RESTful API stands for Representational State Transfer Application Programming Interface, a term coined by Roy Fielding in 2000. A RESTful API allows an application to communicate with other applications. It is based on the structure of a website, where the data and information are stored in the form of resources. RESTful APIs make use of these resources to provide a certain level of accessibility and data exchange between different systems. This makes web development more efficient, as resources can be accessed easily and quickly.

A RESTful API Developer is responsible for designing and developing APIs to facilitate communication between different applications. The Developer will use their existing skills in web development to create APIs that are secure and reliable, that can provide clients with the ability to access resources for different types of usage. The Developer will also ensure that the APIs are well documented so that any updates or changes to their backend programming environment don't cause any disruptions with existing communication workflows.

Here's some projects that our expert RESTful API Developer made real:

  • Creating browser extensions using Microsoft Graph API
  • Building webpages for flight searches & results
  • Developing applications for React Native in PHP
  • Retrieving data through various APIs, presenting it in a table format & sending email notifications
  • Developing & integrating simple authentication functions into Laravel apps
  • Integrating WordPress REST APIs into mobile apps via PHP
  • Building middleware systems to convert HTTP GET requests into REST calls
  • Developing programs in C# .NET using the WordPressPCL Package Library
  • Developing cloud services programs using Cloud Flare's API
  • Creating tools to trigger Customer orders with CSV file uploads

At Freelancer.com, our RESTful API Developers are highly experienced professionals dedicated to delivering innovative solutions that meet our clients' specific needs! Our Developers have successfully completed various projects for a wide range of clients, enabling quick and secure data exchange between applications. If you’re looking for an experienced developer to create an efficient, reliable and secure API system, then post your project now and hire the most suitable API developer here on Freelancer.com!

From 111,974 reviews, clients rate our RESTful API Developers 4.9 out of 5 stars.
Hire RESTful API Developers

RESTful API stands for Representational State Transfer Application Programming Interface, a term coined by Roy Fielding in 2000. A RESTful API allows an application to communicate with other applications. It is based on the structure of a website, where the data and information are stored in the form of resources. RESTful APIs make use of these resources to provide a certain level of accessibility and data exchange between different systems. This makes web development more efficient, as resources can be accessed easily and quickly.

A RESTful API Developer is responsible for designing and developing APIs to facilitate communication between different applications. The Developer will use their existing skills in web development to create APIs that are secure and reliable, that can provide clients with the ability to access resources for different types of usage. The Developer will also ensure that the APIs are well documented so that any updates or changes to their backend programming environment don't cause any disruptions with existing communication workflows.

Here's some projects that our expert RESTful API Developer made real:

  • Creating browser extensions using Microsoft Graph API
  • Building webpages for flight searches & results
  • Developing applications for React Native in PHP
  • Retrieving data through various APIs, presenting it in a table format & sending email notifications
  • Developing & integrating simple authentication functions into Laravel apps
  • Integrating WordPress REST APIs into mobile apps via PHP
  • Building middleware systems to convert HTTP GET requests into REST calls
  • Developing programs in C# .NET using the WordPressPCL Package Library
  • Developing cloud services programs using Cloud Flare's API
  • Creating tools to trigger Customer orders with CSV file uploads

At Freelancer.com, our RESTful API Developers are highly experienced professionals dedicated to delivering innovative solutions that meet our clients' specific needs! Our Developers have successfully completed various projects for a wide range of clients, enabling quick and secure data exchange between applications. If you’re looking for an experienced developer to create an efficient, reliable and secure API system, then post your project now and hire the most suitable API developer here on Freelancer.com!

From 111,974 reviews, clients rate our RESTful API Developers 4.9 out of 5 stars.
Hire RESTful API Developers

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    26 jobs found

    From Pakistan or India we need Python Developer for long term and at low budget. I have a brand-new, web-based project that needs to be coded in Python from the ground up. The scope is intentionally lean so a junior-level developer can comfortably handle it while still touching the core pieces of a modern web app. The stack is flexible: Django or Flask are both fine, as long as the final codebase is clean, documented, and easy for me to pick up later. A lightweight front-end (simple HTML/CSS or any minimal JS you prefer) is all that’s required; the emphasis is on solid back-end structure.

