Deep-dive your recent project architecture

Q: Deep-dive your recent project architecture

This is a System Design interview question from TikTok for Software Engineer roles. View the full question and solution on PracHub.

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Question

End-to-End Project Architecture Walkthrough (Technical System Design)

Provide a structured walkthrough of a recent system you built or led. Cover both the "what" (architecture) and the "why" (design decisions and trade-offs).

What to Include

System overview and goals
Core components and end-to-end data flow
Data model and storage strategy
External dependencies (e.g., queues, caches, databases, third-party services)
Deployment topology (regions/AZs, containers/VMs, autoscaling, networking)
Key design decisions, trade-offs, and constraints (latency, throughput, cost)
Failure modes you encountered, how you detected them, and mitigations
What you would redesign if you had another iteration
Concrete metrics and incidents (latency percentiles, QPS, error rates, costs, outcomes)

Be specific about SLIs/SLOs, budgets for latency, partitioning/sharding, consistency model, and how you validated impact (A/B testing, canaries, rollbacks).

Deep-dive your recent project architecture

End-to-End Project Architecture Walkthrough (Technical System Design)

What to Include

Solution (Locked)

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