Hire the best Backend Rest API professionals

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  • $85 hourly
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    vsuc_fltilesrefresh_TrophyIcon Backend Rest API
    API
    RESTful API
    Front-End Development
    OpenGL
    Rust
    Django
    Microsoft Windows
    JavaScript
    C++
    Python
    Qt Framework
    C
    Electron
  • $125 hourly
    FHIR certified. Mirth Certified. Jitterbit. 16 years building complex HL7, FHIR API, csv, flat file healthcare interfaces. Standard services include: - affordable price to setup your Epic and Cerner dev code accounts and build necessary FHIR api calls as an automated Postman collection including the Oauth requirements( this gives your team a jump on healthcare deep integration) - setup an efficient process for you to convert or map csv, HL7, or database fields to FHIR resources and then deliver to Azure, AWS, GCP, sftp, REST or any application - setup process so you can convert incoming FHIR resources to any data format for your application to ingest. - HL7 v2 integration of all types including: ADT, VXU (vaccine), ORU(imaging or lab), ORM(imaging and lab orders), SIU(scheduling), DFT(charges), MDM(docs), RDE(medications) and many other types of HL7.
    vsuc_fltilesrefresh_TrophyIcon Backend Rest API
    FHIR
    Mirth Connect
    Healthcare Interoperability
    Health Level 7
    API Integration
    RESTful API
    SQL
    Web Service
  • $38 hourly
    Implementing your idea into a product that can be accessed in every browser. Intuitive, easy to use, and responsive, optimized for every device. A web application is what I can build for you to increase your business. What can I do for you? - Convert your idea into a Product that can increase your business - Create and deliver web applications from scratch - Fix bugs and optimize your existing project to make it run faster - Add new features on application you already have My top skills: - Angular - JavaScript / ES6 / TypeScript - RxJS, NgRx, NgBootstrap, Angular Material - RESTful API - NodeJS - ExpressJS - PostgreSQL - HTML5 / CSS3 / SCSS / SASS - GitHub, BitBucket, GitLab I'm looking for clients that seeks quality over quick-and-dirty solutions. Feel free to contact me! Best regards!
    vsuc_fltilesrefresh_TrophyIcon Backend Rest API
    API
    RESTful API
    Web Development
    SQL
    CSS 3
    HTML5
    Node.js
    JavaScript
    TypeScript
    MongoDB
    Angular
  • $65 hourly
    I provide major tech companies, including FORTUNE 500, such as Microsoft, Upwork Internal Team, GE, and Fujitsu, with high-quality technical content that fits their business goals. My background is in electrical engineering and cybersecurity. I've written many API and SDK documentation. I hold Certified Information Security Manager (CISM), ITIL, Project Management Professional (PMP) certification, and two master's degrees in electrical engineering and engineering management. I am proficient in JSON, YAML, REST APIs, HTML, and C. Examples of tools used: Confluence, Markdown, Zendesk Guide, Swagger IO, Git, Readme, Stoplight, etc
    vsuc_fltilesrefresh_TrophyIcon Backend Rest API
    API Documentation
    Technical Writing
    OpenAPI
    Academic Writing
    SEO Writing
    YAML
    RESTful API
    Blockchain
    ICO White Paper
    GraphQL
    Writing
    API
    Research Papers
    Content Writing
  • $75 hourly
    I am an experienced professional with 5+ years of team management, operations management, and process development experience. Recognized for demonstrating a natural aptitude for administering all day-to-day operations to allow for maximum company success, as well as for evaluating and enhancing company processes and effectively operating across a wide variety of other areas such as sales, programming, and accounting, I have a history of contributing to company growth throughout my career. Professional focal points include operations strategic planning, P&L ownership, document management, programming, sales development, accounting management, financial analysis, audit management, software development, and project management. Delivering superior administration on the latter areas of expertise requires utilization of effective communication skills, negotiation skills, as well as business acumen, operations analysis, issue resolution, recruitment management, integration management, and product management to support efficiency and maximum returns. Recently, I was the Chief of Staff with Atlas Lane. Under my leadership, I monitored and directed all day-to-day operations of the business and a team of 20 employees. I also developed and documented company processes and conducted and completed all company and client accounting. In addition, I liaised with senior leadership and various other personnel and teams to ensure the company’s operational support structure was driving the business forward with minimal expenditures.
    vsuc_fltilesrefresh_TrophyIcon Backend Rest API
    RESTful API
    Stripe
    Heroku
    Django
    Minimum Viable Product
    PostgreSQL
    Python
    JavaScript
    HTML5
    Docker
    jQuery
    Bootstrap
    CSS 3
  • $18 hourly
    You are trying to change the world with your business. So am I. I don't sell you my programming skills, I achieve your business goals. I love to be on the edge of technology, learning new stuff and playing around with it. BUT I always try to achieve the goal in the most quick and easy way. This is what really matters. Not forgetting about the project's architecture of course. It must be flexible and maintainable. My Expertise:- * Proficient with core Python and its libraries * Great understanding of Web Frameworks such as Django, Flask * Extensive knowledge of React JS, Redux, Redux Saga * Efficient with API Integration * Multiple computer language abilities, C++, Python, HTML, Java, CSS, JavaScript * Highly worked with SQL and NoSQL databases * Strong communication skills So I am seeking opportunities to build applications to show my expertise and delivering the product in-time. You will get perfect end result of work on time and you will be satisfied with the end product with "Quality Work"! Feel free to contact me anytime. Cheers,
    vsuc_fltilesrefresh_TrophyIcon Backend Rest API
    Redux Saga
    RESTful API
    Redux
    Python
    Node.js
    Flask
    React
    MongoDB
    MySQL
    Django
    Amazon Web Services
    webpack
  • $30 hourly
    Passionate programmer, ever hungry to learn and earn. I have a CAN DO attitude and i am a dedicated learner. EXPERIENCE : 8 Years Backend Skills : * Java * Grails * Node * Groovy * Spring * Hibernate * AWS Frontend Skills : * Javascript * React * Redux * AngularJs * HighCharts * Html * Sass, Less Databases : * Mysql * Mongo * Elastic Search * Snowflake
