[ About us ]

We build the tools we wished we had at 2 a.m.

PROMPT ZERO started as an internal tool at a company where a single prompt change took down checkout for four hours. Today it powers AI features for more than 2,000 teams.

Berlin · San Francisco · Remote

How we work.

Four principles that survive every reorg, launch and all-hands.

Evidence over vibes

Every decision, like every prompt, ships with data attached.

Boring infrastructure

We obsess over uptime so your AI features can be exciting.

Small, sharp team

Twenty-four people. Zero managers of managers.

Customers in the room

Every engineer spends a day a month on support.

[ Team ]

The humans behind the machines.

Mara Kessler

Co-founder & CEO

Jonas Weber

Co-founder & CTO

Ava Lindqvist

Head of Product

Leo Martins

Staff Engineer

Priya Raman

ML Research Lead

Daniel Cho

Developer Advocate

Hannah Becker

Security Engineer

Marcus Oyelaran

Design Lead

Engineers ✦
Engineers ✦
Researchers ✦
Researchers ✦
Designers ✦
Designers ✦
Writers ✦
Writers ✦
Tinkerers ✦
Tinkerers ✦

We are hiring.

Remote-first, Berlin-rooted, and allergic to busywork. Come build the boring infrastructure behind exciting AI.

See open roles