API Integration Experts For Hire
Showing 636 results
Sponsored Freelancers
-
Hire novaascend
Some of our clients have hired us three and four times. That's the part we're proudest of. We're a digital agency that takes you from first idea to launch day, including your store or website, your app, the AI behind it and the brand in front of it. 4.9★ across 90+ reviews, Preferred Freelancer, and one point of...Some of our clients have hired us three and four times. That's the part we're proudest of. We're a digital agency that takes you from first idea to launch day, including your store or website, your app, the AI behind it and the brand in front of it. 4.9★ across 90+ reviews, Preferred Freelancer, and one point of contact from brief to delivery. If your idea has a catch, you'll hear it from us before you pay, not after. WHAT WE BUILD - Online stores that sell (Shopify, WooCommerce, Custom) - Web apps, mobile apps and custom tools (quote engines, RFQ systems, dashboards) - Integrations that connect your systems (Stripe, APIs, ERP) - AI features and automation (chatbots, OpenAI, workflows) - Design and branding (logos, brochures, packaging, social) WHY CLIENTS STAY - Fast replies and fast edits - Written scope, milestone dates and weekly updates - You own your hosting, store and billing, and we hand access back at delivery - Support after launch, not just before it YOUR TIME ZONE We work with clients in the US, UK/Europe, the Middle East and Australia. We set overlap hours that fit your day. Updates come in writing, so nothing waits on a call. Got a project, a problem or just a rough idea? Message us your goal and deadline. We'll reply with a plan, a price and honest advice. less -
Hire iosifpeterfi
CompTIA Security+ and Microsoft MCSE/MCSA/MCITP certified, with 15+ years of experience, 100+ delivered projects, and a 4.9 Freelancer rating across 101 reviews. I help businesses build, improve, and maintain software and infrastructure they can rely on. Clients usually come to me when they need someone who can take...CompTIA Security+ and Microsoft MCSE/MCSA/MCITP certified, with 15+ years of experience, 100+ delivered projects, and a 4.9 Freelancer rating across 101 reviews. I help businesses build, improve, and maintain software and infrastructure they can rely on. Clients usually come to me when they need someone who can take ownership—not just complete isolated technical tasks. I help launch new platforms, modernize existing systems, improve reliability and performance, automate operations, and solve problems that are slowing the business down. My focus is always the outcome: stable systems, smoother operations, less downtime, easier maintenance, and a setup that can grow with the business. I'm based in Germany and communicate fluently in English (C2), German (C1), and Romanian (native). I also operate my own hosting infrastructure, which can be useful for development, staging, testing, and deployment when a project needs it. You can expect clear communication, realistic commitments, and dependable follow-through. I'm also available after delivery for ongoing development, maintenance, monitoring, improvements, and long-term technical support. If you need someone experienced who can take responsibility for the technical side and stay involved long-term, I'd be glad to help. less -
Hire Hrolgar
I'm a backend engineer with a full-time role in the Norwegian financial sector, building production .NET systems where reliability and correctness aren't optional. I freelance on focused project work where the job is to solve a real problem and ship something that works. You get someone who reads the spec properly,...I'm a backend engineer with a full-time role in the Norwegian financial sector, building production .NET systems where reliability and correctness aren't optional. I freelance on focused project work where the job is to solve a real problem and ship something that works. You get someone who reads the spec properly, asks the right questions, and hands back clean code without needing to be managed. My background is enterprise software: C#/.NET, ASP.NET Core, Entity Framework, background services, and the kind of API and data work that has to survive real users and real money. I bring that same standard to freelance projects: clean architecture, sensible error handling, and no shortcuts that bite you in production. What I build: • APIs and integrations. REST API design, third-party platform integrations, OAuth, webhooks, payment and booking flows. If it needs to talk to another system reliably, that's my lane. • C#/.NET backends. ASP.NET Core services, EF Core, migrations, background