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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

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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

Web API Visual Basic .NET AJAX SQL

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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.

Web API PHP C Programming Java JavaScript

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Jacques L.

5.0

5.7

96%

Torquay, Australia

$80 USD per hour

Hi, my name is Jacques Leemans, I’m a full-stack developer, with over 20 years of experience in a variety of engineering fields. My main focus is end-to-end Interactive software engineering, from games to cross-platform GIS applications, design to publishing. Solutions I have worked on: ◦ Cross-platform interactive ebooks app, with a backend server and CMS ◦ GeoJSON to 3D mesh building system ◦ Mobile FPS shooter games ◦ Indoor Navigation System ◦ Vehicle tracking system ◦ Ride-sharing mobile app ◦ Turn-based digital board games ◦ 50+ Educational Games with CMS and LMS ◦ 500+ HTML5 Games ◦ 100+ Mobile Games ◦ And many more…

Web API Game Design C# Programming Software Architecture Unity 3D

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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

Web API PHP JavaScript Python Website Design

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Miles B.

5.0

4.3

100%

Sydney, Australia

$40 USD per hour

Australian professional software engineer. Highly proficient in C, C++, C#, Java. Experienced in Application Development, Embedded Systems and Web Backend.

Web API C Programming Windows Desktop Linux C# Programming

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How to hire a great freelance Web API Programmer

A Web API programmer builds and maintains the server-side endpoints that let applications, websites, and third-party services exchange data over HTTP. Hiring a skilled Web API developer means getting clean, documented, secure interfaces that power mobile apps, single-page applications, microservices, and integrations across your tech stack.

What a Web API programmer delivers

A freelance Web API programmer designs and ships the connective tissue between systems. Whether you need a REST API for a new mobile app, a GraphQL layer for a React front end, or middleware that brokers data between a CRM and an e-commerce store, this is the specialist who writes the code, defines the contracts, and ships the documentation.

Typical deliverables include endpoint specifications, authentication flows, request and response schemas, rate limiting, error handling, and the deployed API itself. A strong Web API developer also produces OpenAPI or Swagger documentation, Postman collections for testing, and unit and integration test suites that protect the API as it evolves.

Common tasks and services

Designing RESTful APIs and GraphQL schemas from business requirements

Building backend services in Node.js, Python (Django, Flask, FastAPI), PHP (Laravel), Ruby on Rails, Java (Spring Boot), or .NET

Implementing OAuth 2.0, JWT, API keys, and role-based access control

Integrating third-party APIs such as Stripe, Twilio, PayPal, Shopify, Salesforce, and Google Maps

Writing OpenAPI and Swagger specifications and publishing developer documentation

Setting up rate limiting, caching with Redis, and request validation

Building webhooks and event-driven endpoints

Migrating legacy SOAP services to REST or GraphQL

Containerizing APIs with Docker and deploying to AWS, Azure, GCP, or Heroku

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

Tools and technologies to look for

The Web API ecosystem is broad, and the right stack depends on your project. A capable API programmer should be fluent in HTTP fundamentals, JSON, and at least one major backend framework.

Languages and frameworks: Node.js with Express or NestJS, Python with FastAPI or Django REST Framework, Laravel, Spring Boot, ASP.NET Core, Ruby on Rails

API styles: REST, GraphQL (Apollo, Hasura), gRPC, WebSockets

Documentation and testing: Swagger, OpenAPI, Postman, Insomnia, Stoplight

Databases: PostgreSQL, MySQL, MongoDB, Redis, DynamoDB

Cloud and DevOps: AWS API Gateway, Lambda, Azure Functions, Google Cloud Run, Docker, Kubernetes, CI/CD pipelines

Security: OAuth 2.0, OpenID Connect, JWT, HTTPS/TLS, OWASP API Security Top 10

Industries and use cases

Web API development underpins almost every modern software product. SaaS companies hire API programmers to expose product features to customers and partners. E-commerce businesses need APIs to sync inventory, process payments, and connect storefronts to ERPs. Fintech, healthtech, logistics, real estate, and travel platforms all rely on well-built APIs to move data between mobile apps, web clients, and back-office systems. Startups commonly hire an API specialist to bootstrap an MVP, while established companies bring one on to refactor monoliths into microservices or to build public developer platforms.

How to evaluate Web API developer candidates

Look for engineers who can show shipped APIs in production, not just tutorials. Strong portfolio markers include public documentation they have authored, GitHub repositories with clean commit history, and experience with the specific stack your project will use. Ask for evidence of versioning strategies, error-handling conventions, and security practices.

Useful interview questions you can copy and use:

Walk me through how you would design a REST API for a multi-tenant SaaS product. How would you handle authentication and tenant isolation?

When would you choose GraphQL over REST, and what trade-offs come with that choice?

