Spring Boot Tutorial 0/110 lessons ~6 min read Lesson 95
Scalable Backend Systems
Scalable systems are built on a few invariants: stateless services, shared-nothing data, async where possible, observable everywhere.
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Focus
2 guided sections
Practice signal
Concept-first lesson
Career prep
Foundation builder
Introduction
Scalable systems are built on a few invariants: stateless services, shared-nothing data, async where possible, observable everywhere.
Understanding the topic
- Stateless services — any replica can serve any request.
- Externalise state — DB, Redis, S3, Kafka.
- Asynchronous boundaries — queues for slow / unreliable work.
- Caching layers — CDN → Redis → DB.
- Backpressure — bounded queues, timeouts, circuit breakers.
- Idempotency end to end — retries are inevitable.
- Partitioning — by tenant, region, or hash key.
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