Hire the Best REST API Developers
in the United States

Clients rate our REST API developers
Rating is 4.7 out of 5.
4.7/5
Based on 497 client reviews
Sen C.

Tacoma, Washington

$40/hr
5.0
64 jobs

If your data is stuck in the wrong system, in messy files, or behind an awkward API, I can help. I turn complex data problems into working systems and usable deliverables. I help clients move data between platforms, automate manual work, clean up unreliable exports, and build workflows that save time and reduce errors. Whether the deliverable is a program they can keep using, or a clean CSV, Excel file, report, or database, I can make it happen. Most of my work is API integrations, ETL pipelines, backend automation, data processing, and data migrations. I'm at my best when the problem is not clean or perfectly defined. I'll solve that problem first. I build data workflows that are meant to hold up in real use. I work with complex APIs, big JSON or XML data files, elaborate schema, folders full of CSV and Excel files, and large datasets where correctness matters. The result is a cleaner dataset, a dependable program, or a responsive and well-designed workflow. If you need a dependable program, a solid new system, or a clean final dataset, I can help.

  • REST API
  • API
  • Data Science
  • Python
  • MySQL
  • Data Processing
  • pandas
  • PostgreSQL
  • JSON
  • SQLite
  • Data Cleaning
  • Jupyter Notebook
  • CSV
  • SQL
  • XML
Mark R.

New York, New York

$70/hr
5.0
3 jobs

I build AI automation systems, SaaS platforms, and full-stack web applications using OpenAI/GPT, Python, FastAPI, and MERN stack to help businesses automate workflows, reduce manual work, and scale efficiently. ๐Ÿ‘จโ€๐Ÿ’ป About Me Iโ€™m a Full Stack Engineer and AI Automation Specialist focused on building production-grade AI-powered systems and scalable web applications for startups and growing businesses. My core strength is combining AI automation + backend engineering + full-stack development to deliver complete end-to-end digital products. I donโ€™t just build features โ€” I design systems that improve efficiency, automate operations, and support long-term business growth. ๐Ÿง  Core Expertise (AI & Automation) โœ… AI Automation Development โœ… OpenAI / GPT Integration (ChatGPT APIs) โœ… AI Agents & Conversational AI Systems โœ… AI Chatbots & Virtual Assistants โœ… Business Process Automation โœ… Workflow Automation & Optimization Keywords: AI automation, GPT integration, OpenAI developer, AI agent development, workflow automation, conversational AI ๐Ÿ’ป Full Stack Development โœ”๏ธ MERN Stack (MongoDB, Express, React, Node.js) โœ”๏ธ React.js & Next.js Frontend Development โœ”๏ธ Python & FastAPI Backend Development โœ”๏ธ REST API Development & Integration โœ”๏ธ SaaS Application Development โœ”๏ธ Database Design (MongoDB, PostgreSQL, MySQL) Keywords: full stack developer, MERN stack developer, React developer, Next.js, FastAPI, Node.js, SaaS development โš™๏ธ Backend & System Architecture โœ”๏ธ Scalable Backend Architecture โœ”๏ธ Microservices Development โœ”๏ธ Authentication (JWT, OAuth) โœ”๏ธ API Design & Integration โœ”๏ธ Performance Optimization Keywords: backend developer, API developer, microservices, scalable architecture, system design ๐Ÿ”— Automation & Integrations โœ”๏ธ CRM Integrations โœ”๏ธ Webhooks & API Automation โœ”๏ธ Third-Party Service Integration โœ”๏ธ Business Workflow Automation โœ”๏ธ SaaS System Automation Keywords: API integration, CRM automation, webhook developer, business automation systems โ˜๏ธ Deployment & DevOps โœ”๏ธ AWS Cloud Deployment โœ”๏ธ Docker Containerization โœ”๏ธ CI/CD Pipelines โœ”๏ธ Scalable Infrastructure Setup Keywords: AWS developer, DevOps, Docker, CI/CD, cloud deployment ๐Ÿ’ผ What I Help You Build โœ”๏ธ AI SaaS Platforms โœ”๏ธ AI Voice & Chat Agents โœ”๏ธ Business Automation Systems โœ”๏ธ Full Stack Web Applications โœ”๏ธ API-Based SaaS Products โœ”๏ธ Custom AI Solutions ๐ŸŒŸ Why Clients Choose Me โœ”๏ธ Senior-level engineering approach โœ”๏ธ Clean, scalable, production-ready code โœ”๏ธ Strong focus on business outcomes โœ”๏ธ End-to-end product development โœ”๏ธ Fast communication & reliable delivery โœ”๏ธ Long-term scalable architecture thinking ๐Ÿ“ฉ Letโ€™s Build Something Powerful If youโ€™re looking to build an AI-powered SaaS product, automation system, or scalable web application, I can help you turn your idea into a production-ready solution.