    vsuc_fltilesrefresh_TrophyIcon Backend Rest API
    Agile Software Development
    Elasticsearch
    RESTful API
    Software Architecture & Design
    Web Development
    React
    AngularJS
    Grails
    JavaScript
    Java
    HTML5
    MongoDB
    Spring Framework
    AJAX
  • $35 hourly
    As an experienced Python Django developer, I have built numerous web applications that are scalable, secure, and user-friendly. I have a strong understanding of Django's Model-View-Controller (MVC) architecture and have worked on all aspects of the development process, including requirements gathering, database design, front-end development, and deployment. My expertise includes developing REST APIs, integrating third-party libraries and APIs, and working with various front-end frameworks such as React, Angular, and Vue.js. I am also well-versed in web technologies such as HTML, CSS, and JavaScript, which allows me to create responsive and engaging user interfaces. I have worked with clients across various industries, including e-commerce, healthcare, and education, and have delivered solutions that meet their unique business needs. I am committed to delivering high-quality work and ensuring that my clients are satisfied with the end product. If you're looking for a skilled Python Django developer who can help you bring your ideas to life, look no further. Let's discuss your project and see how I can help you achieve your goals. Python, Django, Angular, React, Vue, Typescript, HTML, CSS, SASS, LESS, Bootstrap, Javascript, Jquery, Nginx, UWSGI, ASGI, Restful API, Django Rest Framework, AWS, EC2, Digitalocean, Docker, GIT, Scrapy
    vsuc_fltilesrefresh_TrophyIcon Backend Rest API
    Ubuntu
    Angular 10
    RESTful API
    NGINX
    AngularJS
    Django
    HTML
    JavaScript
    Python
    TypeScript
    React
    CSS
    RESTful Architecture
    Responsive Design
  • $80 hourly
    My name is Sergey Karpov, I'm a practicing software developer based in Westchester, NY. I am a US citizen, originally from Latvia. Professional software developer, system builder and solution architect, with more than twenty years of experience, accumulated while working for the top tier banks and hedge funds in the Greater New York area. It would be fair to say that I know the software development business inside-out. For the past 10-plus years I have been mastering the architecture and implementation solutions for solid object-oriented design, distributed computing, the most advanced design patterns, code implementation and comprehensive system testing. My name can be found among the signatories of the Agile Manifesto, somewhere in the year 2011. Always follow the best practices when it comes to solid design and clean bullet-proof coding. • Expert in Object-oriented design, C#, C++, .Net Framework, .Net (Core) 6 to 8 • ASP.Net Core, REST Web API, Blazor Server & Wasm, React, Angular /RxJs, WPF, Winforms • SQL, ADO.Net, Dapper, EF.Core, Messaging, Distributed Computing • Azure Web Apps, SaaS, Service Bus, Microservice Fabric, Telemetry, Blob, Vault, stc. • GIT, Agile methodologies, Unit and E2E Testing, SDLC, etc. I’m equally at home with green-field architecture and design projects, working with legacy code, code-base conversions, performance optimization, code quality analysis and improvement, and multiple other scenarios.
    vsuc_fltilesrefresh_TrophyIcon Backend Rest API
    Solution Architecture
    Messaging Framework
    Testing Framework
    Serverless Computing
    Azure Service Fabric
    .NET Stack
    Agile Software Development
    Azure App Service
    ASP.NET Web API
    Angular
    Blazor
    C#
    SQL
    ASP.NET Core
    RESTful API
  • $55 hourly
    Experienced Information Technology professional with 10 years demonstrated history of working in the apparel and fashion industry as well as public sector in different capacities. Skilled in Project Planning & implementation, Team Management, Retail Pro, Sage 300 EPR, Sage 50, SQL Databases and .Net programming. Experienced in : SAGE 300 ERP, Sage 50, Sage 100, Retail Pro (Prism & v9), SAP (FI, HCM, MM, SD), Visual Studio (.net & vb6), Microsoft SQL Server with Reporting Services – SSRS Reports & Dashboards, Crystal Reports
    vsuc_fltilesrefresh_TrophyIcon Backend Rest API
    SAP Crystal Reports
    Automation
    .NET Framework
    Sage
    Software Integration
    Data Migration
    RESTful API
    Data Extraction
    Ecommerce Website Development
    Sage Intacct
    ERP Software
    Web Development
    C#
    API
  • $60 hourly
    Hello there! i am a passionate Computer Engineer with 7+ years extensive experience in Mobile App development. I currently earned the Upwork "Top Rated Plus" badge with 100% job success score. This exceptional rating guarantees your complete satisfaction as a client. I have taken charge of various responsibilities, encompassing end-to-end development of mobile applications, diligent maintenance and releases to PlayStore/AppStore, creation of apps tailored for internal company use, and the building, maintenance, and deployment of SDKs. - Mobile App Development Tools: Figma, Visual Studio (React Native + Flutter SDK), Android Studio (Main development environment, Android SDK, Flutter SDK), Firebase (real-time database/Authentication/Storage/crashlytics, etc.), Python (for machine learning development/TensorFlow model construction), TensorFlow (Machine Learning Model training), OpenCV (Image Processing ), Neural networks (Knime), Hilt, Retrofit, Redux, Mobx, Reactotron. - Project Management and Collaboration Tools: JIRA, Slack, Agile Methodology, Scrum, Kanban Board. - Version Control Systems: Gitlab, Github, BitBucket, Azure DevOps - Continuous Integration and Delivery (CI/CD) Tools: CircleCI, BitRise - API Testing and Documentation: Postman, Swagger - Plus Mutliple Other Tools/Platforms : Jitpack (Library publishing), Stripe (payment gateway), etc.. Throughout my time on Upwork, I have collaborated with numerous international companies and startups, including distinguished companies owned by NEXT1000 individuals featured by Forbes. Individually, i have competed nationally with my IoT app and got enlisted in 2019 first 10 competitors in transportation technology competition "Teknofest"in Turkey . My computer engineering degree only adds to the endless possibilities of the apps that can be developed, such us your amazing app idea! Please check my Upwork profile to see details about every project i made, as i always make sure to develop exactly what clients want.
    vsuc_fltilesrefresh_TrophyIcon Backend Rest API
