← All posts
John Zenk

Author

John Zenk

Principal Engineer at Nash

John Zenk is a Principal Engineer at Nash, the autonomic logistics platform that unifies decisioning and execution across fleets, carriers, and fulfillment networks. John joined Nash in 2022 as an early engineer and became the company's first Principal Engineer. Before Nash, he built ML infrastructure at Primer.ai and led applied machine learning at Arrow Electronics. He holds a PhD from Johns Hopkins.

Posts by John Zenk

2 posts
A Nash engineering benchmark instrument comparing Python and Rust webhook throughput
Engineering
7 Min Read

Why we rebuilt our busiest webhook endpoint in Rust

A retry storm saturated our shared Python webhook servers. We rebuilt the busiest path in Rust, raising tested throughput from about 30 to more than 400 requests per second while moving that traffic…
At Nash, Everyone Ships — editorial cover, navy aurora field with the chartreuse Nash mark
Engineering
12 Min Read

At Nash, Everyone Ships

We built an in-house coding agent, Carl, so the people closest to the work, not only engineers, could ship the fixes themselves. Here is what changed once everyone could ship, and how we built it.