jobs and scheduled workers. • Python backends and automation. FastAPI services, data pipelines, scrapers, and automation scripts. Practical Python that does a job, not a science project. • SaaS and web apps. Full-stack work with React front-ends on Python or .NET backends, including multi-tenant systems and property-management and channel-sync platforms with live third-party data. • AI integrations. Assistants and MCP servers that answer from your own database or documents instead of guessing, and AI steps inside workflows you already run, with every query logged. • Infrastructure. Docker, Ansible and OpenTofu, high-availability database clusters, CI/CD and monitoring, so the thing I build keeps running after handover. • Web automation and browser extensions. Chrome (Manifest V3) extensions and Playwright automation for sites and web apps you have access to. How I work: I scope honestly up front. If something's a bad idea, I'll tell you before you pay for it. I favour the simplest solution that solves the actual problem over the most impressive-looking one. Communication is clear and async, no daily standups required and no chasing me for updates. A good share of my clients here come back for another project. From my latest large project: "Helgi embraced every challenge and consistently delivered beyond our expectations." If you've got a backend, API, integration, or automation problem, send me the details. I'll tell you straight whether I'm the right fit, what it'll take, and how long. less -
Hire AwaisChaudhry
We are ZAWN Tech, a software and engineering team helping businesses turn complex ideas into reliable, production-ready products. Since 2014, we have delivered web platforms, mobile applications, SaaS products, AI/ML solutions, enterprise systems, automation, blockchain applications, IoT/embedded systems, and custom...We are ZAWN Tech, a software and engineering team helping businesses turn complex ideas into reliable, production-ready products. Since 2014, we have delivered web platforms, mobile applications, SaaS products, AI/ML solutions, enterprise systems, automation, blockchain applications, IoT/embedded systems, and custom software for clients worldwide. With 350+ client reviews, a 4.9/5 rating, 95% on-time delivery, and 99% on-budget performance, our focus is simple: understand the business problem, build the right technical solution, and deliver it reliably. What we specialize in • AI & Machine Learning — computer vision, AI applications, automation, LLM integrations • Web & SaaS — React, Next.js, Node.js, Python, PHP and custom platforms • Mobile Apps — iOS, Android and cross-platform applications • Enterprise Software — business management systems, APIs, integrations and automation • Blockchain & Web3 — smart contracts, wallets, exchanges and custom blockchain solutions • IoT & Engineering — connected devices, embedded systems and industrial applications • Cloud & DevOps — deployment, infrastructure, APIs, databases and scalable architectures Why clients work with us ✅ 10+ years of experience on Freelancer ✅ 349+ completed client reviews ✅ 4.9/5 overall rating ✅ 95% on-time delivery ✅ 99% on-budget delivery ✅ Experienced multi-disciplinary technical team ✅ Full project lifecycle — strategy → design → development → testing → deployment → support We are particularly suited to projects where technical complexity, reliability and long-term maintainability matter. If you have an idea, an existing product that needs improvement, or a complex system that needs to be built from scratch, send us the requirements and we'll help you determine the best technical approach. less -
Hire juanpablomacf
I transform complex business challenges into scalable AI solutions that deliver measurable results. With over a decade of experience in both full-stack development and AI implementation, I bridge the gap between ambitious ideas and production-ready systems. 🏆 Proven Impact Across Industries FinTech: Built trading...I transform complex business challenges into scalable AI solutions that deliver measurable results. With over a decade of experience in both full-stack development and AI implementation, I bridge the gap between ambitious ideas and production-ready systems. 