    Bluetooth LE
    Kali Linux
    Mobile App Design
    Industrial Internet of Things
    RESTful API
    Image Processing
    Android Studio
    Firebase
    Android
    Android App Development
    JavaScript
    Kotlin
    iBeacon
    Python
    Java
  • $85 hourly
    ⚡️Helping your business save time on repetitive tasks.🤖 "Ryan has provided our company with integration between our HR and Payroll systems. The process was seamlessly executed and has delivered reliable performance. I highly recommend Ryan and his team as they were really dedicated and professional throughout the whole process." - Magda L. | Bailey Nelson 🌟 WHY CHOOSE ME OVER OTHER FREELANCERS? 🌟 ✅ Business Focused w/ Technical Background: I can advise you on what technologies/apps make the most sense for YOUR project from a business and technical standpoint ✅ Client Focused: I focus on providing value to all of my Clients and Earning their trust. Earning your Review and Feedback is immensely important to me. ✅ Over-Delivery: This is core to my work as a Freelancer. My focus is on giving more than what I expect to RECEIVE. ✅ Responsiveness: Being extremely responsive and keeping all lines of communication readily open with my Clients. ✅ Intelligent & Quick Learner: I have a BSc. Mechanical Engineering from the University of Alberta and pride myself on quickly understanding clients’ businesses and requirements. "It was a pleasure working with Ryan and his team, they are clearly automation experts. We needed a pretty comprehensive and complex automation, and they accommodated all of our requests quickly and accurately, and provided suggestions for improvements along the way. We ended up working on several projects together and all of them were completed exceptionally. We highly recommend IOA Digital and plan on working with them in the future." -Mason F. | LiveSchool 🌟 Digital Toolbelt:🌟 -API Automation Platforms: Make.com (formerly Integromat), Zapier, Paragon, n8n -100s Applications Integrated: HubSpot, SalesForce, NetSuite, ADP, Shopify, AirTable, Google Apps, Trello, Asana, Etsy, eBay, and many many more... 💯 I thoroughly enjoy learning new industries and taking on new challenges. 🙋Please reach out to hear how I can help your business save time!
    vsuc_fltilesrefresh_TrophyIcon Backend Rest API
    RESTful API
    API Development
    JSON
    Automated Workflow
    Zapier
    Automation
    API
    Data Migration
    Business Strategy
    Business Process Automation
    Google APIs
    Make.com
    Marketing Automation
    API Integration
    JavaScript
  • $60 hourly
    I am an experienced full stack data and backend engineer. My background and skills include: - Expert in Python, SQL and NodeJS - Certified AWS Cloud Practitioner and studying for exams in Certified Developer, Solutions Architect, SysOps Administrator and Data Analytics - Two MScs in Mathematics and Data Science - Databases (Postgres, PostGIS, Aurora, DynamoDB, MySQL, Mongo, Redis, Snowflake, Redshift, Neo4j) and ORMs - Cloud Infrastructure (AWS, GCP, Terraform) - APIs (FastAPI, Flask, Express, GraphQL) - Orchestration (Airflow, Kubernetes) - Pub/Sub + Queuing (Kafka, RabbitMQ) - Version control Git - CI/CD (Docker, Github Actions, Jenkins) - GIS (Postgis, Shapely, GDAL, H3) - Web crawling (Scrapy, custom crawlers in Python/Node/Go) - PySpark/AWS EMR/AWS Batch I have worked in data and tech for 4 years including full time roles as a Data Scientist, Data Engineer, Backend Engineer and Head of Data. In a previous life I worked investment banking in Sales and Trading for 4 years. Previous projects include: - Designing and building a client a booking engine to allow them to expand into the reservation and beauty treatment business (GCP, Python, Postgres, Redis and FastAPI). - Assisted a bottling company in expanding their tech capabilities by moving them from spreadsheets into the cloud and developing APIs to automate their business with other partners (Python, Postgres, AWS, FastAPI). - Refactored an employers crawling system to make it more efficient. Previously each data entity was crawled on a regular frequency, but the vast majority of entities very rarely changed leading to unnecessary crawling and resource use. The refactor took into account the changes in the data and how often they occurred to predict the next optimal time to crawl resulting in a 15% reduction in cloud costs (AWS, Postgres, NodeJS, Python, RabbitMQ). - Developed a streaming change data capture pipeline handling 50 million unique payloads per day resulting in a +15% reduction in total cloud costs while allowing live data to be available to customers (AWS, Python, NodeJS, RabbitMQ, Postgres, Snowflake, Airflow) - Created a data architecture to allow aggregation of geospatial time series for any possible geographic polygon across +20bn global data points in sub-second time (AWS, Clickhouse, Python, FastAPI, Postgres, Uber H3, Redis) - Created an autonomous on-demand Excel and PDF reporting system to allow a sales team to generate their own reports from data stores with no required input from developers (AWS, Python) - Developer multiple machine learning models running production including an age/gender classification for faces in photos (Python, Keras, GCP), entity resolution system combining tabular, text and image embeddings to deduplicate +30mm listings across multiple provider platforms (AWS, Python, PyTorch, RabbitMQ, Neo4j, Postgres)
    vsuc_fltilesrefresh_TrophyIcon Backend Rest API
    Amazon Web Services
    Terraform
    RabbitMQ
    Flask
    Machine Learning
    RESTful API
    PostgreSQL
    Node.js
    Snowflake
    PySpark
    Apache Kafka
    Docker
    Apache Airflow
    Python
    SQL
  • $65 hourly
    Hi, I'm a Full Stack Developer. I have experience in React, ReactNative, Angular, Vue, Node and Graphql. I can manage multi-disciplinary projects and solve complex problems. My aim is to develop projects that look beautiful and professional, are highly functional, load quickly and are user-friendly. I have experience working on both small and large codebases and I am able to take over and integrate myself into established projects easily. In addition to being a developer, I am also experienced in project management tools such as Asana, Jira and Trello. WHY CHOOSE ME When choosing me for your next project, you will have the following: ★ A DIVERSE SKILL SET- I am a Full Stack Developer with experience in React, ReactNative, Angular, Vue, Node and Graphql. ★ AN EFFECTIVE TROUBLESHOOTER - I have the ability to manage multi-disciplinary projects and solve complex problems. ★ HIGH-QUALITY PRODUCTS - My aim is to develop projects that look beautiful and professional, are highly functional, load quickly and are user-friendly. ★ ABILITY TO INTEGRATE - I have experience working on both small and large codebases, and I am able to take over and integrate myself into established projects easily. ★ FULL END-TO-END DEVELOPMENT - I have experience working on projects from the initial planning stages through to completion of development. ★ PROJECT MANAGEMENT - In addition to being a developer, I am also experienced in project management tools such as Asana, Jira and Trello. As well as being a developer, I am also a trainer and salesperson. MY FULL LIST OF SKILLS ⚒ ReactJs, redux, webpack, babel and ES6, ES7 ⚒ Angular ⚒ Vue ⚒ React-native ⚒ Node.js, Express.js ⚒ Graphql (Apollo) ⚒ UI Libraries (Semantic, Material, Ant design) ⚒ AWS deployment, Heroku Deployment ⚒ Third-party API's such as OneSignal etc ⚒ Code Management Tools: Github, Bitbucket, Gitlab ⚒ Project Management Tools: Asana, Jira, Trello, Pivotal Tracker
