Hire the Best Backend Rest API Freelancers
in the United States

Clients rate our Backend Rest API professionals
Rating is 4.8 out of 5.
4.8/5
Based on 489 client reviews
Sen C.

Tacoma, Washington

$45/hr
5.0
66 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
  • Python
  • MySQL
  • pandas
  • PostgreSQL
  • SQLite
  • SQL
  • XML
  • Data Science
  • Data Processing
  • JSON
  • Data Cleaning
  • Jupyter Notebook
  • CSV
Mir W.

Braintree, Massachusetts

$40/hr
4.8
230 jobs

๐™๐™ช๐™ก๐™ก ๐™Ž๐™ฉ๐™–๐™˜๐™  ๐˜ฟ๐™š๐™ซ๐™š๐™ก๐™ค๐™ฅ๐™š๐™ง ๐™›๐™ค๐™ง ๐™Ž๐™–๐™–๐™Ž, ๐™ˆ๐™‘๐™‹๐™จ, ๐™ฌ๐™š๐™— ๐™–๐™ฅ๐™ฅ๐™จ, ๐™™๐™–๐™จ๐™๐™—๐™ค๐™–๐™ง๐™™๐™จ, ๐™–๐™ฃ๐™™ ๐™˜๐™ช๐™จ๐™ฉ๐™ค๐™ข ๐™—๐™ช๐™จ๐™ž๐™ฃ๐™š๐™จ๐™จ ๐™ฅ๐™ก๐™–๐™ฉ๐™›๐™ค๐™ง๐™ข๐™จ. Need someone who can connect your frontend, backend, database, APIs, and third-party tools without making the development process complicated? ๐Ÿ‘จโ€๐Ÿ’ป Full Stack Developer using React, Next.js, Node.js, PHP, and MySQL ๐Ÿš€ SaaS development, MVP development, and custom web applications ๐Ÿ”— REST API development, payment integrations, and third-party APIs ๐Ÿ›  New product development, feature additions, debugging, and code improvements ๐Ÿ“ฑ Responsive web applications for desktop, tablet, and mobile ๐Ÿค Direct communication with regular project updates I help founders, startups, agencies, and businesses turn product ideas into working web applications. I can join at the planning stage, continue an existing build, fix an unfinished application, or add new features to a live product. You are not hiring separate people for every part of the project. Frontend development, backend development, database work, API integrations, testing, and deployment can all be managed within one development process. ๐—›๐—ฒ๐—ฟ๐—ฒโ€™๐˜€ ๐˜„๐—ต๐—ฎ๐˜ ๐—œ ๐—ฐ๐—ฎ๐—ป ๐—ต๐—ฒ๐—น๐—ฝ ๐˜†๐—ผ๐˜‚ ๐—ฏ๐˜‚๐—ถ๐—น๐—ฑ ๐Ÿญ. ๐—™๐˜‚๐—น๐—น ๐—ฆ๐˜๐—ฎ๐—ฐ๐—ธ ๐—ช๐—ฒ๐—ฏ ๐——๐—ฒ๐˜ƒ๐—ฒ๐—น๐—ผ๐—ฝ๐—บ๐—ฒ๐—ป๐˜ ๐Ÿ”น Custom web application development from idea to launch ๐Ÿ”น Frontend, backend, database, and API development ๐Ÿ”น SaaS platforms, MVPs, portals, and internal business applications ๐Ÿ”น New feature development for existing web applications ๐Ÿ”น Testing, deployment, maintenance, and future improvements ๐Ÿฎ. ๐—ฅ๐—ฒ๐—ฎ๐—ฐ๐˜ ๐—ฎ๐—ป๐—ฑ ๐—ก๐—ฒ๐˜…๐˜.