Name: Java developers
Brand: Upwork
Rating: 4.8 (1667 reviews)

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4.8/5

based on 1,667 client reviews

$35 hourly
- 5.0/5
- (18 jobs)
I have experience in making applications for mobile platforms with Unity, as well as native plugins and SDK wrappers for Unity and Unreal Engine.

Java
iOS SDK
Android SDK
Unity
Unreal Engine
iOS
Android
Objective-C
C#
C++
$35 hourly
- 5.0/5
- (9 jobs)
Portal for developers, OpenAPI specifications, Documentation templates, Software Architecture docs, Developers and Admin guides from scratch Production guides System architecture diagrams and description Multiple markets projects with localisation Translation and proofreading of docs API Documentation Rest API SOAP GraphQl Desktop applications Health care systems HL7 interfaces Software integrations

Java
OpenAPI
API Documentation
Swagger
Translation
Instruction Manual
Postman
Technical Writing
QA Testing
API
Software Documentation
$59 hourly
- 5.0/5
- (6 jobs)
Hello! I possess the expertise to transform your Big Data into significant profits. As an adept in UI/UX for Excel, my multifaceted background encompasses finance, mathematics, development, and an enthusiasm for coffee. My skill set is broad, including optimization modeling, systems modeling, business engineering, data science, and an extensive understanding of forecasting within the business realm. I am proficient in programming across various platforms and languages, including Python, R, VBA (Excel), Java (Android Studio), JavaScript (Google Sheets), SQL, and Xcode (iOS). I am eager to leverage my diverse capabilities to propel your next project towards success.

Java
Data Ingestion
Google Sheets
Android Studio
Model Optimization
Financial Analysis
Forecasting
Financial Software
API Integration
Financial Model
SQL
JavaScript
Microsoft Power BI
Data Analysis
$40 hourly
- 4.9/5
- (49 jobs)
Experienced in cross-platform and native mobile apps development, admin panels, dashboards, cloud, IOT solutions, web applications and back-end. My specialization: geolocation and Google Maps / MapBox / OpenStreetMap; VoIP apps for voice and video calls; payment system integration; social network API for authorization; REST API and Database providing; BL/BLE with other devices; chats; machine learning; Application types I have created: tracking and navigation apps with GPS and BL/BLE usage; dating and social network apps; messaging applications; multimedia and entertainment apps; application for cooperation with IOT devices; manufacturing app to work with company's staff and other infrastructure. I try to approach the project solution structurally and uniquely, which allows me to save clients' time. I know that it is very important for customers to be always in touch, so I do not have days off and I try to answer around the clock.

Java
UI/UX Prototyping
React Native
Angular
Android
Embedded Application
Swift
Flutter
Qt Framework
Internet of Things Solutions Design
QML
C++
$35 hourly
- 5.0/5
- (6 jobs)
As a senior mobile developer with +8 years of experience, I have developed many native and hybrid mobile apps for versatile industry. My main focus is on hybrid mobile app development using React Native and Flutter. My main domain is E-Commerce, Healthcare, Fitness, Astrology, Travel, Learning and Chatting app. Here are my main technical skills: - Tools and frameworks: React Native, Flutter Java, Kotlin, Swift, Dart, JavaScript, TypeScript Android Studio, Xcode - Cloud Services: AWS, Azure, GCP, Firebase, Shopify - Unit Testing Jest, RNTL (React Native Testing Library) My main expertise: - Optimizing performance Minimizing re-renders using React powerful hook ecosystem like useMemo, useEffect, useCallback with specific dependencies Lazy loading and windowing technology - Implementing various animations Leveraging various animation libraries like React Native Reanimated, React Native Animatable, React Spring, Lottie, Flutter Animator, etc - Various API integration Rich hands-on experience in SSO like Google, Facebook, X, Github, etc and payment integration - Unit Testing I am strongly experienced in creating native modules and native UI threads for React Native and platform specific method channel for Flutter using Java, Kotlin, Swift and Dart. I am also experienced in implementing wallet connections and building NFT platform. I have exceptional problem-solving skill to make the project in steady progress. I am always staying up to date with the most trending technology and method and trying to leverage it. I have a good sense of humor and collaborate with the client and team members very well. I always try best to exceed the client's expectation and deliver the best result before the deadline. - Devices I have: Samsung Galaxy A05F, iPhone 14 Dell Laptop, Desktop I really look forward to working with you and bringing your idea to a real life. Please be with me.