    vsuc_fltilesrefresh_TrophyIcon Backend Rest API
    React Native
    Amazon ECS
    NoSQL Database
    GraphQL
    ExpressJS
    AngularJS
    TypeScript
    API Development
    React
    Vue.js
    RESTful API
    Node.js
  • $45 hourly
    Capable professional with a proven history of enhancing business operations. Proficient in problem-solving skills. Well-coordinated in addressing problems, investigating root causes, and implementing successful resolutions. 16x Salesforce Certifications ✅ Salesforce Certified Platform Developer II ✅ Salesforce Certified Integration Architect ✅ Salesforce Certified Sharing and Visibility Designer ✅ Salesforce Certified Application Architect ✅ Salesforce Certified Data Architecture and Management Designer ✅ Salesforce Certified Platform Developer I ✅ Salesforce Certified Javascript Developer I ✅ Salesforce Certified Advanced Administrator ✅ Salesforce Certified Services Cloud Consultant ✅ Salesforce Certified Sales Cloud Consultant ✅ Salesforce Certified Experience Cloud Consultant ✅ Salesforce Certified User Experience Design ✅ Salesforce Certified Platform App Builder ✅ Salesforce Certified Administrator ✅ Salesforce Certified AI Associate ✅ Salesforce Certified Associate 10 Salesforce SuperBadges: * Advanced Apex Specialist * Apex Specialist * Data Integration Specialist * Lightning Web Components Specialist * Service Cloud Specialist * Process Automation Specialist * Security Specialist * Business Administration Specialist * Lightning Experience Reports & Dashboards Specialist * Aura Components Specialist
    vsuc_fltilesrefresh_TrophyIcon Backend Rest API
    Salesforce Sales Cloud
    Salesforce CRM
    Salesforce Lightning
    Apex
    Salesforce App Development
    Salesforce Service Cloud
    Salesforce
  • $60 hourly
    Are you looking for a developer who specializes in custom Laravel or WordPress solutions? Look no further. With extensive experience in developing complex solutions and API integrations, I'm confident in my ability to deliver high-quality results that exceed your expectations. I specialize in various areas, including: - Complex Laravel and WordPress applications - OpenAI and ChatGPT - REST API - Mobile app backend - Google map API, geolocation by IP, address autocomplete - Complex Woocommerce customization - Any external API services When it comes to coding, I follow modern guidelines and always ensure that my code is clean and scalable. For WordPress projects, I use hooks and filters instead of hardcoding the core to ensure that clients can upgrade WordPress, themes, and plugins without any issues. For Laravel projects, I follow the MVC standard and best practices. Ready to get started? Simply click the green "Invite to Job" button, and we can discuss your project details, questions, or ideas in more detail. With my expertise and experience, I'm confident that I can help you achieve your goals and deliver results that meet your needs. Thank you, and best regards. ===================== Keywords: Laravel, PHP developer, WordPress, Woocommerce, Woocommerce Subscriptions, JS, JavaScript, API, Stripe, PayPal, ACF Pro, Gutenberg, Digital Ocean, Elastic Search, Git, GitHub, Jira, Asana, REST API, Laravel Nova, Laravel Forge, Laravel Jobs, Queues, Websockets, Vue.js, OpenAI, ChatGPT
    vsuc_fltilesrefresh_TrophyIcon Backend Rest API
    Full-Stack Development
    Elasticsearch
    RESTful API
    Web API
    API Development
    Back-End Development
    Front-End Development
    Web Development
    Vue.js
    JavaScript
    WordPress Plugin
    WooCommerce
    WordPress
    Laravel
    PHP
  • $100 hourly
    Senior Software Engineer with +10 years of experience in software development. Designed and developed systems and services starting from system analysis, system design, implementation, and testing phases ending with deployment process. Expert in Ruby on Rails, Java, JavaScript, EmberJS, and C#. Professional experience with RDBM (MySQL, PostgreSQL) and NoSQL (Redis, Mongodb, Dyanmodb). Expert with architecting systems using micro-services, messaging platforms (Kafka, RabbitMQ, Sidekiq). Good experience with cloud services including AWS, Google Cloud, Digital Oceans platforms. Self-motivated and quick learner for new technologies. Strong background in system development life cycle, Agile methodology, algorithms and design patterns. Excellent Interpersonal skills, outstanding problem solving and decision making skills as well as management skills.
    vsuc_fltilesrefresh_TrophyIcon Backend Rest API
    Agile Software Development
    JavaScript
    React
    Apache Kafka
    C#
    SQL
    Ruby on Rails
    Java
    Docker
    RESTful API
  • $55 hourly
    Dreamy, proactive, hardworking, self-taught and with the dream of becoming a polyglot programmer. I have a fascination for learning. I have over 7 years of experience in various areas in Web Development. I worked on projects for customers located in Colombia, Canada, Puerto Rico, Australia and the United States. I worked in this highlight projects: - tecdonor.com platform for volunteers. - oyelomio.com platform for musical talent in Puerto Rico. - vancalab.com Web page of courses for national test in Colombia. APIs I've used: - Mailchimp - Stripe - ePayco - Github - Gmail - Google Maps My skills in Backend: - Laravel - PHP - Rails (Ruby) - Go My skills in Frontend: - Html5 - Css3 - Javascript - Jquery - React - Vue My skills in Databases: - Postgresql - Mysql. My skills in Web servers: - Apache - Nginx My skills in OS Servers: - Ubuntu - Centos I will be happy to work with you
    vsuc_fltilesrefresh_TrophyIcon Backend Rest API
    Symfony
    RESTful API
    Web Application
    API Development
    API
    JavaScript
    Vue.js
    HTML5
