about

the long version — where i’ve worked, what i’ve shipped, and what i keep coming back to.

👋 Hi, I'm Zac Rosenbauer.

I've spent over a decade working in startups as a software engineer, manager, and executive. I've been fortunate to work with some amazing people and build some great products.

I've also made a lot of mistakes along the way. My hope is that through my blog I can share some of the things I've learned and help others avoid some of the mistakes I've made, or at least make new ones. 😅

The Road so Far

I started out my career by starting a consulting agency, PointStart, (while still in college) that built websites and e-commerce integrations aka lots of Wordpress sites & stores. After PointStart shut down, because I didn't enjoy building Wordpress sites, I joined neighborhoods.com as the 2nd engineer, to build out their real estate platform.

I took my first stab at the pre-seed, super early startup world with Precognitive (acquired by ShopRunner) as the VP of Engineering. After we were acquired, I joined ShopRunner as the Head of Platform Engineering, where I helped build out their platform engineering (aka DevOps) and fraud detection systems (cause of Precognitive). ShopRunner was acquired by FedEx in 2020 and I moved to a Director of Platform Engineering at FedEx Dataworks where I ran an organization of 100+ engineers.

After a year at FedEx, I decided to leave and join a startup again, but this time I wanted to start the start-up (not intending to be punny). I started Joggr with my co-founder, Seth, in late 2022.

What I'm up to now

Shipping open-source and writing here. Mostly TypeScript, Node, and Rust day-to-day, but I'm a purveyor of all languages and will reach for whatever fits the job.

Previously: I co-founded Joggr with Seth in late 2022 — the developer toolkit for building with AI agents. We gave engineering teams primitives for shipping AI-agent features that actually worked: context, evals, and the glue between codebase and model. We wound the company down in 2026.

The personal stuff

I live in New York City with my wife and dog, I train mixed martial arts and self defense systems at least 2-3 times a week, and I try to travel as much as I can. If you want to get to know the country side of me (I was born and raised in rural Ohio 🌽) just ask me about tractor pulls.

If you want to chat about startups, software engineering, or just want to say hi, feel free to reach out to me.