Founding Machine Learning Engineer
About the Role
This is a founding ML engineering role at an early-stage AI startup, giving you full ownership of the ML function from day one. Working directly with founders and researchers, you will shape the technical direction of post-training pipelines and agent systems while building the team around you.
What You'll Do
Structure, filter, and score experimental trajectories to build high-quality training data pipelines.
Design and implement evals and benchmarks that measure model reasoning, planning, and experimental improvement.
Build reliable agent environments, tool interfaces, observability systems, and replay infrastructure.
Establish robust validation and provenance tracking for trajectory and data quality.
Set ML roadmap priorities across systems, experiments, and hiring decisions.
Lead and grow the ML team's technical direction as the company scales.
What We're Looking For
3+ years of machine learning engineering experience delivering production ML systems.
Hands-on experience with post-training data pipelines, including structuring, filterin
