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EngMock Blog

Deep dives into system design, distributed architectures, and technical interview strategies.

System DesignAugust 6, 2026

System Design Mock Interview Scoring Rubric: What Strong Evidence Looks Like

A practical rubric for requirements, estimates, APIs, architecture, reliability, trade-offs, and communication in a system design mock interview.

7 min readRead full story

AI System DesignMarch 4, 2026

How AI Assists in Estimation and Trade-offs during Distributed Systems Interviews

Stop memorizing. Start reasoning. This is a 5000-word deep analysis of how AI is fundamentally changing how engineers prepare for distributed systems interviews — from estimation to architecture evaluation.

22 min readRead full story

ArchitectureMarch 4, 2026

How to Design a Distributed Rate Limiter for 1M QPS

Scaling a rate limiter to 1M QPS requires addressing the bottleneck of single-threaded centralized Redis structures. Learn how to combine local in-memory caching with asynchronous Redis Lua Scripts.

15 min readRead full story

ArchitectureMarch 4, 2026

How to Design a Real-Time Chat Application like Discord

Handling 10 million concurrent active users on a chat application isn't just about WebSockets. Discover how to architect the Presence Service, Message Fan-out, and NoSQL storage engines.

14 min readRead full story

ArchitectureMarch 4, 2026

System Design Deep Dive: How Uber Calculates Surge Pricing in Real-Time

A comprehensive architectural breakdown of real-time geospatial matching, dynamic pricing algorithms, and handling millions of concurrent events.

15 min readRead full story

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