XTDB is an immutable database implemented in Clojure. Launched almost 5 years ago, it's bitemporal and document-based, built with the 'database inside-out' mantra of exposing internal components as swappable parts.

Clojure has been a true super-weapon, allowing us to iterate quickly and prototype new approaches with ease. It made the epic task of building something as complex as a database actually possible.

XTDB is evolving. We've been proving a new query engine, new storage mode, and more powerful temporal functionality.

In the talk, I'll reflect on what we've learned so far building XTDB, and where we're taking XTDB next.