearchDockerFastAPITableauPythonMachine Learning ModelGoogle SheetsMicrosoft Power BIData Analysis✅Top Rated IBM Certified Data Scientist with 💯% Job Success Score Hi there! 👋 My name is Aaron, an experienced Data Scientist/Analyst and a GIS expert with over 4 years of experience. My Services: • Data Analysis (MS Excel, SQL, Python) • Data Visualization (Power BI, Tableau, MS Excel) • Time Series Forecasting (Univariate and Multivariate modeling) • Machine Learning Classification and Prediction • Machine Learning Model Deployment (FastAPI, Streamlit, Gradio) • Web Scrapping/Web Research and Data Management in Google Sheets • Online Data Collection (Kobo Tools, Collector for ArcGIS) • Virtual Assistantship with MS Excel. • Online Mapping, Cartography, and ArcGIS StoryMaps Creation • GIS Analysis with ArcGIS and QGIS • Academic Research Data Analysis (STATA and SPSS) • Data Science/Analytics Tutoring My Average Rating: ⭐⭐⭐⭐⭐ Achievements: ✅Analyzed and predicted customer churn in a forex start-up in Germany. Informed us on where to concentrate our advertisements. lead to over 3000 stable customers within the period of 8 months. ✅Predicted which advertisement channel has the most impact on revenue. This led to a 40% cut in costs and increased revenue by 60%. ✅Collaborated with the GIS department of Ghana Cocoabod to mitigate the spread of the cocoa- swollen Shoot Virus through analytics and visualization. Contributes to effective and efficient monitoring of rehabilitation activities on and off-farm, leading to over 50% improved cocoa bean yield. ✅Discovered insights on the impacts of fertilization in cocoa on its productivity for the period of 2016 through 2020 through data analytics and visualization. Came out with clear map-outs for optimized distribution of fertilizer and other inputs to cocoa farmers which cut down on distribution and application costs by 50%. With expertise in a wide range of tools and statistical packages, I am dedicated to leveraging Data Science and Artificial Intelligence to drive growth and success for my clients. Let's talk about your data needs, be it spatial or attribute data! Thank you! - $55/hr $55 hourly
Mounika C.
- 5.0
- (1 job)
Ayer, MASQL
PythonData CollectionData CleaningData AnalysisMicrosoft ExcelTableauMicrosoft Power BIAround 8 years of expertise in IT, with knowledge of Agile Methodologies and the full Software Development Life Cycle, which includes requirement analysis, design, development, testing, and implementation. Vast knowledge of Microsoft SQL Server and MS Power BI reporting tools. Proven track record of interacting with stakeholders, SMEs, and end users to better comprehend, evaluate, convey, and validate requirements. Proficient in creating multiple kinds of data visualization dashboards. Complete understanding of all facets of the Software Development Life Cycle (SDLC) Experience with SQL script (procedures, functions, sequence, DB triggers), CE functions, Virtual Data Model (VDM), Core Data Services (CDS), DDL, DML, DB views, synonyms, indexes, temporary column tables, table types, and partitioning. Knowledge of information models, including decision tables, hierarchies, attribute views, analytical views, and calculation views based on SQL scripts. High availability, referential, text joins and scaling, scoping, and Using Query Editor to establish connections to various data sources and perform data model construction. Making new Measures, Calculated Columns, and Calculated Tables. Expertise in creating bespoke reports using MS Power BI, as well as a variety of tabular, matrix, ad hoc, drill down, parameterized, cascade, conditional, table, chart, and sub reports. Establishing connections between tables from various data sources. Creating dashboards and sharing them with business users using Power BI Service. Using DAX formulas to create variables such as Previous Month, Previous Quarter, and so on additionally, utilizing geographic data to create dynamic visualizations. Created reports by importing data into SQL Server in Power BI via Azure Data Link (ADL) - $95/hr $95 hourly
Leigh S.
- 5.0
- (14 jobs)
Morrisville, NCSQL
Web TestingAdobe ColdFusionASP.NETWordPress MultisiteWeb DesignAdobe PhotoshopPHPMySQLWordPressI triple majored in engineering at NCSU with a concentration in programming. I later followed with a Masters in Business with a concentration in small business entrepreneurship. I've worked in programming and project management for almost 20 years and have worked with some of the largest SEO agencies in the world. I have a lot of experience with WordPress as well as many other platforms and coding languages and feel confident I could build whatever you need. These experiences make me qualified to lead projects of any size to completion and ensure client satisfaction. Please feel free to take a look at my portfolio. I welcome the opportunity to speak about any project type and the possibility of working together in the future. - $90/hr $90 hourly
Stephanie D.
- 4.9
- (6 jobs)
Palmertown, CTSQL
Database ModelingDatabase TestingQuickBooks Online APIDatabase ManagementIntuit QuickBooksQuickBaseDatabase DesignPHPJavaScriptI work full-time as an Operations Manager to make processes more efficient. I've helped eliminate countless spreadsheets, merged data from multiple systems into a structure I helped design & build, written custom report pages, set up automatically triggered notifications, scheduled report deliveries, and much more. I want to empower your business not only to save time & money by automating manual processes, but also to make more informed decisions by providing clear, concise reporting. I love what I do. It's very rewarding to be able to say "Yes, of course we can make that better!" and also be able to deliver on that promise quickly. Using a low-maintenance database platform called Quick Base, I'm able to do this in a matter of weeks rather than months. Additionally, I would be more than happy to train a member of your staff on how to maintain & make updates to the database--no programming knowledge required, just a computer savvy employee will do the trick! Please read our company's case study/success story with Quick Base if you're interested. I will place a link in the portfolio section. Thanks for reading, hope to speak with you soon! - $50/hr $50 hourly
Robert H.
