I will build a full stack app with ai and llm integration using fastapi and react


About this gig
Are you looking for a reliable full-stack developer who delivers clean, production-ready code on time? You're in the right place.
I specialize in building mobile apps with React Native, backend APIs with FastAPI and Node.js, and AI/LLM integrations using OpenAI and Gemini APIs. Every project I deliver is well-structured, documented, and built to scale.
What I can build for you:
- Cross-platform mobile apps with React Native and Expo
- REST APIs and backend systems with FastAPI or Node.js
- Full stack web apps with React.js and MongoDB or PostgreSQL
- AI and LLM integrations with OpenAI, Gemini, or Anthropic APIs
- Payment integrations with Stripe and Razorpay
- Docker containerization and deployment
Why work with me:
- I have built a healthcare FHIR R4 API converter used for medical data interoperability
- I have built a school ERP mobile app with 6 user roles and real payment integration
- I have built a doctor booking platform with dual payment gateway support
- Every project comes with clean GitHub handoff and documentation
My process:
- You share your requirements
- I confirm scope and timeline
- I build, test, and deliver
- You request revisions if needed
- Done
I respond within a few hours and keep you up
Get to know Sarthak Pundir
Full Stack Developer ,React Native FastAPI , AI Integrations
- FromIndia
- Member sinceJun 2026
Languages
Hindi, English
FAQ
What information do you need to start?
I need a clear description of your requirements, any existing code or design files, and your preferred tech stack. The more detail you provide, the faster I can deliver.
Do you provide the source code?
Yes, all source code is handed over via GitHub with proper documentation upon project completion.
Can you work with my existing project?
Absolutely. I can integrate new features, fix bugs, or improve existing codebases in React Native, Node.js, FastAPI, or MongoDB.
What if I need changes after delivery?
Each package includes revisions. Additional revisions beyond the package limit can be requested as a paid extra.
Do you have experience with payment integrations?
Yes, I have built and deployed real applications with both Stripe and Razorpay payment gateways.