Java
API Integration
Hybrid App Development
Android App Development
Mobile App Development
Firebase
iOS
Android
Swift
Kotlin
Dart
TypeScript
JavaScript
Flutter
React Native
$40 hourly
- 5.0/5
- (13 jobs)
𝗧𝗿𝗮𝗻𝘀𝗳𝗼𝗿𝗺𝗶𝗻𝗴 𝗛𝗲𝗮𝗹𝘁𝗵𝗰𝗮𝗿𝗲 𝗮𝗻𝗱 𝗠𝗮𝗻𝗮𝗴𝗲𝗺𝗲𝗻𝘁 𝘄𝗶𝘁𝗵 𝗖𝘂𝘀𝘁𝗼𝗺 𝗦𝗼𝗳𝘁𝘄𝗮𝗿𝗲 𝗦𝗼𝗹𝘂𝘁𝗶𝗼𝗻𝘀🏥📊 At Krasty Soft, we focus on revolutionizing healthcare and management through custom software development. Our expertise lies in building internal tools using Retool, enabling us to create intuitive dashboards, CRMs, and analytics tailored to the specific needs of healthcare organizations. Retool's flexible drag-and-drop capabilities allow us to quickly develop and integrate solutions, enhancing patient care and operational efficiency. Beyond Retool, we specialize in web application development using React.js, Python, Java, Go, and Node.js, as well as creating responsive mobile solutions with Flutter. Our team excels in creating robust solutions that seamlessly integrate with healthcare systems, optimizing workflows, and managing patient data. We aim to provide healthcare providers and management teams with the tools they need to streamline operations and make informed decisions. Whether it's developing a custom CRM or an analytics dashboard, we bring your vision to life with our expertise in React, Python, and Retool. We could offer you the development of: 🔹Electronic Health Records (EHR) Systems 🔹Practice Management Software 🔹Patient Management Systems 🔹Telemedicine Platforms 🔹Medical Billing and Coding Software 🔹Healthcare CRM 🔹Clinical Decision Support Systems (CDSS) 🔹Laboratory Information Management Systems (LIMS) 🔹Pharmacy Management Software 🔹Medical Imaging Software 🔹Patient Portal Software 🔹Healthcare Analytics Platforms 🔹Appointment Scheduling Systems 🔹Health Information Exchange (HIE) Systems Our tech stack includes: ✅HTML5/CSS3 ✅Javascript/Typescript ✅Retool (no-code, low-code) ✅React.js, Redux, React-Query, Next.js ✅MUI, styled-components, TailwindCSS ✅Node.js, Express.js, Next.js ✅Python, Django, Flask, FastAPI ✅Java, Golang ✅Elasticsearch ✅AWS, Lambda, Docker ✅API development ✅NoSQL, MySQL, PostgreSQL Let’s bring your ideas to life! Drop us a message to get started. Keywords list #React #ReactJS #ReactDevelopment #JavaScript #FrontendDevelopment #Frontend #Front-End #UIUX #WebDevelopment #SinglePageApplications #SPAs #MultiPageApplications #MPAs #Redux #ReactRouter #NextJS #Next #Next.js #Gatsby #MaterialUI #MUI #ChakraUI #StyledComponents #TailwindCSS #Bootstrap #Webpack #Babel #GraphQL #APIs #RESTfulAPIs #Axios #TypeScript #JavaScriptFrameworks #UIComponents #ES6 #FrontendFrameworks #ComponentBasedArchitecture #ReactHooks #eCommerceWebsites #Dashboards #AdminPanels #PWA #ProgressiveWebApps #ContentManagementSystems #HeadlessCMS #JAMstack #Storybook #SaaS #ReactQuery #Jest #E2E #UnitTesting #Python #FastAPI #Django #Flask #NodeJS #Node #ExpressJS #NestJS #Golang #Go #Java #SpringBoot #Kubernetes #Docker #AWS #Lambda #Elasticsearch #Puppeteer #PostgreSQL #MySQL #MongoDB #NoSQL #Microservices #BackendDevelopment #FullStackDevelopment #MobileDevelopment #Flutter #CrossPlatformDevelopment #CustomSoftware #CRMDevelopment #Automation #AnalyticsTools #EcommercePlatforms #HealthcareApps #FintechSolutions #EnterpriseSoftware #RealTimeApplications #AIIntegration #Retool #Backend #FullStack #MERN

Java
CRM Development
Dashboard
Low-Code Development
Back-End Development
Front-End Development
Flutter
Mobile App Development
Golang
Full-Stack Development
Python
JavaScript
React
Node.js
Web Development
$45 hourly
- 4.9/5
- (22 jobs)
💼 Top-Rated AI Specialist with 100% Job Success | 10+ Years of Experience 🌍 Trusted by 20+ Businesses Worldwide I specialize in creating intelligent AI-driven solutions that automate business processes and enhance customer interactions. Whether you’re looking to develop a chatbot, integrate AI into your existing infrastructure, or automate complex workflows, I’m here to guide you from concept to completion. I help businesses in the service industry, e-commerce, and financial sectors save time, improve customer service, and optimize workflows through AI-powered automation. 💡 What Sets Me Apart: Full-Cycle AI Chatbot Development I offer end-to-end chatbot development — from strategy and design to deployment and maintenance. My solutions are custom-built to suit your business goals and user needs. Business-First Approach I don’t just build chatbots. I create solutions that solve specific business problems, whether it’s improving customer engagement, increasing sales, or automating repetitive tasks. Your business objectives are always at the forefront of the development process. User-Centered Conversation Design I believe in designing conversations that feel natural. With a background in linguistics and AI, I ensure your chatbot speaks the language of your audience and delivers an engaging, user-friendly experience. Deep Technical Expertise & AI Specialization With a strong foundation in Natural Language Processing (NLP), Machine Learning, and AI-driven automation, I understand not only how chatbots work but how to maximize their potential in a business setting. Clear, Transparent Communication I value your time and mine. You’ll always receive direct, honest feedback, and I’m committed to ensuring our collaboration is seamless and productive. 🔧 How I Can Help Your Business: Custom AI Chatbot Development I build chatbots on leading platforms like Dialogflow, OpenAI API, ManyChat, and Rasa, ensuring that your bot is tailored to your unique needs and integrates with your existing systems. Integration with Business Systems Whether it’s CRM systems, Google Sheets, or other third-party APIs, I’ll seamlessly integrate your chatbot with your business processes, enabling data collection, automation, and real-time updates. Conversation Design & Optimization If you already have a chatbot, I can audit your existing solution, identify areas for improvement, and enhance the conversational flow to make it more engaging and user-friendly. 🛠 Tech Stack & Expertise: - Programming Languages: JavaScript, TypeScript, Node.js, Python - AI/ML Tools: OpenAI API (ChatGPT, GPT-4), Dialogflow CX, Rasa, Langchain - Databases: Firebase, MongoDB, MySQL - Front-End: React.js, Bootstrap, HTML5/CSS3 - APIs & Integrations: CRM Systems, Google Sheets, Twilio, SendPulse, Telegram, WhatsApp, Slack - Deployment: Docker, AWS, Google Cloud 🏆 Featured Projects: - AI-Powered Customer Support Bot for a leading e-commerce company, reducing customer support time by 40%. - Tourism Chatbot integrating real-time bookings and personalized recommendations, improving customer experience and reducing booking errors. - Financial Assistant Chatbot automating client inquiries and investment suggestions for a financial services firm. 🚀 Let’s Bring Your AI Project to Life! If you’re looking for an AI specialist to help you streamline operations, engage customers, and automate complex tasks, let’s chat. I’ll ensure your project is delivered on time with the highest standards of quality.

