Sr. Model Engineer, Post-Training & RL
xAI · Palo Alto, CA
Frontier labonsitesenior$180k–$600k
At a glance
Highlights
- Tackle the most critical post-training and RL challenges shaping Grok.
- Build Super Intelligence to help humanity understand the universe.
- Advance reasoning, truthfulness and real-world capabilities via RL.
What they offer
- equity
- comprehensive medical, vision, and dental coverage
- 401(k) retirement plan
- short & long-term disability insurance
- life insurance
- discounts and perks
Ideal candidate
Truth-seeking builder obsessed with making models deeply useful via post-training. Thrives in meritocratic teams, takes pride in craft and pushes AI boundaries as a power user.
Requirements
- Experience writing production-quality code in Python, PyTorch, JAX, Rust, or C++
- Experience training large models with 1B+ parameters (e.g., pre-training, post-training, fine-tuning, or RL training)
Lab profile
About xAI
Builds AI systems to understand the universe and advance human knowledge.
Known for
- Engineering excellence focus
- Large-scale data center operations
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