🏆 Proven Impact Across Industries FinTech: Built trading dashboards processing 50,000+ daily transactions with real-time analytics MedTech: Developed AI diagnostic assistants that reduced analysis time by 65% LegalTech: Implemented RAG systems that cut legal research from hours to minutes SaaS: Scaled platforms from MVP to 100,000+ users with integrated AI capabilities 🔧 Technical Expertise AI & Machine Learning AI Agent Systems: Multi-step reasoning and workflow orchestration RAG Pipelines: LangChain, LlamaIndex, Pinecone, ChromaDB (95%+ retrieval accuracy) LLM Integrations: GPT-4, Claude 3, LLaMA fine-tuning and optimization Voice AI: Twilio integration and real-time call processing Full-Stack Development Frontend: React/Next.js, TypeScript Backend: Node.js, Python, FastAPI DevOps: AWS, Docker, Kubernetes, CI/CD pipelines Automation: n8n workflows, custom API integrations 🚀 Recent Deliverables • AI Customer Support: Reduced ticket volume by 75% with bots handling 15,000+ monthly conversations • Document Intelligence: Built legal document analysis that cut review time from 4 hours to 15 minutes • Trading Analytics: Delivered real-time dashboards with 99.9% uptime for financial clients • Workflow Automation: Saved 200+ manual hours monthly through n8n-powered processes 🎯 My Approach Strategy & Planning Technical feasibility analysis and ROI-focused project scoping Scalable architecture design for long-term growth Execution & Delivery AI-enhanced development using Cursor and Copilot Agile methodology with transparent weekly progress updates Comprehensive testing and quality assurance Production Excellence Robust monitoring, logging, and error handling Performance optimization and thorough documentation 📈 Why Choose Senior Expertise? I architect systems that scale, implementing proper error handling, security protocols, and maintainable codebases. My clients avoid technical debt while accelerating their AI roadmap with production-ready solutions. I'm available for full-time engagements and ready to discuss how I can help bring your AI vision to life. less -
Hire Herculesz
Principal / Head AI & Full-Stack Engineer with 25+ years of experience architecting, building, and scaling complex software systems across web, mobile, cloud, CMS/eCommerce, and AI-driven platforms. I specialize in delivering production-ready applications from concept to launch, including SaaS platforms, marketplaces,...Principal / Head AI & Full-Stack Engineer with 25+ years of experience architecting, building, and scaling complex software systems across web, mobile, cloud, CMS/eCommerce, and AI-driven platforms. I specialize in delivering production-ready applications from concept to launch, including SaaS platforms, marketplaces, admin dashboards, mobile applications, automation systems, APIs, CMS websites, eCommerce stores, and intelligent AI-powered workflows. I bring a strong combination of full-stack engineering, cloud architecture, DevOps, CMS/eCommerce development, and AI/LLM expertise, with a proven ability to transform complex business requirements into scalable, secure, and user-focused digital products. My experience covers frontend architecture, backend engineering, database design, third-party integrations, real-time systems, performance optimization, CI/CD, observability, and production deployment. Technical Expertise: Frontend: React, Next.js, Vue.js, TypeScript, JavaScript, Tailwind CSS, Material UI, responsive UI/UX implementation Backend: Node.js, NestJS, Express.js, Laravel, PHP, Python, REST APIs, GraphQL, microservices, server-side architecture Mobile: Flutter, React Native, Expo, iOS, Android, cross-platform mobile app development CMS & eCommerce: WordPress, WooCommerce, Shopify, Wix, Webflow, custom theme development, plugin/app integrations, payment setup, product catalogs, checkout flows, landing pages, blog systems, and SEO-friendly website architecture Databases: PostgreSQL, MySQL, MongoDB, Firebase Firestore, Supabase, Redis, database design, optimization, migrations, and data modeling Cloud & DevOps: AWS, Google Cloud, Azure, DigitalOcean, Docker, Kubernetes, Nginx, CI/CD, GitHub Actions, server deployment, monitoring, logging, and observability AI & LLMs: OpenAI API, LangChain, RAG pipelines, AI copilots, conversational agents, semantic search, embeddings, prompt engineering, fine-tuning, Pinecone, pgvector, vector databases, and agentic workflows Payments & Integrations: Stripe, PayPal, Twilio, SendGrid, Firebase, Google APIs, third-party APIs, webhooks, CRM integrations, automation platforms, and API-based business workflows I have a strong track record of designing and delivering scalable SaaS platforms, marketplace systems, mobile apps, admin dashboards, CMS websites, eCommerce stores, automation tools, and AI-driven products that support real business operations. My work combines clean frontend experiences, secure backend systems, optimized databases, cloud-ready infrastructure, flexible CMS solutions, and practical AI innovation. As a hands-on technical leader, I am experienced in mentoring engineers, leading cross-functional teams, making architecture decisions, and aligning technical execution with business goals. I am passionate about building high-quality software that is scalable, maintainable, and ready for real-world users. less -
