Engineering insights

EngMock Blog

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

Coding InterviewOctober 26, 2026

LeetCode-Style Mock Interview vs Solo Practice: What Each One Trains

Learn how solo algorithm practice and live coding mock interviews build different skills—and how to combine them without overfitting to memorized solutions.

10 min readRead full story

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

PreviousPage 1 of 2Next