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Senior ML Platform Engineer

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Build and maintain ML platform infrastructure for RL environments, including Karotte framework, containerized deployments, and lab integrations. Automate delivery pipelines, sandbox untrusted code, and develop internal tools for environment builders. Requires 5+ years in ML platform engineering, container orchestration, and Python library/API development.

Key Highlights
Own ML platform systems for RL environment delivery to partner labs
Automate end-to-end delivery pipelines and sandboxing infrastructure
Develop and maintain Karotte (open-source RL environment framework)
Key Responsibilities
Build and maintain Karotte (open-source RL environment framework)
Automate delivery pipelines for RL environments to partner labs
Develop and scale infrastructure for building/running/grading environments
Create internal tools for environment builders (CLI, docs, monitoring)
Ensure safe execution of untrusted code via sandboxing and resource limits
Technical Skills Required
ML Platform Engineering Container Orchestration (Docker, Kubernetes) Python (APIs/Libraries)
Benefits & Perks
Competitive cash and equity compensation (>90th percentile)
Health, vision, dental benefits
401K match
Visa sponsorship & relocation support
Lunch and weekly snack orders provided
Nice to Have
Experience with RL environments or eval harnesses
Familiarity with RL post-training/inference stacks (e.g., Ray, SkyPilot)
Background in sandbox/code-execution infrastructure (e.g., Firecracker, gVisor)
Early platform engineering experience at startups
Maintenance of open-source developer frameworks

Job Description

About Us

Preference Model is a superintelligence data research company building RL environments for training capable, better-aligned superintelligences. We address alignment and capability issues in AI by improving RL environments for current and future AI systems.

About the Role

As an MTS on our ML Platform team, you will own the systems that package, sandbox, and deliver RL environments to partner labs. This includes Karotte (our open-source environment framework), internal platform for building/running environments on CPU/GPU/TPU, and integrations for lab delivery. Success in the first six months includes automating delivery paths for partner labs.

What You Will Do

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