Saif Ullah K.

I build AI agents that close tickets, publish content, and qualify leads while you sleep - not chatbots that just answer questions. Production LLM apps, RAG pipelines, and agentic workflows that survive real users and real load. I'm Saifullah, a full-stack AI engineer and Software Engineer at Turing, where I've shipped work for PolyAI, Waabi, and Glean. I'm Anthropic-certified across the Claude API, MCP, Agent Skills, and Claude Code - so if you need a Claude API developer who knows the model past surface-level prompting, that's home turf. Top Rated Plus. 100% Job Success. 10+ years in software. Most freelancers stop at wiring up an API call. I own the system around the model: architecture, frontend, backend, deployment, and the scaling that keeps it alive after launch. WHAT I BUILD - AI agents & agentic workflows - autonomous agents and copilots that automate real operations. If your team repeats a task all day, I turn it into a workflow that runs itself and reports back. - LLM apps on Claude & OpenAI - structured outputs, evals, and guardrails, so results are accurate instead of unpredictable. - RAG & chat-with-your-data - vector search pipelines that answer from your documents, not the model's imagination. - AI SaaS & MVPs - idea to live product, from investor-ready MVP to multi-tenant platform. RECENT BUILDS * Kastro - AI marketing agent SaaS on the Claude API that generates, schedules, publishes, and analyzes social content. Sole developer, in production in ~3 weeks. * Refio - AI reference-verification SaaS with automated email flows and AI voice calls. Built the automation engine and a race-condition-safe credit and billing system. * MiloTrack - multi-tenant NEMT and Medicaid billing SaaS with GPS trip logging and audit-ready exports. Owned trip, billing, and payroll; hardened the data pipeline. STACK Next.js, React, TypeScript, Tailwind · Node.js, Python, REST, GraphQL, WebSockets · Supabase, PostgreSQL, MongoDB, vector databases · Claude API, OpenAI API, agent frameworks, RAG, fine-tuning, evals · Docker, CI/CD, cloud deployment. Best fit: funded startups and founders who want one senior engineer to design, build, ship, and scale - not a team of juniors you have to manage. Risk-free start: if I don't deliver what we agreed on the first milestone, you get a full refund. Tell me what success looks like in your first 30 days, and I'll tell you exactly how I'd build it. Keywords to connect with me: AI Agent Development · Large Language Model (LLM) · Retrieval-Augmented Generation · Anthropic Claude · OpenAI API · Prompt Engineering · AI App Development · Chatbot Development · Vector Database · AI Development · Next.js · React · Node.js · TypeScript · Python · PostgreSQL · Supabase · API Integration · SaaS Development · Automation