Jack Freiermuth

I'm a full stack engineer with 12+ years shipping production web platforms. Most recently that meant React, TypeScript, and Next.js front ends with Node and PostgreSQL behind them at Topstep, a fintech trading platform serving more than 600,000 traders. Before that, two and a half years at Mailchimp setting the standards for email translation and running cloud migration work on one of the highest-traffic PHP applications on the internet.

The work I care most about right now is agentic engineering. I built the tooling my team used to work with AI agents: an 11-step pipeline that takes a Jira ticket to a reviewed draft PR in one command, custom MCP servers including one driving an app that ships no API at all, a 28-skill reusable agent library documented so other engineers could stand up the same workflow, and token analytics that keep the costs honest. Plenty of engineers use AI tools. I build the infrastructure that makes them reliable enough for a team to depend on.

Off the clock I run a self-hosted automation stack: 25 custom MCP servers, workflow automation, and LLM observability wired through Langfuse. Same skills, pointed at my own life. Most of the projects on this site came out of that habit, and it is the reason I tend to have already built a small version of whatever a team is about to need.