- 5.0
- (22 jobs)
Ocklawaha, FLSQL
jQueryMicrosoft OfficeResponsive DesignCSS 3HTML5WordPressJoomlaPHPJavaScriptI have a love of Web Development and IT in general that I bring to all my work. I am meticulous and am always learning more about my field to both stay current and to expand on my skills. I have about 6 years of experience working in this field plus a couple more years setting up websites and doing programming while I was learning, I have a real love of IT and Web Development. I find the whole field endlessly fascinating. I have a problem-solving attitude so bring on your problems and I will get them fixed. As a Mensa member I am able to add on new needed skills and knowledge very quickly. • Excellent problem-solving skills • Specializing in WordPress • Proficiency with Systems Administration and Tech Support work • Expertise creating and maintaining hundreds of websites • Active Directory and Windows Server experience • Experienced at troubleshooting websites and fixing hacked sites • Proficient in WordPress, Joomla and coded sites • Familiarity with Adobe Products (Web Premium CSS5) • Skills with Microsoft Office Products If something is wrong with your WordPress site I can probably fix it for you. I will also give recommendations for improvements for any site I work on. Forms, PHP, JavaScript, CSS or HTML just let me know what you need. If something is broke, hacked or you just want a change or something added let me know. Everything from a brand new site to fixing a hack to a Site Maintenance Contract. I can present my resume, portfolio and references on request CERTIFICATIONS • W3Schools certifications in HTML (with Excellence), CSS (with Excellence), JavaScript (with Excellence), jQuery (94%) and PHP (90% and includes SQL). With Excellence awarded for test scores of 95% or better. • HIPAA certifications in HIPAA Security and HIPAA Awareness for Healthcare Providers from HIPPATraining.org. Valid from Jan. 2019 through Jan. 2021. - $60/hr $60 hourly
Pero M.
- 5.0
- (10 jobs)
Bitola, BITOLASQL
Apache KafkaXMLAPI IntegrationJSONApache MavenSpring IntegrationSalesforceGradleSnapLogicSpring BootAPICSSJavaScriptHTMLJavaSpecialized Java and certified SnapLogic developer, practicing java for more than 4 years and Data Integration (SnapLogic) almost 3 years. You can see/verify my certification in certification section bellow. Also for my self I could say that I'm Salesforce enthusiast, every spare free time I used for learning Salesforce platform. Highly motivated and hardworking, willing to learn new skills also eager to absorb as much knowledge and insight as possible ability to maintain high level of confidentiality. I have good work ethic, capable to work with a team, always on time(fulfill deadlines). - $80/hr $80 hourly
Paul S.
- 5.0
- (3 jobs)
Turbenthal, ZURICHSQL
Citrix HypervisorVirtualizationMicrosoft Endpoint ManagerMicrosoft Azure AdministrationMicrosoft AzureMicrosoft SharePoint AdministrationSystems EngineeringMicrosoft Azure SQL DatabaseSystem AdministrationWindows ServerYour Go-To Cloud Technology Expert Over 35 years of experience in architecting, designing, planning, implementing and developing IT systems and services. I am a British, Switzerland based Cloud Solutions Engineer having worked with Microsoft products since the 1990s. For the past few years I have been working with Microsoft Azure and Microsoft 365. Adept at troubleshooting and fault-finding systems, including Microsoft, Apple and open-source systems and services. GDPR Compliance Specialist. Remote Work Infrastructure Expert: Proficient in setting up both cloud and on-premises infrastructure to enable efficient remote work. Skilled in implementing VDI, Azure Virtual Desktop(AVD), Remote Desktops/Remote Apps, VPNs, Application Proxy, Office 365, SharePoint, Teams, Teams Voice, Azure Arc, Entra Connect, MDM, and Intune. Migration and Upgrade Specialist: - Configured and monitored security tools such as Azure Defender for Cloud and Azure Sentinel to detect and respond to security threats effectively, resulting in a 25% improvement in threat detection capabilities. - Leading the migration of a legacy production application to scalable Azure Kubernetes Services, modernizing the app with advanced authentication and private cluster configuration, resulting in significantly reduced infrastructure costs and enhanced security. - Developing a comprehensive roadmap for secure cloud networking by implementing private endpoint and VNet integration, thereby strengthening cloud network security and operational efficiency. - Building and optimising Azure DevOps pipelines for CI/CD based deployment of production workloads, achieving streamlined, faster, and more reliable deployment processes. - Modernising applications to a container platform including Container Apps, AKS, and container instances, adhering to cybersecurity standards such as NIST and CIS, effectively securing the infrastructure, and saving on compute costs. - Successfully migrated over 6,000 mailboxes from Exchange on-prem. - Handled over 1,000 Active Directory migrations impacting over 500,000 users. - Achieved a significant 70% cost reduction in cloud expenditures. - Streamlined infrastructure deployment and management, saving nearly 20% in resource time and deployment efforts. Using ShareGate to migrate SharePoint data between SharePoint document libraries, between, sites, between farms and from on-premise to online. As a dedicated consultant, I am committed to bolstering your organisation's security and efficiency. My approach involves a thorough understanding of your unique needs, followed by the deployment of cutting-edge Microsoft technologies to create a secure and streamlined remote work environment, including Teams Voice. 🌟 Let's Collaborate and contact me to discuss how we can partner to fully meet your business needs with top-notch security and automation solutions! - $70/hr $70 hourly
Abbas N.
- 5.0
- (5 jobs)
Charlottesville, VASQL
AutomationSoftware DevelopmentCryptographyInformation SecurityAPI IntegrationFull-Stack DevelopmentAI DevelopmentMachine LearningArtificial IntelligenceGolangJavaPythonNode.jsJavaScriptWith rich experience in software development, including working at top-tier companies like Google, I have spent the last 12+ years specializing in AI, Full-Stack Development, and Information Security. I bring 5+ years of leadership experience as a tech lead, managing teams, and working on enterprise-level projects in fast-paced environments. I have hands-on expertise in developing and deploying cutting-edge machine learning models, deep learning, computer vision, natural language processing (NLP), Generative AI and Web Applications. My work spans across various industries, building impactful AI-driven solutions, including recommendation systems, speech recognition, and intelligent chatbots. Key Expertise: ✔️ AI & ML: Machine Learning, Deep Learning, Computer Vision, NLP, Generative AI ✔️ Speech Recognition: Whisper, Google Speech Engine, Azure Text-to-Speech, Bark, Coqui, Elevenlabs ✔️ Information Extraction: Named Entity Recognition (NER), Temporal Expressions, Event Extraction, OCR ✔️ Sentiment Analysis & Recommendation Systems ✔️ CRM & Chatbot Development: Development of intelligent customer service bots and CRM solutions ✔️ Data Science & Visualization: Tableau, Power BI, PySpark, Data Science techniques ✔️ Web Development: Full-stack web development with expertise in both front-end and back-end ✔️ Technologies: ✅ AI Libraries: TensorFlow, Keras, PyTorch, Scikit-Learn ✅ Backend Frameworks: Django, Flask, FastAPI, Express, NestJS, Spring boot, REST & GraphQL APIs ✅ Frontend: React, Angular, Vue, Next.js, TailwindCSS, HTML/CSS, JavaScript ✅ Full-Stack: MERN, MEAN, Laravel + Vue.js ✅ Databases: MySQL, MongoDB, PostgreSQL, SQLite, MS SQL ✅ Cloud & Services: AWS, Azure, GCP, Netlify, Heroku, cPanel ✅ DevOps & MLOps: Docker, Kubernetes, Git, CI/CD pipelines ✅ Programming Languages: JavaScript, Python, C#, Java, TypeScript, PHP As a 10X developer, I don’t just deliver your projects on time—I provide strategic insights into architectures and future-proof design decisions to ensure scalability, maintainability, and performance. Whether you need a machine learning model, a robust web application, or expert advice on complex architectures, I’m here to help you build innovative, high-impact solutions. - $40/hr $40 hourly
Ross C.