Java
ChatGPT
Dialogflow
Chatbot Flow Design
Web Development
API Integration
Make.com
ManyChat
Telegram API
Flow XO
Chatbot Development
Dialogflow API
Bot Development
Google App Engine
Chatbot
$35 hourly
- 4.9/5
- (5 jobs)
Specializing in 𝐟𝐮𝐥𝐥-𝐬𝐭𝐚𝐜𝐤 web and mobile development, our team brings expertise in Java, Node.js, and .NET for robust back-end solutions, and Angular, React, and Vue.js for seamless front-end experiences. Whether you're launching a new project or enhancing an existing one, we provide end-to-end development services designed specifically to meet your business goals. ✅ Why partner with us? 9+ years of hands-on experience with a spotless reputation for quality and reliability Successfully completed 50+ projects for clients in the US, Canada, and EU 30+ client reviews that reflect our commitment to success Continuous improvement through 28 in-house training academies, ensuring our team stays at the cutting edge What we deliver: We know what it takes to bring your idea to life. After launching dozens of SaaS tools, we've mastered: Smooth onboarding processes (say goodbye to long, complex forms) Intuitive UI/UX with clear, easy-to-use interfaces Advanced yet simple filtering & sorting features that make navigation a breeze Our technical expertise includes: JavaScript & Node.js Spring Boot C++ Microservices & API Development Recent success stories: CloudDefense: A SaaS platform that identifies software vulnerabilities Popsicle: A platform for managing afterschool and camp programs MedischeScholing: An online education hub for healthcare professionals Aioneers: Supply chain management software Selro: A multi-channel eCommerce solution 🗓 Let’s discuss how we can make your project a success this week!

Java
Web Application
SQL
Microsoft SQL Server
ASP.NET MVC
.NET Framework
ASP
C#
Microservice
C++
API
Spring Boot
CSS
Node.js
JavaScript
$35 hourly
- 5.0/5
- (30 jobs)
Thanks for reading my profile. I am a passionate Full Stack Developer with a strong background in Front-End, Back-End, API, and Database technologies across a variety of industries including E-Commerce, Education, Reservation Systems, Real Estate, Insurance, SAAS, etc. My journey in the world of technology began at the Yuriy Fedkovich Chernivtsi National University in Ukraine, where I developed a unique hobby for computer science. 🅰️ My Principles: ✅ Pixel Perfect ✅ Structured and Optimized Database ✅ Speed and Code Optimization ✅ Strong Security ✅ Smart and Clean Coding 🅱️ Tech Stacks: ✅ Angular, React, Shopify, HTML, CSS, Liquid, Bootstrap, JavaScript, TypeScript ✅ Spring, Spring Boot, Spring Cloud, Spring Security, NodeJS, Express, NestJS, PHP, Laravel ✅ MySQL, PostgreSQL, Oracle, MongoDB, Liquibase, Firebase ✅ API Gateway, Service Discovery, REST API, SOAP ✅ Apache Maven, Gradle, Docker ✅ Git, GitHub, GitLab, BitBucket Please feel free to contact me for your next amazing creation.

Java
Tailwind CSS
HTML
TypeScript
JavaScript
Apache Maven
MySQL
RESTful API
PHP
NestJS
ExpressJS
Node.js
React
Angular
Spring Boot
$35 hourly
- 5.0/5
- (13 jobs)
Full Stack and AI Developer with full experience for the remote work for the Europe and US companies. I would like to be independent and like to deliver best results to client. I have good experience in Web, mobile development and bult many AI products and have good skills in English.

Java
Node.js
Svelte
Vue.js
Chatbot
Artificial Intelligence
Fabric.js
React
JavaScript
Rust
PostgreSQL
TypeScript
Python
$54 hourly
- 5.0/5
- (4 jobs)
I am a skilled full stack web and mobile app developer with more than 7 years of expertise in developing web and desktop software applications. My main stack/skills: - C#, .NET, ASP.NET, WPF, WinForms, Entity framework - Python, C++, Java - Electron.js - Flutter - React, Node - MySQL, MongoDB, PostgreSQL - AWS, Azure, GCP - CI/CD Pipelines - Terraform, Kubernetes, Ansible - Github Actions

Java
Qt Framework
Microsoft Azure
MySQL
Desktop Application
React
Node.js
Web Application
Electron
Python
C++
.NET Framework
C#
$55 hourly
- 5.0/5
- (2 jobs)
Dynamic and detail-oriented Full Stack Developer with 10 years of comprehensive experience in building robust web applications and services. Proficient in both front-end and back-end technologies, I possess a robust understanding of the entire software development lifecycle, from conceptualization to deployment and maintenance. *Technical Skills:* - Front-end Technologies:** HTML5, CSS3, JavaScript, React.js, Angular, Vue.js, Bootstrap - Back-end Technologies:** Node.js, Express.js, Ruby on Rails, Django, Java Spring - Database Management:** MongoDB, MySQL, PostgreSQL, Firebase - Version Control:** Git, GitHub, Bitbucket - DevOps & Cloud Services:** Docker, Kubernetes, AWS, Azure, CI/CD pipelines - API Development:** RESTful services, GraphQL - Testing & Debugging:** Jest, Mocha, Selenium, Postman *Professional Experience:* - Developed and maintained scalable, responsive web applications for diverse industries, ensuring optimal user experience across all devices and platforms. - Collaborated with cross-functional teams, including designers, product managers, and QA engineers, to define project requirements and build solutions in an agile environment. - Spearheaded the migration of legacy systems to modern architectures, significantly improving performance and maintainability. - Implemented RESTful APIs and integrated third-party services, enhancing application functionality and user engagement. - Employed best practices in code review and testing to ensure high-quality software releases, adhering to established timelines. *Passion & Interests:* I am passionate about emerging technologies and continuously pursue knowledge through online courses, workshops, and personal projects. I enjoy participating in hackathons, contributing to open-source projects, and staying up-to-date with industry trends. My goal is to create innovative solutions that positively impact users and businesses. *Soft Skills:* - Excellent problem-solving abilities - Strong communication and interpersonal skills - Ability to work independently and as part of a team - Adaptability and eagerness to learn I am excited about the opportunity to leverage my full-stack development skills to create effective and user-friendly digital solutions. Let’s connect and explore how I can contribute to your success!

