Senior Software Engineer

The role

You will design, build, and refine RL tasks, owning the full lifecycle from ideation through grading, failure analysis, and iteration. You will use coding agents heavily to direct them, evaluate their output, and contribute to shared infrastructure and tooling.

What you will do

• Design, build, and refine RL tasks
• Own the full lifecycle from ideation through grading, failure analysis, and iteration
• Work on complex tasks involving multi-step workflows, stakeholder interactions, large codebases, or system design problems
• Direct coding agents and evaluate their output
• Contribute to shared infrastructure and tooling
• Take on mentorship responsibilities for newer team members

Required qualifications

• Deep software engineering experience across multiple domains
• Strong intuition for AI model behavior
• Deep expertise in at least one area of software engineering
• Can code in Python
• Confident working independently on complex, ambiguous problems
• Extensive experience working with coding agents

Benefits

• health
• dental
• vision
• life insurance

About the company

Mechanize builds reinforcement learning environments that frontier AI labs use to train and evaluate their coding models. It is a ~20 person team in San Francisco.