Hire the Best API Integration Professionals

Clients rate our API Integration Professionals
Rating is 4.7 out of 5.
4.7/5
Based on 27,005 client reviews
Moch Rizal E.

Surabaya, Indonesia

$5/hr
5.0
6 jobs

Building scalable web applications to grow your business ๐Ÿš€ by combining robust backend logic with interactive frontend design. I create systems that run smoothly, secure your data, and provide an effortless user experience. ๐Ÿ’ช Problem-solving approach (Focus on business logic, not just code) ๐Ÿ’Ž Clean & Scalable Code (Easy to maintain in the future) โšก High Performance (Fast loading & optimized database) ๐Ÿ› ๏ธ End-to-End Solution (Handling both Server & UI) ๐Ÿค Reliable Communication What I Can Do and How Fast? โœ… SaaS / Web App Development (~2-4 Weeks) โœ… Dashboard & Admin Panel (~1-2 Weeks) โœ… MVP (Minimum Viable Product) (~2 Weeks) โœ… API Development & Integration (~3-7 Days) โœ… Landing Page Development (~2-5 Days) โœ… Bug Fixing & Optimization (Hours - 2 Days) โœ… Database Design & Schema (~2-3 Days) โœ… Deployment & Server Setup (~1 Day) My Tech Stack: โญ Frontend: React, Next.js, Vue.js, TailwindCSS, TypeScript โญ Backend: Node.js, Laravel (PHP) โญ Database: MySQL, PostgreSQL, MongoDB Feel free to reach out to discuss your project requirements! ๐Ÿ”‘ KEYWORDS: Full Stack Developer, Web Developer, React Developer, Node.js Developer, Laravel Developer, Vue.js, Next.js, TypeScript, PHP, SaaS Development, Dashboard Application, CRM Development, API Integration, Backend Development, Frontend Development, Database Design, MVP Development, Web Application, Tailwind CSS, Admin Panel, Bug Fixing.

  • API Integration
  • JavaScript
  • React
  • Node.js
  • PHP
  • TypeScript
  • Tailwind CSS
  • MySQL
  • Database Design
  • HTML5
  • CSS 3
  • Website Optimization
  • SaaS
  • Laravel
  • Next.js
David C.

Sens, France

$40/hr
4.9
33 jobs

Still paying for tools that don't talk to each other? I build n8n automation workflows and API integrations that fix that โ€” cleanly, on infrastructure you own and control. No vendor lock-in, no recurring SaaS fees you can't escape. Most automation freelancers hand you a Zapier flow and disappear. I deploy self-hosted n8n on your VPS or cloud (Docker, Linux), wire it to your existing stack via REST APIs and webhooks, and leave you with code and infrastructure you fully own. That means no subscription surprises and no single point of failure you can't debug yourself. What I build for SMBs and SaaS startups: ๐Ÿ”— API & webhook integrations between any two platforms โš™๏ธ Automated workflows that replace manual ops work ๐Ÿ–ฅ๏ธ Self-hosted n8n setups on VPS or cloud (Docker, Linux) ๐Ÿค– AI agents and RAG chatbots connected to your live data ๐Ÿ“Š CRM, lead gen, and data pipeline automations ๐Ÿ” Web scraping and data enrichment pipelines โœ… 100% Job Success Score across 28 completed projects on Upwork โœ… Top Rated freelancer โ€” $57K+ earned, 11 active client engagements โœ… Clients include SaaS startups and SMBs across e-commerce, logistics, real estate, and recruitment โœ… Notion Service Specialist certified Send me a message describing what you're trying to automate. I'll reply within a few hours with a clear scope and whether I'm the right fit.

  • API Integration
  • API
  • API Development
  • n8n
  • Automation
  • AI Agent Development
  • RESTful API
  • Zapier
  • Make.com
  • Python
  • Artificial Intelligence
  • Data Scraping
  • PostgreSQL
  • Web Scraping
  • AI Chatbot
  • Retrieval Augmented Generation
  • Data Analysis
Deelaka A.