๐—ท๐˜€ ๐——๐—ฒ๐˜ƒ๐—ฒ๐—น๐—ผ๐—ฝ๐—บ๐—ฒ๐—ป๐˜ ๐Ÿ”น React.js and Next.js web application development ๐Ÿ”น SaaS dashboards, admin panels, and customer portals ๐Ÿ”น Figma to React or Next.js development ๐Ÿ”น Responsive frontend development ๐Ÿ”น API-connected pages with search, filters, forms, and live data ๐Ÿ”น Server-side rendering and frontend performance improvements ๐Ÿฏ. ๐—ก๐—ผ๐—ฑ๐—ฒ.๐—ท๐˜€ ๐—•๐—ฎ๐—ฐ๐—ธ๐—ฒ๐—ป๐—ฑ ๐——๐—ฒ๐˜ƒ๐—ฒ๐—น๐—ผ๐—ฝ๐—บ๐—ฒ๐—ป๐˜ ๐Ÿ”น Node.js and Express.js backend development ๐Ÿ”น REST API development and API integration ๐Ÿ”น User authentication and account management ๐Ÿ”น Admin, customer, vendor, and staff permissions ๐Ÿ”น Payment processing, subscriptions, and webhooks ๐Ÿ”น Custom business logic and automated workflows ๐Ÿฐ. ๐—ฃ๐—›๐—ฃ ๐—ฎ๐—ป๐—ฑ ๐— ๐˜†๐—ฆ๐—ค๐—Ÿ ๐——๐—ฒ๐˜ƒ๐—ฒ๐—น๐—ผ๐—ฝ๐—บ๐—ฒ๐—ป๐˜ ๐Ÿ”น Custom PHP web application development ๐Ÿ”น PHP and MySQL backend development ๐Ÿ”น Database-driven websites and business platforms ๐Ÿ”น Existing PHP application updates ๐Ÿ”น MySQL database planning and query improvements ๐Ÿ”น PHP bug fixing and feature development ๐Ÿฑ. ๐—ฆ๐—ฎ๐—ฎ๐—ฆ ๐—ฎ๐—ป๐—ฑ ๐— ๐—ฉ๐—ฃ ๐——๐—ฒ๐˜ƒ๐—ฒ๐—น๐—ผ๐—ฝ๐—บ๐—ฒ๐—ป๐˜ ๐Ÿ”น SaaS product development for startups and businesses ๐Ÿ”น MVP development for testing new product ideas ๐Ÿ”น Subscription plans and recurring payments ๐Ÿ”น User onboarding, dashboards, and account settings ๐Ÿ”น Admin controls for users, payments, content, and reports ๐Ÿ”น Product improvements based on customer feedback ๐Ÿฒ. ๐—”๐—ฃ๐—œ ๐—ฎ๐—ป๐—ฑ ๐—ง๐—ต๐—ถ๐—ฟ๐—ฑ-๐—ฃ๐—ฎ๐—ฟ๐˜๐˜† ๐—œ๐—ป๐˜๐—ฒ๐—ด๐—ฟ๐—ฎ๐˜๐—ถ๐—ผ๐—ป๐˜€ ๐Ÿ”น REST API development ๐Ÿ”น Third-party API integration ๐Ÿ”น Stripe and PayPal payment integration ๐Ÿ”น CRM, email, maps, analytics, and automation integrations ๐Ÿ”น Webhook setup and