AfterQuery

AfterQuery (operating at afterquery.com) is an applied research lab specializing in high-quality training data solutions for frontier AI and foundation model development. Founded in 2025 by Carlos Georgescu and Spencer Mateega, the company redefines how AI systems learn by capturing real-world professional reasoning from domain experts. Unlike traditional data annotation methods, AfterQuery focuses on curating nuanced, context-rich datasets that reflect authentic human expertise. Under the hood, its platform leverages crowdsourced contributions from software engineers, PhDs, and industry specialists to document complex problem-solving processes. This approach enables AI labs and developers to train models with precision, accelerating breakthroughs in language understanding, decision-making, and specialized knowledge domains. Backed by a $30 million Series A at a $300 million valuation, led by Altos Ventures, AfterQuery is positioned to become Y Combinator’s fastest unicorn, reshaping the future of AI training data.