Staff Platform Engineer, Infrastructure
ABOUT WISPR
We're building the first voice interface a billion people use every day.
Our first product, Flow, lets you talk instead of type anywhere on your computer or phone, and turns messy speech into polished text that is ready to send. It's scaled from $2M → $50M in ARR in under 12 months with millions of users and thousands of enterprise customers. How we think → https://wisprflow.ai/post/the-master-plan
The team is still small enough that every person shapes what gets built.
ABOUT THE ROLE
Every time someone talks to Flow, they're waiting — mid-sentence, cursor blinking — for their words to appear. 500ms feels like magic. 1000ms feels annoying. People use Flow hundreds of times a day, and they feel every single request.
Why this is hard: we've scaled our user base faster than our infrastructure could keep up with. We build and deploy our own voice models, and we've tuned our networking stack to hit P50 latencies of 500ms around the globe. But latency is just the beginning. Our platform layer sits behind every personalization feature, the multi-step workflows that turn speech into action, and the primitive infrastructure the rest of the product is built on. We're shipping new surfaces fast, which means the core platform now needs far more rigor and a lot more headroom.
We've built for millions of users and thousands of enterprises with a three-person platform team. You'd be on the ground floor, creating the systems that support the next hundred million.
WHAT YOU'LL DO
- Build the seam between product and ML: credentials, proxy, routing, experimentation.
- See the next scaling bottleneck two quarters early and fix it before anyone notices it existed.
- Architect and own whole parts of the platform end to end.
- Make every product engineer faster — dev experience, deploy speed, abstractions.
- Help set technical direction as the team goes from three to eight.
THIS ROLE IS PERFECT FOR YOU IF:
- You've rewritten an entire...