Hire expert
API Developers
for any job

Millions of people use Freelancer to turn their ideas into reality.

Hire a top API Developer now

Trusted by leading brands and startups

Hire API Developers

The Hawkesbury Geek

5.0

138

8.1

99%

Kurrajong, Australia

$35 USD per hour

G'day! I'm Brett, a full-stack developer with 20+ years of hands-on experience in website design, development, mobile & desktop app development, hosting, AI-driven automation, and advanced Excel-based data and financial solutions. I went through all levels of verification by Freelancer staff providing you with reassurance that I am one of the top developers on Freelancer. I build reliable, scalable websites and applications, and I help businesses use AI in a practical way — automating repetitive work, improving customer experience, and making systems smarter without unnecessary complexity. My core tech stack includes PHP, JavaScript, Python, C/C#, and Java, along with modern frameworks, AI, APIs, and industry-standard tools. What I Do 1. Website Design Figma, PSD, and Adobe XD to Responsive Layouts using CSS, Bootstrap, Tailwind CSS 2. WordPress - Custom themes & plugins - ACF, Gutenberg, Elementor, Divi, Beaver Builder, Oxygen, WPBakery - Advanced custom forms (Gravity Forms, WPForms, Contact Form 7) 3. Website & Application Development 3.1 Next.js & Modern Web Apps - Next.js websites and applications - Server-side rendering (SSR) & API integrations - Secure, scalable architecture 3.2 Front-End - HTML, CSS, JavaScript, jQuery - React.js, Angular, Vue.js, MUI - Bootstrap, Tailwind CSS 3.3 Back-End - Node.js (Express) - PHP (Laravel, Symfony, CodeIgniter, Yii, Zend) - Python (Django, Flask, FastAPI) - C# (.NET, .NET Core) 3.4 Full-Stack - MERN & MEAN stacks - Secure APIs, authentication & integrations 4. AI & Automation - AI chatbots and assistants for websites & internal tools - OpenAI / LLM integrations (chat, content, data processing) - Smart search, filtering & AI-powered features 5. E-commerce - WooCommerce, Shopify, Magento, Prestashop, OpenCart - Custom features, integrations & performance optimisation 6. Mobile App Development (Flutter & React Native) - Cross-platform mobile app development for iOS and Android - API integration (REST, GraphQL, Firebase, etc.) - Push notifications, authentication, payments & third-party services 7. Desktop Application Development (Electron) - Cross-platform desktop apps for Windows, macOS, and Linux using Electron - Building modern, responsive desktop UI using HTML, CSS, JavaScript, React, and Node.js - API integrations for cloud-connected desktop tools 8. Excel & Finance Automation - Advanced Excel solutions (formulas, pivot tables, dashboards) - Financial modelling, forecasting & reporting tools - Data cleaning, transformation & analysis - Automation using Excel, Google Sheets & scripts (VBA / Python) - Integration with APIs, CRMs, and business systems for real-time reporting 9. Hosting & Deployment - Hosting setup, optimisation & security - Ongoing maintenance and support I'm online pretty much 24x7 so you're never going to wait long for an answer. I'm easy to chat to and extremely keen to achieve a 5/5 result for both sides, get in touch.

API ASP JavaScript Python Website Design

View Profile

Alexander M.

4.8

7.3

96%

Hectorville, Australia

$50 USD per hour

Thanks for stopping by my Profile! I am a well-qualified FullStack Engineer familiar with wide range of programming utilities and languages. Knowledgeable of backend and frontend development requirements. Handles any part of the process with ease. Collaborative team player with excellent technical abilities offering 10 years of related experience. - Programming Languages : JavaScript, C#, Java, Python, CSS, HTML5, HTML6, C++, TypeScript - Frontend React, Redux, React Native, Angular, Vue.js, Flutter, Jquery, Ember.js,Shopify - Backend Node.js, Django, Express.js, ASP.NET, Ruby on Rails, Laravel - DevOps & System Amazon Web Service, Azure, Linux System Administration - Database MongoDB, MySQL, MariaDB, PostgreSQL, Oracle, SQL Server, Redis, Firebase - Security Cyber Security, System security - OpenAI Building ChatBot using OpenAI models, Fine Tuning, Training Dataset, Voice Chatting - Cryptocurrency Blockchain,cryptocurrency development and integration As you can see, I am well adept at working with all the relevant platforms, and if you’re interested in getting an idea of how I work and what I create, feel free to reach out via Freelancer! I'm always available through message and am happy to give free consultations and proposals for all new and returning clients!