Java
Python
HTML5
TypeScript
JSON
Vue.js
web3.js
JavaScript
React
SwiftUI
Firebase
Flutter
React Native
Kotlin
Swift
$37 hourly
- 5.0/5
- (5 jobs)
🙌 Experienced Senior Full Stack AI Engineer with over 15 years dedicated to the development, optimization, and maintenance of both frontend and backend systems for large-scale applications. Skilled in Python, Java, JavaScript, and various web frameworks, I have a proven track record utilizing advanced technologies. Proficient in Django, FastAPI, Flask, Node.js, Express.js, and Spring Boot for backend development. On the frontend side, I excel in React.js, Angular, and Spring frameworks. 👌 Key Expertise and Technologies: • Artificial Intelligence (AI): Specialized in developing AI-driven applications and systems, including generative AI for text, image, and video generation. • Generative AI: Skilled in creating generative models for text, image, and video content using state-of-the-art techniques such as Hugging Face, LoRA, and DreamBooth. • Comfy UI: Proficient in designing and implementing user-friendly interfaces with Comfy UI for enhanced user experiences. • Hugging Face: Experienced in leveraging Hugging Face's transformers and models for natural language processing and other AI applications. • LoRA (Low-Rank Adaptation): Expertise in fine-tuning large language models efficiently using LoRA techniques. • DreamBooth: Skilled in using DreamBooth for personalized content generation and model customization. • Computer Vision: Expertise in building and optimizing computer vision algorithms and applications. • Chatbot Development: Skilled in creating intelligent chatbots using frameworks like Rasa, Dialogflow, and custom solutions. • Automation: Expert in automating processes and workflows using Python scripting, Bash scripting, and various automation tools. • Web Scraping: Proficient in web scraping using tools like BeautifulSoup, Scrapy, and Selenium to extract and process data efficiently. • Microservices Architecture: Designing scalable and efficient microservices architectures. • API Development and Integration: Building and integrating robust APIs. • Complex Database Systems: Managing and optimizing complex relational and non-relational databases (SQL, NoSQL). • Cloud Computing: Leveraging cloud platforms such as AWS, Azure, and Google Cloud Platform (GCP) for enhanced performance and scalability. • Web Application Infrastructure: Expertise in setting up and maintaining secure and efficient web app infrastructure. • Advanced Algorithms & Data Structures: Implementing sophisticated algorithms and data structures to solve complex problems. • DevOps and CI/CD Pipelines: Integrating DevOps practices and continuous integration/continuous deployment (CI/CD) to streamline development and deployment workflows. • Agile Methodologies: Experienced in Agile and Scrum practices to deliver high-quality software efficiently. • Testing and Quality Assurance: Proficient in using tools like JUnit, Selenium, Postman, and Jest for comprehensive testing and QA. • Version Control: Expert in version control using Git and platforms like GitHub, GitLab, and Bitbucket. • Containerization and Orchestration: Proficient in using Docker and Kubernetes for containerization and orchestration. • Frontend Technologies: Extensive experience with HTML5, CSS3, JavaScript, React.js, Angular, and Vue.js. • Backend Technologies: Proficiency in Python, Java, Node.js, Spring Boot, Express.js, Django, FastAPI, Flask. 👀 Passionate about embracing new technological challenges and dedicated to driving innovation through a combination of technical skills and creative solutions. Ready to help your business navigate the complexities of modern software development, AI engineering, and deliver exceptional digital experiences. Thank you

Java
Docker
SaaS Development
Database
Angular
React
Vue.js
TypeScript
JavaScript
Chatbot Development
RESTful API
Django
FastAPI
Python
Web Development
$40 hourly
- 5.0/5
- (2 jobs)
I am a seasoned mobile app developer with over 8 years of experience designing, developing, and deploying cutting-edge mobile applications for both Android and iOS platforms. My specialty is integrating advanced AI technologies to create intelligent, user-centric apps. ✔ Mobile Development: Swift, Kotlin, Java, Flutter, and React Native. ✔ Backend Development: Knowledgeable in Node.js, Django, and Firebase for robust backend support. ✔ AI Integration: Experienced with machine learning frameworks such as TensorFlow, PyTorch, and Core ML. Skilled in implementing natural language processing, computer vision, and predictive analytics. ✔ UI/UX Design: Strong focus on creating intuitive and engaging user interfaces using Sketch, Figma, and Adobe XD. ✔ Project Management: Adept at Agile methodologies, version control (Git), and continuous integration/continuous deployment (CI/CD). If you are looking for a dedicated and professional full stack developer to build web & mobile applications, let's connect and discuss details about your project.