Hire johnnier3
Hi, I'm Johnnie Reece, a Preferred Freelancer and senior full-stack engineer. For 10+ years I've shipped web, mobile, and emerging tech for startups and Fortune 500 companies, on time and without surprises. What I build: - Pixel-perfect web and mobile apps (React, Next.js, React Native, Flutter) scoring 98-100 on...Hi, I'm Johnnie Reece, a Preferred Freelancer and senior full-stack engineer. For 10+ years I've shipped web, mobile, and emerging tech for startups and Fortune 500 companies, on time and without surprises. What I build: - Pixel-perfect web and mobile apps (React, Next.js, React Native, Flutter) scoring 98-100 on Lighthouse - Secure, scalable backends in Node.js/NestJS, Java/Spring Boot, .NET, and Python - High-performance Shopify and WordPress stores, custom apps, and headless setups - Blockchain dApps, smart contracts, and Web3 integrations - Automation bots, scrapers, and AI workflows - AWS infrastructure with 99.99%+ uptime and auto-scaling How I work: Daily updates, live demos, direct access (no middlemen). I act as your technical partner, flagging risks early and writing clean, documented code built to last. Clients come back because I ship faster, cleaner, and more reliably. Ready to start? Message me. I reply fast and can begin immediately. less -
Hire vasundhara19
📌13+ Years Experience • 4.9★ Rating • 179 Freelancer Reviews • Certified Developers Vasundhara Solutions Lab LLP 🚀 builds AI-powered applications, mobile apps, SaaS platforms, full-stack web applications, APIs, and scalable custom software. Our expertise includes AI Development, Generative AI, LLMs, RAG, AI Agents,...📌13+ Years Experience • 4.9★ Rating • 179 Freelancer Reviews • Certified Developers Vasundhara Solutions Lab LLP 🚀 builds AI-powered applications, mobile apps, SaaS platforms, full-stack web applications, APIs, and scalable custom software. Our expertise includes AI Development, Generative AI, LLMs, RAG, AI Agents, AI Chatbots, AI Assistants, Vector Search, OCR, Computer Vision, and AI workflow automation. For Mobile App Development, we work with Flutter, React Native, Android, Kotlin, iOS, Swift, SwiftUI, Firebase, APIs, payments, subscriptions, GPS, chat, live streaming, and audio/video calling. For Full Stack & SaaS Development, we work with React.js, Next.js, TypeScript, Node.js, Python, Django, PHP, Laravel, PostgreSQL, MongoDB, MySQL, Firebase, Supabase, Redis, REST APIs, and cloud infrastructure. We can help with: ✅ AI Applications & AI Integration ✅ AI Agents, LLM & RAG Solutions ✅ Flutter & React Native Apps ✅ Native Android & iOS Development ✅ Full Stack Web Development ✅ SaaS Platforms & MVP Development ✅ React.js & Next.js Applications ✅ Node.js & Python Backend Development ✅ REST APIs & Third-Party Integrations ✅ Marketplace, CRM & Booking Platforms ✅ E-commerce & Subscription Applications ✅ Admin Panels & Business Dashboards ✅ Existing App Upgrades & Maintenance ✅ UI/UX, QA, Deployment & Scaling Why work with us? 1️⃣ 13+ years of software development experience 2️⃣ 177 Freelancer reviews with a 4.9★ rating 3️⃣ Certified Android & iPhone Development expertise 4️⃣ Dedicated AI, Mobile, Web, Backend, UI/UX & QA teams 5️⃣ Experience from MVP development to scalable production platforms 6️⃣ Long-term maintenance, optimization and scaling support 🕹️Our game development studio was featured in Google’s #WeArePlay program in 2023. 🏢 Industries: AI | SaaS | Healthcare | Education | Fitness | Marketplace | Booking | CRM | E-commerce | Social Networking | Streaming | Automation Have an AI, Mobile App, Full Stack, SaaS or MVP project? Share your requirements and let’s discuss the right technology and development approach 🎯 less -
Hire AdeelAslam4
