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Top freelance API Integration developers available to hire
Freelance API Integration Developer5.0 (59 reviews)
Seasoned Web Developer and Blockchain enthusiast with a proven track record in the IT and services industry. Expertise in Research, PHP, HTML, JavaScript, and Blockchain development, including Smart Contracts. Skilled in automation, application testing, and cybersecurity analysis for web and mobile apps.
Freelance API Integration Developer5.0 (45 reviews)
Senior Full‑Stack Developer with over seven years’ experience designing, building and maintaining large‑scale web applications.
Track record of delivering end‑to‑end solutions by partnering with stakeholders to translate business and user needs into reliable software.
Committed to clean, maintainable code, performance tuning, security best practices, and automated CI/CD pipelines.
Nearly two years of hands‑on AI experience, integrating machine learning models and automation to boost product intelligence.
I’ve contributed as a developer at global leaders Adobe and Newgen, as well as at high‑growth startups MoveInSync and Zillious Solutions.
Skills
Advanced:
Java, MySQL, PostgreSQL, Spring, Hibernate, Spring Boot, Maven/Gradle, Microservices, Multithreading & Concurrency Control, Web Services (SOAP & REST), RPC, Git, Google Cloud Platform (GCP), Database Modeling & Schema Design, SQL (Stored Procedures/Functions, Triggers), Docker, Kubernetes.
Intermediate:
TypeScript, Python, Angular, React, API Gateway, Service Discovery, Load Balancer, ELK Stack, Kafka, RabbitMQ, Redis Cache, RAG (Retrieval-Augmented Generation), AI Agents, LangGraph, Vector Databases, AI Workflows, Fine‑Tuning.
Core Strengths:
Scalable system design, back‑end architecture, data structures & algorithms.
How I Can Help You
– I’m here to tackle your toughest technical challenges with expertise and dedication.
Special Offer
– Enjoy your first session free! (Terms & Conditions apply — let’s discuss your needs during our requirement-gathering call.)
Satisfaction Guaranteed
– Not satisfied? Request an instant refund, no questions asked.
For a comprehensive overview of additional technologies and frameworks tailored to your needs, please refer to the Expertise section of my profile.
Freelance API Integration Developer5.0 (17 reviews)
Recently back on codementor, now I'm fulltime self-employed so I have time for clients again!
Technical Lead, I love to teach and help others and actually this site really suits my spare time. I'll try keep my costs low so you guys can use me as much as you need.
I can help with full projects, problem solving and mentoring.
I am patient and do not discriminate, if you struggle with English that isn't a problem, I will try my best to help. Any age, gender or background you will be treated like all my other students.
Languages: English, French
Freelance API Integration Developer5.0 (259 reviews)
With over 15 years of experience across software engineering, architecture, and product leadership, I specialize in building high-performing engineering teams, architecting scalable systems, and driving strategic product delivery. As a Tech Lead and adjunct faculty member, I combine hands-on technical expertise with leadership, mentorship, and education to deliver enterprise-grade solutions while developing the next generation of engineers.
Technology Stack:
Mobile & Web: Flutter/Dart, React, Multi-tenant Architectures
Cloud & Backend: AWS (AppSync, Amplify, Lambda), Firebase, GraphQL, REST APIs
Languages: C/C++/C#, Dart, Java, Python, JavaScript/TypeScript
Specialized: IoT, Embedded Systems, Edge AI, Information Security
Architecture: Clean Architecture, Microservices, Event-Driven Systems
Leadership & Roles:
Tech Lead / Chapter Lead – Leading cross-functional teams of 8+ engineers
Product & Engineering Manager – Driving product strategy and delivery
Solutions Architect – Designing enterprise systems and multi-tenant platforms
Educator & Mentor – Adjunct faculty + 300+ mentees on Codementor
Key Expertise:
Teaching computer science fundamentals and advanced topics
Leading distributed engineering teams and establishing technical standards
Architecting and delivering complex SaaS platforms
Strategic product roadmapping and stakeholder management
Building developer assessment frameworks and quality systems
Mentoring engineers from junior to senior levels
Educational Background:
PhD Candidate, Computer Engineering (Edge AI Research)
Master of Computer Engineering
Master of Business Administration (MBA)
Postgraduate Diploma, Software Development Skills (UNIX)
Bachelor of Computer and Information Sciences
Current Focus:
Building scalable multi-tenant platforms, AI-driven development workflows, team capability development, and strategic consulting and education.
* 15+ years of experience in software development.
* 7 years of building apps with NodeJS, React and Angular.
* 5 years of hands-on work with cloud-based.
* Solid background in computer science and software development.
* Proficient in important practices like Clean Code, Refactoring, Test Automation, and CI/CD.
* Exceptional at solving problems and learning new technologies quickly.
With over a decade of experience in full-stack development, I specialize in **Ruby on Rails, custom eCommerce solutions** (Spree, Solidus), **ReactJS**, and **DevOps**. My expertise spans designing and developing scalable, distributed cloud-based applications with a strong foundation in **database architecture** and **system refactoring**.
As a technology leader, I’ve successfully delivered complex, high-impact projects across industries including **Real Estate, Finance, Healthcare, Marketing**, and **eCommerce**. My portfolio includes building sophisticated eCommerce marketplaces, **SaaS platforms**, and multi-channel selling applications. I am passionate about crafting innovative, robust software solutions tailored to meet diverse business needs.
**Key Expertise:**
- **Backend:** Ruby on Rails, building and scaling RESTful APIs.