    $6 / hr Average bid
    $6 / hr Avg Bid
    75 bids
    Frontend & Backend Developer
    6 days left
    Verified

    I have a complete set of Figma screens for our new corporate website and now need them brought to life. Your main focus will be twofold: building a pixel-perfect, responsive frontend in React with clean HTML, modern CSS and vanilla JavaScript where needed, and wiring that UI to a robust Node.js backend. On the frontend you’ll translate every component from the designs, set up routing, state management and animations where the mock-ups call for them, and be sure the experience remains consistent across Chrome, Firefox, Safari and Edge. Accessibility and mobile responsiveness are non-negotiable. On the backend you’ll create well-structured Node.js services that expose RESTful APIs, connect to our existing data sources, and handle integrations such as CRM and email gateways. I&r...

    $15 Average bid
    $15 Avg Bid
    43 bids

    Full Stack Developer Needed : Healthcare AI Platform Deployment (React + FastAPI + Huawei Cloud) We are looking for a highly skilled Full Stack Developer with strong system analysis and DevOps capabilities to work on an enterprise healthcare AI platform deployment. The ideal candidate should be capable of reading, understanding, analyzing, enhancing, and deploying an existing codebase independently with minimal supervision. ## Project Scope The platform includes: * Dashboards * AI Agent Hub * User & Access Management * WhatsApp Notifications * Multi-branch Healthcare Operations The deployment target is Huawei Cloud infrastructure. ## Technical Requirements ### Frontend * React.js * TypeScript * Dashboard development * RBAC-based UI routing * API integrations * Responsive enter...

    $265 Average bid
    $265 Avg Bid
    33 bids

    My production Django app suddenly stopped serving data—the REST API endpoints time-out with no response while the site itself still loads. The project runs Django + Django REST Framework on a MySQL backend. I need someone who can jump in right away, trace the root cause, and patch it without disrupting existing users. You’ll have SSH access to the Ubuntu server, the Git repository, and a staging branch for testing. Acceptance criteria: • All previously failing endpoints return the correct JSON payload with HTTP 200 in Postman and curl. • No new warnings or errors appear in the Django or Nginx logs. • Migrations, admin, and cron tasks keep working against MySQL. • A concise commit message summarises the fix and a short report explains what broke...

    $144 Average bid
    $144 Avg Bid
    160 bids

    More details: Which web API do you need integrated into the Flutter app? What is the main purpose of integrating the web API into the Flutter app? Fetch all screens from Cms Manhattan submit requests to get datasets and map dataset to flutter I need complete all screen which made in flutter app design for shop. I need deploy it on Google play and Apple store . So get dataset just add &format=json to URL each page . I see web service for catalog was not complete . I will complete it down the road . Or we can use catalog from original web site which is done . So catalog and other parts required to apply role to display some buttons as example . So you need to get User Role for that More I see web service for catalog was not complete . I will complete it down the road . Or we can use c...

    $269 Average bid
    NDA
    $269 Avg Bid
    51 bids

    I’m building a browser-based enterprise management platform and I need the front-end completed with React.js. The application already has an established back-end; what’s missing is a polished, responsive interface that feels fast and intuitive on any screen size. All work will sit inside a modern toolchain (ES2022, Vite, Git, Jest) and lean on React’s functional component paradigm. The key modules in scope are a secure user authentication flow and a series of data-rich analytics dashboards. I want Context API for state, coupled with React hooks to keep the codebase clean and testable. Styling can be handled with plain CSS Modules or a lightweight utility framework—whichever lets us keep bundle size small without sacrificing maintainability. Accessibility (WCAG...

    $9 / hr Average bid
    $9 / hr Avg Bid
    67 bids

    I am ready to move from concept to a working MVP and want every core layer built in one coordinated sprint. The product will be available on iOS and Android first, with a lightweight web dashboard for administration and analytics. Design I need a completely custom look and feel—no off-the-shelf Material or Flat themes. Your first task will be producing high-fidelity UI/UX mock-ups for the mobile apps and the web dashboard, then translating them into workable front-end components. Mobile prototype The prototype must run natively on both iOS and Android. It should already support: • Secure user authentication (email/social) • Push notifications (device token management included) • In-app purchases for digital content Backend & data layer Please archi...