data synchronization ๐Ÿ”น Connecting web applications with external platforms ๐Ÿณ. ๐—•๐˜‚๐—ด ๐—™๐—ถ๐˜…๐—ถ๐—ป๐—ด ๐—ฎ๐—ป๐—ฑ ๐—˜๐˜…๐—ถ๐˜€๐˜๐—ถ๐—ป๐—ด ๐—ช๐—ฒ๐—ฏ ๐—”๐—ฝ๐—ฝ๐˜€ ๐Ÿ”น React, Next.js, Node.js, PHP, and MySQL bug fixing ๐Ÿ”น Completing unfinished web applications ๐Ÿ”น Fixing frontend, backend, API, and database problems ๐Ÿ”น Adding features to existing products ๐Ÿ”น Improving page speed and application performance ๐Ÿ”น Updating older code without unnecessary rebuilding ๐—–๐—ผ๐—บ๐—บ๐—ผ๐—ป ๐—ฝ๐—ฟ๐—ผ๐—ท๐—ฒ๐—ฐ๐˜๐˜€ โœ“ SaaS application development โœ“ MVP development โœ“ Custom web applications โœ“ Business dashboards โœ“ Admin panels โœ“ Customer portals โœ“ Membership platforms โœ“ Subscription-based applications โœ“ Ecommerce web applications โœ“ Marketplace platforms โœ“ Booking applications โœ“ CRM applications โœ“ REST API development โœ“ Payment gateway integration โœ“ React and Next.js development โœ“ Node.js backend development โœ“ PHP and MySQL development ๐—ง๐—ฒ๐—ฐ๐—ต๐—ป๐—ผ๐—น๐—ผ๐—ด๐—ถ๐—ฒ๐˜€ โœ“ React.js โœ“ Next.js โœ“ Node.js โœ“ Express.js โœ“ PHP โœ“ MySQL โœ“ PostgreSQL โœ“ JavaScript โœ“ TypeScript โœ“ HTML5 โœ“ CSS3 โœ“ Tailwind CSS โœ“ Bootstrap โœ“ REST APIs โœ“ Supabase โœ“ Git and GitHub โœ“ Vercel โœ“ AWS โœ“ Third-party APIs โœ“ Webhooks ๐—ช๐—ต๐—ฎ๐˜ ๐˜†๐—ผ๐˜‚ ๐—ฐ๐—ฎ๐—ป ๐—ฒ๐˜…๐—ฝ๐—ฒ๐—ฐ๐˜ You will receive regular updates and straightforward explanations throughout the project. You will know what has been completed, what is currently being developed, and what comes next. I also look at the product from a user and business perspective. When a requirement can be improved or simplified, I will discuss the option with you before development continues. ๐™„๐™› ๐™ฎ๐™ค๐™ช ๐™ฃ๐™š๐™š๐™™ ๐™– ๐™๐™ช๐™ก๐™ก ๐™Ž๐™ฉ๐™–๐™˜๐™  ๐˜ฟ๐™š๐™ซ๐™š๐™ก๐™ค๐™ฅ๐™š๐™ง ๐™›๐™ค๐™ง ๐™– ๐™Ž๐™–๐™–๐™Ž ๐™ฅ๐™ก๐™–๐™ฉ๐™›๐™ค๐™ง๐™ข, ๐™ˆ๐™‘๐™‹, ๐™˜๐™ช๐™จ๐™ฉ๐™ค๐™ข ๐™ฌ๐™š๐™— ๐™–๐™ฅ๐™ฅ, ๐™ค๐™ง ๐™–๐™ฃ ๐™š๐™ญ๐™ž๐™จ๐™ฉ๐™ž๐™ฃ๐™œ ๐™ฅ๐™ง๐™ค๐™™๐™ช๐™˜๐™ฉ, ๐™จ๐™š๐™ฃ๐™™ ๐™ข๐™š ๐™– ๐™ข๐™š๐™จ๐™จ๐™–๐™œ๐™š.

