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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.

REST API PHP C Programming Java JavaScript

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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

REST API PHP JavaScript Python Website Design

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Vishal Ashwani M.

4.7

6.4

100%

PERTH, Australia

$82 USD per hour

For over two decades, I’ve been engineering software that doesn’t just work — it performs, scales, and feels effortless. I specialise in AI-driven software engineering using Python, JavaScript, and AWS, building everything from fast APIs to full end-to-end SaaS platforms. Front-end to back-end, I turn ideas into smooth digital experiences. SQL or NoSQL — I design and optimise databases that run clean and handle real load. APIs & automation — I build scalable REST services and workflow automation that keep products running smoothly. My approach is simple: engineer clean systems, automate the boring parts, and make everything feel seamless in the real world — from the UI to the database to the cloud. Over the past few years, I’ve been working hands-on with AI across practical, production-ready use cases: chatbots, trading bots, analytics tools, talking avatars, object detection, and image generation. My focus is always the same - making AI engine that actually get used, make sense, and deliver value to the product. Whether it’s Python microservices, JavaScript front-ends, AWS cloud architecture, or building a full SaaS system from scratch, I aim for clean engineering and a result that feels remarkable in the real world. Cheers, Vishal Maharaj

REST API PHP C Programming Java JSP

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Sami A.

5.0

3.0

100%

Sydney, Australia

$50 USD per hour

Full Stack Engineer with hands-on expertise in AI & DevOps, specialising in end-to-end solution development. My core strength lies in bridging the gap between technology and business: I meticulously analyse client requirements, deliver solutions on time, and simplify complex technical concepts into actionable insights. With a focus on clear communication, thorough documentation, and collaborative problem-solving, I ensure seamless project execution - aligning innovation with real-world needs. - AI Machine Learning, Computer Vision, Speech Recognition, Time Series Analysis, NLP, RAG, Mathematical Modelling, Recommendation Systems - DevOps CI/CD Pipelines, Cloud Infrastructure, Containerization, IaC, Monitoring, Automation - Full Stack Web Development, AI integration, Software Testing, Web Scraping, Bot Development, Performance Optimisation

REST API PHP C Programming Python .NET

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Viraj K.

5.0

4.3

100%

Strathfield, Australia

$45 USD per hour

Hello! I’m 𝑽𝒊𝒓𝒂𝒋 𝑲𝒂𝒓𝒂𝒏𝒈𝒖𝒕𝒌𝒂𝒓, a software engineer based in 𝐀𝐮𝐬𝐭𝐫𝐚𝐥𝐢𝐚. More than just writing code, I like to work as a technical partner for the people I collaborate with. Many projects start as an idea on paper, and my role is to help turn that idea into something real, stable, and ready for users. From the first concept to the final delivery, I focus on building systems that are reliable, scalable, and pleasant to use. Technology changes quickly, but good engineering and clear thinking never go out of style. One thing clients quickly notice about me is that I care a lot about trust and reliability. If something is in production and people depend on it, it should work properly. That mindset guides how I design and build software. 𝐖𝐡𝐚𝐭 𝐈 𝐇𝐞𝐥𝐩 𝐁𝐮𝐬𝐢𝐧𝐞𝐬𝐬𝐞𝐬 𝐁𝐮𝐢𝐥𝐝 ✔ Mobile Applications Apps that feel fast, smooth, and natural for real users. Whether it's a startup product or a business tool, I focus on making mobile apps that people actually enjoy using. ✔ Desktop Applications Powerful desktop tools for internal operations, automation, or specialized workflows. These are often the quiet heroes inside companies that keep everything running efficiently. ✔ Web Platforms Modern web applications, dashboards, marketplaces, SaaS products, and business systems. I enjoy building platforms that help companies operate more efficiently and scale their services. 🤖 AI & Intelligent Systems I’ll be honest… I’m a bit of an AI enthusiast. Over the past few years I’ve spent a lot of time learning how AI can actually be useful inside real products, not just demos. ✔ Integrating APIs like OpenAI or Claude ✔ Building chatbots and AI assistants ✔ Creating RAG pipelines for knowledge systems ✔ Working with model tuning and intelligent automation From simple AI integrations to more advanced AI-powered systems, I enjoy helping products become smarter and more capable. 𝐌𝐲 𝐒𝐤𝐢𝐥𝐥𝐬 Technically, I work across multiple parts of the stack. ✔ Mobile technologies such as Kotlin, Swift, Java Flutter and React Native ✔ Web development with ASP.NET, React, Vue, Angular, PHP, Laravel ✔ Desktop development using modern frameworks and tools (C#, Electron, Qt etc) ✔ APIs, backend architecture, and scalable systems I also have experience with CMS platforms like WordPress, Wix, and Kajabi, along with DevOps, cloud infrastructure, and database design. If I tried to list every tool or technology I’ve worked with, this profile would probably turn into a few extra pages, so I’ll stop here😅. 𝐇𝐨𝐰 𝐈 𝐖𝐨𝐫𝐤 ✔ Clear communication and honest collaboration ✔ Careful architecture and maintainable systems ✔ Reliable delivery and long-term thinking If you have an idea and want someone who can help turn it into a solid, well-engineered product, I’d be happy to help. Let’s build something 𝑨𝑴𝑨𝒁𝑰𝑵𝑮 and 𝑹𝑬𝑴𝑨𝑹𝑲𝑨𝑩𝑳𝑬.