- 5.0
- (2 jobs)
Durants, CHRIST CHURCHSQL
PostgreSQLData CleaningData ModelingData AnalysisChemistryTechnical WritingMicrosoft Power BI Data VisualizationMicrosoft ExcelData VisualizationExperienced professional with a focus on deep-dive data analysis, I provide a range of data-driven insights to support the growth of startup businesses, as well as the sustainability of medium to large operations. My job as a data analyst revolves around product analytics, data mining and evaluation, data analytics, and other valuable tools that propel business success. By utilizing complex datasets—and developing that data into user-friendly reports and high-level dashboards—I’m able to give my clients the tools they need to optimize their business strategies and fine-tune their performance measures. Here are a few of my custom-tailored analyst offerings: • Descriptive Analytics • Predictive Analytics (Linear Regression) • Hypothesis Testing • Data Cleaning • Data modelling • Data Visualization • Dashboard Creation (Power Bi) • And More (Reach Out for Details) If you’re looking for a true data analytics professional who is also an expert in Excel and Power Bi, and capable of fluently navigating SQL, R, and Tableau, give me the opportunity to earn your business and support your short- and long-term growth efforts. - $80/hr $80 hourly
Amar K.
- 5.0
- (28 jobs)
Bengaluru, KASQL
API DevelopmentFlaskGoogle App EngineSoftware DevelopmentBig DataGoogle Cloud PlatformAmazon Web ServicesBigQueryPySparkApache AirflowApache SparkData EngineeringPythonJava𝟭𝟬+ 𝘆𝗲𝗮𝗿𝘀 𝗼𝗳 𝗘𝘅𝗽𝗲𝗿𝗶𝗲𝗻𝗰𝗲 | 𝗘𝘅𝗽𝗲𝗿𝘁-𝗩𝗲𝘁𝘁𝗲𝗱 (𝗧𝗼𝗽 𝟭%) 𝗳𝗿𝗲𝗲𝗹𝗮𝗻𝗰𝗲𝗿 | 𝗪𝗼𝗿𝗸𝗲𝗱 𝘄𝗶𝗵 𝗚𝗼𝗹𝗱𝗺𝗮𝗻 𝗦𝗮𝗰𝗵𝘀, 𝗠𝗼𝗿𝗴𝗮𝗻 𝗦𝘁𝗮𝗻𝗹𝗲𝘆, 𝗞𝗠𝗣𝗚, 𝗢𝗿𝗮𝗰𝗹𝗲 𝗲𝘁𝗰. I take pride in maintaining a 𝗽𝗲𝗿𝗳𝗲𝗰𝘁 𝗿𝗲𝗰𝗼𝗿𝗱 𝗼𝗳 𝟱-𝘀𝘁𝗮𝗿 𝗿𝗮𝘁𝗶𝗻𝗴𝘀 𝗮𝗰𝗿𝗼𝘀𝘀 𝗮𝗹𝗹 𝗽𝗿𝗼𝗷𝗲𝗰𝘁𝘀. My expertise is strongly backed by 𝗳𝘂𝗹𝗹-𝘀𝘁𝗮𝗰𝗸 𝗱𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 and 𝗰𝗹𝗼𝘂𝗱 𝗱𝗮𝘁𝗮 𝗲𝗻𝗴𝗶𝗻𝗲𝗲𝗿𝗶𝗻𝗴 𝘀𝗸𝗶𝗹𝗹𝘀, honed through work with leading institutions. With over 10+ years of experience in Data Engineering and Programming, I bring a commitment to excellence and a passion for perfection in every project I undertake. My approach is centered around delivering not just functional, but 𝗵𝗶𝗴𝗵𝗹𝘆 𝗲𝗳𝗳𝗶𝗰𝗶𝗲𝗻𝘁 𝗮𝗻𝗱 𝗼𝗽𝘁𝗶𝗺𝗶𝘇𝗲𝗱 code, ensuring top-quality outputs that consistently impress my clients. My expertise combined with extensive experience on both GCP and AWS Cloud platforms, allows me to provide solutions that are not only effective but also innovative and forward-thinking. I believe in going beyond the basics, striving for excellence in every aspect of my work, and delivering results that speak for themselves. 