  • Front-End Development
  • API
  • Mobile App Design
  • Webflow
  • Laravel
  • React
  • Back-End Development
  • Node.js
  • Shopify
  • Python
  • PHP
  • Web Application
  • WordPress
  • Stripe
  • JavaScript
Fahad K.

West Bloomfield Township, Michigan

$30/hr
4.8
206 jobs

๐Ÿ‘‹ Hi, I'm Fahad Khan I build high-performance Flutter apps, native iOS & Android applications, and professional websites for startups and growing businesses that need to launch fast โ€” without sacrificing scalability, security, or code quality. With 100+ projects delivered and a 100% Job Success Score, I help founders, product teams, and businesses turn ideas into reliable, revenue-generating digital products โ€” whether that's a cross-platform mobile app, a native iOS/Android application, or a conversion-optimized website. ๐Ÿ“ฑ Mobile App Development (Flutter | iOS | Android) Most mobile apps fail not because of UI โ€” but because of weak backend logic and poor system design. That's where my background becomes a strength. I build Flutter, native iOS (Swift/SwiftUI), and Android (Kotlin/Java) apps that integrate with secure backends, REST APIs, and admin dashboards โ€” making your app the execution layer of a complete product, not just a standalone front end. โœ… Flutter โ€” cross-platform iOS & Android from a single codebase โœ… Native iOS โ€” Swift, SwiftUI, Xcode, App Store deployment โœ… Native Android โ€” Kotlin, Java, Google Play deployment โœ… Startup MVPs โ€” validate your idea fast โœ… Business & internal apps with real workflows โœ… Customer-facing production-ready apps โœ… Firebase, Supabase, Node.js & Laravel backend integration โœ… Push notifications, payments (Stripe, in-app purchases), maps & more โœ… App Store & Google Play submission & optimization โœ… Clean, scalable architecture built for long-term growth ๐ŸŒ Web Development & Design I'm also a full-stack web developer with deep expertise across modern web technologies โ€” delivering fast, secure, and visually compelling websites that rank on Google and convert visitors into customers. My web stack includes: WordPress โ€” custom themes, plugins, WooCommerce, e-commerce migrations Laravel & PHP โ€” robust backend systems, custom web applications React.js โ€” dynamic, component-driven frontend development Webflow โ€” pixel-perfect no-code/low-code builds with complex interactions HTML, CSS, JavaScript โ€” clean, standards-compliant code across every project โœ… Website cloning, redesigns & brand refreshes โœ… E-commerce stores (WooCommerce, Shopify migration) โœ… SEO-optimized, mobile-responsive layouts โœ… Speed optimization & Core Web Vitals improvement โœ… Complex Webflow features & custom interactions โœ… API integrations & third-party service connections ๐ŸŽฏ What You Get Working With Me ๐Ÿ“ฆ Clean, maintainable code โ€” easy to hand off or scale ๐Ÿ—๏ธ Scalable architecture that grows with your business ๐Ÿ“… Clear milestones, realistic timelines, zero surprises ๐Ÿ” SEO best practices built into every web project ๐Ÿ“ฒ App Store & Play Store optimization (ASO) ๐Ÿค A product-focused partner โ€” not just a task executor ๐Ÿ‘ฅ Industries I've Served E-commerce โ€ข SaaS โ€ข Healthcare โ€ข Real Estate โ€ข Education โ€ข Hospitality โ€ข Fintech โ€ข Retail Whether you need a Flutter app that scales, a native iOS or Android app, a WordPress site that ranks, or a complete digital product from idea to launch โ€” Let's build something that actually works in the real world. LET'S TALK! ๐Ÿš€

  • REST API
  • Flutter
  • Dart
  • Mobile App Development
  • Mobile App Design
  • iOS Development
  • Android App
  • In-App Advertising
  • AI App Development
  • App Development
  • Firebase
  • User Authentication
  • Payment Gateway Integration
  • App Design
  • In-App Subscription
Louise L.

Pembroke Pines, Florida

$100/hr
4.9
73 jobs

Twelve years writing code, two of them running product at MotionArray, where I led the team through its acquisition by Artlist in 2020. I build the thing, I know why the business wants it built, and when the work outgrows one person I have 30 engineers behind me. Most profiles here offer one of those three. What I do hands-on Frontend and full-stack in Angular, Vue, React, Next, Nuxt and Capacitor, with Node, Laravel, PHP and C# behind it. Shipped and maintained bikeflights, skilltrakker and myhrconfidant . Comfortable in codebases somebody else wrote and abandoned, which is most of what I get asked for. AI, specifically I'm a founding engineer at BuildBetter.ai, an AI product platform used by B2B teams that turns call recordings, tickets and support conversations into structured, cited deliverables. The work is the unglamorous part of shipping AI: retrieval over a company's own documents so answers are grounded instead of plausible, structured extraction from messy input, and the evaluation and cost work that decides whether a feature survives real usage. Most products don't need a model, they need the right context reaching one. I'll tell you which you're dealing with before you spend money finding out. The team behind me I founded and run Roraima Devs, a U.S. LLC with 30+ engineers across the U.S., Colombia, Argentina, Venezuela and the Dominican Republic. 15+ clients, many with us 3+ years, 9 years on Upwork, 6 years as a U.S. company. Reviews under Roraima Devs on Trustpilot. What that means for you: I take the work I can do well myself, and when a project needs frontend, backend, mobile and DevOps moving at once, I can staff it in parallel instead of stretching one timeline into six months. You decide which shape you want, and you always know exactly who is touching your code before it happens. Larger scopes can run through the agency contract if that suits you better. How I work I ask questions before estimating. If your idea has a cheaper path than the one you arrived with, I'll say so on the first call. If I'm not the right fit, I'll say that too. Start with a 30-minute call and we'll look at what you have.