Java
Android
Firebase
FlutterFlow
SwiftUI
Flutter
React Native
Mobile App Development
iOS Development
Swift
PostgreSQL
JavaScript
React
Kotlin
Node.js
$40 hourly
- 5.0/5
- (2 jobs)
👋 Greetings, I`m an experienced team lead / senior Java software developer with 8+years of hands-on web&mobile applications in ✔️ e-commerce, ✔️ FinTech, ✔️ SaaS domains, for mid-size and enterprise projects My Specialization ✅ Java (8+): Widely utilizing recent Java features, including Lambdas, Stream APIs, DateTime APIs, and Functional Interfaces. ✅ Java EE: RESTful Services, SOAP Services, JPA, Hibernate, API Integration etc. ✅ Spring: Spring Core, SpringBoot, Spring Data, Spring Cloud, etc. ✅ Other "frameworks": Keycloak authorization, JHipster, Swagger, Liquibase, Axon, Vaadin ✅ SQL Databases: PostgreSQL, MySQL, MariaDB, Oracle ✅ NoSQL Databases: MongoDB, Redis, Hazelcast ✅ Message Broker: Kafka and Zookeeper ✅ Message Queues: ActiveMQ & RabbitMQ. ✅ Testing: JUnit, Spring Test, Mockito, Integration Test, Unit Test. ✅ Versioning: GIT, GITHub, BitBucket, GitLab etc ✅ DevOps: Jenkins, Docker, Kubernetes. ✅ Hands-on design, development, implementation, and optimization of the application. ✅ Apply software engineering best practices including design review, code review, refactoring. ✅ Experienced with the full Software development life cycle (SDLC) including gathering requirements, development (design, coding, debugging), testing & deployment I`m glad to be involved in your project and do my best to reach maximum impact 🚀 Several testimonials from previous clients: 💪 "After Roman has joined our team, we need nothing, except the Roman-clone machine" - my team lead said to HR after the probation period ended 😎 "Anything can happen, even if management is absent, but the team will continue to deliver if Roma is here" - my Lead Project manager in the latest project

Java
OAuth
Web Application
Mobile App
Web Development
Spring Boot
RabbitMQ
MongoDB
SQL
Hibernate
Spring Framework
Database
Microservice
API
Kotlin
$35 hourly
- 5.0/5
- (2 jobs)
I have been developing JavaScript applications for over 5 years, with a primary focus on web development using React.js, Next.js, and Node.js. My expertise lies in SaaS and AI-driven projects, and we have successfully integrated web development with AI across various sectors, including DevOps, SaaS, Legal, Healthcare and HoodTech. Here’s a summary of my key skills: 🔶 Front-end: Proficient in HTML, CSS (SASS/SCSS), Bootstrap, TypeScript/JavaScript, React.js, Next.js, SWR, Redux, Redux-thunk, and Redux-saga. 🔶 Back-end: Experienced in Node.js, Nest.js, Express/Koa, Socket.io, Prisma, and AWS (Lambda, Cognito, Amplify, S3, IoT, etc.), as well as Firebase. 🔶 Databases: Knowledgeable in MongoDB, PostgreSQL, Supabase, Firebase/Firestore, and DynamoDB. 🔶 Build Tools & Package Managers: Familiar with Gulp, Webpack, NPM/Yarn, ESLint, Prettier, and Flow/TypeScript. I am adept at implementing Server-Side Rendering (SSR) and Progressive Web Application (PWA) techniques in my projects.

Java
Mobile App
Spring Boot
C#
Python
WordPress
Next.js
React
Vue.js
Front-End Development
Game
Ecommerce
Web Application
Ecommerce Website
Web Development
$40 hourly
- 5.0/5
- (25 jobs)
With 18 years in Java and JS development and 350+ talents, our team always has available hands to help with your development needs.

Java
iOS Development
React
Node.js
Amazon Web Services
Python
Android
$40 hourly
- 4.9/5
- (16 jobs)
As a full-stack developer, I have a comprehensive understanding of web software development, utilizing modern frameworks and techniques. I possess expertise in frontend architecture, enabling the creation of robust and scalable frontend applications. In addition to my proficiency in AWS services, I am well-versed in various modern frontend frameworks (mostly Angular and React), Node.js/Java/Python, SQL/NoSQL databases. This knowledge allows me to effectively build dynamic and efficient full stack applications. Throughout my career, I have primarily worked in the adtech industry, focusing on both frontend tasks such as real-time bidding (RTB), Google integrations, and Prebid.js, as well as backend development using Node.js and Java. This experience has provided me with a deep understanding of the industry and the ability to deliver high-quality solutions. Other areas where I have gained experience in recent years include web GIS systems (Mapbox/OpenLayers), Chrome and Firefox extensions, and chatbots (Discord).

Java
Angular
Leaflet
OpenLayers
Redux
React
Node.js
JavaScript
SQL
MongoDB
TypeScript
RESTful Architecture
Django
Python
Redis
$50 hourly
- 5.0/5
- (14 jobs)
Fast, smart, efficient work. • 12+ years of experience in IT; • Successfully led and managed a few projects with cross-functional teams across the globe; • Highly experienced front-end & back-end developer with focus on desktop and web applications; • Have in-depth knowledge of Transact-SQL (postgre, ms sql, oracle, etc). Most used languages: C++, Java, C#, Objective-C, Delphi. Short list of used technologies (not full): • ADO.NET • ASP.NET (+Ajax, MVC, WebForms) • WPF • Jetty, Unirest, Jersey • Spring Framework, Hibernate, Guava, Shiro, Jackson, etc • AngularJS, Telerik, Crystal, Bootstrap, DevExpress, etc It doesn't matter what the language you're using. They all are almost the same.

