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$
USD
I will integrate openai, claude, or gemini API into your app
Vasu Sagar
About this gig
Want to add useful AI functionality to an existing product instead of installing a generic chatbot?
I integrate OpenAI, Claude, and Gemini APIs directly into web apps, mobile apps, SaaS products, and Node.js backends.
I can build:
- OpenAI / Claude / Gemini API integration
- AI chat and assistants
- RAG and knowledge-base search using your own data
- Structured AI outputs and workflows
- AI agents and tool/API calling
- AI features inside React or Next.js dashboards
- Database-aware AI functionality
- Existing AI feature fixes and improvements
I handle the application side as well as the AI layer: API integration, authentication, data flow, error handling, UI integration, and production-ready code.
You receive the source code and an explanation of how the integration works so you are not locked in.
Please message me before ordering with your current stack, desired AI behavior, data source, and provider preference.
Get to know Vasu Sagar
Vasu Sagar
Full Stack SaaS, React Native, AI Developer
- FromPakistan
- Member sinceFeb 2019
- Avg. response time1 hour
- Last delivery2 years
Languages
Sindhi, English, Urdu
Full-stack developer specializing in SaaS, web apps, React Native mobile apps, scalable Node.js backends, and production AI integrations. I work with React, Next.js, TypeScript, PostgreSQL, MongoDB, Firebase, OpenAI, Claude, and Gemini. From idea or Figma to frontend, backend, APIs, databases, AI features, testing, and deployment, I can build your product end to end. With 90+ Fiverr reviews and a 5.0 rating, I deliver clean, maintainable code, clear communication, and realistic timelines. Send me your requirements, idea, or existing code to get started.
My Portfolio
FAQ
Which AI models do you work with?
OpenAI (GPT models), Claude, and Gemini, via their official APIs.
Do I need my own API key?
Yes — you'll need your own OpenAI/Claude/Gemini account and API key. I integrate using it; you cover your own usage costs.
Will this app work offline?
Core AI features need connectivity, but I build in offline handling for navigation, cached data, and graceful error states so the app doesn't break without signal.
Can you connect AI to my own data (RAG)?
Yes, Standard and Premium include connecting the AI to your documents or knowledge base.
Do you fine-tune AI models?
No — I focus on API-based integration and prompt/context engineering, not training or fine-tuning models.
Can you add AI to my existing app?
Yes, that's the core focus — I integrate into existing React/Next.js/Node.js codebases as well as building new features from scratch.
Can this handle production traffic?
I build with production practices (error handling, rate-limit awareness), but large-scale infrastructure work is scoped separately.