𝗖𝗵𝗼𝗼𝘀𝗲 𝗺𝗲 𝗶𝗳 𝘆𝗼𝘂 𝗽𝗿𝗶𝗼𝗿𝗶𝘁𝗶𝘇𝗲 𝘁𝗼𝗽-𝗻𝗼𝘁𝗰𝗵 𝗾𝘂𝗮𝗹𝗶𝘁𝘆 𝗶𝗻 𝘆𝗼𝘂𝗿 𝗽𝗿𝗼𝗷𝗲𝗰𝘁𝘀 𝗮𝗻𝗱 𝗮𝗽𝗽𝗿𝗲𝗰𝗶𝗮𝘁𝗲 𝗮 𝗳𝗿𝗲𝗲𝗹𝗮𝗻𝗰𝗲𝗿 𝘄𝗵𝗼 𝗮𝘂𝘁𝗼𝗻𝗼𝗺𝗼𝘂𝘀𝗹𝘆 𝗺𝗮𝗸𝗲𝘀 𝗼𝗽𝘁𝗶𝗺𝗮𝗹 𝗱𝗲𝗰𝗶𝘀𝗶𝗼𝗻𝘀, 𝘀𝗲𝗲𝗸𝗶𝗻𝗴 𝗰𝗹𝗮𝗿𝗶𝗳𝗶𝗰𝗮𝘁𝗶𝗼𝗻𝘀 𝗼𝗻𝗹𝘆 𝘄𝗵𝗲𝗻 𝗮𝗯𝘀𝗼𝗹𝘂𝘁𝗲𝗹𝘆 𝗻𝗲𝗰𝗲𝘀𝘀𝗮𝗿𝘆. ❝ 𝗥𝗲𝗰𝗼𝗴𝗻𝗶𝘇𝗲𝗱 𝗮𝘀 𝗨𝗽𝘄𝗼𝗿𝗸'𝘀 𝗧𝗼𝗽 𝟭% 𝗧𝗮𝗹𝗲𝗻𝘁 𝗮𝗻𝗱 𝗮𝗻 𝗲𝘅𝗽𝗲𝗿𝘁-𝘃𝗲𝘁𝘁𝗲𝗱 𝗽𝗿𝗼𝗳𝗲𝘀𝘀𝗶𝗼𝗻𝗮𝗹 ❞ 𝗔𝗿𝗲𝗮𝘀 𝗼𝗳 𝗘𝘅𝗽𝗲𝗿𝘁𝗶𝘀𝗲: - 𝗖𝗹𝗼𝘂𝗱: GCP (Google Cloud Platform), AWS (Amazon Web Services) - 𝗣𝗿𝗼𝗴𝗿𝗮𝗺𝗺𝗶𝗻𝗴 𝗟𝗮𝗻𝗴𝘂𝗮𝗴𝗲: Java, Scala, Python, Ruby, HTML, Javascript - 𝗗𝗮𝘁𝗮 𝗘𝗻𝗴𝗶𝗻𝗲𝗲𝗿𝗶𝗻𝗴: Spark, Kafka, Crunch, MapReduce, Hive, HBase, AWS Glue, PySpark, BiqQuery, Snowflake, ETL, Datawarehouse, Databricks, Data Lake, Airflow, Cloudwatch 𝗖𝗹𝗼𝘂𝗱 𝗧𝗼𝗼𝗹𝘀: AWS Lambda, Cloud Functions, App Engine, Cloud Run, Datastore, EC2, S3, - 𝗗𝗲𝘃𝗢𝗽𝘀: GitHub, GitLab. BitBucket, CHEF, Docker, Kubernetes, Jenkins, Cloud Deploy, Cloud Build, - 𝗪𝗲𝗯 & 𝗔𝗣𝗜: SpringBoot, Jersey, Flask, HTML & JSP, ReactJS, Django 𝗥𝗲𝘃𝗶𝗲𝘄𝘀: ❝ Amar is a highly intelligent and experienced individual who is exceeding expectations with his service. He has very deep knowledge across the entire field of data engineering and is a very passionate individual, so I am extremely happy to have finished my data engineering project with such a responsible fantastic guy. I was able to complete my project faster than anticipated. Many thanks.... ❞ ❝ Amar is an exceptional programmer that is hard to find on Upwork. He combines top-notch technical skills in Python & Big Data, excellent work ethic, communication skills, and strong dedication to his projects. Amar systematically works to break down complex problems, plan an approach, and implement thought-out high-quality solutions. I would highly recommend Amar! ❞ ❝ Amar is a fabulous developer. He is fully committed. Is not a clock watcher. Technically very very strong. His Java and Python skills are top-notch. What I really like about him is his attitude of taking a technical challenge personally and putting in a lot of hours to solve that problem. Best yet, he does not charge the client for all those hours, He still sticks to the agreement. Very professional. It was a delight working with him. and Will reach out to him if I have a Java or Python task. ❞ With 10+ years of experience and recognition as an Expert-Vetted (Top 1%) freelancer, I’ve delivered exceptional results for top organizations like Goldman Sachs, Morgan Stanley, and KPMG. I’m confident I can be the perfect fit for your project—let’s connect to discuss how I can help achieve your goals! - $45/hr $45 hourly
Dmitry S.
