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Recent Posts

Load Balancing: L4 vs L7, Algorithms, and Health Checks

A load balancer is usually the first box you draw after the clients, and the depth you can give on it is a fast proxy for how senior you sound. This covers L4 vs L7, the algorithms and their failure modes, health checks, and the mistake of moving your single point of failure instead of removing it.

May 10, 2026 Read

Non-Functional Requirements: How to Say 'Fast and Reliable' Like a Senior

Every system wants to be fast, scalable, and reliable, which is exactly why saying so is worthless. This post is about the sharper version: p99 under 200 ms, 99.99% availability, eventual consistency on the timeline — and the architectural lever each of those numbers forces you to pull.

May 1, 2026 Read

Back-of-the-Envelope Estimation for System Design

Most system design answers go wrong one step before the boxes and arrows: the candidate never works out how big the system is. Here are the four formulas, the latency numbers worth memorizing, and a worked Twitter example that turns four calculations into five architecture decisions.

Mar 29, 2026 Read

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