concurrency

Explains how `&self` on an async trait method with a `Send` future implicitly requires `Sync` on the implementing type, and offers fixes like switching to `&mut self` or using `Sync` interior mutability.

The article analyzes the scalability limitations of using PostgreSQL as a job queue, specifically highlighting performance bottlenecks caused by MultiXact SLRU contention under high concurrency. It explains why this architecture fails in production despite working well in development and suggests considering alternatives.

A deep dive into the evolution of async programming models—from callbacks to promises—highlighting how each wave solved prior resource and performance issues while introducing new ergonomic challenges.

An Atlassian Principal Engineer highlights how concurrency concepts intimidate junior engineers and dominate backend interview fears.