Stephan Schmidt

Just Use Postgres for Everything

How to reduce complexity and move faster

TLDR; just Postgres for everything.

We have invited complexity through the door. But it will not leave as easily.

One way to simplify your stack and reduce the moving parts, speed up development, lower the risk and deliver more features in your startup is “Use Postgres for everything”. Postgres can replace—up to millions of users—many backend technologies, Kafka, RabbitMQ, Mongo and Redis among them.

This makes every application easier to develop, scale and operate.

Less moving parts means fewer developers for parts that don’t provide value or just replicate existing functionality (frontend) and more developers on parts (like the backend) that does provide value to customers. What if you could increase feature output by 50% without higher costs? For developers: What about a lower cognitive load? You really deeply understand all moving parts? No more imposter syndrome?

Just Use Postgres

Use Postgres for caching instead of Redis with UNLOGGED tables and TEXT as a JSON data type. Use stored procedures or do as I do, use ChatGPT to write them for you, to add and enforce an expiry date for the data just like in Redis.
Use Postgres as a message queue with SKIP LOCKED instead of Kafka (if you only need a message queue). Or as a job queue in Go with River
Use Postgres with Timescale as a data warehouse.
Use Postgres with pg_analytics as an in memory OLAP with Apache Datafusion
Use Postgres with JSONB to store Json documents in a database, search and index them - instead of Mongo.
Use Postgres as a cron demon to take actions at certain times, like sending mails, with pg_cron adding events to a message queue.
Use Postgres for Geospatial queries.
Use Postgres for Fulltext Search instead of Elastic.
Use Postgres to generate JSON in the database, write no server side code and directly give it to the API.
Use Postgres with auditing with pgaudit
Use Postgres with a GraphQL adapter to deliver GraphQL if needed.