Model Engineer, Post-Training & RL is open at xAI in Palo Alto, CA. The posting gives a salary of $160K - $250K. Posted on Apr 28, 2026, and still on xAI’s careers page when we last checked, on Nov 14, 2026.
About the role
Design and run rigorous experiments that turn research ideas into measurable gains in model capability Improve model recipes through data quality, deduplication, and mixture experiments Define what makes RL data and rewards good, including grader design and preventing reward hacking Advance training science, from architecture and scaling experiments to post-training recipes for coding and computer-use agents Build…
The opening lines of the posting. The rest is on xAI’s careers page.
Hiring at xAI
xAI has 296 open roles right now, 20 of them remote. Most are in Engineering, Manufacturing & Trades and Operations. The median advertised salary across its roles with a published range is $205K. See all its roles