- 5.0
- (37 jobs)
Banska Bystrica, BANSKOBYSTRICKÝSQL
FlutterWeb APIEntity FrameworkPostgreSQLMySQLAngularReactCryptocurrencySoftware QAASP.NET Web API.NET FrameworkJavaScriptC#MongoDB𝗜 𝗱𝗿𝗶𝘃𝗲 𝗯𝘂𝘀𝗶𝗻𝗲𝘀𝘀 𝗚𝗥𝗢𝗪𝗧𝗛 𝗯𝘆 𝗽𝗿𝗼𝘃𝗶𝗱𝗶𝗻𝗴 𝗣𝗥𝗢𝗙𝗘𝗦𝗦𝗜𝗢𝗡𝗔𝗟 𝘄𝗲𝗯 𝗗𝗘𝗦𝗜𝗚𝗡 𝗮𝗻𝗱 𝗗𝗘𝗩𝗘𝗟𝗢𝗣𝗠𝗘𝗡𝗧 𝘀𝗲𝗿𝘃𝗶𝗰𝗲𝘀 ✨ Full-stack software development — SQL / MongoDB / .NET / C# / Node.js / TypeScript ✨ Web & mobile applications — React / Angular / Flutter ✨ UX/UI design — Figma / Photoshop / Illustrator ✨ Software architecture — ERD / UML / Scaling / Security 𝗖𝗼𝗻𝘁𝗮𝗰𝘁 𝗺𝗲 𝘁𝗼 𝘀𝘁𝗮𝗿𝘁 𝘆𝗼𝘂𝗿 𝗽𝗿𝗼𝗷𝗲𝗰𝘁 𝗿𝗶𝗴𝗵𝘁 𝗮𝘄𝗮𝘆! 𝗛𝗼𝘄 𝗜 𝘄𝗼𝗿𝗸 𝘁𝗼 𝘁𝘂𝗿𝗻 𝘆𝗼𝘂𝗿 𝗽𝗿𝗼𝗷𝗲𝗰𝘁 𝘃𝗶𝘀𝗶𝗼𝗻 𝗶𝗻𝘁𝗼 𝗿𝗲𝗮𝗹𝗶𝘁𝘆 1️⃣ Consultation — Discuss the project idea, figure out requirements, set up budget and timeline. 2️⃣ UX/UI design — Prepare middle and high fidelity design mockups and prototypes. 3️⃣ Architecture — Introduce ERD and UML diagrams to have a single point of synchronization. 4️⃣ Development and testing — Implement the project utilizing Agile methodology with 1 or 2 week sprints and incremental delivery after each iteration. 5️⃣ Deployment — Deploy the whole solution into production environment. 6️⃣ Support — Provide post-delivery support to ensure product effectiveness. 𝗪𝗵𝗮𝘁 𝗲𝘅𝗽𝗲𝗿𝘁𝗶𝘀𝗲 𝗜 𝗵𝗮𝘃𝗲 ➡ Databases & warehouses — MS SQL Server / MySQL / PostgreSQL / MongoDB / Azure Storage. ➡ Backend — .NET / C# / ASP.NET / Node.js / REST API. ➡ Frontend — React / Angular / Next.js / TypeScript. ➡ UX/UI design — Figma / Photoshop / Illustrator. ➡ Payment gates — Stripe / PayPal / Vantiv / etc. ➡ Integrations — Intuit / QuickBooks / Xero / OpenAI / SendGrid / Postmark. 𝗖𝗼𝗻𝘁𝗮𝗰𝘁 𝗺𝗲 𝘁𝗼 𝘀𝘁𝗮𝗿𝘁 𝘆𝗼𝘂𝗿 𝗽𝗿𝗼𝗷𝗲𝗰𝘁 𝗿𝗶𝗴𝗵𝘁 𝗮𝘄𝗮𝘆! - $40/hr $40 hourly
Tetyana S.
- 5.0
- (133 jobs)
Chernivtsi, CHERNIVETS'KA OBLASTSQL
Visual BasicVisual Basic for ApplicationsData ExtractionR ShinyRStudioPDF ConversionSoftware Architecture & DesignPythonMathematicsC++RCMATLABR, RStudio, VBA, C/C++, Python, Matlab/Octave, SQL, C#, VB .net, Data visualization, Data scraping, good knowledge of mathematics. I am certified in Data Science, a 9-course specialization by Johns Hopkins University on Coursera. Specialization Certificate 6Q7MTZM57QSX earned on December 2, 2015 (Courses: Data Science Tools, R programming, Getting and cleaning data, Exploratory data analysis, Reproducible research, Statistical inference, Regression models, Machine learning and Developing data products) Also I am certified in Python for Everybody, a 5-course specialization by University of Michigan on Coursera. Specialization Certificate 43SANGLTJDKS earned on 05/09/2016 (Courses: Python Data Structures, Using Python to Access Web Data, Using Databases with Python, Capstone: Retrieving, Processing, and Visualizing Data with Python). Conduct lectures and laboratory classes in such courses: - Object-oriented programming in C++; - Automata theory and formal languages; - VBA and VB .NET. - $120/hr $120 hourly
Ankit H.
- 4.9
- (39 jobs)
Gurgaon, HARYANASQL
Design-to-CodeNode.jsRedisElasticsearchAWS DevelopmentAWS ApplicationNeo4jDatabase ArchitectureMongoDB(A) Education: Alumnus of IIT Kanpur with a specialization in Software Development. (B) Experience: Over 10+ years in the software development industry. (C) Technical Expertise: * Proficient in scalable backend architecture and micro-services. * Skilled in Node.js, TypeScript, Nest.js. * Adept with databases and caching: Elasticsearch, Redis, Firebase, Neo4j, MySQL, Postgres, MongoDB. * Experienced in GraphQL, Sockets, webRTC, rabbitMQ, and various bot technologies. * Knowledgeable in APIs: Facebook Graph, Akamai, Twilio, NLP, Rosette. (D) AWS Mastery: * Comprehensive understanding of OpenSearch, ElastiCache, RDS, Neptune, S3, Lambda, and more. * Proficient in AWS AI services: Comprehend, Rekognition. * Familiar with AWS communication services: SQS, SES. (E) Google Cloud Expertise: * Proficient in Firestore, Cloud Functions, and related services. (F) Specializations: * Expertise in crafting recommendation engines using deep learning. * Mastery over marketing APIs: Facebook, Google AdWords, Twitter, Dropbox. (G) ML/AI Expertise: * Experience with LLM, openAI, lLama, Vector Database, LangChain. * Proficient in tools and libraries like Huggingface. (H) Current Tech: Well-versed with the latest technologies, SDKs, and libraries. (I) Leadership: Demonstrated capability in scalable software architecture with a proven track record of leading projects to completion. (J) Unique Strength: A harmonious blend of product insight and technical expertise. - $35/hr $35 hourly
Alina D.
- 4.9
- (4 jobs)
Rosh Ha'Ayin, MSQL
StatisticsMarket ResearchData MiningPresentationsData AnalysisAnalyst with deep working experience in Marketing and Logistics. Highly skilled in building dashboards and reports which are intended to ensure company be aware and understand of key business metrics and point of growth. Skilled in Econometrics, SQL, Microsoft Excel, Statistics and Math Modeling of Economic Processes. What you can expect working with me: • High standards of work (according to your needs) • Punctuality and meeting deadlines with a great results • Creativity and resourceful non-standard thinking • Quick response to your messages • I'm very results oriented and motivated by challenging projects Skills & Experience: • Data mining • Collecting, storing, unifying data from multiple sources • Analysis of data • Building and maintaining reports, dashboards and metrics • Creating of visual implementation of analytics to answer business inquiries • Conduction of market research and analysis on the base of business inquiries • Presentation data in user-friendly format Feel free to contact me. I will help you to discover new opportunities for business on base of your data! Let's work together! - $35/hr $35 hourly
Christopher H.
