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Hi. I am a senior full-stack developer with 5+ years of experience creating modern, responsive, and scalable apps in startup and small teams across the world building products ground up . I'm an expert in JavaScript, NodeJS, Angular, React,MongoDb, Express,GraphQL, Ionic, Bootstrap. I am a self-driven and detail-oriented developer, focusing on quality and exceeding expectations of both internal and external clients, along with excellent communication skills and a passion for test-driven development. - I believe in Test Driven Development (TDD) and have written unit tests both for client and server code. ✅client :- -E2e,unit and integration tests with Protractor ,Jasmine and cypress ✅ server :- -E2e,unit and integration tests with Mocha and Chai Below are my strengths and skills - ✅ Front End Development- ✔ Core Expertise - Angular (v2+),React,Vue,NextJs, Typescript, Javascript, ES5/6, HTML5, CSS3/4, SASS, LESS and jQuery etc. ✔ GraphQL, Restful (JSON) and SOAP (XML) API integration ✔Ionic 3,4,5 ✅ Back-end (API) development - ✔ Core Expertise - NodeJS, ExpressJS and GraphQL. ✔Micro services with RabbitMQ message Brokes ✔ oAuth 2.0, JWT and PassportJS implementation ✔ Other experience - NestJS and SocketIO ✅ Databases – ✔ Core Expertise - MongoDB, MySQL, Firebase cloud and realtime databases ✔ Other experience - Postgres,SQLite etc. ✅ Others : - Tailwind CSS, Material-UI, Bootstrap, Vuetify ✅ Full-stack development frameworks - MEAN, MERN ✅ Payment processor integrations – Authorize.net, Stripe and PayPal. ☑ Development & management tools – Github, Gitlab, Bitbucket, SVN, TFS, JIRA, Asana, Trello, Crashlytics, GenyMotion, Hockey app, ngrok, Hipe, and Sencha Animator Looking forward to working with you Thank you for reading my profile. warm regards, Evans C.

Hi, I'm Martin, a full-stack developer building fast, reliable web and mobile apps that are ready for real users, not just demos. WHAT I BUILD - Web apps: marketing sites, dashboards, SaaS products, internal tools - Mobile apps: cross-platform iOS and Android (React Native / Flutter) - APIs and backends: REST, auth, payments, integrations - Fixes, refactors, and feature work on existing codebases STACK - Frontend: React, Next.js, TypeScript, Tailwind - Mobile: React Native, Flutter - Backend: Node.js, Express, Python, PostgreSQL, MongoDB, Firebase - Cloud: Vercel, AWS, Azure, Supabase - Extras: Stripe, OpenAI/LLM integrations, CI/CD, Git HOW I WORK 1. Quick call or written brief to scope the work 2. Clear timeline and fixed milestones (no scope creep surprises) 3. Daily or weekly updates, demo links as we go 4. Clean, documented code you actually own WHY CLIENTS HIRE ME - I write code I would want to maintain - I communicate in plain English, not jargon - I hit deadlines or tell you early if something will slip - I care about the end user, not just the ticket Available for fixed-price projects, hourly work, and ongoing retainers. Message me with your idea or a link to your current site/app and I'll reply with honest scope, timeline, and price.

🏆100% job success score. 🏆TOP RATED PLUS ( 3% of talent on Upwork) specializing in Mobile Applications Development targeting iOS and Android platforms using Native and Hybrid (React Native, Cordova & Flutter) approach.

Most apps are built to launch. Few are built to last — and almost none are built for the AI era. I build React Native apps that are fast, scalable, and ready to integrate AI features your users will actually notice — including LLM-powered experiences using OpenAI and Claude by Anthropic. From MVP to full product, clean code, no shortcuts, no expensive rewrites later. My stack covers the full picture: React Native and Expo on the frontend, Node.js, Express and NestJS on the backend, Firebase, MongoDB and PostgreSQL for data, and OpenAI, Claude and Lovable for AI integration — all tied together with proper CI/CD pipelines. What you actually get: An AI-ready architecture that won't need rebuilding when your product grows. Performance-first builds that feel fast to the people using them. Clean, maintainable code your next developer won't curse you for. And a developer who stays until it's right — not until it's shipped. Let's build something that's still standing two years from now.

I help startups and growing companies determine whether AI can actually solve their business problems and then build working solutions to prove it. Whether you are asking "Can AI automate this workflow?" or "Should we build a chatbot for our knowledge base?", I will give you clear, honest answers backed by working proof, not just speculation. WHAT I BRING I spent 15+ years building and shipping software products, including 3 years as a Senior Product Manager at Microsoft, where I built developer tools used by thousands of developers. I have led distributed technical teams, designed APIs, and turned ambiguous requirements into products that ship. Now, I'm focused on AI; building RAG pipelines, developing AI agents, and helping teams cut through the hype to understand what's actually achievable today. WHAT I'VE BUILT RECENTLY * RAG pipeline using Llamaindex, FastAPI, PostgreSQL, and React for retrieval over document collections. * Published AI agent tutorials walking through architecture, tool use, and implementation. * Currently building an Agentic RAG pipeline builder. WHAT I CAN HELP WITH * AI Feasibility Assessments: Before you invest, let us determine if AI fits your use case and what building it would require. * RAG Pipeline Development: Connect your documents, knowledge base, or data to LLMs for Q&A, search or analysis. * AI Agents: Agents that automate workflows, assist users, or integrate with your tools. * AI Product Strategy: Roadmapping, prioritization, and practical planning for AI-powered features. MY APPROACH I ask questions before I build. Too many teams invest in AI solutions before understanding whether AI is even the right tool. My background in product management means I think about product outcomes first, then work backward to the technical approach. If you are exploring AI for your business and want practical guidance from someone who has shipped real products, send me a message. Happy to chat about your project.

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.