REST API PHP JavaScript Python SEO

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How to hire a great freelance REST API Developer

A REST API developer is a backend engineer who designs, builds, documents, and maintains RESTful web services that allow software systems to exchange data over HTTP. These freelancers translate business logic into stateless endpoints that mobile apps, web frontends, and third-party integrations consume reliably and securely.

What a REST API developer delivers

A freelance REST API developer produces production-ready services that power your product's data layer. Their work sits between your database and every client that reads or writes to it, which makes API quality a direct driver of app performance, integration speed, and developer experience for any team consuming the endpoints.

Typical deliverables include endpoint design, authentication flows, request validation, error handling, rate limiting, versioning strategy, OpenAPI specifications, and automated tests. A strong RESTful API developer also writes clear documentation so internal teams and external partners can integrate without back-and-forth clarification.

Core services and tasks handled

Designing resource-oriented URLs, HTTP verbs, and status codes that follow REST conventions

Building CRUD endpoints in frameworks such as Node.js with Express or NestJS, Django REST Framework, Flask, FastAPI, Spring Boot, Laravel, Ruby on Rails, or ASP.NET Core

Implementing authentication and authorization with JWT, OAuth 2.0, API keys, or session-based flows

Writing OpenAPI or Swagger specifications and generating interactive documentation

Integrating relational and NoSQL databases including PostgreSQL, MySQL, MongoDB, and Redis

Adding pagination, filtering, sorting, caching, and rate limiting to scale endpoints

Connecting third-party APIs such as Stripe, Twilio, SendGrid, Shopify, and Salesforce

Writing unit, integration, and contract tests with Postman, Jest, Pytest, or PHPUnit

Deploying to AWS, Google Cloud, Azure, or container platforms using Docker and Kubernetes

Setting up CI/CD pipelines, logging, and monitoring with tools like Datadog or New Relic

Tools and technologies REST API developers use

Freelance API developers work across a stack that typically includes a backend framework, a database, an API gateway, and a documentation toolchain. Common tools include Postman and Insomnia for testing, Swagger and Redoc for documentation, GitHub or GitLab for version control, and AWS API Gateway, Kong, or Apigee for gateway and traffic management. For schema validation and serialization, libraries such as Joi, Pydantic, Zod, and Marshmallow are standard.

Adjacent skills you may need on the same engagement include database design, GraphQL, microservices architecture, DevOps, message queues such as RabbitMQ or Kafka, and frontend integration work in React, Vue, or mobile frameworks.

Industries and use cases

REST APIs power nearly every connected product. Freelance REST API developers regularly build services for fintech platforms handling payments and KYC, e-commerce backends synchronizing inventory and orders, SaaS products exposing public APIs to customers, healthcare systems integrating with EHRs, logistics platforms tracking shipments, and IoT systems ingesting device telemetry. They also support startups validating MVPs and established businesses migrating monoliths to microservices.

How to evaluate REST API developer candidates

Look for engineers who can show a portfolio of production APIs, public OpenAPI specs, or open-source contributions. Strong candidates explain trade-offs clearly: when to use PUT versus PATCH, how to version breaking changes, how to handle idempotency, and how they secure endpoints against common OWASP API risks.

Signals worth weighing include framework depth in your chosen language, experience with the database you use, familiarity with cloud deployment, and a track record of writing tests and documentation. Sample interview questions you can use directly:

How would you design pagination for an endpoint returning millions of records, and what trade-offs apply between offset and cursor-based approaches?

Walk me through how you would implement authentication and refresh tokens for a mobile client consuming this API.

