Lead Research Engineer, Data Quality

About the Role We're an early-stage AI/ML infrastructure company (11–50 people) building the platform that AI labs and businesses use to create, manage, and scale reinforcement learning (RL) environments and high-quality post-training datasets. We're looking for a Lead Research Engineer, Data Quality to own the strategy and systems that measure, improve, and scale training data for frontier agents. In this role, you'll lead the data quality team, shape our internal research culture, and define what makes agent training data truly useful — not just superficially correct. You'll work on-site in San Francisco, CA . Visa sponsorship is available. What You'll Do Lead the data quality team in building systems that evaluate thousands of tasks across RL environments, synthetic data, benchmarks, and domain-specific workflows. Define the company's data quality strategy — build QC systems, enforce standards, and design experiments to grade agent outputs. Develop novel methods for validating synthetic data at scale, including failure-mode analysis, task mutation checks, and trajectory auditing. Partner with research engineers, domain experts, and data vendors to diagnose quality issues and improve data generation workflows. Translate qualitative research insights into production systems: internal tools, dashboards, validation pipelines, and feedback loops. Help build internal research taste around what makes agent training data realistic, learnable, diverse, reliable, and useful. Mentor research engineers to maintain a high bar for technical rigor, clarity, and execution speed. What We're Looking For Required (dealbreakers): 5+ years of experience in a research or data quality engineering role, specifically building systems for AI/ML data evaluation. Demonstrated experience leading technical projects or teams in data quality or AI/ML evaluation. Advanced proficiency in Python, Docker, and Linux environments. Also required: Ability to reason deeply about characteristics of high-quality training data (realistic, learnable, diverse, reliable) for AI agents. Experience translating research insights into production systems and data pipelines (e.g., validation pipelines, feedback loops). Experience developing and implementing methods for validating synthetic data at scale. Experience collaborating with research engineers, domain experts, and data vendors to diagnose quality issues. Track record mentoring engineers on technical rigor and execution speed. Comfort navigating complex systems involving domain experts, vendors, generated data, model outputs, graders, and infrastructure. Nice to have: Experience leading teams on ambiguous technical projects from problem definition through implementation and iteration. Experience working with subject-matter experts to convert domain judgment into scalable review or generation systems. Experience designing metrics, experiments, and QA/QC processes from scratch. Prior early-stage startup experience and comfort operating independently in fast-paced environments. Strong written communication skills — able to explain methodology clearly to researchers, engineers, and external audiences. Compensation & Benefits Salary: $150,000 – $250,000 USD annually, depending on experience. Early-stage equity participation. Visa sponsorship available. Location This is an on-site role based in San Francisco, CA . Candidates must be willing to work in-office. Visa sponsorship is available for qualified candidates.