Rajwinder S.

AI Engineer | OpenAI API | GPT Integrations | AI Agents | Automation

I build AI that ships, not AI that demos well and breaks in production. Over the past two years, I have delivered end-to-end AI solutions for startups and product teams across the US, Canada, and Europe. My work spans GPT-powered persona builders, context-aware chat systems, real-time AI agent workflows, retrieval-augmented generation (RAG) pipelines, and AI automation workflows that replace manual processes entirely. Recent builds include an AI Persona Builder for OpinioAI where users create and interact with custom GPT-4 personas, a synthetic market research platform (SYMAR) that uses AI to generate survey responses and focus group insights at scale, and AI-powered chatbot and product recommendation systems for eCommerce brands on Shopify. My core stack covers OpenAI API (GPT-4, GPT-4o, Assistants, Realtime API), Claude and Anthropic API, LangChain, vector databases (Pinecone, Weaviate) for RAG, fine-tuning for domain-specific models, multi-agent systems, custom prompt engineering, Python, and Node.js. I handle everything from architecture and API design to deployment and performance tuning. What gives me an edge is my background in frontend development and Shopify eCommerce. Before specializing in AI, I spent years building production storefronts, subscription platforms, and custom integrations. When I build AI features, I know how to make them fit naturally into real products, not just work in a Jupyter notebook. Whether you are building an AI-powered product from scratch, integrating GPT into your existing platform, or need someone to take a proof-of-concept to production, let's talk.