How do you version a REST API when introducing a breaking change, and how do you communicate deprecation to consumers?

What's your approach to handling validation errors, and how do you structure error responses?

Describe a time you had to debug a slow endpoint. How did you identify the bottleneck and what did you change?

Why hire REST API developers on Freelancer.com

Freelancer.com gives you access to a global pool of backend engineers covering every major language and framework, from Node.js and Python to Java, Go, and PHP. You can review verified portfolios, ratings, and completion histories before shortlisting, and clients on Freelancer.com set their own budgets and receive competitive bids matched to project scope. Whether you need a single endpoint added to an existing service or a full backend built from scratch, you will find freelancers on Freelancer.com with the specific stack experience your project requires.

Post a project on Freelancer.com today and connect with skilled REST API developers ready to design, build, and document the services your product depends on.

What are the steps to hiring a freelance REST API developer?

Hiring a REST API developer starts with a brief that describes the resources, integrations, and consumers your service must support. The clearer you are about your stack, authentication needs, and deliverables, the more accurate the bids you receive will be. The process below walks you through posting, reviewing, and awarding the project.

Step 1: Post your project on Freelancer.com

The project post is the single biggest determinant of bid quality. A precise brief filters out generic applications and attracts engineers whose stack and experience genuinely match your needs. Head to the post project page , where you fill in the brief, scope, timeline, and budget before publishing the project for freelancers to bid on.

State the preferred backend language and framework, for example Node.js with Express, Django REST Framework, or Spring Boot

List the resources and endpoints required, or attach a draft OpenAPI specification if you have one

Specify authentication needs such as JWT, OAuth 2.0, or API key issuance

Note the database and hosting environment, including any third-party APIs to integrate with

Define deliverables: source code, tests, documentation, deployment scripts, and handover format

Include timeline, milestones, and indicative budget range

Step 2: Review bids from freelancers

Bids are short proposals, not just price quotes. They reveal how each freelancer interprets your brief, which approach they would take, and what timeline they consider realistic. Read them carefully and shortlist developers whose understanding of REST conventions, security, and your stack lines up with what you need.

Check whether the proposal references your specific framework, database, and authentication requirements

Look for clarifying questions about edge cases, rate limiting, or versioning — a sign of senior thinking

Review attached samples such as public OpenAPI specs, GitHub repositories, or live API documentation

Assess whether the proposed timeline accounts for testing and documentation, not only endpoint coding

Use Freelancer.com chat to ask follow-up questions about deployment, error handling, and post-launch support before shortlisting

Step 3: Evaluate freelancers and award the project

The final decision combines proposal quality with profile evidence. Weigh consistency across past API projects, not a single standout example, and confirm the freelancer has shipped work in a stack similar to yours. Reviews from past clients often reveal communication style and reliability under deadlines.

Review portfolio depth: number of API projects shipped, complexity, and stack relevance

Check star ratings and the volume of completed projects on Freelancer.com

Read written client reviews for signals on code quality, documentation, and responsiveness

Confirm verified payment method, completion rate, and on-time delivery rate

Award the project and use Freelancer.com Milestone Payments to release funds as endpoints, tests, and documentation are delivered

How long does a REST API project take?

A small set of endpoints integrated with an existing database can be delivered in a few days, while a full backend with authentication, third-party integrations, documentation, and tests typically takes several weeks. Timeline depends on the number of resources, complexity of business logic, and whether deployment and CI/CD are in scope.

What's the difference between a REST API developer and a backend developer?

A backend developer is a broader role covering databases, business logic, background jobs, and APIs. A REST API developer is a backend developer who specializes in designing and building RESTful web services, with deeper focus on endpoint design, documentation, versioning, and API security.

Should I hire a REST API developer or use GraphQL instead?

REST remains the standard for public APIs, simple CRUD services, and integrations where caching and HTTP semantics matter. GraphQL fits cases where clients need flexible queries across related resources. Many freelancers on Freelancer.com are comfortable with both and can advise which fits your use case.

Can I hire a REST API freelancer for a one-off project?

Yes. Many clients hire on Freelancer.com for short engagements such as building a specific integration, writing OpenAPI documentation for an existing service, or auditing API security. You can also retain the same freelancer for ongoing maintenance once the initial scope is delivered.

Do I need to provide my own database and hosting?

Not necessarily. A REST API developer can recommend and provision databases and hosting on AWS, Google Cloud, Azure, or other providers as part of the engagement. Be clear in your brief about whether infrastructure setup is in scope so bids reflect the full work.