Staff ML Engineer – Post-Training & Sandbox Systems

Dex, partnered with frontier AI labs, seeks a Member of Technical Staff to own the post-training and harness loop, bridging research and production. You design post-training pipelines, sandboxed environments, and data infrastructure to train agents on complex tasks.

Based in London or Paris, you will lead SFT/RL workflows, build reproducible evaluation frameworks, and collaborate with researchers and software engineers to deliver production-grade systems.

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