Sri Jayawardanapura Kotte, Sri Lanka

$35/hr
4.5
11 jobs

Are you losing hours every week to manual tasks, broken integrations, or slow workflows? I build intelligent automation systems powered by Claude AI and Make that handle the work for you, reliably and at scale. I specialize in combining AI (Claude, OpenAI) with no-code/low-code automation platforms to create workflows that don't just move data, they think. Whether you need an AI agent that reads, summarizes, and acts on incoming data, or a complex multi-system integration, I design and deliver production-ready solutions. CLAUDE AI AND LLM-POWERED AUTOMATION Intelligent AI agents integrated into your business workflows Claude API connected to CRMs, databases, email, and messaging tools AI document processing, summarization, classification and routing Custom AI assistants that respond, decide, and trigger actions automatically MAKE AND WORKFLOW AUTOMATION Advanced multi-step Make scenarios with webhooks, error handling, and retries API to Make to Database pipelines CRM, lead management, and marketing automation Reduce manual work by 70-90% API DEVELOPMENT AND INTEGRATION REST API development in Java and Node.js Secure OAuth2 and token-based authentication Third-party integrations including payment gateways, social APIs, and SaaS platforms Microservices and system-to-system communication CLOUD AND BACKEND ENGINEERING Scalable backend services using Java and Spring Boot AWS deployments including Lambda, EC2, and S3 CI/CD pipelines and production-ready infrastructure WHY CLIENTS CHOOSE ME 100% Job Success Score AWS Certified Solutions Architect Make Certified in Foundation, Basics, and Intermediate Fast response under 4 hours and clear communication Clean, maintainable code, not quick hacks Long-term support and continuous improvements I don't just connect apps. I build systems that think, adapt, and scale with your business. Let's talk about what you're trying to automate.

  • API Integration
  • Make.com
  • Java
  • RESTful Architecture
  • Web Application
  • Automation
  • Amazon Web Services
  • React
  • Web Development
  • Hosting Setup
Blaine A.

Tacoma, Washington

$135/hr
5.0
15 jobs

I'm a senior software engineer with extensive experience building scalable APIs, cloud platforms, and mobile applications used by billions of users. Iโ€™ve worked on production systems at companies like Meta Platforms and T-Mobile, and I bring that same engineering discipline and reliability to every client project. Throughout my career Iโ€™ve designed and built backend systems, microservices, and mobile applications that power real products. I specialize in building software that is not only functional but also scalable, maintainable, and ready for long-term growth. In addition to enterprise experience, Iโ€™ve also worked extensively with startups and small teams, helping them move quickly from concept to working software. I understand the balance between moving fast and building systems that wonโ€™t break as your product grows. Whether you're launching a new product, building an MVP, integrating APIs, or improving an existing platform, I focus on delivering solutions that are reliable, efficient, and designed with best engineering practices. What I Can Help You Build Backend & API Development โ€ข REST APIs and microservices โ€ข Backend platforms and system architecture โ€ข Secure authentication systems (OAuth, Cognito, etc.) โ€ข Third-party API integrations โ€ข High-performance backend services Cloud & Infrastructure โ€ข AWS architecture and deployment โ€ข Serverless systems (Lambda, event-driven systems) โ€ข Scalable cloud platforms โ€ข Database design and optimization โ€ข DevOps and deployment pipelines Mobile Applications โ€ข Cross-platform mobile apps using Flutter โ€ข API integration for mobile apps โ€ข Authentication, file uploads, and backend communication โ€ข Performance optimization and debugging Technologies I Work With Python โ€ข C# โ€ข Flutter โ€ข REST APIs โ€ข AWS โ€ข Serverless โ€ข PostgreSQL โ€ข MongoDB โ€ข Microservices โ€ข Cloud Architecture โ€ข Docker โ€ข Event-Driven Systems Recent Types of Projects โ€ข Designing backend APIs that support mobile applications โ€ข Building serverless cloud systems on AWS โ€ข Creating MVP platforms for startups โ€ข Integrating complex third-party APIs โ€ข Optimizing backend performance and reliability โ€ข Debugging and stabilizing production systems Why Clients Work With Me Clients hire me because I bring both enterprise engineering experience and startup speed. I understand how to quickly identify the core problem and deliver solutions that work in production. You can expect: โ€ข Clear and professional communication โ€ข Clean, maintainable code โ€ข Thoughtful system design โ€ข Reliable delivery and follow-through I treat every project like a product that will need to scale and evolve over time, not just a quick patch or temporary solution. Education Masterโ€™s Degree โ€“ Computer Science Bachelorโ€™s Degree โ€“ Computer Science If you're looking for an experienced engineer who can help you build, scale, or improve your software, I'd be happy to learn more about your project.