    $320 Average bid
    $320 Avg Bid
    44 bids

    For a set of consumer-facing mobile products built with Flutter 3.x and Dart, I need an experienced developer who can dedicate four focused hours every day. The daily work revolves around extending existing features, refining clean and responsive UI, and wiring screens to RESTful endpoints; familiarity with Firebase (Auth, Cloud Firestore, FCM) will give you an edge because several modules already rely on it. Workflow • You’ll receive clearly scoped tickets each day, push code to our private GitHub repo, and open a pull request with concise commit messages. • Communication happens in Slack; a short stand-up text update at the end of your session is enough. • All code must compile on both Android and iOS without warnings and follow our simple dart lint rules. Wh...

    $3 / hr Average bid
    $3 / hr Avg Bid
    66 bids

    I’m ready to add a dedicated Django developer to my remote team for a full-time, 8-hour-per-day schedule. The work revolves around hands-on Django and Python coding, so deep, current expertise in both is my top hiring criterion. All services you build or maintain are exposed as RESTful APIs, so I need someone already comfortable designing, documenting, securing, and scaling those endpoints. You’ll also manage our CI/CD pipeline: pushing code through automated tests and deployments with tools such as GitHub Actions, Jenkins, or similar. About ten percent of the role touches the front-end—simple template tweaks or light JavaScript—while the rest is pure backend work, including routine deployments and keeping the architecture clean and maintainable. The position is f...

    $19 / hr Average bid
    $19 / hr Avg Bid
    120 bids

    Optimize and fix performance issues in an existing Flutter mobile application for Android and iOS. Tasks include improving app speed, reducing lag, fixing UI/rendering issues, debugging crashes, optimizing API and state management performance, and preparing production builds for deployment. Experience with TestFlight, Apple App Store, and Google Play Store publishing, release management, Firebase integration, and production-ready Flutter applications.

    $11 / hr Average bid
    $11 / hr Avg Bid
    125 bids

    I’m ready to add a dedicated Django developer to my remote team for a full-time, 8-hour-per-day schedule. The work revolves around hands-on Django and Python coding, so deep, current expertise in both is my top hiring criterion. All services you build or maintain are exposed as RESTful APIs, so I need someone already comfortable designing, documenting, securing, and scaling those endpoints. You’ll also manage our CI/CD pipeline: pushing code through automated tests and deployments with tools such as GitHub Actions, Jenkins, or similar. About ten percent of the role touches the front-end—simple template tweaks or light JavaScript—while the rest is pure backend work, including routine deployments and keeping the architecture clean and maintainable. The position is f...

    $255 Average bid
    $255 Avg Bid
    33 bids

    PROJECT: Brain Bee Web-Mobile App ABOUT BRAIN BEE: Brain Bee is a comprehensive educational platform designed to make learning engaging and interactive. This fully developed web and mobile application delivers a seamless learning experience across all devices. KEY FEATURES: • Interactive quiz modules with instant feedback • User authentication and personalized profiles • Real-time progress tracking and analytics • Achievement badges and gamification • Responsive web interface • Native mobile apps (iOS/Android) • Social leaderboards • Admin content management system • Cross-platform data synchronization TECH STACK: • Frontend: React (Web) & React Native (Mobile) • Backend: Node.js/Express • Database: PostgreSQL • APIs: ...

    $7 / hr Average bid
    $7 / hr Avg Bid
    116 bids

    I have a complete set of Figma screens for our new corporate website and now need them brought to life. Your main focus will be twofold: building a pixel-perfect, responsive frontend in React with clean HTML, modern CSS and vanilla JavaScript where needed, and wiring that UI to a robust Node.js backend. On the frontend you’ll translate every component from the designs, set up routing, state management and animations where the mock-ups call for them, and be sure the experience remains consistent across Chrome, Firefox, Safari and Edge. Accessibility and mobile responsiveness are non-negotiable. On the backend you’ll create well-structured Node.js services that expose RESTful APIs, connect to our existing data sources, and handle integrations such as CRM and email gateways. I&r...