Photoshop iPhone eCommerce iPad MVC

View Profile

Pinnacle Digital Services

4.9

6.6

100%

Wollert, Australia

$20 USD per hour

Hi, I’m Jaffer – welcome to Pinnacle Digital Services! At Pinnacle Digital Services, we specialize in crafting high-quality mobile apps, websites, and desktop applications tailored to your unique needs. Our mission is simple: to deliver innovative, results-driven solutions that go beyond expectations. By combining deep technical expertise with a client-centric approach, we ensure every project is aligned with your vision and business goals. Why Choose Pinnacle Digital Services? We’re committed to excellence in every detail. From our first conversation to final delivery and ongoing support, your satisfaction is our priority. We believe in long-term partnerships built on trust, transparency, and collaboration—helping you grow while we grow with you. Our Core Services & Expertise: Web Development Technologies: PHP, MySQL, HTML5, CSS, jQuery, Node.js, Vue.js Frameworks: CodeIgniter, Laravel, CakePHP Mobile App Development Android: Java, Kotlin iOS: Swift Desktop Application Development Languages: Java/JavaFX, C/C++, C#, Python, Matlab, Let’s Build Something Great Together Whether you're launching a startup, streamlining operations, or taking your brand to the next level, we’re ready to turn your ideas into impactful digital experiences. Have questions or a project in mind? Reach out—our dedicated team is always here to help you succeed.

API PHP C Programming Java JavaScript

View Profile

Ahammad F.

4.9

5.4

95%

Bankstown, Australia

$50 USD per hour

15+ years fulltime working experience in software development on both Desktop and Web applications Extensive hands-on experience on Agile Development Process both XP and Scrum Extensive knowledge on Design patterns .Net Framework (2.0 - .NET CORE 3.1) - C#, VB.NET, WPF - ASP.Net, MVC, WCF, Web API, Web Services, SignalR - Entity Framework(4.0-6+), LINQ, NHibernate - SharePoint 2010 and SharePoint 2013 (custom business logic and workflow development, administration and branding using custom code and SharePoint designer) - Windows Mobile development(6.0) - NUnit, Selenium Cloud Platform - AWS - Azure UI Technologies - ReactJS, AngularJS, NodeJS, JavaScript, jQuery, ExJS - HTML, Bootstrap, Sencha, CSS3, LESS Other Languages - VB6.0, C, C++ Database - MSSQL, Oracle, MySql BI Tools - ETL, SSIS, CUBE, Power BI Performance Optimization Tools - New Relic, Azure Monitoring, Application Insights, SQL Profiler Third Party Tools Telerik, Infragistic, DevExpress, InterSoft Source Control and CI Tools - TFS, GIT, SVN, MS Visual Source Safe - VSTS (Azure DevOps), Cruise Control, Bamboo Reporting Tools - SSRS, Crystal Report, Active Report and Data Report Project Management Tools - JIRA, Trello, Banana Scrum IDE & Software - Visual Studio, MSSQL Management Studio, Eclipse - Dreamweaver, Photoshop - ReSharper 5, 6 and 7

API Visual Basic .NET AJAX SQL

View Profile

Muhammad A.

4.7

5.7

97%

Perth, Australia

$50 USD per hour

I provide complete IT services tailored to modern business needs, with a strong focus on Blockchain development, Artificial Intelligence, Machine Learning, Big Data, Web and Mobile app development, E-commerce platforms, and custom software solutions. I specialize in blockchain technologies including DEXs, DApps, NFTs, Web3, smart contracts, and DeFi applications across platforms like Ethereum, BSC, and Polygon. For web and mobile development, I work with Java, Python, PHP, and top JavaScript frameworks such as React.js, Node.js, Angular, and Vue.js—alongside mobile technologies like Flutter and React Native. My e-commerce solutions are built on platforms like WooCommerce, Shopify, and Magento, while my AI and machine learning services leverage tools such as TensorFlow and AWS to create intelligent, data-driven systems. If you're looking for secure blockchain integration, modern web and mobile development, scalable e-commerce systems, or custom AI-driven software, I’m here to help turn your ideas into powerful digital products.

