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System Design Notes
We publish two posts each week focused on practical architecture decisions you can apply in interviews and production systems.
New posts every Tuesday and Friday. Each post links to topic hubs, guided labs, and challenges so you can practice immediately.
Current Posts
Mar 6, 2026 · 8 min read
Consistent Hashing Explained: How It Works in Distributed Systems
Understand consistent hashing from first principles: why naive modular hashing breaks, how the hash ring works, and when to use virtual nodes.
Mar 5, 2026 · 9 min read
CDN in System Design: When and How to Use a Content Delivery Network
Learn when a CDN actually helps, how edge caching works, and the cache-key and purge decisions that matter in real architectures.
Mar 4, 2026 · 10 min read
Back-of-the-Envelope Estimation for System Design Interviews
A step-by-step framework for capacity estimation: QPS, storage, bandwidth, and memory calculations that interviewers actually expect.
Mar 3, 2026 · 9 min read
Database Scaling Strategies: Replication, Sharding, and Partitioning
A practical guide to scaling databases in system design: when to replicate, when to shard, and how partitioning strategies affect your architecture.
Mar 2, 2026 · 8 min read
Message Queue Architecture for System Design Interviews
Understand when and how to use message queues in system design: decoupling, backpressure, delivery guarantees, and the operational patterns that matter.
Feb 20, 2026 · 7 min read
Queue-First API Design for Burst Traffic
Use synchronous API boundaries for intent capture and asynchronous queues for expensive work, retries, and operator visibility.
Feb 17, 2026 · 8 min read
Cache Invalidation That Does Not Burn Your Team
A practical pattern for choosing TTLs, write paths, and invalidation triggers without turning cache logic into a production risk.
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