SpaceX was founded under the belief that a future where humanity is out exploring the stars is fundamentally more exciting than one where we are not. Today, SpaceX is actively developing the technologies to make this possible, with the ultimate goal of making life multiplanetary and expanding consciousness to the stars. SpaceXSI is building Super Intelligence to help humanity understand the universe. Our teams are building the full Super Intelligence stack: from our Colossus supercomputers, to Grok models, to our suite of applications, including Grok Bot, Grok Build, Grok Imagine, Grok Voice, and X. We're creating a powerful flywheel where more compute trains better models, better models power more useful products, and what we learn from people using those products shapes what we build next. RESEARCH ENGINEER SpaceXAI is building the future of coding. We train frontier coding agents https://cursor.com/blog/composer and scale RL on real user data to make them increasingly effective. ABOUT THE ROLE We’re looking for Research Engineers to build the training, inference, and data systems behind our frontier coding models. You’ll work directly with researchers to make progress repeatable and iteration fast. WHAT YOU’LL DO - Build our distributed training, inference, and RL infrastructure - Write libraries to simplify how researchers do large-scale data jobs - Architect the systems that turn Cursor user data into effective training data YOU MAY BE A FIT IF - You have a strong infrastructure/distributed systems background - You are able to architect and ship end-to-end with high ownership - You have strong intuitions about how language models work - You’re excited to learn more about ML #LI-DNI