Hire the Best Backend Rest API Freelancers
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Full-Stack Web Developer | WordPress Expert | Next.js | MERN Stack | SEO & Speed Optimization | UI/UX Design | AWS | Figma | SSL setup | Website rebuild | Cybersecurity | API | API security | Hosting setup | Vercel | Github | Urgent | Web | Help | cPanel | deployment | Server setup | Apache | Nginx | PM2 | Tailwind CSS I am a Full-Stack Web Developer building modern, scalable web applications Fintech,SaaS, Startups,CMS,Admin Dashboards,School Analytics and high-performance WordPress sites that look great, load fast, and convert. With hands-on experience across the full stack — from pixel-perfect frontend design to robust backend architecture — I deliver clean, maintainable solutions on time Full-Stack Development I specialize in the MERN stack (MongoDB, Express.js, React, Node.js), Next.js, and AWS. I build end-to-end web apps for e-commerce, SaaS platforms, event management, and real-time systems — complete with payment gateways, authentication, and cloud storage. WordPress & CMS Custom WordPress builds using Elementor Pro, theme development, speed optimization (Core Web Vitals), on-page SEO, and migrations. I also work with Shopify, Wix, and Squarespace. Backend & Databases RESTful APIs and GraphQL services using Node.js and Express.js, with deep expertise in PostgreSQL, MySQL, and MongoDB. Testing & Quality Assurance Automated E2E testing with Playwright and Selenium, performance audits with Lighthouse, and API testing with Postman and Jest. UI/UX Design Responsive, accessible interfaces using React, TypeScript, and Tailwind CSS. Design work in Figma — including brand identity, logos, and marketing materials. TECH STACK Frontend: React, Next.js, TypeScript, Tailwind CSS, HTML5, CSS3, Bootstrap, JavaScript Backend: Node.js, Express.js, PHP, GraphQL, REST APIs Databases: PostgreSQL, MySQL, MongoDB CMS: WordPress, Shopify, Wix, Squarespace Cloud & DevOps: AWS, Vercel, Deployment pipelines Design Tools: Figma, Adobe XD, Illustrator, Photoshop, Framer Motion Testing: Playwright, Selenium, Jest, Postman, Lighthouse Hosting: Hostinger, Namecheap,vercel,Railway, WHY WORK WITH ME → Clean, documented code with an emphasis on performance and maintainability → Strong communication and on-time delivery → Experience across startups, agencies, and direct client work → Comfortable working solo or as part of a distributed team HOSTING PLATFORMS Cloud / VPS: AWS, GCP ,Azure , DigitalOcean , Vultr , Linode , Hetzner Shared / Managed: Bluehost , Hostinger , SiteGround ,GoDaddy , DreamHost ,A2 ,iPage WordPress: WP Engine , Kinsta ,Flywheel , Cloudways , Pressable Static / PaaS : Vercel , Netlify , Render ,Heroku , Fly io , Railway , OVHcloud , Cloudflare WEB SECURITY Web Security Best Practices API Security: HTTPS enforcement ·,JWT / OAuth 2.0 / API keys , Rate limiting & throttling , CORS policy configuration , Input validation & sanitization Cookies & Sessions: HttpOnly & Secure flags , SameSite attribute , Short session expiry , CSRF token protection , Signed & encrypted cookies HTTP Headers: Content Security Policy (CSP) , HSTS , X-Frame-Options , X-Content-Type-Options ,Referrer-Policy General Hardening: SQL injection prevention ,XSS mitigation , Dependency auditing, Environment variable secrets ,Least privilege access Payment integration and APIs Payment Gateways: Stripe, PayPal, Square, Braintree, Authorize.net, Adyen, Razorpay, Flutterwave, Paystack, M-Pesa, Pesapal Integration Techniques: REST API integration, Webhook handling, Tokenization, Redirect & embedded flows, Idempotency keys Security & Compliance: PCI-DSS, 3D Secure (3DS2), SSL/TLS, Fraud detection, Strong Customer Auth (SCA) Billing & Subscriptions: Recurring billing, Trial & promo periods, Refunds & chargebacks, Multi-currency support, Invoice generation MPesa - Daraja API, Africastalking Let's build something great — reach out and let's talk about your project. SEO philip kipkemoi korir freelancer, freelancers from kenya, freelancers from africa, global freelancer, reliable freelancer, web developer, exper web developer, freelance, upwork freelancer, affordable freelancer on upwork, urgent web developement service , web developer, invite freelancer, find, i need a freelancer, looking for a freelancer, ssl, cpanel, freelancer in kenya, kenya tech, african tech

