Deep-dive your recent project architecture
Company: TikTok
Role: Software Engineer
Category: System Design
Difficulty: hard
Interview Round: Technical Screen
Walk through the architecture of your most recent project end-to-end: core components, data model, external dependencies, and deployment topology. Explain key design decisions, trade-offs, and constraints (latency, throughput, cost). Describe failure modes you encountered, how you detected/mitigated them, and what you would redesign if given another chance. Include concrete metrics and incidents to demonstrate impact.
Quick Answer: This question evaluates a candidate's ability to describe end-to-end system architecture, justify design decisions and trade-offs, and demonstrate competencies in data modeling, storage strategies, deployment topology, scalability, consistency models, observability, and incident management.