Platform Engineer, Infrastructure

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.

Responsibilities

• Architect and own whole parts of the platform end to end.
• Take the gnarly production problems nobody else has picked up.
• Make every product engineer faster — dev experience, deploy speed, abstractions.
• Build the agentic workflows that speed up you and your team.

Qualifications

This role is perfect for you if:

• You've rewritten an entire service in a couple of days because the technical debt annoyed you.
• You've broken prod, seen what went wrong, and learned from it.
• You ship fast, but never without rigorous testing.
• You get excited about complex problems with lots of constraints and edge cases.
• You care as much about the user journey as the technical requirements.

Tech stack

Python/FastAPI, PostgreSQL, Redis, Temporal/SQS, Terraform, AWS

Logistics

About 60% of the team is in San Francisco and the rest are remote, mostly US-based.

• If you're in SF: you'll be in the office most days. We think the best work happens in person. Most of the team is here five days a week, and a few do three or four days depending on family or long commutes.
• If you're remote: we're open to remote for some roles. We fly remote teammates to SF for three to four days a month.

We sponsor visas: H1B, O1, EB1, L1, STEM + OPT, and more. We can't successfully sponsor for every role and every candidate, but if we make you an offer we'll make every reasonable effort, and we retain an immigration law firm to help.

Benefits

• Equity on employee-friendly terms, including extended exercise windows and a combination of ISOs and RSUs.
• Health, dental and vision. We cover 100% of the premium on the Anthem Blue Cross Gold PPO, and 75% of premiums for dependents. (US only)
• 401(k) with up to a 4% match. (US only)
• Flexible time off and company holidays.
• All meals in the office, plus commuter benefits and relocation reimbursement if you’re moving to San Francisco.
• A high-spec laptop, monitor, and a whisper-friendly microphone.
• Regular team events and off-sites.
• 16 weeks of paid parental leave (12 weeks for non-birthing parent).

Pay

Compensation Range: $220K - $300K