Staff ML Engineer - Post-Training & Sandbox

Dex is seeking a Member of Technical Staff to own end-to-end post-training pipelines and harness loops, bridging cutting-edge research and production-grade systems. You will curate large-scale training distributions, fine-tune models, and build sandboxed execution harnesses to test agents against complex tasks, with seniority spanning Senior to Principal levels.

You will design end-to-end post-training pipelines, architect sandboxed environments, and scale training-data infrastructure while