Location: San Francisco (Hybrid: 3 days in SoMA) | Open to North America (5 days/month in SF)

Type: Full-Time

Team: Engineering Tribe

Focus: Senior Full-Stack Engineering

Who We Are

Seldon is a high-velocity team of exited founders, engineers, researchers, and adventurers building the future of human-AI behavior.

The hardest part of building products isn’t writing code - it’s predicting human behavior.

Until now, it’s been guesswork. Seldon changes that. We simulate real user behavior before anything ships.

Who We Are Not

• We are not your average SF startup. We’re a diverse team of 20 people - hailing from 10 countries and speaking 10 languages with a range of non-traditional backgrounds.
• We are not a remote-first zoom culture: We value the energy of solving hard problems on a whiteboard in our SF HQ.
• We are not “researching to learn”: Research and product move in tight, high-velocity loops. If it doesn’t become code to solve a customer problem, it doesn't exist.

The Seldon OS: How We Work

We operate under Seldon OS - a playbook for how we build, collaborate, and make decisions in a high-velocity environment:

• Anchor Days: We’re in the SF HQ (SoMA) 3 days/week (Mon, Tues, Thurs) to solve hard problems together.
• Core Collaboration Hours: We’re online 9-11am PT daily so the whole team (SF ↔ UK) can collaborate in real time.
• Deep Work: Outside of that, we protect uninterrupted time to build.

What You’ll Own & Build

As a Member of Technical Staff within the Engineering Tribe, you won’t just be writing code - you’re building the product and the systems that turn simulated behavior into real product decisions.

You’ll work across the stack, connecting complex backend systems (multi-agent simulations, evaluation pipelines) to frontend experiences that customers rely on to decide what to build next.