    Ruby on Rails
    Ruby
    MySQL
    Laravel
    PHP
  • $45 hourly
    I'm an expert symfony developer (14+ years in symfony framework) with extensive experience in building high quality sites. Having 15 years of experience range from building responsive mobile sites that work well cross-browser to building scalable sites for the industries like Hospitality management with social media integration, Staffing, Financial, Real Estate, Travelling, Mobile recharge, IPTV and ISP recharge, Online Magazine, Online Store, Job Portal and Portal for Online Video etc. I would like to work on projects with a team (or individually) that cares about creating beautiful and usable interfaces. It's important to me to build long term relationships with clients, so I'm primarily looking for long term projects. I am flexible with my working hours and I'm happy to work closely with any existing freelancers you work with. I look forward to hear from you!
    vsuc_fltilesrefresh_TrophyIcon Backend Rest API
    Docker Compose
    PhpStorm
    JavaScript
    Symfony 4
    jQuery
    PostgreSQL Programming
    Doctrine ORM
    MySQL Programming
    RabbitMQ
    Docker
    NGINX
    RESTful API
    PHP
    Symfony
  • $20 hourly
    I have 10+ years of experience in .NET and have following skills. + OOPS and System Design; + Theoretical knowledge and practical experience with design patterns; + .Net framework developing (WPF: MVVM, MVC) + LINQ + Entity Framework up to 6.0.2 (with DB-first, code-first and model-first approaches). Deep knowledge with T4 template modifications, DbContext improvement, performance improvement, SQL profiling and others; + Web developing (ASP.NET and ASP.NET MVC up to 5.1 version); + JavaScript (jQuery, linq.js, toastr); + KendoUI (plain and with ASP.NET wrapper); + HighCharts (with ASP.NET wrapper); + Database architect and optimization including Microsoft SQL/T-SQL; + WCF and WebServices; + XML, XSLT, Serialization\Deserialization (XML, Binary); + T4 templates; + Microsoft Azure; + SVN, GIT and TFS version controls; + Angular 15 + Javascript + Jquery +Web API Expert in building Responsive Web UI, Twitter Bootstrap, Mobile and Tablet Apps, ASP.NET MVC 4 with EF 5.0 Jquery and Windows Azure. Using Knockout JS, Angular JS and Kendo UI I am able to give you such a progressive enhanced responsive solution that works fine on any computers web browser, mobile platforms also including IPAD and other Tablet. Most important part is communication, and I have excellent communication skills and manners, good at English (can discuss, speak through Microphone, or chatting through Instant messenger). We might have different time zone.
    vsuc_fltilesrefresh_TrophyIcon Backend Rest API
    Software Architecture & Design
    Progressive Web App
    RESTful API
    ASP.NET Core
    HTML5
    C#
    jQuery
    ASP.NET MVC
    ASP.NET Web API
    ASP.NET
    JavaScript
    Angular
  • $50 hourly
    I develop web apps and sites using Laravel, Vue, Tailwind. My forte is to take over existing PHP project with legacy, performance issues and chaotic development cycles and put it all in order: resolve issues, implement new features, introduce proper code practices. If you have just an idea, I will help create a project roadmap with clear timeline. I like working closely with product owner, only this way I can deliver what you really need, not in the end of project but starting from day 1. I believe good code is one that is easy to change and maintain. If you want to build: - a Marketplace; - a SaaS; - a membership restricted website for something; - a backend for mobile or web app; - API for something; - anything that is not CMS but a web app; let's talk! I like and prefer asynchronous communication on project. However sometimes it's necessary and I will happy to meet you in Zoom. Seeing your idea be successful is more important to me than getting your business, so if you're not certain whether I can help you, contact me, and I'll help you figure out who can. Recent works: - Backend for app - Top-25 in Food & Drinks on App Store Denmark - Crypto prices monitoring system - Ad server - Multi-level marketing and affiliate program engine - Ride-sharing app for drivers and riders 🇺🇦
    vsuc_fltilesrefresh_TrophyIcon Backend Rest API
    Cryptocurrency
    Database Design
    API Development
    RESTful API
    Database Architecture
    Web Development
    HTML
    JavaScript
    PHP
    MySQL
    Vue.js
    HTML5
    CSS
    SaaS
    Laravel
  • $30 hourly
    I am Muoi Nguyen (Teddy), Top Rated Plus, Senior Developer. Over 6 years of experience, I have been providing the following services: ✅ Web app development ✅ ETL Pipeline ✅ API development and integration ✅ POC and MVP development ✅ Cloud development ✅ Automation and crawling pipeline. Frontend: React JS, Next JS, HTML5/CSS3, SCSS, Bootstrap, Tailwind, JavaScript, jQuery, d3.js. Backend: Python, Django, Flask, Celery, NodeJS, MySQL, Postgres, REST API, Apollo GraphQL, Express, MongoDB, Redis, RabbitMQ. Devops: Kurbenetes, Docker, AWS, GCE, DO, Heztner My advantages: (1) Good planning for the project. (2) Excellent communication skills with clients to make sure requirements are well-achieved. (3) Delivering a well documented and clean code. (4) Use of latest technologies. Why trust me? Quick Turnaround time. 99% Positive reviews. 6+ years of experience in this field No project is too small or too big, and I guarantee you will be satisfied with my work, as are my current repeat clients. Thank you for watching my profile. Some of my clients: Care, ihousedesign, atworkph, vinnytroia, vaartani, godealco, sportskred, ruoomsoftware, monjaco, sternpinball, chartubate, intelligenteye.
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    I specialize in creating highly modular applications that are built to meet minimum viable product requirements while being open to later extension. I also believe that you can move fast without breaking things or accumulating massive technical debt. I have more than a decade of experience in both web development and business automation. I am flexible and comfortable working anywhere in the stack, though I very much shine in backend development. I have experience in: - Producing API driven websites in Node, with strong security requirements. - Building blazing fast, composable low-level applications in Rust. - Bash scripting and automation. - Administrating and provisioning Linux servers, typically through AWS. - Managing databases, including Postgres, Neo4j, MySQL, RethinkDB, CouchDB, and others. - Building inventory systems and integrations between incompatible APIs. - Producing both native Android applications and cross-platform via Cordova. - Managing e-commerce sites and storefronts.
