SR. MODEL ENGINEER, RL TRAINING FRAMEWORKThe RL infrastructure team is looking for an engineer to help develop our RL training framework.
RESPONSIBILITIES:- 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
BASIC QUALIFICATIONS:- 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)
PREFERRED SKILLS AND EXPERIENCE:- 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
COMPENSATION AND BENEFITS:$180,000 - $400,000 USD
Base salary is just one part of our total rewards package at SpaceXSI, which also includes equity, comprehensive medical, vision, and dental coverage, access to a 401(k) retirement plan, short & long-term disability insurance, life insurance, and various other discounts and perks.