Java
Project Management
Oracle PLSQL
Objective-C
Database Design
PostgreSQL Programming
AngularJS
Windows Presentation Foundation
ADO.NET
.NET Framework
C#
SQL
C++
$56 hourly
- 5.0/5
- (5 jobs)
I’m a ☕ 𝐉𝐚𝐯𝐚 𝐒𝐨𝐟𝐭𝐰𝐚𝐫𝐞 𝐄𝐧𝐠𝐢𝐧𝐞𝐞𝐫 with over a 𝐝𝐞𝐜𝐚𝐝𝐞 𝐨𝐟 𝐞𝐱𝐩𝐞𝐫𝐢𝐞𝐧𝐜𝐞 in developing business applications. I’ve consistently delivered robust, scalable, and maintainable software solutions across different industries like telecommunications, cartography and infrastructure. My passion lies in tackling complex challenges head-on and transforming them into elegant, efficient code. Whether you're looking to build a new application from the ground up, optimize an existing system, or solve a specific problem, I bring a wealth of experience and a results-driven mindset to every project. My expertise extends to cloud technologies, particularly with AWS, where I've architected and deployed cloud-native solutions that are both efficient and resilient. Let's collaborate to turn your vision into a reality with the power of Java. 💻 𝗧𝗲𝗰𝗵𝗻𝗶𝗰𝗮𝗹 𝘀𝗸𝗶𝗹𝗹𝘀 ✅ Object-Oriented Design ✅ Java ✅ Spring stack (Core, MVC, Batch, Boot, Security), JakartaEE(JSF, JSP, EJB) ✅ JPA, Hibernate ✅ MySql, PostgreSQL, Oracle ✅ Cloud (AWS, AWS Lambda, API Gateway, DynamoDB, EC2) ✅ JUnit, Mockito ✅ Maven, Gradle ✅ JavaScript, HTML, CSS ✅ ReactJS ✅ GIT, SVN 📄 𝗖𝗲𝗿𝘁𝗶𝗳𝗶𝗰𝗮𝘁𝗲𝘀 ⭐️ Oracle Certified Associate, Java SE 8 Programmer ⭐️ AWS Certified Solutions Architect – Associate 👨‍🎓 𝗘𝗱𝘂𝗰𝗮𝘁𝗶𝗼𝗻 ⭐️ Master degree in Software Engineering from Yuriy Fedkovich Chernivtsi National University

Java
Docker
PostgreSQL
Spring Framework
Apache Maven
SQL
React
Git
MySQL
Hibernate
AWS Lambda
Amazon DynamoDB
Amazon Web Services
Spring Boot
REST API
$40 hourly
- 5.0/5
- (12 jobs)
Hi! I'm a widely knowledgeable dev with mobile and backend experience. I've been creating mobile apps for the past 6 years. Experienced with Swift for iOS and React Native for Android/iOS. I implemented practically everything an app could have: payments, notifications, Firebase integrations, chats, music apps, file sharing, encryption, geolocation, maps, share sheets, 3rd-party authentication etc. I can lead apps through the whole release cycle - from scratch to distribution. Good knowledge of App Store, Play Market. CI/CD & automation. Extensive understanding of server side. Good understanding of UX. I also worked with OpenCV and DNNs. Get in touch and I will solve your problem. github.com/hbarylskyi

Java
Mobile App Development
Android App Development
iOS Development
Android
iOS
JavaScript
React Native
Firebase
Flutter
Swift
NoSQL Database
$35 hourly
- 5.0/5
- (14 jobs)
✅ A Fullstack developer and software engineer with 𝟏𝟐 𝐲𝐞𝐚𝐫𝐬 𝐨𝐟 𝐞𝐱𝐩𝐞𝐫𝐢𝐞𝐧𝐜𝐞, I specialize in Java, Python & JS. I welcome you to my page with a 𝐒𝐩𝐞𝐜𝐢𝐚𝐥 𝐎𝐟𝐟𝐞𝐫: I am offering a 𝟒𝟎-𝐦𝐢𝐧𝐮𝐭𝐞 𝐟𝐫𝐞𝐞 𝐭𝐞𝐜𝐡𝐧𝐢𝐜𝐚𝐥 𝐜𝐨𝐧𝐬𝐮𝐥𝐭𝐚𝐭𝐢𝐨𝐧. Let's discuss how I can help with your project needs. My favorite frameworks and languages: 𝐉𝐚𝐯𝐚, 𝐒𝐩𝐫𝐢𝐧𝐠 𝐅𝐫𝐚𝐦𝐞𝐰𝐨𝐫𝐤 (Spring Boot, Spring Cloud, MVC, Spring Data, etc.), with production experience in microservices and Docker. Additional Programming Language: 𝐏𝐲𝐭𝐡𝐨𝐧, with a strong affinity for 𝐀𝐖𝐒 𝐬𝐞𝐫𝐯𝐢𝐜𝐞𝐬 like API Gateway, AWS Lambda (Python), DynamoDB, RDS, Kinesis, CloudWatch, and experience in high-load IoT projects. Expertise in 𝐅𝐫𝐨𝐧𝐭-𝐄𝐧𝐝 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭: Proficient in JavaScript, specifically 𝐑𝐞𝐚𝐜𝐭 𝐚𝐧𝐝 𝐍𝐞𝐱𝐭.𝐣𝐬, for building dynamic and responsive web applications. Expertise in 𝐀𝐈 𝐚𝐧𝐝 𝐌𝐋: Skilled in 𝐏𝐲𝐭𝐡𝐨𝐧 𝐟𝐨𝐫 𝐀𝐈 𝐚𝐧𝐝 𝐌𝐚𝐜𝐡𝐢𝐧𝐞 𝐋𝐞𝐚𝐫𝐧𝐢𝐧𝐠 projects, including proficiency with tools and libraries such as Pandas, scikit-learn, TensorFlow, and PyTorch. Experienced in developing solutions involving 𝐍𝐋𝐏, Machine Translation, Time Series Analysis, and Deep Learning. Knowledgeable in Data Preprocessing, Neural Network Design, and implementing complex Graph Databases. I am comfortable in Linux environments and adept at building CI/CD pipelines. I can support the full development cycle, from product requirements to deployment and service monitoring. In addition, I have 5+ years' experience as a Team Leader. I am also in the 𝐭𝐨𝐩 𝟑𝟎% 𝐨𝐟 𝐒𝐭𝐚𝐜𝐤𝐎𝐯𝐞𝐫𝐟𝐥𝐨𝐰 users, with most answers related to the Spring framework. Links to my profiles are available below. Please contact me to benefit from the technical consultation and see how my skills and experience can benefit your project.

