Backend Fundamentals Deep Dive: MySQL Internals, Redis, and the HTTP/HTTPS Request Lifecycle

Company: Bytedance

Role: Backend Engineer

Category: Software Engineering Fundamentals

Difficulty: hard

Interview Round: Technical Screen

Quick Answer: This question tests deep backend engineering knowledge across three core domains: MySQL InnoDB internals (logging, indexing, isolation), Redis persistence and eviction mechanics, and the full HTTP/HTTPS request lifecycle. It evaluates practical, systems-level understanding that backend roles commonly probe to assess readiness for production engineering work.