Aampe is a San Francisco-based company building agentic AI infrastructure for personalized customer experiences. Instead of relying on generative AI, it assigns a dedicated reinforcement-learning agent to every individual user that continuously experiments and learns what content to send, when, and whether to send anything at all. The platform has deployed over 100 million agents across hundreds of consumer apps on four continents, helping product, data science, and lifecycle marketing teams move from rule-based campaigns to continuous, per-user adaptation.
PostHog is an all-in-one, open-source developer platform that bundles product analytics, web analytics, session replay, feature flags, A/B testing, experiments, surveys, error tracking, a customer data platform, and a data warehouse into a single stack engineers can self-host or run in the cloud. Founded in 2020 by James Hawkins and Tim Glaser through Y Combinator, it lets product engineers track usage, ship features, and keep customer data in one place rather than stitching together a dozen SaaS tools. The company reached unicorn status in 2025 with a $75M Series E at a $1.4B valuation.
Paul Meinshausen is the CEO and co-founder of Aampe, a San Francisco company that deploys agentic AI infrastructure so consumer apps can learn from each user's behavior and adapt their messaging in real time. An anthropologist turned data scientist who started his career in US Army Intelligence, he co-founded the Indian fintech PaySense (acquired by PayU for $185M) before building Aampe with collaborators he first met in a military analysis unit. He argues that businesses win not by understanding the past but by making better decisions about the future, and that personalization should be about responsiveness rather than prediction.
LaunchDarkly is a feature management platform that lets software teams release, target, and measure code changes behind feature flags. Founded in 2014 in Oakland by Edith Harbaugh and John Kodumal, the company turned the homegrown 'if/else' toggle into an enterprise control plane used by more than 2,000 customers including Atlassian, IBM, Square, NBC, and Ryanair.
Pete Koomen co-founded Optimizely during Y Combinator's Winter 2010 batch, building it from a pivoted idea in week two of YC into a $100M+ ARR experimentation platform before its 2020 acquisition. A former Google product manager who helped launch Google App Engine, Pete brought engineering rigor and scientific method obsession to the messy world of product decisions. He co-authored the field-defining book 'A/B Testing: The Most Powerful Way to Turn Clicks Into Customers,' and now serves as a Group Partner at Y Combinator, where he advises early-stage founders on enterprise sales, AI product design, and the art of building companies that actually figure out what works.
Gustaf Alstromer is a General Partner at Y Combinator, the world's most prestigious startup accelerator. A Swedish-born, San Francisco-based operator-turned-investor, he spent five years scaling Airbnb's growth team from 3 to 100+ people before joining YC in 2016. At YC he has mentored 600+ startups with a combined valuation of $118B+, reviewed 9,000+ applications, and become one of Silicon Valley's most cited voices on growth, experimentation, and climate tech entrepreneurship.