Adam D'Angelo

AI-native observability and evaluation platform that helps engineering and product teams evaluate, log, and monitor AI agents and large language model interactions in production. Built on a custom database optimized for massive AI trace data, the platform enables teams to run experiments against real datasets, compare prompts side-by-side, catch regressions in CI, and inspect every trace with real-time latency, cost, and quality metrics.

PlanetScale is a serverless database platform built on Vitess, the open-source database clustering system originally created to scale YouTube. The platform provides horizontally scalable MySQL and PostgreSQL databases with database branching, non-blocking schema changes, and sharding without downtime.

Convex is an open-source reactive backend-as-a-service platform that provides a real-time database, serverless functions, and client SDKs for building live-updating web and mobile apps. The platform integrates a TypeScript-based document store and function runtime for queries and mutations. Convex went open source in March 2024.