Java
Data Scraping
HTML
CSS
Flask
REST API
Web Application
Web Development
Next.js
React
Spring Boot
Spring Framework
Amazon Web Services
SQL
Python
JavaScript
$45 hourly
- 5.0/5
- (25 jobs)
I can develop any kind of mobile application for you. My primary skill is Android development, and I can gather a team of professionals to cover all aspects of application development, including backend, design, iOS, and frontend. I have developed more than 30 apps, and all of my clients are satisfied with the results. My stack ✔Kotlin, Java ✔Clean Architecture, MVVM, MVP ✔Coroutines, Live data, Databinding, Dagger2/Hilt, Room, Retrofit, Glide, Firebase, Payments Tools I use: ✔Android Studio ✔Sketch, Adobe Photoshop, Figma, Adobe Illustrator Have any questions? Want to discuss your projects? Feel free to contact me and have a nice day! :-)

Java
XML
Android SDK
Dagger 2
Android
Firebase Cloud Firestore
Android App Development
JetPack
Android Room Persistence
Multithreaded Programming
Push Notifications
Retrofit
Firebase
SQLite
Kotlin
Android Studio
$65 hourly
- 5.0/5
- (9 jobs)
If the machines 🦾 will rise from the ashes of the nuclear fire,I will be safe because they'll call me 𝗙𝗔𝗧𝗛𝗘𝗥😅 My portfolio includes projects, focused on building and integration AI/ML solutions for Fintech, Healthcare, E-commerce, Startups from scratch. 𝗪𝗵𝘆 𝗺𝗲: ● 10+ major projects in Banking, Fintech, E-commerce, Agriculture, Healthcare industries ● Award for the best Recommendation & Fraud detection system for E-commerce company by Michigan University ● R&D experience in NLP/CV field for Banking sector ● Experienced in leading 5 person engineering teams ● Strong business acumen 𝗟𝗼𝗼𝗸𝗶𝗻𝗴 𝗳𝗼𝗿 𝗰𝗼𝗻𝘁𝗶𝗻𝘂𝗼𝘂𝘀 𝗵𝗶𝗴𝗵-𝗶𝗺𝗽𝗮𝗰𝘁 𝗽𝗿𝗼𝗷𝗲𝗰𝘁𝘀 𝘄𝗶𝘁𝗵 𝗽𝗼𝘁𝗲𝗻𝘁𝗶𝗮𝗹. 𝗡𝗼𝘁 𝗶𝗻𝘁𝗲𝗿𝗲𝘀𝘁𝗲𝗱 𝗶𝗻 𝗱𝗲𝗲𝗽𝗳𝗮𝗸𝗲𝘀, 𝗮𝗱 𝗼𝗽𝘁𝗶𝗺𝗶𝘇𝗮𝘁𝗶𝗼𝗻 𝗼𝗳 𝘀𝗰𝗵𝗲𝗺𝗲𝘀 𝗮𝗻𝗱 𝗴𝗲𝗻𝗲𝗿𝗮𝘁𝗶𝗼𝗻 𝗼𝗳 𝗹𝗼𝘄-𝗾𝘂𝗮𝗹𝗶𝘁𝘆 𝗰𝗼𝗻𝘁𝗲𝗻𝘁 𝗲𝗻 𝗺𝗮𝘀𝘀𝗲. 𝗞𝗲𝘆 𝗖𝗼𝗺𝗽𝗲𝘁𝗲𝗻𝗰𝗶𝗲𝘀: ➣ Any integration of existing: LLMs models as GPT-3, GPT-4, LLaMA, LLaMA2. custom language model ➣ Natural Language Processing (NLP) - syntax, semantics, sentiment analysis, and computational linguistics. ➣ Computer Vision (CV) - OCR, pattern recognition, face, object recognition, and license plate recognition. These skills enabled me to deliver successful projects such as the Adaptive AI, Object detection and instance segmentation ➣ Building Smart Chatbots which can reply to customers and enhance the abilities of your support teams ➣ Generative AI: LLMs including GPT-3, GPT-4, LLaMA, LLaMA2 and launching custom language model, building complex chat-bots with multiple tools supporting, content generation, fine-tuning, quantinization. ➤ Programming Languages: -- Python, Java, SQL, C, C++, Octave ➤ Technologies and frameworks: -- TensorFlow, PyTorch, Numpy, Pandas, Keras, SciPy/SymPy, Spark, Tkinter Matplotlib, Plotly Express, Plotly Dash, Scikit-Learn, OpenCV/Pillow, Word2Vec, ETL procedures, FEM and its adaptive techniques, Monte Carlo simulations, Survival modeling, Pandemic modeling, Scrum, Kanban ➤Database layer: -- MySQL, SQL (MS SQL, Oracle, PostgresSQL, BigQuery), MS SQL, MongoDB, PostgreSQL, SAP HANA, SAP BW/4HANA, Impala, Snowflake ➤ OCR models: PaddleOCR, Rosetta, CRAZY, TextEAST, TextSR, RobustScanner, Table OCR, Table Structure Recognition, AWA, SAST, SRNet, Tesseract, OCRopus, Kraken, ABBYY FineReader, EasyOCR, Google Cloud Vision OCR, Amazon Textract, Microsoft Azure Cognitive Services OCR. ➤ Object detection: YOLOv5, Faster R-CNN, EfficientDet, RetinaNet, Custom Models Reach out to me by clicking the '𝗜𝗻𝘃𝗶𝘁𝗲 𝘁𝗼 𝗝𝗼𝗯' 𝗯𝘂𝘁𝘁𝗼𝗻 𝗮𝗻𝗱 𝗺𝗲𝗻𝘁𝗶𝗼𝗻𝗶𝗻𝗴 𝗽𝗿𝗼𝗺𝗼 "𝟭𝟭𝟭𝟭𝟬𝟭" so I can conduct a free 30 minute consultation, in he worst-case scenario, you will have received competent recommendations.