- 5.0
- (56 jobs)
Larnaca, LARNAKASQL
Data MigrationMicrosoft ExcelGoogle Apps ScriptSpreadsheet SoftwareMaximo Asset ManagementGoogle SheetsMicrosoft Access ProgrammingOracle PLSQLVisual Basic for ApplicationsIT specialist with over 15 years’ contracting experience working with databases and data (analysis, extraction, manipulation and migration). Key Skills – - MS Access - MS Excel - VBA - Google sheets - Oracle SQL and PL/SQL - Data Migration - Electronic Data Clean-up - Maximo, Asset Management (CMMS, Oil and Gas). What can I help you with – Excel – =============== I have been using Excel since office 97 so I have extensive experience in working with: - Formulas – Look-ups, String manipulation, calculations and array formulas and many more - VBA – Forms, Data Manipulation, Data Clean-up and moving/copying data - Other – Pivot Tables, Graphs, Formatting and standardizing appearance MS Access – =============== Like Excel I have been using Access since office 97 I have created many tools and applications in Access over the years from utilities for data clean up to customer booking systems and asset tracking systems. Some the the experience I have is: - Tables - Creation and assigning data types, Keys and relationships - Queries - Select, Union, Update, Append, pass-through (for external DBs) and more complex Queries involving subqueries. - Forms – I have created various combinations of forms/sub-forms utilising most of the main controls as well as many more obscure controls. - Reports – Experience in creating many types of reports from basic cross-tab reports to more complicated reports to pivot data to creating standardised documents such as Purchase Orders or Material receipt reports. Oracle database – =============== I have over 12 years’ experience working with Oracle versions 8 to 11 in a professional capacity and version 12 running on a VM for personal projects. Brief summary: - SQL – DDL to create and modify tables, indexes and constraints and DML to select, insert, update and delete data. I also have experience with SQL optimisation (analysing explain plans etc.). - PL/SQL –Script writing, creating functions/packages and creating/modifying database triggers I also have a basic understanding of Oracle DB administration, but I would call myself competent rather than an expert. Other – =============== Maximo – I have over 12 years’ experience working with Maximo asset management versions 4, 6 & 7 (mostly 4). Python – I have used Python for scripting as it is a powerful language for data manipulation and in some cases Python + Pandas is much more powerful than VBA for manipulating Excel data. I have also done some scripting with Python and SQLite. NinjaScript – I have in recent years been doing some stock trading, because of this I have written several indicators and simple trading strategies for NinjaTrader 8 using Ninjascript (which is basically c#) - $45/hr $45 hourly
Igor T.
- 5.0
- (34 jobs)
Lviv, LVIV OBLASTSQL
Web Application DevelopmentMERN StackMicrosoft Power BI Data VisualizationReact NativeFigmaMicrosoft AzureASP.NET CoreASP.NETC#Node.jsAngular.NET FrameworkReactJavaScriptHi there 👋, I've been working as a .NET software developer for more than 10 years, gained experience building different enterprise solutions based on .NET technologies. Most of the projects I was working on were web oriented with asp.net usage. For a couple of recent years, I've been actively making use of Microsoft Azure as a cloud computing service for building apps. 🚀 Whatever your needs, I deliver on time, on budget, and exceeding your expectations. Invite me now! - $80/hr $80 hourly
Siddharth G.
- 5.0
- (21 jobs)
New Delhi, DLSQL
ETLCritical Thinking SkillsProblem SolvingFunnel TestingMarketing AnalyticsMicrosoft Power BITableauMachine LearningDashboardData AnalysisPythonData VisualizationHypothesis Testing🌟 Worked with World Bank and an Asian Govt on Machine Learning (Water predictions) 🌟 5 Star Client Feedback on all Analytics projects 🌟 1,600+ hours booked on Upwork 🌟 9+ years of global experience with Fortune 500 companies AND fast growing startups 🌟 Skills appreciated: Asking the right questions, attention to detail, clear communication, thoughtful, having a solid work ethic and being a wild optimist Hi, from India! I am a top 3% Upwork consultant for Analytics, Visualizations, and Machine Learning projects, with experience building end-to-end analytics processes for businesses. Industries I have experience in: - Technology - Manufacturing - Automobile - AgriTech - Advertising / Marketing - Real Estate - Finance Skills: - Automate reporting - Create analytics dashboards and UI using Python (Plotly, Dash, Voila, Anvil), Tableau, Power BI, and AWS QuickSight - Create data mining/scraping scripts - Solve business problems using machine learning models: linear/logistic regression, classification, time-series, random forest, xgboost, neural networks, etc - Mentor for data analytics and machine learning tools and mindset Databases: - Google Cloud - AWS S3 and Athena - MySQL - Postgres - Oracle - MongoDB Analytics Engineering: - Looker Database Skills: - ETL - Database Design Programming languages: - SQL - Python - R - HTML - CSS - JavaScript Cloud Services: - AWS - Google Cloud - Azure Visualization Tools: - AWS Quicksight - Power BI - Looker - Tableau - Google Data Studio Clients I've worked with: - Microsoft - Thomson Reuters, now called Refinitiv - General Motors - Coles Australia - World Bank and an Asian Government - GSMA (For annual MWC events: Barcelona, LA and Shanghai) - Startups and SMEs based out of US, UK, South Africa, Australia, Mongolia, and India I have experience looking at data from the perspective of a developer, an analyst, and a decision-maker. Feel free to contact me, and I'll be thrilled to add value to your project. - $61/hr $61 hourly
Philipp L.
