AfterQuery · San Francisco
Manufacturing & OperationsOperationsFullTimeposted 7d ago
AfterQuery is an applied research lab curating data solutions for foundation model development. We serve every frontier AI lab with the mission of delivering the best data to power the best models. In doing so, we can make expertise that once took a lifetime to build available to anyone who needs it.
Our customers are the ones building the foundation models themselves and our work sits directly in the loop of how those systems improve. This is a rare opportunity to join a company at a defining moment in AI. We are YC's fastest unicorn, valued at $3.2 billion. 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.
Massive Opportunity: We are YC's fastest unicorn valued at $3.2 billion and we're not slowing down.
Founding Impact: You will own and architect core infrastructure systems that power our platform from the ground up.
Equity & Growth: Competitive salary and meaningful equity. As we scale, you’ll have the opportunity to shape the engineering organization and lead major technical initiatives.
Strong Team: Our founding team has experience from Citadel Securities, Meta, Google, Silver Lake, and Morgan Stanley — work alongside world-class engineers and researchers.
We're looking for a Quality Control Lead to own the final checkpoint between raw data and delivered product. You'll be the person who decides what's good enough to ship, the coach who helps contributors get better, and the builder who automates away the errors that shouldn't happen twice.
Final Quality Review: Own the last quality checkpoint before datasets are delivered or published, auditing outputs (including code, technical, and reasoning data) for correctness, clarity, structure, and adherence to spec.
QC Process & Tooling: Work with infrastructure engineers to continuously automate and improve QC workflows
Cross-Functional Feedback Loop: Partner with data delivery teams to identify systemic quality issues, feed corrections back into contributor training, and prevent recurrence.
Metrics & Reporting: Own quality metrics and KPIs, reporting on error rates, root causes, and improvement trends to company leadership.
Operational Support: Contribute to company-wide initiatives across building, analysis, coordination, and execution as AfterQuery scales.
3+ years of experience in a technical role (software engineering, data science, ML engineering, or similar) with hands-on proficiency in at least one modern programming language
Proven ability to review, debug, and evaluate both code and technical data and knowledge work data for correctness, structure, and quality; demonstrated rigor in reviewing others' work
Experience building or leading a quality assurance/quality control function, ideally for a technical or data-centric product
Extremely high attention to detail and comfort making judgment calls on ambiguous or contested technical content
Strong leadership and communication skills; able to translate technical quality issues into clear, actionable feedback across a distributed team
High agency and strong work ethic; comfort operating with minimal direction in ambiguous, fast-moving environments
Genuine passion for AI and an entrepreneurial inclination
Demonstrated competitive success
Experience in AI training data, RLHF, or data-annotation quality assurance
Background reviewing datasets across multiple domains (code, reasoning, knowledge work)
Experience designing rubrics, grading criteria, or automated quality-check tooling/scripts
Familiarity with Claude Code or similar AI-assisted workflow tools
Computer science degree or equivalent hands-on engineering background
Health Insurance: Medical, Vision, Dental
401(k) with Employer Match
Daily Meals: Daily UberEats Stipend
Monthly Wellness Stipend
Commute Covered
We are an equal opportunity employer committed to providing a workplace free from discrimination and harassment. Employment decisions are made without regard to legally protected characteristics under applicable federal, state, or local law.
We comply with applicable pay transparency requirements and provide compensation ranges based on the position, qualifications, experience, and other relevant factors. Reasonable accommodations are available to qualified individuals with disabilities and for sincerely held religious beliefs, as required by law. This job description is intended to describe the general nature and level of work performed and is not an exhaustive list of all duties, responsibilities, qualifications, or working conditions associated with the position. We reserve the right to modify this job description as business needs change.