Redis
An open-source database that keeps all its data in memory, which makes it extremely fast. Most often used as a cache.
What it tells you about a developer
Redis on a profile usually means backend work at meaningful traffic, because small projects rarely need it. It travels with the practical scaling skills: caching strategy, session handling, background jobs. A developer who can explain what they cached in Redis and why is describing real production performance work.
- Type
- Database
- Released
- 2009
- Used in
- BackendInfrastructure & DevOps
Redis holds its data in memory instead of on disk, so reads and writes finish in under a millisecond. Teams put it in front of a slower database as a cache, and also use it for job queues, session storage, and leaderboards. It appears in most production backends operating at real scale.