Sr. Model Engineer, RL Training Framework

SR. MODEL ENGINEER, RL TRAINING FRAMEWORK

The RL infrastructure team is looking for an engineer to help develop our RL training framework.

Design and implement the systems backing all RL workloads at SpaceXSI, from small scale ablations to production training runs

Profile, debug, and optimize end-to-end training performance

Improve scalability and observability of the RL stack

Experience writing production-quality code in Python, PyTorch, JAX, Rust, or C++

Experience training large models (e.g., pre-training, post-training, fine-tuning, or RL training of neural networks with 1B+ parameters)

Experience building, debugging, and optimizing efficiency of large-scale distributed systems

Experience with large scale LLM training infrastructure

Experience with RL numerics

Strong knowledge of reinforcement learning techniques

Comfortable diving into unfamiliar areas and solving problems at all levels of the stack

$180,000 - $400,000 USD