Looking for more than just a developer · A partner who can architect, build, test, automate, optimize and deploy your entire system with confidence - I deliver. ✨ With 5+ years of hands-on experience across Angular, React, Node.js, .NET, SQL, NoSQL and certified QA/QE testing, I engineer solutions designed for perfect scale, speed, security, and long-term reliability. From microservices to real-time apps, AI integrations, payment systems, and containerized deployments — I handle every layer with precision and purpose. ⚙️🚀 If you want a developer who brings senior-level capability, engineering discipline, and clear communication, let’s build something exceptional together. ⭐ MY CORE SKILLS ⭐ ✅ Frontend Excellence – Angular, React, NEXT, TypeScript, JS, Tailwind, Bootstrap, Material UI ✅ Backend Engineering – Node, Bun , Express, Prisma, C#, EF Core, ASPNET, REST APIs ✅ Databases – SQL Server, MySQL, PostgreSQL, MongoDB, Firebase, Neon, Mongoose ✅ QA/QE Expertise – Jest, Cypress, Jasmine, xUnit, Moq (certified QA/QE Engineer) ✅ Architecture – Microservices, API Gateways, modular backend systems ✅ Deployment – Docker, Azure, Render, Netlify, Vercel, CI/CD pipelines ✅ Real-Time Apps – WebSockets, SignalR, Socket IO ✅ AI Integrations – Chatbots, image processing, content generation, OpenAI API ✅ Payments – PayPal, Stripe, MPesa Daraja API ✅ Optimization – SEO-ready, fast-loading, scalable applications ✅ Microservices - RabbitMq, Winston, Morgan, NGINX ✅ Software Flexibility - ERPs, CRMs, Saas & MVP web applications ⭐ WHAT I DELIVER ⭐ 🚀 Clean, production-ready code 🛠️ Fully tested features (QA/QE included) ⚡ Fast performance and scalable architecture 🔐 Secure authentication & best practices 🧩 API integrations that work seamlessly 📦 Smooth deployment 🤝 Clear communication and reliability ⭐ IDEAL FOR ⭐ 📌 Startups needing a full product built 📌 Businesses looking for scalable systems 📌 Founders needing MVPs or Microservices 📌 Developers needing an extension to their team 📌 Anyone who wants a fast, clean, modern web application 📌Converting Figma to pixel-perfect, responsive code 📌Bug fixing & small feature additions ⭐ WHY CLIENTS ENJOY WORKING WITH ME ⭐ 🎯 I build with clarity & architecture in mind 🎯 I test what I build — quality guaranteed 🎯 I document everything for your future teams 🎯 I integrate AI the right way (no gimmicks) 🎯 I respect timelines & communicate openly My goal isn’t just to write code — it’s to help you build software that lasts, grows with your business, and feels effortless to maintain. Let’s build something powerful together. 🚀✨

Backend & API Developer specializing in C#/.NET, integrations, automation systems, and scalable business applications. I help businesses build, extend, fix, and stabilize backend systems that are critical to daily operations including SaaS platforms, CRMs, enterprise tools, workflow systems, desktop applications, and API-driven platforms. A large part of my work involves joining existing systems, understanding complex workflows quickly, and implementing solutions without breaking current operations. Core areas I work on: • REST API development & third-party integrations • OAuth, JWT, API authentication & secure system communication • Payment gateway, CRM, ERP, Shopify, and external service integrations • Workflow automation & background job processing • SQL Server, MySQL & PostgreSQL database design and optimization • Backend architecture and business logic implementation • System synchronization, offline/online sync flows & webhook handling • Performance optimization, debugging & legacy system stabilization • Desktop and web application backend development Technologies I work with regularly: • C# • ASP.NET Core / .NET Framework • Entity Framework Core • SQL Server / MySQL / PostgreSQL • Python • JavaScript • REST APIs • Laravel integrations • Queue systems & background processing I’m comfortable working on: • existing production systems • partially completed projects • unstable integrations • legacy applications • complex operational workflows • multi-module business platforms Recent work includes: • Migrating SOAP integrations to REST/OAuth architectures • Fixing broken third-party API integrations • Building and optimizing backend workflows • CRM and operational platform integrations • Authentication and secure API communication systems • Business process automation tools • Backend systems for finance and operational management • Performance optimization for API-heavy systems What clients value most when working with me: • fast understanding of technical problems • reliable communication • maintainable implementations • clean and structured backend logic • safe integration into existing systems • practical solutions focused on business outcomes If you need a developer who can understand the system, identify the actual problem, and implement a reliable solution without unnecessary complexity, I’m ready to help.