API PHP C Programming Java JavaScript

View Profile

24Hr Agency

4.2

6.4

88%

Homebush, Australia

$50 USD per hour

Hey there. I am Rolesh, a software developer and I have a team with 8 years of experience in software development. Specifically, we have extensive experience in Web, Mobile, AI, game development. 1. Game Development Unity, Unreal Engine, Construct (WebGL, Mobile, PC Game) Multiplayer, PvP Lua, Godot, Phaser, Minecraft, Java Telegram mini game, trading bot Cinematic, Sandbox In app purchase, Playfab, photon Augmented reality, virtual reality, Metaverse Vuforia, ARCore/Kit, Zapworks, 8th wall Kinetic, Oculus 2. Mobile app development Proficient in developing cross-platform mobile applications using React Native and Flutter. 3. Web Development React.js, Three.js, Node.js, Angular.js, MongoDB Wordpress, eCommerce, Wix, Magento, Shopify Laravel, MySQL, GoLang, Django Admin dashboard 4. Artificial Intelligence, IOT Python, Django AI, ML, API Integration, OpenCV, Tensorflow 5. Blockchain Web3, Cryptocurrency, Solana, Solidity, Metatrader 6. Design UI/UX design Logo Design and Animator

API PHP Java JavaScript XML

View Profile

Phantom Interactive

5.0

5.5

92%

Sydney, Australia

$75 USD per hour

Phantom Interactive provides DevOps and AWS assistance flow utilizing industry proven tools to customers who needs to automate and scale their services. We can assist with release management, infrastructure management, build and deploy pipelines, containerization and orchestration. From managing a development to designing and building infrastructure and CICD pipelines, we can make the difference in a successful project or not. Core skills and capability in our arsenal: - AWS infrastructure and services - CICD automation - Agile coaching, DevOps practices - Containerized workloads, EKS, ECS, native K8s and Docker workload - Blockchain and Crypto expertise, automated trading and analysis - AI implementations, ChatGPT modelling

API PHP JavaScript Python Website Design

View Profile

Qaiser M.

5.0

4.7

93%

Ferryden Park, Australia

$40 USD per hour

With my extensive experience in • Excel & Google Sheets • Google App Script • Python • Web Scraping • Power BI • Looker Studio • Google Analytics • Google Tag Manager • Social Media Marketing • Data Analytics • Web research • JavaScript • Lead Generation • App Store Optimization I am confident I can provide a valuable and unique perspective to your projects. My passion for visual storytelling and commitment to delivering high-quality results have been honed through years of experience working with clients across various industries. I pride myself on my ability to understand each of my client's unique needs and visions and translate that vision into dynamic and engaging content. I am excited about collaborating with you on this project and bringing your ideas to life. Let's connect and explore how we can work together to create something truly extraordinary.

API PHP JavaScript Python Graphic Design

View Profile

Ahmad G.

5.0

100%

Cherrybrook, Australia

$60 USD per hour

I help businesses design, build, and scale reliable technology systems - from high-performing websites to automated data platforms and cloud infrastructure. With over 20 years of experience across enterprise and growing organisations, I combine strategic thinking with hands-on delivery. Whether you need a modern website, a scalable Azure solution, or executive Power BI dashboards, I build solutions that are clean, secure, and built to last. Core Capabilities Web & eCommerce ✔ WordPress & WooCommerce development ✔ Shopify store design & optimisation ✔ Conversion-focused UX design ✔ Performance optimisation & SEO structure Cloud & Infrastructure ✔ Azure, AWS & Google Cloud deployments ✔ Automation (Power Automate, Logic Apps, Python) ✔ Secure hosting & system integration ✔ API development & system connectivity Business Intelligence & Data ✔ Power BI dashboards & executive reporting ✔ Data modelling (DAX, Power Query, SQL) ✔ API integrations & automated data pipelines ✔ Financial, operational & marketing analytics What you can expect ✔ Clear communication ✔ Structured, well-documented solutions ✔ Performance and security best practices ✔ Long-term scalable architecture ✔ Fast turnaround without cutting corners Based in Australia (AEST), working with clients globally.

