Research Scientist - Frontier Data

San Francisco, United StatesOn-site

Responsibilities

What You'll Do - Design data slides and explore data shapes that expose meaningful model failure modes across domains like finance, code, and enterprise workflows - Build and refine evaluation rubrics and reward signals for RLHF and RLVR training pipelines - Model annotator behavior and run experiments to improve different model capabilities - Develop quantitative frameworks for measuring dataset quality, diversity, and downstream impact on model alignment and capability - Partner with lab research teams

We serve every frontier AI lab with the mission of delivering the best data to power the best models.
This is a rare opportunity to join a company at a defining moment in AI.
We're based in San Francisco and backed by leading investors including Altos Ventures, BoxGroup, and Y Combinator and angels from Google DeepMind, OpenAI, Anthropic, Meta Superintelligence Labs, and Microsoft AI and are based in San Francisco.
About AfterQuery AfterQuery builds the training data and evaluation infrastructure that frontier AI labs use to make their models better.
Working directly with research teams at top AI labs, you'll experiment with data collection strategies, diagnose model failure modes, and develop the metrics that determine whether a model is actually getting better.

Since raising our $30M Series A at a $300M valuation, AfterQuery has grown well over a $100M revenue run rate.
- Genuine obsession with how data structure, selection, and quality drive model behavior - Ability to design lightweight experiments, move fast, and extract actionable insights from messy results - Comfort working across domains (you'll touch finance, software engineering, policy, and more) - Strong quantitative instincts and familiarity with LLM training pipelines, RLHF/RLVR, or evaluation methodology - A bias toward building over theorizing Compensation Structure: - Annual target cash compensation of
benefits (UberEats and ride share stipend, comped Equinox, 401K with match, health, dental, and vision insurance)