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Post your project for free and connect with skilled API Developers ready to start today. Compare bids, ratings and portfolios, and only pay when you're happy with the work.
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No upfront cost · pay only when you're happy with the work
5.7
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.
5.5
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
6.4
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
3.0
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
2.5
2.5
100%
Craigieburn, Australia
$25 USD per hour
I am a passionate programmer of PHP and Oracle. I enjoy using a combination of PHP at front-end and Oracle at back-end. However, I am almost equally good at using MySQL.
1.6
1.6
50%
Melbourne, Australia
$25 USD per hour
Highly accomplished Senior-level Full-Stack Developer and R&D Engineer with over 20 years of progressive experience designing, architecting, and deploying enterprise-grade software solutions. 📌 Specialized in modern .NET ecosystems, robust front-end frameworks (Angular, React), and scalable cloud infrastructure (Azure, AWS) across the healthcare, e-commerce, and high-precision laboratory instrumentation sectors. 💪 Proven track record driving complex architectural transitions, executing seamless cloud migrations, and establishing modern distributed systems. Expert in implementing Domain-Driven Design (DDD), Clean Architecture, and CQRS patterns within fast-paced, high-performing engineering teams. Recognized for bridging the gap between cloud-connected web layers and low-latency hardware/firmware interfaces, ensuring full-lifecycle ownership from business requirements to production deployment. 🏗 CORE ARCHITECTURAL FOCUS Distributed Systems: Microservices, event-driven design, serverless architectures, and multi-tenant SaaS. Modern Engineering Practices: SOLID principles, Clean Architecture, Test-Driven Development (TDD). Data & Analytics Integration: Designing strict engineering standards for massive warehouse pipelines (Snowflake) and enterprise relational models. Leadership & Delivery: Facilitating Agile methodologies (Scrum, Kanban, Spotify Scrum Model) and cross-functional team collaboration.
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.
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:
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.
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.
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:
Sample interview questions you can use directly:
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?
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.
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
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.
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.
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.
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.
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.
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.
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.
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