Nauman A.

Your SaaS needs more than someone who writes code. You need a Senior Full-Stack Developer who can build, take over, and scale production applications, integrate AI features, and own delivery from architecture to deployment. I'm a Top Rated Plus Senior Full-Stack Developer with $100K+ earned on Upwork and experience across SaaS products, AI-powered applications, marketplaces, healthcare platforms, and business automation. I work with founders and product teams who need a reliable engineering partner to turn ideas into working products, improve existing applications, or add AI capabilities without making their systems unnecessarily complex. WHAT I CAN HELP YOU BUILD Full-Stack SaaS Development - SaaS MVP development from initial architecture to production launch - React, Next.js, TypeScript, Node.js, Python, and Ruby on Rails - PostgreSQL, Supabase, REST APIs, and third-party integrations - Multi-tenant applications, dashboards, authentication, and role-based access - Stripe subscriptions, usage-based billing, and payment integrations AI Agents & LLM Integration - AI agents that use tools, APIs, and business data to complete tasks - LLM integrations using OpenAI and Claude APIs - RAG and knowledge-retrieval workflows - AI-powered assistants, lead qualification, and customer support automation - Human approval steps, structured outputs, error handling, and workflow reliability Existing Product Takeover & Improvement - Taking over Replit, Lovable, and existing SaaS codebases - Debugging, refactoring, and improving application stability - Adding features without disrupting existing functionality - API and webhook integrations - Production releases, maintenance, and technical documentation Business Process Automation - n8n, Make, and Zapier workflows - CRM integrations with GoHighLevel and HubSpot - Automated lead routing, follow-ups, email workflows, and data synchronization - Connecting AI services with existing business systems RELEVANT PROJECT EXPERIENCE Leadership Assessment Platform Built a multi-part assessment platform on Replit and continued supporting its maintenance and feature development. My work history includes 1,027 hours on this platform, with 5-star client feedback on completed engagements. Zarlo | SaaS & AI Features Worked as a Senior Full-Stack Engineer on a multi-tenant commerce platform, including payment integrations, subscriptions, APIs, and AI-powered product features. iRevise | EdTech SaaS Worked on an education technology platform using Ruby on Rails, React, and Stripe, with subscription and conversion-focused product functionality. Cardex Market | Marketplace SaaS Worked on marketplace functionality involving external pricing integrations, subscriptions, and real-time features. MY TECH STACK Frontend: React, Next.js, TypeScript, JavaScript, Tailwind CSS Backend: Node.js, Python, FastAPI, Ruby on Rails Databases: PostgreSQL, Supabase, MongoDB, Redis AI & Automation: OpenAI API, Claude API, RAG workflows, AI agents, n8n, Make, Zapier Integrations: REST APIs, webhooks, Stripe, CRM and third-party services Deployment: AWS, Vercel, Docker, GitHub Actions HOW I WORK I take ownership beyond individual tickets. I communicate clearly, flag risks early, document important decisions, and focus on delivering software that remains maintainable after launch. Whether you need a SaaS product built from scratch, an existing application stabilized, or AI integrated into an established workflow, I can help you work through the technical decisions and deliver the implementation. I'm available for long-term engagements and ongoing product development. Send me a brief description of your product, current codebase, or automation challenge, and let's discuss the most practical way forward.