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    Experienced platform administrator/developer with concentration on architecture and enterprise adoption. More than 8 years of ServiceNow experience with a heavy focus on custom application development. Exposure with implementing, configuring and customizing ITSM, CMDB, ITAM, HRSD and many other product offerings. Proficiencies in Advanced Scripting, Service Portal, API integrations and Application design.
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    🌟 Projects delivered with up to a 70% reduction in operational costs. ⏱️ Refactoring that improved performance by 50%. 🥇 Top 3% of Upwork Talent. 🏆 10+ years of Backend Developer experience. My clients received error-free scalable and highly effective software solutions, boosting their business efficiency and profitability. This not only gives them a competitive edge but also paves their way towards becoming market leaders. 𝐍𝐞𝐞𝐝 𝐞𝐟𝐟𝐞𝐜𝐭𝐢𝐯𝐞, 𝐇𝐢𝐠𝐡-𝐈𝐦𝐩𝐚𝐜𝐭 𝐬𝐨𝐥𝐮𝐭𝐢𝐨𝐧𝐬? 𝐇𝐞𝐫𝐞'𝐬 𝐰𝐡𝐚𝐭 𝐈 𝐜𝐚𝐧 𝐨𝐟𝐟𝐞𝐫: ✔️ API development for seamless connection and usage across platforms. ✔️ API integration with any third-party solutions. ✔️ Tailor-made systems from the ground up for automating business processes. ✔️ Custom infrastructure based on cutting-edge technologies to transform your ideas into reality and meet your business requirements. ✔️ Highly scalable database structures. ✔️ Real-time log analytics with commercial/custom dashboards. ✔️ CI/CD to automate your workflow from commit, testing, deployment, notification, and more. ✔️ Comprehensive testing across all project domains, encompassing all use cases, edge cases, and complete end-to-end scenarios. 𝐈 𝐜𝐚𝐧𝐧𝐨𝐭 𝐡𝐞𝐥𝐩 𝐞𝐯𝐞𝐫𝐲𝐛𝐨𝐝𝐲, 𝐛𝐮𝐭 𝐰𝐞 𝐦𝐚𝐲 𝐛𝐞 𝐚 𝐠𝐫𝐞𝐚𝐭 𝐟𝐢𝐭 𝐢𝐟 𝐲𝐨𝐮 𝐚𝐫𝐞 𝐭𝐡𝐢𝐧𝐤𝐢𝐧𝐠: ● "I need a solution that I can trust 100% to solve our problems RIGHT.” ● "We have ambitious goals and need a solution architect who can build scalable solutions to match our growth.” ● "I'm not satisfied with out-of-box applications. We need an expert who can build custom applications to meet our requirements.” ● "We're willing to invest in premium solutions that adhere to the highest industry standards. That’s why we need the BEST developers who place a premium on quality.” 𝐖𝐨𝐫𝐤𝐢𝐧𝐠 𝐰𝐢𝐭𝐡 𝐦𝐞, 𝐲𝐨𝐮 𝐰𝐢𝐥𝐥: ✔️ Save your money by getting clean, efficient code that is easy to read, understand, and extend for any future needs your business might have. A well-known fact is that a well-developed and SOLID principals-based application is much cheaper and faster to expand and modify than developing a new one from scratch whenever business requirements change. ✔️ Get support and warranty on all delivered projects. ✔️ Have a reliable and committed partner that guarantees tasks are executed flawlessly, punctually, and in the most effective manner. ✔️ Focus on more important tasks without distractions, as I handle your technical problems and challenges. ✔️ Witness rapid business expansion through advanced technology solutions customized to your company's needs. 𝐂𝐨𝐫𝐞 𝐄𝐱𝐩𝐞𝐫𝐢𝐞𝐧𝐜𝐞 & 𝐓𝐞𝐜𝐡𝐧𝐢𝐜𝐚𝐥 𝐊𝐧𝐨𝐰𝐥𝐞𝐝𝐠𝐞: 🔸 Backend Development: NodeJS, NestJS, Express, Fastify 🔸 Frameworks & Testing: Prisma, Jest, Passport, ESLint 🔸 Programming: JavaScript, TypeScript 🔸 Infrastructure as Code: Terraform, CloudFormation 🔸 API Development & Integration: RESTful, GraphQL, Google APIs, Stripe 🔸 SQL Management: PostgreSQL, MySQL, RDS 🔸 NoSQL Management: MongoDB, Redis, DynamoDB 🔸 Compute & Serverless: Lambda, EC2, API Gateway 🔸 Authentication & Authorization: Cognito, Auth0 🔸 Messaging & Notification Services: SES, SQS, SNS, EventBridge, AWS Chatbot 🔸 Storage & Content Delivery: S3, Amazon Location Service, Route 53, CloudFront 🔸 Networking & Security: VPC, IAM, KMS, Parameter Store 🔸 Monitoring & Data Analytics: CloudWatch, X-Ray, Athena, Amazon QuickSight 🟢 𝐑𝐞𝐚𝐝𝐲 𝐭𝐨 𝐓𝐚𝐤𝐞 𝐭𝐡𝐞 𝐍𝐞𝐱𝐭 𝐒𝐭𝐞𝐩? Let's connect! I'm passionate about employing my expertise to drive your project to new heights. Send me a message to explore how we can achieve groundbreaking success together.
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    NetSuite Techno-Functional Consultant. NetSuite Certified Administrator and Project Manager with over 8 years of professional experience in Implementation & customization of NetSuite ERP NetSuite Certifications: • NetSuite Certified Administrator (#13123) • NetSuite Certified SuiteFoundation (#8254) Areas of Expertise: • SuiteScript 1.0/2.0/2.1 • Advanced PDF/HTML Template Customization • Saved Search, Workflow • File Transfer via Secure File Transfer Protocol (SFTP) • CSV Import/Export • EFT Payment Template Customization • NetSuite Dashboard/Custom Form In-depth understanding of *NetSuite Administration *Data Migration *Suite Cloud (Customization, Scripting & Integration/ web services) *SuiteFlow(Workflow) *Suite Analytics(Reports and Searches) *Lead to Cash and Procure to Payment Cycle *Inventory and warehouse *Support Management *Suite Bundle and Sales Force Automation. Proven skills in providing expert consultancy on - Administration - Implementation - Support - Integration and functionality of NetSuite - WMS - Purchase - Inventory - O2C - P2P - Lead nurturing - Sales Force Automation - Case Management - Customization and Workflows. -Celigo integrator.io Expertise in Suite Script 1 and 2 with special emphasis in JavaScript programming and One Week NetSuite MasterClass onsite is completed successfully. Demonstrated abilities in handling project management activities involving project estimation, scope definition, process rationalization, monitoring, tracking & delivery Expert in analyzing information system needs, evaluating end-user requirements, custom designing solutions and troubleshooting for complex information systems management Well versed in the creation of scripts for concurrent executables & concurrent programs for interfaces and report writing, the installation scripts and Migration Document An effective communicator with exceptional relationship management skills with the ability to relate to people at any level of business and management and significant experience working with customers, project managers and technical teams for securing & executing concurrent projects To assist you with your NetSuite projects, we have resources with the following certifications. NetSuite SuiteFoundation Certification NetSuite Suite Developer II Certification NetSuite Administrator Certification NetSuite ERP Certification NetSuite SuiteCommerce Certification Celigo Certification ISTQB Certification Multi-book Accounting authorized Advanced Revenue Management authorized
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How to Hire Top Back-End REST API Developers