  • RESTful API
  • Python
  • FastAPI
  • AI Agent Development
  • Conversational AI
  • OpenAI API
  • Automation
  • Full-Stack Development
  • MERN Stack
  • Next.js
  • React
  • Node.js
  • SaaS Development
  • API Integration
  • MongoDB
John B.

Elkin, North Carolina

$90/hr
4.9
44 jobs

If your app is broken, behind schedule, or stuck with bugs you canโ€™t diagnose, I can help. Iโ€™m a senior full-stack developer with 30+ years of experience fixing, stabilizing, and finishing production systemsโ€”especially React, Node.js, APIs, and databases. Iโ€™m often brought in when: โ€ข A project is partially built but stuck โ€ข A previous developer disappeared โ€ข Bugs are blocking launch โ€ข APIs or integrations arenโ€™t working My focus is fast diagnosis, clear communication, and shipping fixesโ€”not rewrites. Iโ€™m a hands-on developer with 35 years of experience delivering production software across web, backend, and infrastructure systems. In recent work, Iโ€™ve been building and fixing applications using React, Node.js, MongoDB, and modern cloud environments. I also work with Web3 systems when needed, including Ethereum and Solana smart contracts, token integrations, and wallet-based workflows. With experience across many languages and platforms, I adapt quickly to the problem at hand and focus on getting things working reliably. Common fixes I handle: โ€ข API integrations that fail, timeout, or return incorrect data โ€ข Third-party API auth, webhooks, and data sync issues โ€ข React rendering, state, and performance issues โ€ข Node.js / Express backend errors and crashes โ€ข MongoDB schema, query, and data issues โ€ข Finishing half-built MVPs Iโ€™m available for short-term fixes or ongoing support.

  • API Development
  • PHP
  • AJAX
  • Amazon Web Services
  • JavaScript
  • Node.js
  • Linux System Administration
  • Product Development
  • Salesforce CRM
  • Enterprise Architecture
Bilal I.

Spring, Texas

$30/hr
5.0
2 jobs

Iโ€™m a Full Stack Developer with a strong focus on building scalable, high-performance web applications using the MERN (MongoDB, Express.js, React, Node js) stack and modern Python-based frameworks. My work centers on designing modular, maintainable systems with clean separation of concerns, efficient data flow, and production-grade performance. On the frontend, I develop dynamic single-page applications using React, leveraging component-driven architecture, hooks, and state management patterns (Context API, Redux). I prioritize performance optimization through code splitting, lazy loading, memoization, and efficient rendering strategies. I also ensure accessibility (ARIA standards) and responsive design using modern CSS methodologies (Flexbox, Grid, Tailwind, or SCSS). On the backend, I build robust APIs using both Node.js (Express) and Python frameworks such as Django, Flask, and FastAPI. I design RESTful and, where needed, GraphQL APIs with a focus on scalability, clean architecture (controller-service-repository patterns), and maintainability. I implement strong validation, authentication, and authorization mechanisms using JWT, OAuth, and session-based strategies, while ensuring high performance, proper error handling, and security best practices (rate limiting, input sanitization, CORS, etc.). For data management, I design and optimize MongoDB databases, including schema modeling, indexing strategies, aggregation pipelines, and performance tuning. Iโ€™m experienced with Mongoose ORM and understand data normalization vs. denormalization trade-offs, as well as handling large-scale datasets efficiently. I also work with real-time technologies such as WebSockets for live features like notifications and chat systems, and integrate third-party services (payment gateways, cloud storage, external APIs) into applications. Beyond JavaScript stacks, I specialize in advanced WordPress customization and development. This includes building custom themes from scratch, extending functionality via custom plugins, working with the WordPress REST API, and modifying core behavior using hooks (actions & filters). I optimize WordPress sites for performance (caching strategies, database optimization, asset minification) and ensure security hardening and SEO best practices. Iโ€™m also comfortable integrating headless WordPress setups with React frontends. I follow modern DevOps and development workflows, including: Git-based version control with branching strategies (Git Flow) CI/CD pipelines for automated testing and deployment Containerization with Docker (where applicable) Cloud deployment (AWS, Vercel, Netlify, or similar platforms) Environment configuration and secrets management Core Technical Competencies: Frontend: React, JavaScript (ES6+), TypeScript, HTML5, CSS3, Tailwind, SCSS Backend: Node js, Express js, Python, Django, Flask, FastAPI, REST APIs, GraphQL Database: MongoDB, Mongoose, aggregation & indexing Authentication: JWT, OAuth, session-based auth Real-Time: WebSockets, Socket io WordPress: Custom Themes, Plugin Development, REST API, Hooks (Actions/Filters) DevOps & Tools: Git, Docker, CI/CD, Linux, Nginx Performance & Security: Caching, lazy loading, rate limiting, XSS/CSRF protection I write clean, scalable code and communicate clearly throughout the project to ensure everything is delivered on time and meets expectations. Updated Skill Tags: MERN Stack Developer Full Stack Developer React Developer Node.js Developer Python Developer Django Developer Flask Developer FastAPI Developer JavaScript Developer Web Application Development REST API Development API Integration MongoDB Express.js Frontend Developer Backend Developer TypeScript Responsive Web Design WordPress Developer WordPress Customization WordPress Theme Development WordPress Plugin Development WooCommerce Website Performance Optimization Bug Fixing Website Development Git / Version Control SEO Optimization