  • API Integration
  • API Development
  • Web Development
  • Mobile App
  • Software Architecture
  • Cloud Architecture
  • iOS Development
  • Software Development
  • Python
  • Node.js
  • NoSQL Database
  • SQL
  • Flutter
  • NodeJS Framework
  • TypeScript
  • Full-Stack Development
  • Android App
  • Native App Development
  • SaaS Development
Kezia Regina Putri Tanaga K.

Semarang, Indonesia

$25/hr
5.0
34 jobs

Top-rated full stack developer with 100% Job Success and $20k+ earned on Upwork. Specializing in React, Next.js, and Laravel. I've worked across SaaS platforms, product dashboards, API-driven systems, and frontend architecture. Mostly alongside startup teams and agencies who need reliable execution, not hand-holding. What I typically work on: โœ” React / Next.js web application development โœ” SaaS product builds and feature iteration โœ” Laravel backend development and API integration โœ” Dashboards, admin panels, and internal tool โœ” Frontend cleanup, enhancement, and optimization โœ” Stepping into codebases and improving them โœ” Bug fixing, performance improvements, and maintenance โœ” Database design and scalable backend workflows Why clients hire me: โœ” Strong frontend + backend execution โœ” Clean communication and dependable delivery โœ” Fast onboarding into existing projects โœ” Practical solutions focused on business results Need a developer who can handle both frontend and backend without hand-holding? Send me the project details and I'll tell you exactly how I'd approach it.

  • API Integration
  • React
  • Next.js
  • TypeScript
  • Laravel
  • REST API
  • PHP
  • Vue.js
  • Web Development
  • MySQL
  • JavaScript
  • SaaS
  • Database Design
  • Tailwind CSS
  • SaaS Development
Satyam S.

Lucknow, India

$20/hr
4.9
59 jobs

Still manually moving data between your CRM, Google Sheets, Airtable, Notion, HubSpot, Pipedrive, or some collection of tools that seemed like a good idea six months ago? At some point every growing business accidentally hires a full time employee called Copy and Paste. A lead comes in. | Someone updates the CRM. | Someone updates the spreadsheet. | Someone sends the email. | Someone books the meeting. | Then an automation breaks, and someone loses an afternoon fixing it. Most businesses do not have a people problem. They have a workflow problem. That is where I come in. I am a Top Rated AI Integration Expert and Full Stack AI Engineer with 50 completed Upwork projects, a 100% Job Success Score, Microsoft Certified AI Engineer (AI-102), and certified n8n Expert. Want proof before you spend anything? Send me a message or an invite with the tools in your stack and where it hurts. Within 24 hours I will send you a free personalized Loom audit with the two or three fastest automation wins I can see. No pitch, no obligation. If the ideas are useful, we talk. If not, you keep the ideas. I help startups, agencies, and SaaS companies build AI powered products, automate business operations, integrate CRMs, and ship production ready backend systems. Recent builds include a WhatsApp AI agent that answers travel inquiries and books trips 24/7, salon operations automation on n8n, an AI property damage assessment pipeline, and automated price monitoring with Zapier and Browse.ai. Your team gets back to thinking, deciding, and selling. Anything except updating the same CRM record for the fifth time. MY EXPERTISE โ€ข AI Integration and AI Automation โ€ข AI Agent Development โ€ข AI Appointment Setters โ€ข Lead Generation and Qualification Automation โ€ข Customer Support Automation โ€ข Sales and Marketing Automation โ€ข Business Process Automation โ€ข CRM Automation and SaaS Automation AI & LLM DEVELOPMENT โ€ข OpenAI API Integration and ChatGPT Integration โ€ข Claude API and Gemini API โ€ข MCP Servers (Model Context Protocol) โ€ข LangChain and LangGraph โ€ข LLM Integration โ€ข Retrieval Augmented Generation (RAG) and Knowledge Base Chatbots โ€ข AI Chatbot Development โ€ข Document Processing and Data Extraction โ€ข Claude Code and Lovable WORKFLOW AUTOMATION PLATFORMS โ€ข n8n and Self Hosted n8n Expert โ€ข Make โ€ข Zapier โ€ข Pipedream BUSINESS SYSTEMS & INTEGRATIONS โ€ข Airtable Automation โ€ข Google Sheets Automation โ€ข Notion Automation โ€ข HubSpot Integration โ€ข GoHighLevel Development โ€ข Pipedrive Automation โ€ข ClickUp Automation โ€ข Asana Automation โ€ข Slack Integration โ€ข Calendly Integration โ€ข WhatsApp Automation and WhatsApp AI Agents โ€ข QuickBooks Automation โ€ข BotPress BACKEND & SAAS DEVELOPMENT Most automation freelancers stop once two apps are talking to each other. I usually start there, because the hard part is not connecting tools. It is making sure they keep working next month, and after somebody changes a field name at 2 AM and forgets to tell anyone. I am a full stack engineer first, so your automations come with error handling, retries, logging, and documentation. โ€ข Backend Development and Full Stack Development โ€ข AI SaaS Development โ€ข API Integration, Webhook Integration, Third Party Integrations โ€ข NestJS, Express.js, Node.js, FastAPI โ€ข PostgreSQL, MongoDB, Supabase โ€ข MERN and PERN Stack โ€ข Golang, Docker, GitHub, AWS, Microservices Systems I have built have automated thousands of repetitive operations, streamlined lead processing, reduced operational workload, and cut customer response times from hours to minutes. A recent client put it better than I can: "I highly recommend Satyam. He cares about the quality of his work and delivered everything and more. I will hire again." I work with startups, agencies, and SaaS companies across the US, UK, Europe, Australia, and the Middle East. Available across EST, CST, PST, GMT, and other overlapping time zones, and I usually reply within a few hours. Flexible with project based work, ongoing engagements, part time support, and long term contracts. So if you are spending your weekdays, or worse, your weekends, manually updating CRMs, moving data between tools, fixing broken automations, chasing leads, or wondering why your fully automated system needs three people to keep it alive... Then it is time we had a little chit-chat. Message me, and your free Loom audit is on its way.