Java
API
Amazon Redshift
Data Visualization
Python Numpy FastAI
Back-End Development
RESTful API
OCR Software
Database Architecture
Amazon SageMaker
Python
Computer Vision
TensorFlow
Data Science
Machine Learning
$15 hourly
- 5.0/5
- (7 jobs)
The experience of working with Artem has been wonderful. Our team has benefited greatly from his constant devotion, technological proficiency, and commitment to quality. He constantly produces organised and effective code, which has been crucial to the accomplishment of our Android projects. Artem is a trustworthy team member, a real professional, and a fantastic communicator. We are really happy to collaborate with him — New Age Media ©️ Do you want to transform your Android app dreams into reality? 🚀 Have a solid, maintainable, bug-free application using the latest technology stack? 📱 Let's talk about how we can provide you with top-notch development services to ensure that your vision is realised and satisfies your needs ✨ I am an Android Developer with 5 years of diverse experience and bachelor's degree in software engineering. I've worked on applications with hundreds of thousands of users and in various areas such as driver's exams, streaming services, healthy eating, and even stores 👨🏻‍💻 When you work with me, you'll get: high code quality, absence of bugs, meeting criteria, and deadlines. These are my constant pillars 💯 Who do I work with? 👨🏻‍💼👩🏾‍💼 • Individual customers • Small teams • Startups • Enterprise companies • Other developers who need help or consulting How can I help you? 🤔 • Build an application from scratch • Implement new functionality into an existing application • Integrate third-party APIs and services • Troubleshoot and debug application problems • Boost the effectiveness and efficiency of the app • Update the app's design and user interface for a better user experience • Ensure that the app works with different Android versions and devices • Work together with designers, product managers, and other team members to ensure project success • Perform code reviews and offer feedback for improvement [TECHNOLOGY STACK] Kotlin/Java, Jetpack Compose, Dagger/Hilt/Koin, Coroutines, Retrofit, Room, Firebase, Glide, Navigation Component, In App Review, Work Manager, Paging, Data Store, JUnit 4/5, Espresso 🛠️ Send me a message with the specifics of your next project if you'd want to get started on it! 💬

Java
Unit Testing
Android Room Persistence
Retrofit
Dagger
Coroutine
Model View Intent
Model View ViewModel
Clean Architecture
Kotlin
Android SDK
Android
Android App Development
$29 hourly
- 5.0/5
- (7 jobs)
Are you looking for an experienced back-end developer? I’m ready to serve your business! My primary focus is delivering high-quality solutions to my clients and partners, with a commitment to quality and quick turnaround times. I have more than 7 years of experience, and I have accumulated and successfully applied the following knowledge and skills: Related skills: 🔹Python 🔹Django 🔹Golang 🔹Flask 🔹Fast API 🔹Web scraping/crawling 🔹SQL 🔹NoSQL 🔹MongoDB 🔹GraphQL 🔹Rest API 🔹Celery 🔹Redis I prefer long-term cooperation that allows me to entirely focus on the client's needs. So, tell me more about your project and I'll tell you how I can help with your business. With my skills and expertise, I am confident that I can provide you with the optimal solution you need to succeed. Let's work together to bring your idea to life! My other skills; Python programming language, Web Scraper, JavaScript, Flask, FastAPI, MongoDB, PostgreSQL, Cloudflare, Puppeteer, XPath, Headless browsing, Regular expressions, JSON parsing, HTML parsing, Web scraping bots, Crawling frameworks, Data storage solutions, Platform, Web Application Integration, Web App Development, Mobile App Development, MVP, Senior Python Developer, Python expert, Python/Django developer, Back-end Development, Backend Engineer, Backend Developer, Senior Backend Engineer, Automation Platform Development, AI Web APP, AI developer, AI-Powered, Django Expert, Web Developer, Website, API, Web Development, API Integration, Web Application, RESTful API, Artificial Intelligence, Machine Learning, Smartphone, Azure DevOps, Database Architecture, API Development, Solution Architecture, Database Maintenance, Mobile App, Firebase, Chat GPT Integration, E-commerce, Excel, GCP, Stripe, Payment gateways, CRM, SaaS, Financial, Medical, Healthcare, MedTech, Education, Real Estate, Social Media Integrations, Social Media App Development, Social Network, Geo, Location services, GPS, Maps, Map integration, Marketplace, EV Charging, Automotive, Logistics, Delivery, Food Ordering, FinTech, Banking, Dashboard, Insurance, LMS, ERP, EHR, HR system, Management platform, CSS, HTML, Microsoft, MS Office, Git, Amazon Web Services, MySQL, SQL, Full-Stack Development, NoSQL, Database Distributed Systems, Business Process Automation, DynamoDB, Third-party APIs, Twilio, Google Maps, Socket.IO, Software Development, Android App Development, Native App Development, iOS Development, MapBox, Redis, Celery, Firebase Cloud Firestore, SQLite, Data Scraping, Data Mining, Data Extraction, Web Crawler, Amazon S3, AWS, DigitalOcean, Bot Development, Database, Django framework, Browser Automation, Scrapy, Scrapy framework, Web Scraping, Selenium, Playwright, Python Script Automation, Beautiful Soup, Web Crawling, Scripting, Data Analysis, Data Visualization, Smartphone, Tablet, Push Notifications, Mobile SDK, Mobile Payments, Security, Data Privacy, Mobile Developer

Java
Flutter
React Native
Front-End Development
Mobile App Development
Python Script
Back-End Development Framework
Web Scraping
Back-End Development
Web Development
Web Application
JavaScript
Full-Stack Development
AWS Lambda
Python
MongoDB
Vue.js
Node.js
$15 hourly
- 5.0/5
- (19 jobs)
I'm a Kotlin/Java engineer with more than 3 years of experience. I'm specifically experienced in Android development using this tech stack: - Android SDK - Jetpack Compose - Kotlin/Java - Kotlin Coroutines, Flows - Hilt, Dagger2 In addition to my technical skills, I'm available 24/7 to answer questions, provide updates, and ensure that my clients are satisfied with the results. So if you're looking for an Android developer who can create top-notch apps that will delight your users, please don't hesitate to contact me.

Java
Model View Presenter
Bluetooth LE
Dagger 2
Model View ViewModel
Clean Architecture
Android Room Persistence
GitHub
Android SDK
Android App Development
Firebase
API Integration
Mobile App Development
Kotlin
Retrofit
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