  • REST API
  • MERN Stack
  • Full-Stack Development
  • React
  • Node.js
  • Web Application
  • API Integration
  • MongoDB
  • ExpressJS
  • Front-End Development
  • Back-End Development
  • TypeScript
  • WordPress Customization
  • WooCommerce
  • GitHub
  • Elementor
  • Python
  • Django
  • Flask
  • FastAPI
Keysha H.

Missouri City, Texas

$40/hr
5.0
4 jobs

๐Ÿš€ Results-Driven Web Developer with strong expertise in Python, Django, Flask, full-stack web development, backend engineering, API integration, and embedded systems. I help startups, businesses, and entrepreneurs turn ideas into scalable, secure, and high-performance applications. With a deep understanding of modern web technologies, clean architecture, and performance optimization, I deliver production-ready solutions that are easy to maintain and scale. ๐Ÿ”น Core Skills & Technologies Backend Development Python Programming Django (REST Framework, ORM, Authentication, Middleware) Flask (Microservices, REST APIs) FastAPI RESTful API Development GraphQL Microservices Architecture Asynchronous Programming Frontend & Design Integration HTML5, CSS3, JavaScript (ES6+) Responsive Web Design Bootstrap, Tailwind CSS React.js (basic integration) UI/UX Design Implementation Figma / Adobe XD to Code Cross-Browser Compatibility Databases & Storage PostgreSQL MySQL SQLite MongoDB Redis Database Design & Optimization API & Third-Party Integrations Payment Gateways (Stripe, PayPal) OAuth & Social Login Google APIs SMS / Email APIs Webhooks External REST API Integration DevOps & Deployment Docker & Containerization CI/CD Pipelines AWS, DigitalOcean, Heroku Linux Server Administration Nginx, Gunicorn Cloud Deployment & Scaling Embedded Systems & IoT Embedded Python Microcontrollers (Arduino, ESP32, Raspberry Pi) IoT Web Dashboards Hardware-Software Integration Sensor Data Processing Serial Communication ๐Ÿ”น What I Can Build for You โœ… Custom Web Applications โœ… Python Django & Flask Websites โœ… REST APIs & Backend Systems โœ… SaaS Platforms โœ… Admin Dashboards โœ… Embedded-Web Integrated Systems โœ… Automation & Scripts โœ… API Development & Integration โœ… Bug Fixing & Performance Optimization โœ… Database Design & Migration ๐Ÿ”น Why Clients Choose Me โœ” Clean, scalable & secure code โœ” SEO-friendly and performance-optimized apps โœ” Clear communication & fast response โœ” On-time delivery with regular updates โœ” Long-term support & maintenance โœ” Business-focused solutions I follow best coding practices, write well-documented code, and always prioritize security, speed, and scalability. NB: My work covers all these and is not limited to: Python Developer | Django Developer | Flask Developer | Web Developer | Full Stack Developer | Backend Developer | REST API Developer | API Integration | SaaS Developer | Embedded Systems Developer | IoT Developer | Microservices | Database Design | PostgreSQL | MySQL | MongoDB | Cloud Deployment | AWS Developer | Docker | Linux | Automation | Web Application Development | Software Engineer | Custom Web Development | Python Automation | Embedded Python | Hardware Integration