    $59 Average bid
    $59 Avg Bid
    73 bids

    I run Workday as our HR backbone and already automate a number of processes with Workato recipes. The next step is to plug Adobe Learning Manager into that same flow so every employee record, enrollment and completion event moves cleanly between the two systems without manual effort. Here is what I need you to wire up: • Course enrollment sync • Completion status updates • User data management You should be comfortable working with Workato connectors, Workday Web Services, and the Adobe Learning Manager REST APIs, building reusable recipes, handling OAuth tokens, and mapping custom fields that don’t line up out-of-the-box. I’ll pass you access to our lower-environment tenants first; once the integration is stable, we’ll promote it together to produ...

    $11 / hr Average bid
    $11 / hr Avg Bid
    28 bids

    I need to add direct WhatsApp messaging to our in-house ERP so that I can trigger posts to existing WhatsApp groups right from the dashboard. The key requirement is that every message—whether plain text, image, video, or other attachment—must show my personal phone number as the sender inside the group, not a generic business account. Scope • Analyse which officially supported (or reliable alternative) APIs or gateways can post to WhatsApp groups while preserving the original sender ID. • Design a lightweight integration layer that my ERP can call through REST or webhooks. • Build and test endpoints for sending both text and multimedia. • Provide clear setup notes: token management, device pairing, rate limits, and any compliance considerations. &...

    $30 Average bid
    $30 Avg Bid
    81 bids
    Senior n8n Automation Expert
    2 days left
    Verified

    I’m expanding a set of business-critical automations and I need someone who already knows n8n inside out. You’ll take the lead on three fronts: • Designing and refining advanced workflow automation that can scale without breaking existing processes • Building custom nodes when the default palette can’t cover a requirement, keeping the code clean, documented, and merge-ready • Connecting n8n to a variety of external services—REST and GraphQL APIs, webhooks, and OAuth flows—so data moves seamlessly between our tools I’ll share a detailed mapping of each process, sample payloads, and access to a staging environment as soon as we start. Your work is considered complete when every workflow is running error-free in production, the custom n...

    $14 / hr Average bid
    $14 / hr Avg Bid
    104 bids

    → Main website → Internal PSA → Customer portal → API Ticket Workflow Requirements 1. Ticket Creation Workflow When receiving a customer phone call: * Create a new ticket * Assign ticket number automatically * Add customer information * Add multiple contacts to the same ticket * Add device information * Add issue description * Add diagnostic service automatically or manually Once the ticket is created: * Customer should receive email confirmation * Email should include: * Ticket number * Ticket details * Calendar invite * Company contact information 2. Ticket Tabs Structure Each ticket should contain multiple tabs Required tabs: A. Overview * Ticket summary * Status * Priority * Assigned technician * Dates * Billing summa...

    $621 Average bid
    $621 Avg Bid
    147 bids
    Logistics Open-Bid Web App
    1 day left
    Verified

    I want a clean, responsive web application where logistics companies compete in an open-bid environment for loads or routes. The heart of the platform is the user bidding system, so every screen, workflow, and data model should revolve around real-time, transparent bidding. Important Note: While applying, you must include the links to at least 5 comparable web applications you have created. These sites much be functional. Core flow • A shipper posts a load request. • Verified logistics companies view the request, see the current best offer, and submit their own bids in real time. • When the countdown expires, the shipper can award the job through the dashboard. Key requirements • Role-based accounts (shipper, carrier, admin) with secure sign-up and 2-fac...

    $19 / hr Average bid
    $19 / hr Avg Bid
    168 bids

    I’m launching a web-based social network and need an experienced developer to take it from concept to a live, scalable platform. The core build must include secure user registration and login, a real-time activity feed, follow/friend functionality, direct messaging, notifications, profile editing, and a simple admin dashboard. Responsive design is essential so the service feels seamless on phones, tablets, and desktops. I’m flexible on the stack, though a modern front-end framework such as React or Vue paired with a robust back end (Node.js, Django, or similar) and an SQL or NoSQL database would be ideal. Clean RESTful (or GraphQL) APIs are important because I plan to introduce a companion Windows desktop client later, so please architect with that future integration in mind. ...

