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I will integrate gpt 4o, claude or gemini API into your app or website
Harshal D
About this gig
Need to integrate an LLM (GPT-4o, Claude, Gemini, or Llama) into your app, website, chatbot, or backend? I ship it cleanly: working code, proper error handling, and prompt engineering that performs in production.
WHAT I INTEGRATE:
OpenAI GPT-4o, GPT-4, GPT-3.5
Anthropic Claude (Opus, Sonnet, Haiku)
Google Gemini (Pro, Flash)
Open-source: Llama, Mistral, Groq
Streaming, function calling, structured outputs
AI agents and multi-step workflows
WHAT YOU GET:
- Clean, documented code you own (Python or Node.js)
- Prompt engineering tuned for your use case
- Error handling, retries, rate-limit management
- Token tracking and cost optimization (Standard & Premium)
- Integration tests before handoff
STACKS:
Python: Flask, FastAPI, Django, LangChain
Node.js: Express, Next.js API routes
Frontend: React, Vue, Next.js
PROOF I SHIP:
- Parallel GPT-4 + Claude pipeline for DevBridge (65% time saved)
- Multimodal AI integration at Sambhav AI (EdTech, production)
- Published researcher (IJCNIS, IRJET)
- GitHub: github.com/harshaldonarkar
- Portfolio: harshaldonarkar.github.io
Message me before ordering so I can confirm scope and recommend the right package for your use case.
Get to know Harshal D
Harshal D
AI Engineer: RAG Pipelines and LLM Integration Expert
- FromIndia
- Member sinceApr 2022
Languages
Hindi, Marathi, English
AI Engineer with 2 published research papers (IJCNIS, IRJET) and production deployments. Previously at Sambhav AI where I built Whisper+OCR pipelines and multimodal AI — delivered 50% performance gains. I specialize in RAG systems with LangChain, LLM integration (GPT-4, Claude, Gemini), computer vision with OpenCV, OCR pipelines, and production ML deployment with Docker. I ship working code, not prototypes. Portfolio: harshaldonarkar.github.io | GitHub: harshaldonarkar
My Portfolio
FAQ
Which LLM should I use — GPT-4o, Claude, or Gemini?
Depends on your use case. GPT-4o is best for general tasks and function calling. Claude is better for long context and nuanced reasoning. Gemini Flash is cheapest for high-volume. I'll recommend based on your requirements before you order.
Can you work with my existing codebase?
Yes. Share your repo or a description of your stack and I'll integrate the LLM into your existing structure — no rewrites unless you want them.
Do you handle API key security?
Absolutely. All keys go in environment variables, never in code. Standard and Premium include a secrets management guide for production deployment.
What about rate limits and cost control?
Standard and Premium include token usage tracking, retry logic with exponential backoff, and caching where it makes sense. Premium adds a full monitoring dashboard.
Can you build AI agents or multi-step workflows?
Yes — included in Premium, or available as an extra on Basic/Standard. I've built multi-step pipelines with tool calling, memory, and fallback logic.
Do you provide the prompts or do I?
Either works. If you have prompts, I'll optimize them. If not, I'll write and test prompts tuned to your use case — this is included in all packages.
What if the integration breaks after delivery?
All packages include revisions. For production issues beyond revisions, I offer post-delivery support at an hourly rate — just message me.
Can you integrate open-source models like Llama or Mistral?
Yes — via Groq, Together AI, Replicate, or self-hosted (Premium only, as self-hosting needs infra setup).