  • Python
  • Python Script
  • Machine Learning
  • Deep Learning
  • Machine Learning Model
  • Web Design
  • Software Development
  • JavaScript
  • Cloud Computing
  • C
  • Django
  • MySQL Programming
  • Computer Science
  • Raspberry Pi
  • WordPress Development
Gabriel D.

Colquitt, Georgia

$20/hr
4.4
107 jobs

WANT A WEB APPLICATION THAT LOOKS GREAT, PERFORMS FAST, AND ACTUALLY SOLVES REAL BUSINESS PROBLEMS? YOU ARE IN THE RIGHT PLACE. I'm a Full Stack Developer & Backend Engineer specializing in React, Next.js, Node.js, Python, Go, FastAPI, and Django, building scalable SaaS platforms, AI-powered applications, DevOps pipelines, and high-performance web and mobile apps for startups, growing businesses, and ambitious founders. You bring the vision. I build the product: frontend to backend, cloud deployment to AI automation. FULL STACK & BACKEND SERVICES I OFFER โœ… Full Stack Web Application Development โœ… Frontend Development (React, Next.js, Responsive UI/UX) โœ… Backend Development (Node.js, Python, Go, FastAPI, Django, NestJS) โœ… REST API & GraphQL Development โœ… Microservices & Serverless Architecture โœ… SaaS Platform Development โœ… AI Integration, LLM-Powered Apps & AI Agent Workflows โœ… MVP Development for Startups โœ… Mobile App Development (Flutter, React Native) โœ… DevOps, CI/CD Pipelines & Cloud Deployment โœ… Database Design (PostgreSQL, MySQL, MongoDB, Redis, Firebase) โœ… Docker, Kubernetes & Container Orchestration โœ… AWS, GCP & Azure Cloud Infrastructure โœ… Payment Gateway & Third-Party API Integration โœ… Ongoing Support & Maintenance WHAT I DELIVER โœ” React & Next.js Frontend: Fast, responsive, conversion-focused interfaces built for real users โœ” Node.js, Python & Go Backend: Scalable server-side logic, clean APIs, and secure data handling โœ” FastAPI & Django Systems: High-performance Python backends built for speed and reliability โœ” DevOps & Cloud Automation: Docker, Kubernetes, GitHub Actions CI/CD, AWS Lambda, ECS, EC2 โœ” SaaS & Web App Development: End-to-end platforms designed to grow with your business โœ” AI Agents & LLM Integration: Customer support bots, HR assistants, sales automation, RAG systems, OpenAI API workflows โœ” Mobile Apps: Cross-platform Flutter & React Native apps โœ” MVP Builds: From idea to working product, fast and lean โœ” Clean, Scalable Architecture: Microservices, serverless, and cloud-ready systems AI WORKFLOW AUTOMATIONS I BUILD โœ” Customer Support: Chatbots & Voice Assistants โœ” HR: AI Recruiters & Policy Assistants โœ” Sales & Marketing: Lead Scorers & Chat-to-Lead Converters โœ” Operations: Schedulers & Report Generators โœ” Finance: Invoice Bots & Forecast Models โœ” Data & Product: AI Analytics Agents & Anomaly Detectors WHO I WORK WITH 1. Startups building their first product or MVP 2. Founders who need a technical partner, not just a coder 3. Businesses scaling their SaaS platform 4. Teams integrating AI agents into existing operations 5. Companies needing DevOps, cloud infrastructure, or automation 6. Agencies needing reliable full stack execution WHY CLIENTS CHOOSE ME โœ” Full Stack + Backend + DevOps in one developer โœ” React, Node.js, Python & Go: rare multi-stack expertise โœ” AI-Ready: LLM integration, AI agents, and automation workflows โœ” DevOps Mindset: deploy once, monitor always, scale effortlessly โœ” Business-Focused: I think about your users and goals, not just the code โœ” Clean, Documented, Production-Quality Code โœ” Clear Communication & Reliable Delivery I don't just write code. I build products that work, scale, and deliver value from day one. LET'S BUILD SOMETHING GREAT If you need a Full Stack Developer, Backend Engineer, or DevOps expert who can handle everything from React frontends and Python/Go backends to AI automation and cloud deployments, let's talk. ๐Ÿ“ฉ Send me a message today and let's turn your idea into a working, scalable product. Best regards, Gabriel Daramola Full Stack Developer | Backend Engineer & DevOps | React, Next.js, Node.js, Python, Go | SaaS, AI & Cloud React, Next.js, Node.js, Python, FastAPI, Django, TypeScript, JavaScript, Full Stack Developer, Backend Developer, Frontend Developer, Backend Engineer, API Engineer, Senior Developer, SaaS, MVP, AI Integration, LLMs, RAG, OpenAI API, LangChain, AI Agents, Scalable Systems, REST API, GraphQL, Microservices, Serverless, Docker, Kubernetes, AWS, CI/CD, PostgreSQL, MongoDB, Redis, Firebase, DevOps, Cloud Deployment, GitHub Actions, System Architecture, Web & Mobile Dev, Flutter, React Native, Go, Golang, NestJS, Express.js, Flask, Gin, Fiber, Echo, Django, FastAPI, SQLAlchemy, Prisma, tRPC, Vue.js, Nuxt.js, Svelte, SvelteKit, TailwindCSS, Material UI, Chakra UI, shadcn/ui, Expo, PWA, Webpack, Vite, Responsive Design, UI/UX, Web Performance, Core Web Vitals, MySQL, Firestore, Supabase, PlanetScale, DynamoDB, Elasticsearch, Cassandra, SQLite, CockroachDB, Neon, Vector DB, Pinecone, Weaviate, ChromaDB, Qdrant, GCP, Azure, Lambda, EC2, ECS, S3, RDS, CloudFront, Vercel, Netlify, Railway, Render, Heroku, GitLab CI, Jenkins, CircleCI, Terraform, Ansible, Nginx, Linux, Bash, Shell Scripting, Prometheus, Grafana, ELK Stack, Datadog, Sentry, Cloudflare, Claude API, Gemini API, LlamaIndex, Hugging Face, Chatbots, Voice Assistants, Automation, Custom AI, AI-Driven Systems, Whisper

