Founding Machine Learning Engineer

ABOUT THE ROLE

This is a founding ML engineering role at an early-stage AI startup, where you will own the machine learning function from day one. Working closely with founders and researchers, you will shape the technical direction of post-training pipelines, agent systems, and the broader ML roadmap as the team scales.

WHAT YOU'LL DO

• Structure, filter, and score experimental trajectories for 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 the technical direction of the ML team as it grows.

WHAT WE'RE LOOKING FOR

• 3 or more years in machine learning engineering roles with a track record of delivering production ML systems.
• Hands-on experience with post-training data pipelines, including structuring, filtering, and scoring training data.
• Demonstrated experience building agent environments, tool interfaces, and RL training systems.
• Production software engineering proficiency in Python and systems-level programming for ML infrastructure.
• Experience designing and implementing evaluation frameworks and benchmarks for ML models.
• Deep understanding of trajectory data, reward modeling, and agent decision-making systems.
• Experience building data validation, provenance tracking, and observability systems for ML pipelines.
• Background at a frontier AI lab or on a post-training or evals team at scale is a strong plus.
• High agency, comfort with ambiguity, and the ability to bridge research and production seamlessly.

COMPENSATION & BENEFITS

Salary range: $100,000 to $170,000 USD annually. Visa sponsorship is not available.

LOCATION

On-site in Munich, Germany (primary location), with additional offices in Zurich, Switzerland and San Francisco, California. Remote arrangements may be discussed on a case-by-case basis.