https://speakerdeck.com/ededwill 2026-04-08 00:24:45 -0400 Andromeda is Meta's next-generation ad retrieval system. It is the first and most critical stage of the ad delivery pipeline, responsible for scanning millions of potential ads in milliseconds to create a refined shortlist of a few thousand candidates for a specific user. This shortlist is then passed to the later stages of ranking and auction. Andromeda is Meta's next-generation ad retrieval system. It is the first and most critical stage of the ad delivery pipeline, responsible for scanning millions of potential ads in milliseconds to create a refined shortlist of a few thousand candidates for a specific user. This shortlist is then passed to the later stages of ranking and auction. Wed, 08 Apr 2026 00:00:00 -0400 https://speakerdeck.com/ededwill/andromeda https://speakerdeck.com/ededwill/andromeda