Arun Singh G.Private profile: Upwork shows its earnings only to signed-in members, so we check it every few weeks, not daily. MRR here is a rough estimate (Upwork's six-month earnings ÷ months active). Last read Nov 5, 2026.

🏆 Top Rated Plus | ✅ Top 2% on Upwork | ⏳ 100% Job Success I'm an AI-native developer. I build AI-powered SaaS apps, add AI agents and LLM features to products, and rescue apps that got stuck halfway. 10+ years, real products, real paying users. I work with React and Next.js, Supabase or FastAPI, Stripe billing, and AI integration that holds up outside a demo. Based in India, working with founders in the US, UK, Europe, Australia and the Gulf. WHAT I DO - AI app development: SaaS MVPs, web and mobile - AI integration: OpenAI and Claude API inside your product - AI agents and agentic workflows that do real tasks, not just chat - LLM features: smart search, summaries, scoring, assistants - RAG chatbots that answer from your own documents - Audit and fix apps built with Lovable, Replit, Bolt, Cursor or v0 - Take over code when your last developer left - Stripe subscriptions, automations, getting apps safe for real users GOT A VIBE-CODED APP THAT'S HALF WORKING? Get a straight answer before you spend more money. I check: - Can one customer see another customer's data? - Is login and payment safe for real users? - Are secret keys sitting where anyone can find them? - What breaks first when 10x more people show up? - Is it worth fixing, or cheaper to rebuild the risky parts? You get a plain-English report, every problem ranked (fix now, fix soon, can wait), and a fixed price and timeline to sort each one. Proof I've done this kind of audit: CareOne365: reviewed a 104,000-line home care platform before its first paying agency went live. Checked customer data separation, billing, payroll and offline sync. The founder used the report to decide how to launch. Subsource GPS: field-tracking app was missing store visits and losing data offline. We rebuilt the tracking, added crash monitoring and tests, and fixes now ship in minutes. STACK React, Next.js, TypeScript, Tailwind, Supabase, PostgreSQL, FastAPI, Node.js, OpenAI API, Claude API, Stripe, AWS, Vercel, Docker, GitHub Actions. I use Claude Code and Cursor daily, with every change reviewed and tested. QUICK ANSWERS - Can you fix an app built with Lovable, Replit or Bolt? Yes. I audit it first, tell you what's safe and what's not, then fix what matters. - Do you build AI agents? Yes, inside SaaS products and as standalone automations. - Can you add AI to my existing app? Yes. I connect OpenAI or Claude to your product and keep the AI cost under control. - Do you build RAG chatbots? Yes, chatbots that answer from your own files and data. - Can you take over from another developer? Yes. I start with a code review so you know what you're inheriting. - How long does an audit take? Usually a few days, depending on app size. HOW I WORK I'll tell you if a feature isn't worth building. I flag risks before they cost you money, and I give realistic timelines, not the ones you want to hear. You'll always know where things stand. Message me with your app link or idea and your timeline. I'll reply with honest next steps. Full Stack Developer | Full Stack Engineer | React Developer | React.js Developer | Next.js Developer | NextJS Developer | Node.js Developer | NodeJS Developer | TypeScript Developer | JavaScript Developer | Frontend Developer | Backend Developer | MERN Stack Developer | Python Developer | Django Developer | SaaS Development | SaaS Application Development | Product Engineer | Software Engineer | Technical Lead | Web Application Developer | Web App Developer | Custom Software Development | MVP Development | Next.js Development | Node.js Development | Python Development | API Development | API Integration | REST API | GraphQL API | Microservices | Monolithic Architecture | Scalable Architecture | Multi-Tenant SaaS | Multi-Tenant Architecture | PostgreSQL | MongoDB | AI Integration | OpenAI AP I Claude API | LLM IntegrationGenerative AI | AI AgentsAgentic AI | AI AutomationAI SaaS | Custom AI Solutions