API PHP Python Visual Basic WordPress

View Profile

See more API Developers

Clients rate our API Developers

4.9 out of 5

from 171,864 reviews

How to hire a great freelance API Developer

An API developer is a software engineer who designs, builds, documents, and maintains application programming interfaces that allow systems, services, and applications to exchange data securely and reliably. Hiring a skilled API developer means getting clean, well-architected endpoints that power web apps, mobile apps, integrations, and third-party platforms without breaking under load.

What an API developer actually delivers

API development sits at the core of modern software. Whether you are launching a SaaS product, connecting a mobile app to a backend, or integrating a CRM with payment and shipping providers, the quality of your APIs determines how fast you ship, how securely your data moves, and how easily other developers can build on top of your platform.

A freelance API developer translates business requirements into structured endpoints, predictable response schemas, and authentication flows your team and partners can trust. They handle the full lifecycle: design, implementation, documentation, versioning, and ongoing maintenance.

Typical deliverables from an API engineer include:

RESTful APIs and GraphQL APIs built to specification

OpenAPI (Swagger) specifications and machine-readable schemas

Authentication and authorization layers using OAuth 2.0, JWT, or API keys

Third-party API integrations with services like Stripe, Twilio, Salesforce, HubSpot, and Shopify

Webhooks, event-driven endpoints, and real-time APIs over WebSockets

Rate limiting, caching, and pagination logic

Postman collections, automated test suites, and developer documentation

API gateways, microservices, and serverless backends

Tools, frameworks, and technologies API developers use

Strong API developers are fluent in multiple stacks and pick the right one for the job. Look for proficiency across the languages and frameworks most commonly used to build production APIs.

Languages: Node.js, Python, Java, C#, Go, PHP, Ruby

Frameworks: Express, NestJS, FastAPI, Django REST Framework, Flask, Spring Boot, ASP.NET Core, Laravel, Ruby on Rails

API styles: REST, GraphQL, gRPC, SOAP, WebSockets

Specification and testing: OpenAPI, Swagger, Postman, Insomnia, Newman, JMeter

Databases: PostgreSQL, MySQL, MongoDB, Redis, DynamoDB

Cloud and infrastructure: AWS API Gateway, Lambda, Azure Functions, Google Cloud Endpoints, Docker, Kubernetes

Authentication: OAuth 2.0, OpenID Connect, JWT, Auth0, Firebase Auth

API management: Kong, Apigee, AWS API Gateway, Tyk

Industries and use cases for freelance API developers

API engineering is in demand across nearly every digital sector. Common projects on Freelancer.com include fintech platforms requiring PCI-aware payment APIs, healthcare applications working within HIPAA-aligned data flows, e-commerce stores syncing inventory between Shopify, ERP systems, and shipping carriers, and SaaS companies exposing public APIs for their customers.

Other frequent use cases include mobile app backends, IoT device communication, marketplace integrations, AI and machine learning model endpoints, logistics and fleet tracking systems, and EdTech platforms connecting LMS tools to assessment engines.

How to evaluate API developer candidates

Strong candidates show evidence of building APIs that scale, are well-documented, and handle edge cases gracefully. Beyond raw coding ability, look for an understanding of API design principles, security, and developer experience.

Signals worth checking:

Public GitHub repositories showing clean, tested API code

Experience with the specific stack your project requires

Familiarity with OpenAPI documentation and contract-first design

Knowledge of security practices: input validation, rate limiting, CORS, OWASP API Top 10

Track record integrating with the third-party services you depend on

Comfort with versioning strategies and backward compatibility

Sample interview questions you can use directly:

How do you decide between REST and GraphQL for a new project?

Walk me through how you would secure a public API that handles user financial data.

What is your approach to versioning APIs without breaking existing clients?

How do you document an API so that frontend and third-party developers can integrate quickly?

Describe how you would design rate limiting and pagination for a high-traffic endpoint.

Why hire API developers on Freelancer.com

Freelancer.com gives you direct access to a global network of API engineers, backend developers, and integration specialists across every major language and framework. Whether you need a single endpoint built quickly or a full microservices architecture, you can post a project on Freelancer.com and receive competitive bids from vetted talent within hours.

