AfterQuery, San Francisco
As one of our core engineers, you’ll be critical in creating data infrastructure that will be shaping the future development of frontier models. You will be one of our first hires, and will get a lot of responsibility, owning entire projects end-to-end – meaning you can see your impact instantly.
Massive Opportunity: Forbes reported that we could be YC's fastest unicorn, reportedly raising at a $3.2 billion valuation, 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.
AfterQuery https://www.afterquery.com/ 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. Forbes reported that we could be YC's fastest unicorn, reportedly raising at a $3.2 billion valuation. 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.
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.
AfterQuerySan Francisco, California
$220K–$280K / yr
Posted Mar 8, 2026
AfterQuerySan Francisco, California
$140K–$200K / yr
Posted Oct 3, 2025
AfterQuerySan Francisco, California +1
Pay not posted
Posted Apr 12, 2025
AfterQuerySan Francisco, California +1
Pay not posted
Posted Dec 13, 2025
Model MLLondon, England, GB
$100K–$200K / yr
Posted Nov 19, 2025
ATGNew York City +1
$150K–$275K / yr
Posted Aug 4, 2026
Source: the AfterQuery Ashby job board. We last checked this job 3 h ago. We first saw it 6 days ago. A job on a job board does not always mean that the team interviews people now.
Funding records can have errors and can be missing. The company page has the links.
No one has reported an interview at AfterQuery yet. Did you interview there? Add the questions.
This base pay is above the median for ML and AI engineering jobs in the Bay Area with no level in the job title.
We compare the middle of each posted range. This is base pay as posted. The group does not include this job.