OpenAI, ChatGPT, Claude & Gemini API Integration
You don't need a new product to benefit from AI — you need the right AI features inside the product you already have. I integrate OpenAI (ChatGPT), Anthropic Claude, and Google Gemini into existing React, Next.js, and Node.js applications with streaming responses, cost controls, and secure server-side API handling.
What you get
- ▹Secure server-side API integration (keys never exposed to the browser)
- ▹Streaming chat and generation UI in React/Next.js
- ▹Structured JSON outputs for reliable data extraction
- ▹Semantic search with embeddings
- ▹Usage tracking, rate limiting, and cost controls
- ▹Fallbacks between providers for higher reliability
Common use cases
- ▹AI writing assistant inside a CMS or SaaS product
- ▹Summaries of records, notes, and documents
- ▹Smart search across products or knowledge bases
- ▹Automatic tagging and categorization of content
- ▹Extracting structured data from free-form text
Why hire Muhammad Zaid for LLM Integration
Works with your codebase
I add AI features to existing React, Next.js, Node.js, and NestJS apps without a rewrite.
Cost-aware
Caching, model selection, and limits keep API bills predictable.
Multi-provider
Experience across OpenAI, Claude, and Gemini means the best model for each feature.
Technologies I use
See the full list on my skills page.
How we'll work together
- 01
Discovery
We discuss your goals, users, and constraints. I ask the questions that shape the right solution.
- 02
Plan & estimate
You get a clear scope, timeline, and fixed or milestone-based estimate.
- 03
Build
I develop in short iterations with regular demos so you see progress every week.
- 04
Launch & support
I deploy to production, hand over documentation, and stay available for support.
LLM Integration FAQ
Can you add ChatGPT to my existing website or app?
Yes. I integrate the OpenAI API (and Claude or Gemini if they suit the task better) into existing applications, typically through a secure backend endpoint and a streaming UI component.
Which is better: OpenAI, Claude, or Gemini?
It depends on the feature. I compare them on your real data for quality, speed, and cost, and often use more than one — for example a fast model for classification and a stronger model for complex writing.
Is my data safe when using AI APIs?
I keep API keys server-side, send only the data each request needs, and use provider settings that do not train on your API data. Sensitive fields can be masked before they reach the model.
More answers on the FAQ page.
Helpful guides
Related services
Ready to start your llm integration project?
Free consultation. Working remotely with clients worldwide.