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Hi, I’m David Topoika, a skilled full-stack mobile and web developer with 4+ years of experience building robust, scalable, and user-friendly applications. I specialise in developing cross-platform mobile apps with Flutter and building secure backend services and responsive web applications. Whether you're launching a startup, growing an e-commerce business, or building an internal system, I can help you design, develop, and deploy complete software solutions from mobile frontends to backend APIs and admin dashboards. I’ve worked both full-time and freelance as a mobile developer across: ✔️ Fintech – Invest Africa, Vesen Computing ✔️ E-commerce – AutoCllan, GoEat My goal is to deliver mobile and web apps that go beyond functionality, helping you reduce costs, improve user experience, and boost conversions. I combine strong technical skills with a business-focused mindset and clear, timely communication. ✅ What I Can Help You With: ✔️ End-to-end mobile app development (iOS & Android) using Flutter ✔️ Full-stack web applications with React, Next.js, and Tailwind CSS ✔️ Backend API development with Node.js, Express, and TypeScript ✔️ Deploy your app to Firebase or AWS with real-time database support. ✔️ RESTful API integration for third-party services (M-Pesa, Stripe, PayPal, YouTube) ✔️ Admin dashboards, analytics panels, and payment integrations (M-Pesa, Stripe, PayPal) ✔️ Bug fixing, app upgrades, and performance optimisation ✔️ Customising and extending existing Flutter templates or web themes 🌟 Why Clients Choose Me: ✔️ Proven track record with 10+ completed projects and 5-star client reviews ✔️ Strong communication, fast turnaround, and clean, maintainable code ✔️ Committed to understanding your goals and delivering real results ✔️ Experienced in working with remote teams and Agile/Scrum methodologies ✔️ Collaborative and proactive, I’ll suggest improvements, not just follow instructions 🔍 Technical Skills & Tools: ✔️ Languages & Frameworks: Dart, Flutter, JavaScript, TypeScript, Node.js, Express.js, Next.js ✔️ Mobile & Web: Flutter, Firebase, Tailwind CSS, REST APIs ✔️ Databases & Hosting: Firebase, Firestore, MongoDB, MySQL, AWS, Vercel ✔️ Tools: Git, GitHub, Postman, Trello, Figma, VS Code Let’s build your next app clean, fast, and exactly how you want it. Message me today and let’s turn your idea into a real, functional product that your users will love.

I’m a Senior Full-Stack Engineer with extensive experience building reliable, scalable web applications from the ground up. I help clients turn complex ideas into production-ready systems that are fast, maintainable, and built to last. I specialize in working across the stack — from well-designed backend APIs and data models to clean, responsive front-end interfaces — with a strong emphasis on code quality, performance, and real-world reliability. What I bring to your project: 1. Backend expertise: Node.js, TypeScript, REST APIs, background jobs, data synchronization, third-party integrations 2. Frontend expertise: modern JavaScript frameworks, clean UI architecture, responsive and user-friendly interfaces 3. System design: scalable architectures, clear API contracts, and maintainable codebases 4. Problem-solving: breaking down ambiguous requirements, handling edge cases, and delivering practical solutions 5. Ownership: I take responsibility for features end-to-end, not just isolated tasks I’m particularly strong at projects that require: - Integrating multiple services or APIs - Handling complex business logic or data flows - Improving or stabilizing existing systems - Building MVPs that are ready to scale Clients appreciate working with me because I communicate clearly, think ahead, and deliver dependable results without constant hand-holding. If you need a senior engineer who can quickly understand your product, make solid technical decisions, and execute with precision — I’d be glad to help.

I’m a Senior Software Engineer with 6+ years of experience building high-quality web and mobile applications using React.js and React Native. I specialize in developing cross-platform solutions that are fast, reliable, and deliver a seamless user experience across devices. Currently, I work as a Senior Mobile Engineer at Gessic Softwares, where I design and build scalable mobile applications while applying modern development practices and performance optimization techniques. My approach to development is client-focused: I work closely with stakeholders to understand their business needs and translate them into practical, well-engineered solutions. If you're looking for a developer who can deliver clean, maintainable code and high-performing applications, I’d be glad to collaborate and help bring your product to life.

Hi! I'm a full-stack developer with 5+ years of experience in building 🌟 visually stunning and ⚡ high-performance websites. My skills include: 💻 Frontend & Frameworks • React.js • Next.js • Gatsby.js • Alpine.js • Redux • Tanstack Query 🎯 Backend & API • Node.js • GraphQL • Nest.js 🎨 Styling • Tailwind CSS • Semantic UI • HTML • CSS • HTMX • Material UI I combine technical expertise with a passion for creating user-friendly, engaging digital experiences. Whether you need a website revamp or a new build, I’m here to help bring your vision to life with a smooth, collaborative process. Let's elevate your online presence! 🚀

