Founding Engineer - LLM Infra & Platform

Posted 8 Hours Ago
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San Francisco, CA, USA
In-Office
130K-220K Annually
Entry level
Artificial Intelligence • Gaming • Software
The Role
Own the infrastructure powering Pax Historia’s AI requests across 37+ models and multiple providers. Responsibilities include improving provider reliability, structured outputs, caching, routing, monitoring, cost efficiency, latency, and scalability for billions of monthly tokens. This founding engineer role requires strong fundamentals, attention to detail, data-driven decision-making, and rapid learning. The position is fully in-person in San Francisco and does not involve model training or self-hosted inference.
Summary Generated by Built In

Company

Pax Historia is creating the future of interactive entertainment.

We’re building the platform for worldbuilders, storytellers, and game devs to create and publish any ‘what if’ they can think of. So far, most of the 25k+ user published presets on our site are historical (eg, ‘what if Rome never fell?’), but fantasy and sci fi are the fastest growing categories on the site.

We have seen over 92 million rounds played and raised a 10M+ seed round in March. We’re backed by Y Combinator (W26), Bessemer, Pace Capital, Z Fellows, and more.

Role

Every game on Pax Historia depends on our ability to send huge numbers of requests across many AI providers and get the right response back quickly, reliably, and cheaply.

We’re hiring an engineer to own that system. You’ll work on provider reliability, structured outputs, caching, routing, and monitoring. At the end of the day, you will need to:

  • Ensure that the 37+ models on our site reliably handle our 30 billion+ monthly tokens.

  • Reduce costs and latency for our 60k+ daily active users wherever possible.

You will not be in charge of model-training. We do not run model inference ourselves.

If you’re obsessed with detail, data oriented, and have a strong tendency to verify everything, then this might be a great fit for you. We don’t expect you to have done this exact job before, but we are expecting you to be a fast learner with extremely strong fundamentals.

Logistics

You’ll be our 7th team member. We work in-person in San Francisco, 5+ days/week. We are open to sponsoring visas.

Comp will include meaningful equity to reflect your responsibility as a founding engineer.

Skills Required

  • Extremely strong engineering fundamentals
  • Fast learner
  • Obsessed with detail
  • Data oriented
  • Strong tendency to verify everything
  • Work in person in San Francisco five days per week
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The Company
HQ: San Francisco, California
6 Employees
Year Founded: 2024

What We Do

Pax Historia is an alternate-history sandbox game where players choose a country, a moment in time, and rewrite the course of history. What if Rome never fell? What if the Soviet Union survived? What if Genghis Khan ruled for another generation? We go beyond history, too. What if aliens invaded Earth? What if you were a college dropout creating a tech startup? The ability to create, edit, and copy custom maps, actors, historical context, and more means that users can play nearly any scenario they can imagine. In the last four months we've organically built a passionate fanbase of tens of thousands of daily active players. Players have created thousands of custom worlds/maps/flags and published them to our thriving community. We process millions of tokens an hour. Still-- we're only getting started. Reach out to start building with us.

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