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Research / Data Engineer – Post-Training & RL

RNB Consultancy • San Francisco, CA, US • published 2026-10-16 02:18:53.631374

Description

**Researcher or engineer? This role wants both, in one person.** A profitable, seed\-stage AI company in San Francisco creates long\-horizon reinforcement learning environments and post\-training data for leading AI labs in the US and abroad. Most data providers solve demand by adding people. This team treats post\-training data as a research problem and scales it with processes that improve themselves. Demand for their data is bigger than what they can deliver today, so they're growing a small, very strong core team of researchers and engineers. **What you'll own** * The full post\-training loop: infrastructure, training runs and the data that goes into them * Long\-horizon RL environments and tasks in many fields, from science to ML research itself * Scaling data generation through smarter, self\-improving tooling, not more headcount * Judging which real\-world tasks are worth building, because they matter to the labs and the economy **What you bring** * Real depth in ML research (think post\-training, RL, evals or interpretability) **and** serious engineering skills * You've post\-trained models yourself and built the datasets for it * A good eye for data, or the research abilit...

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