  • PHP
  • Node.js
  • JavaScript
  • Laravel
  • ASP.NET
  • React
  • Vue.js
  • AI Bot
  • WordPress
  • PostgreSQL
  • Oracle
  • Software Development
  • Mobile App Development
  • Angular
  • MySQL
Waqas A.

Frederick, Maryland

$25/hr
5.0
8 jobs

Top Rated Plus Full Stack Developer with 9+ years of experience building scalable SaaS platforms, mobile apps, and AI-powered solutions. I deliver production-ready web and mobile applications from concept to deployment. I help startups and businesses launch and scale modern applications that don't just work, they grow with them. Whether you need a full-stack web platform, cross-mobile app, or AI automation system, I own the entire development lifecycle. โ˜‘๏ธ What I Build: โ€ข SaaS Platforms โ€“ Multi-tenant architectures, subscription systems, admin dashboards โ€ข Mobile Apps โ€“ React Native & Expo for iOS/Android with offline support and push notifications โ€ข Web Applications โ€“ Next.js frontends with Node.js backends, REST/GraphQL APIs โ€ข AI Integration โ€“ OpenAI/Claude integrations, workflow automation, document processing โ€ข E-commerce & Payments โ€“ Stripe, PayPal, payment gateways, secure transactions โ˜‘๏ธ Technical Expertise: โ€ข Frontend: React, Next.js, TypeScript, Tailwind CSS, Expo โ€ข Backend: Node.js, Laravel, Express.js, REST/GraphQL APIs โ€ข Mobile: React Native, Expo, iOS/Android deployment โ€ข Database: PostgreSQL, MongoDB, Firebase, Supabase โ€ข Cloud & DevOps: AWS, Vercel, Docker, CI/CD pipelines โ˜‘๏ธ Why Work With Me: โ€ข Top Rated Plus with 100% Job Success Score โ€ข 9+ years of production-grade development experience โ€ข Full ownership โ€“ design to deployment, no handoffs โ€ข Clear communication โ€“ weekly updates, transparent timelines โ€ข Fast turnaround โ€“ MVPs in weeks, not months ๐Ÿ’ก Free Consultation: I offer a free 30-minute discovery call to discuss your project scope, technical approach, and timeline. Let's turn your idea into a scalable product. Ready to build? Click "Hire Now" or send me an invitation to chat.

  • REST API
  • React Native
  • Mobile App Development
  • Web Application Development
  • Next.js
  • Full-Stack Development
  • React
  • Node.js
  • TypeScript
  • JavaScript
  • Firebase
  • API Integration
  • Tailwind CSS
  • PostgreSQL
  • Amazon Web Services
  • iOS Development
  • iOS
  • Android App Development
  • Push Notifications
  • Laravel
Eric M.

Castle Rock, Colorado

$100/hr
4.9
169 jobs

I solve tech problems that don't have obvious solutions. I work in the land of "where do we even start," "I have this idea but I don't know what to do with it," and more commonly the past few years "I have this plan from an AI, will it work, how do I actually build it?" If you've had those experiences, send me a message. In the past 15 years I've solved data problems, automation problems, pipeline problems, scaling problems. I've solved government databases like EDGAR or SBA being insufficient, I've solved non-profit workflows being inefficient. I've solved "what kind of orchid is this?" and "how many people are watching our content across 4 social media platforms?" I can help you ideate on why a solution is good and how it scales, pitfalls to avoid, caveats, tradeoffs. I can be a stand-in CTO who makes tech decisions for a special project. I can solve a single piece of your pipeline or manifest the entire idea into something functional, measurable, and scalable. In 15 years I've wired up thousands of API integrations, automations, and data pipelines. I've been using AI the past few years where it makes sense and keeping the human in the loop where it doesn't. I can help you figure that out too for your business or idea.

  • API Development
  • API Integration
  • Automation
  • Python
  • JavaScript
  • Data Scraping
  • Web Scraping
  • Data Engineering
  • Amazon Web Services
  • Cloudflare
  • Generative AI
  • Startup Consulting
  • Software Architecture & Design
  • IT Consultation

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