- 5.0
- (8 jobs)
Saarbruecken, SLSQL
Axure RPDesign TheoryMarketingUX & UIFigmaFlutterCinematographyAdobe InDesignVideo EditingWeb DevelopmentDartJavaScriptJavaPHPHey, it's me Philipp 👋 (and new to upwork) I am part of a small agency with expertise in software development, UX design, and marketing. As a German-based software developer and UX designer, my strengths lie in truly listening to your needs and turning your projects into reality. I ensure your software is robust, modular, scalable, and easy to maintain. I’m also proficient in marketing and branding, helping to tie everything together through PR, print media, and online marketing activities. My Expertise 🧑💻 Software Development 🎨 Brand Identity Creation 🌐 Websites 🖌️ Illustrations 🐲 UX Design 🎯 Tailored Solutions for You - - - - - - What I Offer - - - - - - ➤ I’ll dive deep into your project needs and goals to ensure top-notch results. ➤ My team will deliver world-class designs based on your vision. ➤ Count on me for a quick turnaround. ➤ Enjoy unlimited revisions until you’re completely satisfied. ➤ My 8+ years of experience and 100% positive feedback guarantee exceptional work - - - - - - You should hire me if you value - - - - - - ➤ Cost-effective design services for every budget. ➤ Designs that boost sales. ➤ I listen to your needs and provide the best guidance. ➤ Trustworthy, honest, and always accessible. ➤ Highly skilled with two diplomas in IT and Marketing from Germany. ➤ GDPR compliant. I'm flexible with my working hours and pretty much always within reach during a project! I look forward to hearing from you and getting things done! Best regards from germany, Philipp - $275/hr $275 hourly
Micah L.
- 5.0
- (40 jobs)
Encinitas, CASQL
RedisSQLAlchemyPython AsyncioJavaScriptPostgreSQLSlackBot DevelopmentEnterprise ArchitectureEnterprise Resource PlanningEnterprise Software DevelopmentEnterprise SoftwareSoftware ArchitectureTypeScriptReactApplication IntegrationSoftware Architecture & DesignSoftware ConsultationCeleryDjangoPythonPerformance OptimizationEnterprise Software Architect and Fractional CTO passionate about solving intricate problems and skillfully mastering complex technical challenges. Creative thinker innovating digital tools, building blocks, and abstractions that segue into powerful, connected, and elegant systems. Expert at solving multifaceted, robust technical difficulties while maintaining a friendly, responsive, and business-oriented approach to projects. Understands both the full technical scope and business-side of obstacles with a knack for big-picture problem solving. Expert-Vetted on UpWork and Top Rated Plus with a 100% Job Success Score. - $50/hr $50 hourly
Haley D.
- 5.0
- (5 jobs)
Kirkland, WASQL
FacebookCustomer Relationship ManagementGoogle DocsPhotographyZendeskPowerPoint PresentationLogistics CoordinationFilm ProductionFull ProductionRFP WritingBudget PlanningCross Functional Team LeadershipMarketing StrategyVideo Editing & ProductionMicrosoft OutlookGoogle SurveysSmartsheetMicrosoft TeamsAmbitious, team-spirited leader with 8+ years’ experience delivering operational, product, and sales results for start-up/major retail brands. Specialization in pitch decks and powerpoint slide deck creation. Scrappy go-getter with proven ability to navigate ambiguous, fast-paced environments while creating robust partnerships, translating insights into actionable solutions, and driving complex priorities to goal. - $40/hr $40 hourly
Boris S.
- 5.0
- (3 jobs)
Moscow, MOWSQL
UnixComputer NetworkBashMicroserviceDockerNGINXGolangRedisKubernetesIf you need a high-quality microservice on Golang - I'm the best fit. Passionate about IT and new technologies. Can solve complex tasks with unclear requirements. Advanced UNIX user. Constant self-learner who is on the cutting edge of technology. Experienced in all phases of the software development cycle (requirements gathering, architecture/design, development, testing and QA, production support, continuous product improvement). - $35/hr $35 hourly
Diego M.
- 5.0
- (26 jobs)
La Plata, BUENOS AIRES PROVINCESQL
SymfonyVue.jsAngularStored Procedure DevelopmentWeb Services DevelopmentAPI DevelopmentSQL ProgrammingLaravelPostgreSQLCSSJavaScriptHTMLPHPAbout Me: I'm a professional application developer based in Argentina, and I'm a native Spanish speaker with over a decade of experience in software development. I hold a degree in Computer Analysis from the National University of La Plata in Argentina. Currently, I work as a dedicated professional for a university, where I'm also a faculty member at the Informatics college, bringing more than 10 years of teaching experience to the table. Technical Expertise: My expertise spans various domains of web development, with a strong foundation in both frontend and backend technologies. I'm well-versed in the following key areas: Frontend Development: Proficient in Vue.js and other modern frontend technologies, ensuring engaging and responsive user interfaces. Backend Development: Skilled in using PHP frameworks such as Laravel, Symfony, CodeIgniter, and CakePHP to build robust backend systems. Experienced in customizing and deploying popular web platforms like WordPress, Joomla, and Moodle. Version Control & CI/CD: Proficient in Git and GitLab, enabling collaborative development and efficient code management. Skilled in creating and implementing CI/CD procedures for automated testing and deployment, ensuring code quality and reliability. API Development: Extensive experience in developing APIs, including RESTful and GraphQL APIs, to facilitate data exchange between applications. Proficient in working with chat-GPT's API and integrating AI-powered features into applications. Database Expertise: Proficient in database design and modeling, with the ability to create efficient database structures. Skilled in crafting custom SQL queries and stored procedures for data analysis, reporting, and statistics. Experience: Throughout my career, I've successfully delivered over 50 custom web applications, ranging from complex systems to user-friendly websites. My experience extends to working on high-demand systems that demand immediate response times in case of issues, thanks to my current position at the university. Why Choose Me: When you hire me, you're not just getting a developer; you're getting a seasoned professional with a deep understanding of both the technical and academic aspects of software development. I'm dedicated to delivering high-quality solutions that meet your project's requirements and deadlines. Let's Collaborate: I'm excited about the opportunity to work with you and bring your ideas to life. Whether you need a web application, API development, database optimization, or any other software-related project, I'm here to help you achieve your goals. Feel free to reach out, and let's discuss how I can contribute to the success of your project. - $150/hr $150 hourly
Thomas T.