I’m David Jonathan, a Top Rated freelancer, web developer, YouTube scriptwriter, and development team lead helping startups, creators, small businesses, and growing companies build digital products and high-quality content. I lead a small, focused development team specializing in web applications, mobile apps, custom software, APIs, automation, and AI-powered solutions. I manage client communication, project planning, frontend development, quality control, and delivery, while my team supports projects requiring deeper backend, mobile, and systems development. Web & Frontend Development I personally build responsive, modern websites and user interfaces using: HTML5 CSS3 JavaScript Tailwind CSS Responsive Web Design UI implementation from Figma and other designs My focus is on clean layouts, fast-loading pages, mobile responsiveness, usability, and maintainable code. For larger applications requiring more advanced frontend architecture, my team works with: React.js Next.js TypeScript Interactive dashboards Component-based applications Backend & Full-Stack Development Our backend development stack includes: Python Django Node.js C# ASP.NET / .NET PHP REST APIs We can handle everything from a simple backend API to complete business platforms. Our database experience includes: PostgreSQL MySQL MongoDB Firebase We also integrate third-party APIs, payment systems, authentication services, external platforms, and business tools. Custom Software & SaaS Development We build custom solutions such as: SaaS platforms Admin dashboards Customer portals Internal business tools CRM systems Booking systems Data-driven applications Automation platforms API integrations Business management systems We can take a project from idea and technical planning through development, testing, deployment, and documentation. Mobile App Development Our team develops cross-platform mobile applications using Flutter. We can build apps with: User authentication REST API integration Firebase Real-time data Push notifications User profiles Admin dashboards Payment integrations Cloud databases AI Integration & Automation We also help companies integrate artificial intelligence into existing or new products. Our AI development services include: OpenAI API integration Anthropic API integration AI chatbots AI assistants Document-processing tools AI-powered content systems Workflow automation Business process automation AI features for SaaS platforms AI-powered web applications If you have an existing website or application and want to introduce AI functionality, we can help you plan and implement it without rebuilding your entire product. YouTube Scriptwriting & Content Alongside software development, I have extensive experience in professional YouTube scriptwriting and digital content creation. I write engaging, research-driven scripts for: YouTube documentaries Faceless YouTube channels YouTube automation channels Business and finance videos Technology videos Sports content Entertainment and pop culture Documentary storytelling Educational content Long-form explainer videos My scripts focus on strong hooks, storytelling, viewer retention, natural transitions, accurate research, and voice-over-friendly writing. My background in professional writing is also a major advantage when managing software projects. I can take a client's business idea, understand what they are trying to achieve, and translate it into clear technical requirements that developers can actually build. Why Clients Work With Me One of my strongest advantages is communication. You won’t have to constantly chase me for updates or struggle to explain your idea in technical language. I provide: Clear project communication Realistic timelines Regular progress updates Well-defined milestones Technical planning Clean and maintainable code Documentation Testing before delivery Post-delivery support when required I act as the bridge between your business idea and the technical team building it. Whether you need a: Responsive website Next.js or React application ASP.NET application Python/Django system Flutter mobile app Custom API SaaS platform Business dashboard AI integration Automation system YouTube script Long-form content project I’d be happy to discuss your requirements. Send me a message with what you’re trying to build or create, and I’ll give you a clear assessment of the project and the best way to approach it.

Software developer, 4 years experience. I build APIs, backend systems, and platform infrastructure for startups. Most of my work involves Node.js, TypeScript, Python and Django when the project calls for it. I'm comfortable with AWS, Docker, REST APIs, authentication systems, payment integrations (Stripe), real-time features with WebSockets, database design with PostgreSQL and MongoDB. I've also set up CI/CD pipelines, deployed to AWS, and monitoring using Prometheus and ELK Stack. Can do frontend as well (React/Next.js/Svelte). Recent work includes a chat system with message editing and replies, API maintenance handling thousands of daily requests, and backend systems for a social platform. Clean, documented code. Available for both short contracts and longer engagements. I work EU and US timezone hours from Nairobi. Clear communication, no disappearing. If something's blocked, I'll tell you. Happy to chat about your project.

Unreliable systems, slow APIs, and brittle integrations quietly kill products. I've seen it firsthand, and I build the kind of backend infrastructure that doesn't let that happen. Over the past 3+ years I've worked on fintech platforms, POS systems for pharmaceutical companies, and cloud-native applications that real people depend on daily. The problems I solve aren't always glamorous duplicate transactions, race conditions, failing queues, APIs that break under load but getting them right is what separates a product that works from one that doesn't. That's the work I genuinely enjoy. What I'm good at: → Payment integrations (M-Pesa Daraja, banking APIs) built to be reliable — idempotent, resilient, and hard to break. I redesigned one platform's payment pipeline from scratch and took their transaction success rate from 60% to 95%. → Microservices with Spring Boot API gateways, role-based access, async messaging with RabbitMQ → Full-stack builds with Next.js/React on the front, Spring Boot, Nest.js, or Flask on the back → Cloud infrastructure on AWS and GCP, containerized with Docker Tech stack: Java (Spring Boot), Python (Flask), TypeScript, Next.js, Nest.js, React, PostgreSQL, MongoDB, Redis, RabbitMQ, Docker, AWS, GCP I write tests, communicate proactively, and ship in small working increments no big-bang surprises at the end. I'm based in Nairobi (EAT/UTC+3) and I overlap well with US, EU, and UK hours. If you're building something and need a backend engineer who'll actually care about how it works, lets work together.