Java Case studies
The problems asked by name. Each rewards a different core idea, which is why the same generic answer does not fit all of them.
3 concepts · 9 interview questions
What this topic covers
Every concept in case studies, and the questions each one gets asked as. Where a question links, it has a full write-up.
Write-heavy systems
Systems where ingestion dominates: metrics, logs, click streams. The design question is buffering, batching and what may be lost.
- Design a URL shortener.
- Design a rate limiter as a shared service.
- Design a metrics ingestion pipeline.
Read-heavy systems
Systems where a small amount of data is read enormously often. These are cache and fan-out problems.
- Design a news feed.
- Design a product catalogue with search and filters.
- Design a leaderboard.
Real-time and asynchronous systems
Systems where delivery, ordering and presence matter more than raw volume.
- Design a chat application.
- Design a notification service that must not send twice.
- Design a job scheduler that survives restarts.