Member of Technical Staff - AI/ML Infrastructure Engineer, RL Post-training at Preference ModelPreference Model · San Francisco

Workplace: On-site

Type: fulltime

Posted: 2026-10-19

Skills: AWS, DockerABOUT US Preference Model is a superintelligence data research company. We build RL environments for training capable, better-aligned superintelligences. Almost every aspect of how a model behaves is shaped by the reward signals it's trained on. The biggest problem with AIs today is that they don't always do what we intend. Sometimes that's because they aren't capable enough, and sometimes it's because they aren't aligned. Both problems come down to the training objectives. We're trying to address both of these issues in the most direct, highest leverage way available to us, which today means researching how to build RL environments better, not just for the AIs of today but for the AIs as they will be when they outsmart us. Over the past year, we've built RL environments for several frontier labs, and we're backed by $16M in seed funding led by a16z. Our founding team has previous experience on Anthropic’s data team building data infrastructure, and datasets behind Claude. ABOUT THE ROLE Frontier research moves only as fast as its infrastructure permits. Building solid infrastructure is foundational to our mission of pushing self-directed learning as far as it can go. We are looking for Senior ML Infrastructure Engineers to build the infrastructure and systems that power the frontier of post-training on large language models. This role involves building scalable infrastructure to enable high-throughput systems and shape how our research is run, bringing us closer to models that can train themselves on what they aren't yet good at. WHAT YOU WILL DO - Design, build, and scale the compute, scheduling, and data infrastructure that powers post-training research on our in-house RL environments - Develop and maintain core ML framework primitives and internal tooling that researchers rely on daily, accelerating reproducible experimentation and reducing time from idea to result - Build evaluation and benchmarking infrastructure, monitoring, logging, and debugging tooling, an…Sign in to see the original postingBrowse more developer jobs on RoleBurst