What does it take to make Postgres and Azure fit together cleanly, like puzzle pieces? In Episode 39 of Talking Postgres, Adam Prout—distinguished engineer at Microsoft and a founding architect of Azure HorizonDB—joins Claire to trace his engineering journey from MemSQL to Postgres. We dig into shared-storage architecture and how HorizonDB pushes more work into the storage layer; why the team chose Rust; and what “good systems programming” looks like when being paranoid is a feature, not a bug. Along the way: startup vs big company tradeoffs, and how working on databases exposes you to so many interesting parts of computer science.  

Previously on Talking Postgres:

• Talking Postgres Ep29: How I got started leading database teams with Shireesh Thota

Links mentioned in this episode:

• Blog post: Announcing Azure HorizonDB, by Charles Feddersen & Affan Dar
• CMUDB talk: HorizonDB: Co-Designing Postgres and Azure for Cloud-Native OLTP, by Adam Prout
• Research paper: Socrates: The New SQL Server in the Cloud
• Product page: Azure HorizonDB
• Video of POSETTE 2025 talk: Scaling Postgres to the next level at OpenAI
• Blog post: Scaling PostgreSQL to power 800 million ChatGPT users, by Bohan Zhang
• Blog post: Supporting ChatGPT on PostgreSQL in Azure, by Affan Dar, Adam Prout, & Panagiotis Antonopoulos 
• Docs: Azure Database for PostgreSQL
• GitHub repo: pgrx
• Discord: PostgreSQL Hacking server
• Conference: PGConf.dev 2026
• Conference Schedule: PGConf.dev 2026 Schedule