How to hire top back-end REST API developers

Whether your goal is to set up the basic back-end APIs needed for any app to function or to build the public APIs that will let you plug into the lucrative API economy, back-end REST API developers are here to help. 

So how do you hire back-end REST API developers? What follows are some tips for finding top back-end REST API developers on Upwork.

How to shortlist back-end REST API professionals

As you’re browsing available back-end REST API consultants, it can be helpful to develop a shortlist of the professionals you may want to interview. You can screen profiles on criteria such as:

  • Technology fit. You want a back-end REST API developer who understands the back-end technologies behind your API project. 
  • Project experience. Screen candidate profiles for specific skills and experience (e.g., writing APIs for an ASP.NET back end).
  • Feedback. Check reviews from past clients for glowing testimonials or red flags that can tell you what it’s like to work with a particular back-end REST API developer.

How to write an effective back-end REST API job post

With a clear picture of your ideal back-end REST API developer in mind, it’s time to write that job post. Although you don’t need a full job description as you would when hiring an employee, aim to provide enough detail for a contractor to know if they’re the right fit for the project.

Job post title

Create a simple title that describes exactly what you’re looking for. The idea is to target the keywords that your ideal candidate is likely to type into a job search bar to find your project. Here are some sample back-end REST API job post titles:

  • Back-end REST API developer needed with Node.js expertise
  • API integration for an ecommerce website
  • Back-end REST API development help with a fintech app

Back-end REST API project description

An effective back-end REST API job post should include: 

  • Scope of work: From third-party integrations to public APIs, list all the deliverables you’ll need. 
  • Project length: Your job post should indicate whether this is a smaller or larger project. 
  • Background: If you prefer experience with certain technologies or developer tools, mention this here. 
  • Budget: Set a budget and note your preference for hourly rates vs. fixed-price contracts.

Back-end REST API developer job responsibilities

Here are some examples of back-end REST API developer job responsibilities:

  • Write APIs that integrate front-end features with back-end resources and business logic
  • Implement integrations with third-party APIs
  • Design, implement, and maintain data storage solutions
  • Test and validate API implementations

Back-end REST API developer requirements and qualifications

Be sure to include any requirements and qualifications you’re looking for in back-end REST API developers, such as:

  • Back-end REST API
  • Web development
  • Back-end development
  • Desired technology stack

Back-End REST API Developers FAQ

What is back-end REST API development?

