Explain Backend Fundamentals and AI Tooling

Company: Bytedance

Role: Backend Engineer

Category: Software Engineering Fundamentals

Difficulty: hard

Interview Round: HR Screen

Quick Answer: This question evaluates understanding of core backend and AI tooling topics including operating system concepts (processes vs threads), networking (TCP vs UDP), relational database fundamentals (primary keys, foreign keys, indexes), version control workflows (common Git commands and differences between rebase and merge), and AI agent/tooling concepts (integration protocols vs agent skills, prompt engineering techniques, and practical LLM comparisons). It is commonly asked to verify foundational backend engineering knowledge relevant to content safety and AI integration, falls under the Software Engineering Fundamentals domain for a Backend Engineer, and tests both conceptual understanding and practical application.