  • Webflow
  • WordPress
  • Shopify
  • Squarespace
  • Wix
  • WordPress Development
  • Mobile App Development
  • Flutter
  • Golang
  • NodeJS Framework
  • Flask
  • Django
  • FastAPI
  • Python
  • Build Automation

How it works

Post a job for free Post a job

Tell us what you need. Create your own job post or generate one with AI then filter talent matches.

Hire top talent fast

Consult, interview, and hire quickly, so you can meet the freelancers you're excited about.

Collaborate easily

Use Upwork to chat or video call, share files, and track project progress right from the app.

Payment simplified

Manage payments in one place with flexible billing options. Only pay for approved work, hourly or by milestone.

Don't just take our word for it

How do I hire a REST API Developer in the United States on Upwork?

You can hire a REST API Developer in the United States on Upwork in four simple steps:

  • Create a job post tailored to your REST API Developer project scope. We'll walk you through the process step by step.
  • Browse top REST API Developer talent on Upwork and invite them to your project.
  • Once the proposals start flowing in, create a shortlist of top REST API Developer profiles and interview.
  • Hire the right REST API Developer for your project from Upwork, the world's largest work marketplace.

At Upwork, we believe talent staffing should be easy.

How much does it cost to hire a REST API Developer?

Rates charged by REST API Developers on Upwork can vary with a number of factors including experience, location, and market conditions. See hourly rates for in-demand skills on Upwork.

Why hire a REST API Developer in the United States on Upwork?

As the world's work marketplace, we connect highly-skilled freelance REST API Developers and businesses and help them build trusted, long-term relationships so they can achieve more together. Let us help you build the dream REST API Developer team you need to succeed.

Can I hire a REST API Developer in the United States within 24 hours on Upwork?

Depending on availability and the quality of your job post, it's entirely possible to sign up for Upwork and receive REST API Developer proposals within 24 hours of posting a job description.