I am a Full Stack Engineer and Data Extraction Specialist. I help businesses build scalable SaaS platforms and the automated data pipelines that power them. My approach is simple: I build the software you need, and the data that drives it. Whether that's a complex SaaS MVP with secure payments or a cloud-based scraper running on Apify, I deliver clean, robust, production-ready code. MY CORE SERVICES: Full Stack & SaaS Architecture SaaS MVPs: End-to-end development including secure authentication (Auth0/NextAuth), Stripe payments, and role-based user management. API Development: Fast RESTful and GraphQL APIs using Node.js (Express/NestJS) or Python (FastAPI). Database Design: Optimized PostgreSQL or MongoDB schemas built to handle large datasets. Advanced Web Scraping & Data Extraction Scalable Cloud Scraping: Custom Apify Actors that extract thousands of records without getting blocked. Dynamic Content: Playwright and Crawlee for complex single-page applications standard tools can't touch. Anti-Bot Evasion: Proxy rotation and fingerprint management to bypass Cloudflare and CAPTCHAs. Frontend Engineering Modern UI: Responsive, mobile-first frontends in React, Next.js, and Tailwind CSS. Performance: Server-side rendering for fast load times and strong Core Web Vitals. Data Visualization: Turning raw data into interactive dashboards with Recharts and D3.js. MY TECH STACK: Frontend: React.js, Next.js, TypeScript, Tailwind CSS, ShadCN UI. Backend: Node.js, Express, NestJS, Python (FastAPI). Scraping & Automation: Apify, Crawlee, Playwright, Puppeteer, Make, n8n. Databases: PostgreSQL, MongoDB, Supabase, Redis. DevOps: AWS (EC2/S3), Docker, Vercel, Netlify, Render, Railway. WHY WORK WITH ME? Strict Standards: I write strict TypeScript and clean, documented code to prevent bugs. Clear Communication: I treat every project like a partnership, with daily updates and clear roadmaps. I'm Top Rated on Upwork and ready to start building. Let's chat.

I help startups and businesses build scalable web applications, SaaS platforms, AI-powered products, and cloud infrastructure using JavaScript, TypeScript, Python, Go, and modern cloud technologies. Whether you need an MVP, a production-ready SaaS platform, API integrations, AI automation, or DevOps infrastructure, I can take ownership of the entire development lifecycle—from architecture and development to deployment and scaling. 💡 What I Can Help You Build ✅ SaaS Platforms Multi-tenant SaaS applications Subscription and billing systems Admin dashboards Role-based access control Customer portals ✅ Full Stack Web Applications React.js & Next.js applications Node.js & NestJS backends Python (FastAPI & Django) systems REST APIs & GraphQL APIs Real-time applications ✅ AI-Powered Applications OpenAI integrations AI chatbots and support systems Retrieval-Augmented Generation (RAG) Vector databases and embeddings Workflow automation and AI agents ✅ Cloud & DevOps AWS infrastructure Docker containerization CI/CD pipelines Kubernetes deployments Monitoring and performance optimization Infrastructure automation ✅ API Development & Integrations Payment gateways (Stripe, PayPal) Third-party API integrations Authentication systems Data synchronization services 🛠 Core Technologies Frontend: React.js, Next.js, TypeScript, JavaScript, Tailwind CSS Backend: Node.js, NestJS, Express.js, Python, FastAPI, Django, Go Databases: PostgreSQL, MySQL, MongoDB, Redis Cloud & DevOps: AWS, Docker, Kubernetes, CI/CD, GitHub Actions, Nginx AI: OpenAI, LangChain, Vector Databases, RAG Systems Why Clients Work With Me ✔ End-to-end ownership from frontend to infrastructure ✔ Clean, scalable, maintainable code ✔ Fast MVP delivery ✔ Clear and proactive communication ✔ Production-ready deployments ✔ Long-term support and maintenance If you're looking for a Full Stack Developer experienced in JavaScript, TypeScript, Python, Go, React, Node.js, AI integrations, and DevOps, let's discuss how I can help bring your project to production. Tags Full-Stack Developer (React / Node.js) | React / Next.js / Nest.js Developer | Node.js Backend Developer | MERN Stack Developer | Full Stack Laravel Developer | Supabase Full Stack Developer | Full Stack JavaScript Developer | Full Stack SPA Developer | Full Stack Real-Time Web Applications Developer | Full Stack Dashboard Development Expert | Full Stack Custom SaaS & MVP Developer | Full Stack DevOps Engineer | Full Stack Database Management Expert | Responsive Web Design Specialist | Enterprise SaaS, Admin Dashboards, Role-Based Analytics, Reporting, Internal Workflow Automation | Senior Software Developer | SaaS Developer | Nest.js Framework Expert | Node.js Web Development | React Lifecycle Expert | Full Stack Development Specialist,Nuxt.js,Vue.js,Nuxt.js,Vue.js,Nuxt.js,Vue.js,Nuxt.js,Vue.js React.js, React Native, Next.js, Node.js, Nest.js, JavaScript, TypeScript, Python, Django, Laravel, Supabase, PostgreSQL, MySQL, Firebase, Expo, Flutter, iOS, Android, RESTful API, API Integration, Payment Gateway Integration (Stripe), User Authentication, Cross-Platform App Development, Progressive Web Apps (PWA), AI Development, AI Agent Development, Website Redesign, Mobile App Development, Custom SaaS Development, Full Stack DevOps,Nuxt.js,Vue.js #WebDevelopment #FullStackDevelopment #WebApplication #JavaScript #NodeJS #ReactJS #Python #Django #APIIntegration #RESTfulAPI #AIDevelopment #PostgreSQL #SaaSDevelopment #UserAuthentication #DatabaseArchitecture #PaymentGatewayIntegration #MobileAppDevelopment #iOS #Android #Flutter #CrossPlatform #ReactNative #Firebase #Expo #TypeScript #ProgressiveWebApp #CustomSaaS #DevOps