- **Frontend:** ReactJS, JavaScript, responsive UIs with Tailwind CSS, and Bootstrap.
- **eCommerce Solutions:** Spree, Solidus, custom marketplaces, multi-tenant SaaS platforms.
- **Database Architecture:** MySQL, PostgreSQL, MongoDB, Redis, Cassandra, optimized for high performance and scalability.
- **DevOps:** CI/CD pipelines (CircleCI, AWS Pipeline), containerization (Docker), cloud platforms (AWS, GCP, Heroku, DigitalOcean).
- **Test-Driven Development:** Expertise in TDD using RSpec, ensuring high code quality and maintainability.
In addition to my technical expertise, I have a strong commitment to **open-source contributions** and have developed multiple **Ruby/Rails/Spree extensions**. I also bring a wealth of experience in **refactoring legacy code bases**, implementing **performance optimisation**, and improving **scalability** and **security**.
My passion lies in helping businesses unlock their full potential through technology, and I am always eager to collaborate on long-term, impactful projects.
Let’s build the future, one line of code at a time.
Best regards,
Rahul Singh
Freelance API Integration Developer5.0 (53 reviews)
I'm Tom, an AI SaaS founder with 8+ years across Python, Go, Java, JavaScript, and C#. I've run 800+ mentoring sessions with a 5.0-star rating across 53 reviews.
I mentor hands-on: we look at your actual code, find what's broken, and fix it together. No hand-waving, no generic "just use AI" advice.
What I help with: AI/LLM app development (integrations, agents, automation), Python and Go debugging and architecture, dev-to-AI career transition, and indie hacker / SaaS building. Currently building an AI tool for X/Twitter growth in public, day 200+.
Freelance API Integration Developer5.0 (4 reviews)
I do it all, I do iOS (swift and Obj C) , Android (Kotlin and Java), front end (I use my own JS framework, although I know vue or react), and Node Js for my back end, I prefer MongoDB, but I can use SQL like Postgres, Been programming for nearly 20 years so I know the ups and downs. I have clone Uber, Twitter , Tinder and other major apps for clients, like "tinder for job matching between employers and candidates".
**I'm Karan, a Senior Mobile Engineer with 9+ years of experience designing and delivering scalable, production-grade mobile applications across iOS and cross-platform ecosystems. I've successfully shipped 50+ applications spanning healthcare, fintech, social networking, education, travel, staffing, AI, and enterprise platforms.**
**My expertise includes Swift, SwiftUI, React Native, Flutter, Firebase, Supabase, JavaScript, Node.js, and REST APIs, with extensive experience building cloud-connected mobile systems, scalable backend integrations, and high-performance user experiences.**
**I have strong experience developing AI-powered applications using OpenAI APIs, OCR pipelines, real-time communication features, push notifications, analytics, secure authentication, payment integrations, and production-ready mobile architectures. I've worked on real-time systems involving WebRTC, WebSockets, Socket.IO, Firebase real-time services, and low-latency communication workflows for modern mobile applications.**
I enjoy owning products end-to-end, from architecture and backend integrations to App Store deployment, performance optimization, scalability, and long-term maintenance. I focus on writing clean, maintainable code while delivering reliable applications that perform well in production for startups and enterprise clients.
**Senior Mobile Engineer | iOS Developer | Swift & SwiftUI | React Native | Flutter | WebRTC | WebSockets | Socket.IO | Voice & Real-Time Systems | Firebase | Supabase | OpenAI API | AI Integration | REST APIs | OCR | Mobile Architecture | Performance Optimization | App Store Deployment | 50+ Production Apps | 9+ Years Experience**
Freelance API Integration Developer5.0 (204 reviews)
I am a seasoned IT professional with extensive expertise in Python and JavaScript development, proficiently delivering scalable and efficient solutions. My proficiency extends to DevOps practices, where I excel in automating deployment pipelines, ensuring seamless integration, and enhancing overall efficiency. Leveraging cloud technologies, I specialize in designing and implementing robust, scalable, and secure solutions on major cloud platforms. With a solid foundation in both development and DevOps, I bring a holistic approach to building and maintaining cutting-edge applications in cloud environments.
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STEP 3
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Frequently asked questions
How long do API Integration projects normally take?
The length of a project depends on many factors, including the scope of your project and the technical complexity of it. When you post a freelance API Integration project request on Codementor, you’ll have the option to indicate when you’d expect the project to be completed. We suggest chatting with the interested developers to ensure both sides are on the same page. For more information on how to post a freelance API Integration request on Codementor, check out our article.
How much does it cost to hire a freelance API Integration developer?
We don’t charge anything when you post a freelance hiring request for API Integration developers! You’ll have the chance to determine what the budget for your project is when you post the request. You’ll only need to pay the developer if you’re 100% satisfied with their work. Please know that Codementor charges a small service fee when a developer completes the job.
What makes Codementor API Integration developers different?
We do a comprehensive technical and communications screen of all API Integration developers at Codementor. Our network includes book authors, popular open source contributors, top Stack Overflow users and engineers at top tech companies. In addition, to continually ensure the quality of our freelancers, we regularly check in on existing API Integration developers’ user satisfaction rates.
What happens if I’m not happy with the freelancer’s work?
As a platform, we strive to ensure you’re always happy with your API Integration project’s results. If you’re unsatisfied with the results, you can choose to get a refund for the project. Additionally, you can contact our support team should you need any further assistance with your project.
For more answers to frequently asked questions, see here.
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