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Machine Learning Systems Engineer, RL Engineering

San Francisco, CA💼 Full-time💰 $500,000–$500,000🗓 2026-04-01 → 2026-09-25

Core

Build and maintain the algorithms and infrastructure for training AI models (RLHF) to support researchers in creating reliable, steerable AI systems.

Role type

Senior ML Systems Engineer (Reinforcement Learning)

Builds

High-performance distributed training systems and tools for LLM finetuning

Domain

Artificial Intelligence / Large Language Models / Reinforcement Learning

Deliverable

production ML models

Required skills

Software engineering, distributed systems, Python, LLM finetuning algorithms (RLHF), system profiling, instrumentation, debugging training pipelines

Preferred skills

High performance computing, large scale distributed systems, LLM training experience

Technologies

Python

Responsibilities

Profile reinforcement learning pipelines to identify improvements; Build systems to launch and monitor training jobs; Modify finetuning systems for new model architectures; Implement instrumentation to resolve performance bottlenecks (e.g., GIL contention); Diagnose and fix training slowdowns; Implement new training algorithms proposed by researchers

Seniority

Senior, hands-on IC

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