We're BrainX, a Pakistan-based software team that builds and maintains mobile apps people actually use. Baritastic, a HIPAA-compliant bariatric care app we've maintained for over 5 years, has 500,000+ installs and a 4.6 rating on Google Play, with native iOS and Android builds, wearable integrations across Fitbit,...We're BrainX, a Pakistan-based software team that builds and maintains mobile apps people actually use. Baritastic, a HIPAA-compliant bariatric care app we've maintained for over 5 years, has 500,000+ installs and a 4.6 rating on Google Play, with native iOS and Android builds, wearable integrations across Fitbit, Garmin, and Apple HealthKit, and a provider dashboard for care teams. That's not the only one live today: • Ponder, an AI voice-therapy app on both app stores • CaloTracker, an AI-powered calorie and nutrition tracker built in Flutter, with photo and barcode scanning and Apple Health sync • LUMP, a cross-platform Flutter social meetup app with a Node.js and MongoDB backend, live on both stores • RollStrong, a Flutter fitness app with a working subscription model, live on both stores • SwapDotz, an app using native NFC integration to verify and trade physical collectibles Clients back this with real budgets: one mobile app project came in at over $17,000, another at over $4,000, both five-star reviews specifically praising our delivery and communication. AI development is core to what we build into mobile • MathAMentor, an AI maths tutor students talk to through a live avatar • Call Sling, an AI agent that answers and routes inbound calls • DocuMed, AI medical transcription with mobile, web, and offline support • RAG assistants, document and workflow automation, and support bots running across websites and WhatsApp for live clients Also part of what we do: Web Development • Next.js, React, Node.js, Python, and Laravel Shopify & Custom eCommerce • Custom storefronts and eCommerce builds UX/UI Design • Full product design from concept through interface Tell us what you're building and we'll walk you through how we'd approach your mobile app. less -
Hire cmitexperts
CMITEXPERTS is a web and software development team helping businesses build, improve, and maintain their websites, eCommerce stores, and custom applications. We work with both new and existing projects — whether you need a small fix, a highly customized website, a new feature, an eCommerce solution, a third-party...CMITEXPERTS is a web and software development team helping businesses build, improve, and maintain their websites, eCommerce stores, and custom applications. We work with both new and existing projects — whether you need a small fix, a highly customized website, a new feature, an eCommerce solution, a third-party integration, or a complete business application built from the ground up. Our main areas of expertise include: WORDPRESS & WOOCOMMERCE • Custom WordPress website development • Highly customized themes and functionality • Elementor development and customization • Custom plugins and integrations • WooCommerce customization • Complex product, pricing and checkout requirements • Performance, security and maintenance • Figma to WordPress development WordPress is one of our strongest areas, especially when a project requires more customization than a standard theme or plugin can provide. SHOPIFY • Custom Shopify theme development • Shopify 2.0 customization • Custom Shopify apps and private apps • Shopify API and webhook integrations • Custom eCommerce functionality • Product, pricing and checkout customizations • Store improvements and performance optimization CUSTOM WEB APPLICATIONS When a project needs something beyond WordPress or Shopify, we build custom applications using modern technologies such as: • React / Next.js • Node.js / NestJS • Laravel / PHP • PostgreSQL / MySQL • REST APIs and third-party integrations • AWS • Git and CI/CD This includes admin panels, dashboards, booking systems, business management platforms, SaaS applications, customer portals, internal tools, and other custom software. DEVOPS & DEPLOYMENT We can also take care of the technical side of getting an application into production — including AWS setup, servers, deployment, Git workflows, CI/CD pipelines, environment configuration, backups, and ongoing maintenance. UI/UX & MOBILE We work with Figma to create and implement clean, responsive interfaces and can also develop mobile applications based on your product requirements. SEO & PERFORMANCE We also help improve website performance and technical SEO, including speed optimization, Core Web Vitals, technical issues, and search-engine-friendly implementation. ⭐ 500+ Five-Star Reviews 🚀 2,000+ Projects Delivered 🌍 Working with businesses worldwide What matters to us is understanding what you actually need before jumping into development. For some projects, WordPress or Shopify is the right solution. For others, a custom application makes more sense. We choose the approach based on the requirements rather than forcing every project into the same technology. Whether you need a quick fix, an existing website or application improved, or a complete system developed from scratch, we're happy to take a look. Send us the requirements, even if they're not fully defined yet. We'll review them and suggest a practical way forward. less