  • API Integration
  • API
  • API Development
  • AI Development
  • Full-Stack Development
  • Back-End Development
  • SaaS Development
  • AI Agent Development
  • Automation
  • n8n
  • Make.com
  • Zapier
  • AI Chatbot
  • Google Sheets Automation
  • JavaScript
  • Python
  • Node.js
  • ChatGPT
  • OpenAI API
  • Claude

How it works

Post a job for freePost a job

Tell us what you need. Create your own job post or generate one with AI then filter talent matches.

Hire top talent fast

Consult, interview, and hire quickly, so you can meet the freelancers you're excited about.

Collaborate easily

Use Upwork to chat or video call, share files, and track project progress right from the app.

Payment simplified

Manage payments in one place with flexible billing options. Only pay for approved work, hourly or by milestone.

Don't just take our word for it

How do I hire a API Integration Freelancer on Upwork?

You can hire a API Integration Freelancer on Upwork in four simple steps:

  • Create a job post tailored to your API Integration Freelancer project scope. Weโ€™ll walk you through the process step by step.
  • Browse top API Integration Freelancer talent on Upwork and invite them to your project.
  • Once the proposals start flowing in, create a shortlist of top API Integration Freelancer profiles and interview.
  • Hire the right API Integration Freelancer for your project from Upwork, the worldโ€™s largest work marketplace.

At Upwork, we believe talent staffing should be easy.

How much does it cost to hire a API Integration Freelancer?

Rates charged by API Integration Freelancers on Upwork can vary with a number of factors including experience, location, and market conditions. See hourly rates for in-demand skills on Upwork.

Why hire a API Integration Freelancer on Upwork?

As the worldโ€™s work marketplace, we connect highly-skilled freelance API Integration Freelancers and businesses and help them build trusted, long-term relationships so they can achieve more together. Let us help you build the dream API Integration Freelancer team you need to succeed.

Can I hire a API Integration Freelancer within 24 hours on Upwork?

Depending on availability and the quality of your job post, itโ€™s entirely possible to sign up for Upwork and receive API Integration Freelancer proposals within 24 hours of posting a job description.