Raj B.

Based in Montreal (EST), I build production AI SaaS products, AI agents, and full-stack applications using Claude, OpenAI, Python, FastAPI, Next.js, TypeScript, and PostgreSQL. I can help if you are building an AI product from scratch, adding AI features to an existing SaaS application, integrating external APIs, or need an experienced developer to take ownership of an existing codebase. Recent work includes: • Built the frontend and core AI backend for an AI media planning SaaS using Claude API, multi-round tool execution, 15+ AI tools, SSE streaming, prompt caching, and OAuth integrations. • Reduced AI API costs by approximately 90% through prompt caching, context management, and model routing. • Built 8 platform integrations connecting the product with Google, Meta, LinkedIn, TikTok, X, and other services. • Built Quellit AI, an AI-powered software testing platform using OpenAI, CrewAI, FastAPI, Celery, Next.js, and PostgreSQL. • Built AI agent payment and credit infrastructure, including MCP servers, APIs, SDKs, AI integrations, background services, and developer tooling. • Built production systems using Python, FastAPI, Node.js, Rails, PostgreSQL, Redis, Docker, AWS, and GCP. What I can help you with: • AI agents and tool-calling systems • Claude API and OpenAI API integrations • AI SaaS product development • RAG and document-based AI applications • MCP servers and AI integrations • Python + FastAPI backend development • Next.js, React, and TypeScript applications • REST APIs and backend architecture • OAuth and third-party API integrations • Background jobs and asynchronous processing • PostgreSQL and database design • Refactoring and improving existing applications • Debugging and production issue resolution • Docker, CI/CD, AWS, and GCP deployments I am comfortable joining an existing engineering team or taking ownership of a feature from architecture through production. I use tools such as Claude Code and Cursor in my development workflow, but I review the generated code myself. I pay particular attention to architecture, database changes, migrations, authentication, payments, external integrations, and anything that can affect production data. If you already have a product or technical specification, send it over. I can review it and tell you how I would approach the implementation.