System Design Deep Dive: Past Project End-to-End
Provide a detailed, end-to-end walkthrough of a significant technical project you led or contributed to.
Include the following:
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Problem statement, target scale, and key constraints
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Your role and team composition
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Key architectural choices and trade-offs (and rejected alternatives)
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Data storage and schema design
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External and internal interfaces (APIs, contracts, SLAs)
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Deployment topology (regions, AZs, scaling model)
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Reliability strategies (fault tolerance, backpressure, failover, data integrity)
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Observability (metrics, logs, tracing, SLOs, alerting)
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Performance bottlenecks and how you diagnosed and fixed them
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Measurable outcomes (latency, availability, cost, throughput, accuracy)
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What went well, what failed, and lessons learned
Keep your answer structured with headings and concrete details (numbers, SLAs, volumes, diagrams-in-words).