    $62 Average bid
    $62 Avg Bid
    54 bids

    Optimize and fix performance issues in an existing Flutter mobile application for Android and iOS. Tasks include improving app speed, reducing lag, fixing UI/rendering issues, debugging crashes, optimizing API and state management performance, and preparing production builds for deployment. Experience with TestFlight, Apple App Store, and Google Play Store publishing, release management, Firebase integration, and production-ready Flutter applications.

    $94 Average bid
    $94 Avg Bid
    36 bids

    I’m building a brand-new web application under a fast-moving startup and I need one dedicated engineer to own the full stack from day one. We operate on California (PST) business hours, so you’ll work those hours alongside me and the design team, collaborating live through Slack, GitHub and Zoom. The core of the product is a React-driven front end, coupled with whatever back-end stack you’re most productive in—Node/Express, Python/FastAPI, or a comparable RESTful setup. You’ll start with green-field architecture decisions, set up CI/CD, wireframes to working screens, database schema, APIs, automated tests and production deployment. This is a full-time, monthly-salary role and I’m hiring an individual developer only—no agencies or teams. Automa...

    $580 Average bid
    $580 Avg Bid
    242 bids
    Falls Management App Development
    22 hours left
    Verified

    I need a full stack developer and Android app specialist to create a falls management social care application. We’re building a system that places NFC tags where care happens — on residents’ mobility aids (where present), bed-frames, and door-frames, with an optional consent-driven silicone wristband. Staff tap their phone and instantly see a traffic light status (Green/Amber/Red) with key clinical flags. The status is set by senior nursing staff via a guided MFRS-based clinical workflow. We’re seeking proposals to build this in three potential phases. You may quote for any one phase, multiple phases, or all three. Project context The problem Falls in UK care homes drive 255,000 emergency hospital admissions per year and cost the NHS £2.3 billion. The single b...

    $5828 Average bid
    NDA
    $5828 Avg Bid
    161 bids

    Χρειάζομαι ολοκληρωμένη διασύνδεση του ημερολογίου κρατήσεων που διαχειριζόμαστε μέσω Exely PMS με το myDATA της ΑΑΔΕ. Τι ζητώ να υλοποιηθεί • Αυτόματη καταχώρηση &a...

    $471 Average bid
    $471 Avg Bid
    13 bids

    Necesito replicar nuestro actual programa de gestión en una nueva instancia basada en Strapi. El sistema original corre en filemaker y deseo mantener ese enfoque en cloud, garantizando la misma lógica de negocio y flujos de trabajo, pero aprovechando las ventajas de Strapi (Node.js, API REST/GraphQL, roles y permisos nativos). Al reconstruirlo, deben quedar operativas las siguientes áreas: • Gestión de usuarios • Generación de informes • Control de inventario • Gestión de presupuestos • Facturación (verifactu) Además, los primeros módulos que necesito totalmente integrados son Gestión de usuarios y Generación de informes, sobre los que validaré la fidelidad del clon antes...

    $1196 Average bid
    $1196 Avg Bid
    127 bids

    Tengo mi app Lovable casi lista, pero aún quedan varios detalles técnicos antes de publicarla. Busco a alguien que pueda cerrar este sprint y dejarla preparada para producción: 1. Conectar la API de la base de datos de artículos científicos que ya tengo seleccionada, mostrando los resultados dentro de la interfaz actual. 2. Configurar el plan de pago como prueba gratuita con opción de compra: el usuario disfruta X días sin costo y, al vencer, se activa el cobro recurrente que definamos. 3. Restringir ciertas funciones para estudiantes: solo quienes se registren con carnet y datos académicos podrán acceder a esas secciones. 4. Verificación de correo mediante código numérico enviado al email durante el regis...

    $36 Average bid
    $36 Avg Bid
    32 bids

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