Profiles include verified skills, completed project history, ratings, and portfolio samples, so you can compare candidates on real evidence rather than promises. Milestone Payments protect your funds until work is delivered to your standards, and built-in chat, file sharing, and time tracking keep the engagement organized from kickoff to handover.

Ready to build, integrate, or modernize your APIs? Post a project on Freelancer.com today and connect with skilled API developers ready to deliver clean, secure, and well-documented endpoints for your application.

What are the steps to hiring a freelance API developer?

Hiring an API developer works best when you treat the brief as a technical specification, not a wishlist. The clearer you are about endpoints, data flows, authentication, and the systems involved, the more accurate the bids you receive will be. Follow these three steps to find the right engineer for your project.

Step 1: Post your project on Freelancer.com

Your project post is the single biggest factor in the quality of bids you attract. A precise brief filters for developers whose stack and experience genuinely match your requirements, and saves you from sifting through generic proposals. Head to the post project page , fill in the brief, scope, timeline, and budget, then publish the project for freelancers to bid on.

Specify the API style required: REST, GraphQL, gRPC, or WebSockets

List the language and framework preference, such as Node.js with Express or Python with FastAPI

Name any third-party services to integrate with, like Stripe, Twilio, Salesforce, or Shopify

Describe authentication needs: OAuth 2.0, JWT, API keys, or SSO

Include expected request volume, hosting environment, and whether documentation in OpenAPI is required

State your timeline and whether ongoing maintenance is part of the engagement

Step 2: Review bids from freelancers

Bids are short proposals, not just price quotes. They reveal how the developer interprets your brief, what architecture they propose, and which questions they raise about edge cases you may not have considered. Read each bid carefully and shortlist candidates whose technical understanding matches the work.

Look for proposals that reference specific frameworks, libraries, or design patterns relevant to your stack

Check whether the developer asks intelligent clarifying questions about authentication, data models, or rate limits

Assess whether the proposed timeline is realistic for the scope, including testing and documentation

Review attached samples such as GitHub repositories, Postman collections, or live API docs

Use Freelancer.com chat to ask shortlisted bidders about their approach to versioning, error handling, or security

Step 3: Evaluate freelancers and award the project

The final decision combines proposal quality with profile evidence. Look at portfolio depth, ratings, written client reviews, and verified credentials. For API work, consistency matters more than a single impressive project, since reliable engineers ship clean code repeatedly across different stacks and integrations.

Review portfolio breadth: multiple APIs across different frameworks and integration partners

Check star ratings alongside the volume of completed projects, not ratings in isolation

Read written reviews for mentions of code quality, documentation, communication, and on-time delivery

Confirm the freelancer has a verified payment method and a strong completion rate

Look for evidence of testing discipline: unit tests, integration tests, and CI pipelines

Award the project and use Freelancer.com Milestone Payments to release funds only as agreed deliverables are completed and approved

How long does an API development project take?

A simple integration with an existing third-party service can take a few days, while a full custom REST or GraphQL API with authentication, documentation, and testing typically takes two to six weeks. Complex microservices architectures or enterprise systems can run for several months depending on scope and review cycles.

What is the difference between an API developer and a backend developer?

Backend developers build the full server-side application, including business logic, databases, and infrastructure. API developers specialize in the interface layer that exposes that backend to other applications, focusing on contract design, documentation, security, and developer experience. The roles overlap, and many freelancers cover both.

Can I hire an API developer for a one-off integration?

Yes. Many clients hire API developers for short, scoped projects such as connecting a CRM to an email platform, adding Stripe checkout to a website, or building webhooks between two SaaS tools. You can post the integration as a fixed-price project and award it to a single freelancer.

Do I need to provide API documentation before hiring?

If you are integrating with an existing third-party API, share its documentation in your brief so bidders can scope accurately. If you are building a new API from scratch, the developer will produce the documentation as part of the deliverables, typically using OpenAPI or Postman collections.

Should I hire a freelance API developer or an agency?

For focused work on a defined scope, a freelance API developer is usually faster and more cost-efficient. Agencies make sense when you need a full product team across frontend, backend, design, and DevOps. For most integration and API build projects, a single experienced freelancer is the right fit.