Founding Machine Learning Engineer

About the Role

Own the machine learning function at an early-stage AI company, working with founders and researchers to shape post-training and agent systems. You will set technical priorities and help guide the growth of the ML team.

What You'll Do

• Structure, filter, and score experimental trajectories for training data pipelines.
• Design and implement evaluations and benchmarks for model reasoning, planning, and experimental progress.
• Build reliable agent environments, tool interfaces, observability systems, and replay infrastructure.
• Establish validation and provenance tracking for trajectory and data quality.
• Set ML roadmap priorities across systems, experiments, and hiring.
• Lead the technical direction of the ML team as it grows.

What We're Looking For

• At least 3 years of professional machine learning engineering experience building or delivering production ML systems.
• Strong machine learning and software engineering skills, including production experience with Python and systems-level programming for ML infrastructure.
• Hands-on experience with post-training ML, including data pipelines for structuring, filtering, and scoring training data.
• Experience designing and implementing evaluation frameworks and benchmarks for ML models.
• Knowledge of trajectories, reward structures, tool use, and agent environment design.
• Experience with reinforcement learning, agent environments, replay systems, debugging tools, data validation, provenance, or ML pipeline observability.
• Background in frontier AI research or scaled post-training and evaluation teams is valuable.
• Comfort bridging research and production, taking ownership, and working in an ambiguous environment.

Compensation & Benefits

Salary range: $100,000 to $250,000 USD annually. Visa sponsorship is not available.

Location

On-site in Munich, Germany. Other listed locations include Zurich, Switzerland, and San Francisco, California.