- 5.0
- (12 jobs)
Los Angeles, CASQL
Data ManagementBusiness IntelligenceAPI DevelopmentAmazon RedshiftAmazon Web ServicesMongoDBData WarehousingETLNode.jsDockerApache SparkAWS GlueApache AirflowPythonI am a professional cloud architect, data engineer, and software developer with 18 years of solid work experience. I deliver solutions using a variety of technologies, selected based on the best fit for the task. I have experience aiding startups, offering consulting services to small and medium-sized businesses, as well as experience working on large enterprise initiatives. I am an Amazon Web Services (AWS) Certified Solutions Architect. I have expertise in data engineering and data warehouse architecture as well. I am well versed in cloud-native ETL schemes/scenarios from various source systems (SQL, NoSQL, files, streams, and web scraping). I use Infrastructure as Code tools (IaC) and am well versed in writing continuous integration/delivery (CICD) processes. Equally important are my communication skills and ability to interface with business executives, end users, and technical personnel. I strive to deliver elegant, performant solutions that provide value to my stakeholders in a "sane," supportable way. I have bachelor's degrees in Information Systems and Economics as well as a Master of Science degree in Information Management. I recently helped a client architect, develop, and grow a cloud-based advertising attribution system into a multi-million $ profit center for their company. The engagement lasted two years, in which I designed the platform from inception, conceived/deployed new capabilities, led client onboardings, and a team to run the product. The project started from loosely defined requirements, and I transformed it into a critical component of my client's business. - $35/hr $35 hourly
Ndifon D.
- 4.5
- (9 jobs)
Douala, LTSQL
DockerGolangPostgreSQLPHPNext.jsLaravelTypeScriptLinuxGraphQLNode.jsHello, my name is Desmond and I am a Web/DevOps Engineer with over 5 years of experience designing, building, and maintaining APIs. I am committed to delivering near-perfect products, and I have a perfect track record of successful delivery to date. My skillset includes the following: Backend: - PHP (OOP, Laravel) - GraphQL, Apollo - Go - Ruby (Rails) - NodeJs (AdonisJS, NextJs, Express) - Typescript Testing: phpunit, pestphp, Morcha Frontend: - Javascript - ReactJs, VueJs, NuxtJs, InertiaJs - HTML/CSS3/SASS/Less - Testing: morcha, cypress Databases: MySQL, PostgreSQL, MongoDB, Redis Architecture/Servers: Nginx/Apache, Docker, Digital Ocean, AWS, Heroku You may view my portfolio at malico.me. Thank you for considering my services. - $44/hr $44 hourly
Iurie O.
- 5.0
- (69 jobs)
Timisoara, TMSQL
Looker StudioGrowth AnalyticsFacebook DevelopmentData VisualizationGoogle AnalyticsGoogle Tag ManagerPixel Setup & OptimizationA business without data will always fail. In this aglomerated world of business, you need to adapt very fast and be able to make the right decisions in order to satisfy customers and improve your business' performance. A proven successful way to gain this is to collect information about your customers. And here is where I come with my invaluable tools to help you. I will set up and integrate Google Analytics, Google Tag Manager, and Facebook Pixel with your website, once we get this done, we can get basic information about your client, location, what device is using, how he/she arrived in your website, and other simple data. Now, this isn't enough. Once we do the integration, we want to track what our customer is doing. We will track button clicks, outbound links, form submission, scroll depth, etc. But the most efficient insights we will get from setting and tracking funnels, checkout behavior, shopping behavior, and most important transactions because this is what drives the business forward. Don't hesitate, contact me, and let's improve your business. - $100/hr $100 hourly
Yuriy D.
- 4.9
- (13 jobs)
Batumi, AJSQL
.NET CoreDevOpsElasticsearchRabbitMQClean ArchitectureApache KafkaKubernetesAzure DevOpsDockerRESTful APIEntity FrameworkASP.NET CoreMicrosoft SQL ServerPostgreSQLC#GitASP.NETAs an accomplished Software Engineer proficient in Microservices, Solution Architecture, Test Driven Development, and Cloud Deployment, I offer expertise in developing scalable solutions and integrating diverse systems. With a strong foundation in software engineering and experience utilizing various technologies, I am well-equipped to contribute value to a wide range of projects spanning across industries. Skills: • Fluent English • Distributed & scalable high-load solutions • Microservice Architecture, Clean Architecture • Test Driven Development, Domain Driven Design • SQL | SqlServer, MySql, PostgreSQL | EF Core • NoSQL | CosmosDB, MongoDB, Elasticsearch • OpenTelemetry, APM, AppInsights, ELK, Jaeger • RabbitMQ, Azure Service Bus, MassTransit • CI/CD, Docker, Kubernetes, Azure Achievements: • Maintainer of various open-source nuget packages • Implemented numerous high-load microservice solutions utilizing interservice messaging brokers, currently operational • Multiple successful OCPI implementations, including integration with external parties - both as a CPO and an eMSP. Maintainer of the "OCPI.Net" nuget package. Should you seek a proficient .NET developer well-versed in Test-Driven Development (TDD), Domain-Driven Design (DDD), OCPI, OCPP, and proficient in C#, with proven experience in team leadership and utilizing Scrum methodologies, who can play a role of a Team Lead or a Solution Architect, or a Senior Software Engineer experienced particularly within the Electric Vehicle (EV) Charging sector, I invite you to reach out for further details. - $60/hr $60 hourly
Zoran M.
- 5.0
- (11 jobs)
Mojkovac, MOJKOVACSQL
Unit TestingDatabase OptimizationPostgreSQL ProgrammingQuery TuningPerformance OptimizationTwigBootstrapSymfonyPostgreSQLCSS 3JavaScriptTypeScriptPHPjQuery6 - 8 years of experience ➡ Symfony & PHP ➡ JavaScript & TypeScript ➡ PostgreSQL What my clients get: ✅ project status daily updates ( done, doing, next steps) ✅ friendly communication, clear expectations and deadlines (+ quick response rate) ✅ proactive approach in solving problems ✅ "can do" attitude but also honest, friendly note when something is out of my expertise I can help you if you need: ➡ modern well-coded website (Web store, Portfolio..) or ➡ custom web app ➡ DB & SQL query optimization Other skills & technologies: ➡ Bootstrap, HTML, CSS, Twig ➡ jQuery ➡ Laravel ➡ MySql ➡ algorithms & data structures Experience working in a 🌍 remote team: ✅ 15+ months and still ✅ tickets in jira (kanban) ✅ communication: slack + videos (obs screen record) ✅ code reviews ✅ writing tests ✅ jenkins CI/CD Note: more info in Upwork job below 🔎 Check my 1500+ products Web store project "Rubicon Shop 🏴" below in portfolio ⬇ 💼 Have a project for me? Contact me, and I would gladly have a look :) Want to browse more talent?
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