Stefan S.

I build production AI systems for SaaS founders and marketing teams using the Claude API, Claude Code, and MCP. Top Rated, 100% JSS, $100K+ earned across 23 contracts. Recent: a content engine on a 29-domain client portfolio. Most "AI projects" I see arrive already burned. You hired a generalist who shipped a chatbot that hallucinates. You bought a workflow template that breaks every Tuesday. Your team spent two quarters on a POC that never reached production. The shiny demo never survived the first 1,000 real users. Here's what's usually broken: 1. Your content team publishes 4 articles a week, and AI search never cites any of them. 2. Your "AI tool" needs three operators and breaks every Tuesday. 3. You have a marketing automation stack that nobody can extend without breaking the rest of it. What I actually build: Production AI systems: agents, marketing automation engines, and full SaaS that still work when you're asleep. The stack is opinionated and Claude-only: You get a working system, not a Loom of a working system. Recent work that's already shipped AI-search audit stack: grades any domain on whether ChatGPT search and Google AI Overviews will cite it. Live across a 29-domain client portfolio. Marketing engine that runs without you: TikTok, Instagram, cold email on autopilot. Rebuilt from an open-source system that hit 15M+ TikTok views. A boutique fitness studio replaced WhatsApp and spreadsheets with a SaaS I built. Live in production. Steel fabrication plants used to ship on paper. I built the platform that replaces it. Shift managers get 30–60 minutes a day back. Risk reversal Two-week paid pilot at fixed scope. We agree on the success metric on day 1. If the prototype doesn't hit it, I refund the milestone. Upwork's review window is your safety net. Who this is for - B2B SaaS founders pre–Series B who can name the metric they want to move. - Marketing/SEO teams who need an AI workflow that doesn't read like AI. - Agencies offering AI services who need a builder who can ship and explain it to a marketer. - Local SaaS operators (fitness, manufacturing, services) ready for a real production system instead of another POC. Not for: clients shopping for the cheapest no-code automation freelancer. Clients who can't articulate a metric. Clients who require OpenAI or GPT specifically I run a Claude-only stack on principle, and the trade-off is conviction and capability.