How do you version a public API without breaking existing clients?

Describe your approach to rate limiting, caching, and protecting an API against abuse.

How do you structure error responses, and what status codes do you return for validation failures versus server errors?

Why hire Web API programmers on Freelancer.com

Freelancer.com gives you access to a global community of backend engineers and API specialists across every major language and framework. You can compare profiles, portfolios, and verified reviews before you commit. Whether you need a quick integration with a third-party service or a long-term engineer to architect a microservices platform, you can hire on Freelancer.com with confidence. Clients set their own budgets and receive competitive bids from freelancers on Freelancer.com, which keeps pricing flexible across project sizes and complexity levels.

Ready to ship clean, well-documented endpoints for your next product? Post a project on Freelancer.com today and connect with skilled Web API programmers ready to design, build, and deploy your APIs.

What are the steps to hiring a freelance Web API programmer?

Hiring an API developer works best when you treat the brief as a technical specification rather than a vague request. The clearer you are about endpoints, authentication, integrations, and the consuming clients, the better the bids you will receive. The process below walks through posting, reviewing, and awarding the project.

Step 1: Post your project on Freelancer.com

Your project post is the single biggest determinant of bid quality. A precise brief filters for candidates whose stack and experience genuinely match the work, so name the language, framework, integrations, and deliverables explicitly. 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.

Specify the API style required (REST, GraphQL, gRPC) and the backend language or framework

List the endpoints, resources, or integrations the API must support, including any third-party services such as Stripe, Twilio, or Salesforce

Describe the consuming clients — mobile app, web SPA, partner systems — and expected request volumes

Note authentication requirements (OAuth 2.0, JWT, API keys) and any compliance constraints such as HIPAA or PCI

State expected deliverables including OpenAPI documentation, Postman collection, test coverage, and deployment target

Provide a realistic timeline and indicate whether ongoing maintenance is in scope

Step 2: Review bids from freelancers

Bids are short proposals that reveal how each freelancer interprets your brief and what approach they would take. Read them carefully rather than sorting only by price. A strong API proposal references the specific framework, calls out architectural decisions, and raises sensible clarifying questions about authentication, data models, or rate limits.

Look for proposals that describe a concrete approach — for example, FastAPI with PostgreSQL and JWT auth deployed to AWS

Note whether the freelancer asks intelligent questions about edge cases, error handling, or versioning

Check that the proposed timeline accounts for testing, documentation, and deployment, not just coding

Favour bids that link to relevant GitHub repositories, published API documentation, or similar past projects

Use Freelancer.com chat to ask shortlisted candidates clarifying questions about their proposed stack and process

Step 3: Evaluate freelancers and award the project

The final decision combines proposal quality with profile evidence. For API work, you want consistency across multiple past projects — one polished demo is less reassuring than a track record of shipped, documented APIs with happy clients. Weigh portfolio depth, written reviews, and verified credentials together.

Review portfolio items showing real API documentation, code samples, or published developer portals

Check star ratings and the number of completed backend or API projects

Read written client reviews for comments on code quality, communication, and on-time delivery

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

Award the project to your chosen freelancer and use Freelancer.com's Milestone Payments to release funds as endpoints, documentation, and deployment milestones are delivered

How long does a Web API project take?

A simple CRUD API with a handful of endpoints can be built in one to two weeks, while a production-grade API with authentication, third-party integrations, documentation, and tests typically takes four to eight weeks. Larger microservices architectures or public developer platforms can run several months. The brief, scope, and required integrations are the biggest drivers of timeline.

What is the difference between a Web API programmer and a backend developer?

The roles overlap heavily. A backend developer handles the full server-side stack including databases, business logic, and APIs, while a Web API programmer specialises specifically in the design, implementation, and documentation of HTTP-based interfaces. If your project is primarily about exposing data and functionality to other apps or services, an API specialist is the focused hire.

Do I need REST or GraphQL for my project?

REST is the standard choice for most public APIs, simpler integrations, and CRUD-style resources. GraphQL is stronger when clients need flexible queries across related data, such as feeding a complex front end from a single endpoint. A good API programmer will recommend the right approach based on your client requirements and team experience.

Can I hire a Web API freelancer for a one-off integration?

Yes. Many clients post a project on Freelancer.com for a single integration, such as connecting their app to Stripe, syncing data with a CRM, or building a webhook handler. These engagements are well-suited to fixed-scope contracts with clear acceptance criteria.

Should I hire a freelancer or an agency for API work?

A skilled freelancer is usually the right fit for focused API builds, integrations, and ongoing maintenance because you get direct access to the engineer writing the code. Agencies make more sense when you need parallel teams across mobile, frontend, and backend at once. Most API projects benefit from the cost efficiency and communication of a freelance hire.