Member of Technical Staff

Traverse is a research data lab building reinforcement learning environments for frontier AI labs. We focus on the non-deterministic, taste-dependent work that makes up most of the economy and that nobody else has figured out how to train models on. We work directly with the labs building the most capable models on earth as a thought partner. Backed by Y Combinator.

As a Member of Technical Staff, you will build the core infrastructure and environments that train AI models to do real work. You'll operate across the full stack, from designing reward functions and evaluation pipelines to building the tooling that lets us scale environment quality across new domains without it falling apart.

This is not a narrowly scoped role. You'll work on whatever matters most, and what matters most changes as we move into new domains and take on new lab partnerships. We care about raw engineering ability and taste, not credentials or keywords on a resume. No prior ML or AI experience is required.

• Design and build RL training environments across multiple verticals, working closely with domain experts and ML engineers
• Build infrastructure and tooling that enables environment quality to scale across domains
• Work directly with frontier AI labs to understand their training pipelines and integrate our environments into their workflows
• Own problems end-to-end, from scoping through implementation through evaluation
• Shape the technical direction of the company as an early team member

• Exceptional software engineering fundamentals and ability to ship production-quality code quickly
• Comfort with ambiguity and a bias toward building rather than planning
• Track record of owning complex technical projects end-to-end
• You learn fast and go deep on whatever you're working on

• Familiarity with ML training pipelines, RL concepts, or LLM post-training
• Experience building evaluation frameworks, reward models, or RL environments