Choosing Postgres, MongoDB, or DynamoDB: The 4 Questions That Actually Decide It

Book: Database Playbook My project: Hermes IDE | GitHub — an IDE for developers who ship with Claude Code and other AI coding tools Me: xgabriel.com | GitHub Picture the startup CTO with a 14-tab spreadsheet comparing Postgres, MongoDB Atlas, DynamoDB, CockroachDB, and Aurora. Cost columns. Latency columns. Replication-lag columns. Three of the columns are wrong. Two of them are measuring different things under the same heading. The team picks DynamoDB because the spreadsheet has the most green