Every app has a front end and a back end. In order for these two halves to communicate with one another, there needs to be a standardized API (application programming interface) for sending and receiving data. REST (Representational State Transfer) is an architectural style for creating these standardized APIs. APIs can be used to link a client to its back end or the server side of a third-party app. 

How much does it cost to hire a back-end REST API developer?

The first step to determining the cost to hire a back-end REST API developer will be to define your needs. Rates can vary due to many factors, including expertise and experience, location, and market conditions.

Cost factor #1: project scope

The first variable to consider when determining scope is the nature of the work that needs to be completed. Not all back-end REST API projects are created equally. Pulling data from your social media accounts through a publicly available API will take less time than building your own custom analytics API. 

Tip: The more accurately your job description describes the scope of your project, the easier it will be for talent to give you accurate cost estimates and proposals.

Cost factor #2: back-end REST API developer experience

Choosing the right level of expertise for the job is closely tied to how well you determined the scope of your project. You wouldn’t need an advanced developer to write basic APIs to link your single-page app (SPA) with its back end. On the other hand, creating a public API for your SaaS (software as a service) app from which your customers will be able to programmatically extract data for their own services will require a seasoned developer who can ensure the security of your application.

Beyond experience level, you need to consider the type of experience the talent possesses. The following table breaks down the rates of the typical types of back-end API developers you can find on Upwork.

Rates charged by back-end REST API developers on Upwork

Level of Experience Description Hourly Rate
Beginner Entry-level expertise in back-end fundamentals: database solutions (e.g., MySQL, PostgreSQL, MongoDB), web servers (e.g., nginx, J2EE, Node.js), cloud solutions (e.g., AWS, Azure, Google Cloud), server-side languages (e.g., Java, Python, PHP), and RESTful API development.  $30-50+
Intermediate Beyond fundamentals, specialization in industry-specific API use cases (e.g., Shopify API for ecommerce).  $60-90+
Expert Full-stack development expertise (front end and back end). Experience leading teams of developers to carry a product through the SDLC (software development lifecycle). Capable of writing secure, enterprise-level public APIs for commercial products.  $100-120+

Cost factor #3: location

Location is another variable that can impact a back-end REST API developer’s cost. It’s no secret that you can leverage differences in purchasing power between countries to gain savings on talent. But it’s also important to factor in hidden costs such as language barriers, time zones, and the logistics of managing a remote team. The real advantage to sourcing talent remotely on Upwork is the ability to scan a global talent pool for the best possible person for the job. Location is no longer an obstacle. 

Cost factor #4: independent contractor vs. agency

The final variable regarding talent cost is hiring an independent contractor vs. an agency. An agency is often a “one size fits all” model, so you’ll often have access to a designer, a project manager, an engineer, and more. When hiring individuals you have total autonomy regarding who is responsible for which part of the project, but you’ll need to source each of those skills separately.

The trade-off between hiring individuals vs. hiring an agency is the level of administrative overhead you incur personally in coordinating tasks among all members of the team. Project scope and personal preference will determine which style is a better fit for your needs.

Common back-end REST API developer mistakes

Unencrypted APIs: You should always use some form of encryption for your APIs. At a minimum, SSL or TLS should be used to encrypt any data flowing through your APIs. Insecure APIs are a common access point for data breaches. People often liken APIs to gateways, but they are more like tunnels that ensure information can travel only between two points. Failing to use encryption would be like leaving the maintenance access door to your tunnel unlocked, allowing a malicious third party access to your traffic or to go somewhere the public is not supposed to be able to reach. 

Nondescript error codes: It can be tempting when writing lots of APIs to return the generic 400 Bad Request error code. But as is often the case in life, taking shortcuts and cutting corners can lead to headaches further down the line. Poorly scripted API error messages are a recipe for increased support tickets and rising blood pressure for the poor developer who has to address them. And for customer-facing APIs, it can lead to bad press and poor user reviews. 

Oftentimes, simply taking the extra step to use the appropriate standard HTTP status code is enough to direct most developers to the source of the issue. 401 means the failure was caused by an authentication error, while 403 means the request was understood but the user didn’t have the right permissions. For cases where the standard error codes aren’t enough, however, it can be helpful to include a simple message or a link to a help page for more information on your site.

Not versioning REST APIs: The digital world is constantly changing. You need to make sure that your APIs remain up to date with the latest security and performance best practices, and sometimes that means making app-breaking changes on the back end. That’s why it’s important to practice versioning early on, especially if this is for a customer-facing API. This will allow you to take advantage of new data technologies and improving services while still providing service to slow adopters within your customer base. You can implement versioning in the request header or the endpoint URI. 

Tips and best practices

Use nouns instead of verbs when naming API endpoints

REST takes a resource-based approach to API development. The actions you can perform are strictly defined by HTTP methods such as GET, PUT, POST, and DELETE. Since actions on resources in HTTP are verbs, it makes more semantic sense to name your endpoints as nouns. So instead of calling GET /addUser123, calling GET /users/123 is preferred. The latter naming is better because anyone looking at your code can immediately tell that 123 is likely an ID for a single user from a collection of users. 

Save resources by filtering your queries

Speaking of resource collections, they can get pretty huge. Sites can have thousands of users, so how can we make our API calls more efficient? The answer is to make more-specific queries. You don’t need to pull the entire list every time the front end of your app needs a certain resource. You can use filtering, sorting, and paging to narrow down the number of results being pulled in an API request. 

  • Filtering lets you narrow query results by named parameters such as price or country. 
  • Sorting lets you pull results in ascending or descending order by a selected parameter such as date. 
  • Paging lets you place a limit on the number of results being pulled per view. 

Document your APIs

At the end of the day, whether your API is for internal use or in a customer-facing product, it’s important for others to be able to read and understand how to use it. API documentation is a skill in and of itself. Documentation should be well written and easy to navigate. It should clearly tell developers what they can and cannot do with your API, what specific commands they are able to make, and the preferred data format they should use. 

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