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Aporeon

Technical interview practice, from one developer to another.

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Backend System Design Foundation

Distributed System Foundations

Requirements, service boundaries, consistency, communication, replication, partitioning, and multi-service workflows.

7 drillsPractice one at a timeOrdered pathArchitecture scenarioComparison questionSystem design

Recommended start

Requirements & Capacity

Frames a vague system-design problem with explicit flows, constraints, scale estimates, and measurable quality targets before selecting components.

Medium~10 minStep 1 of 7

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1Requirements & CapacityRecommended startFrames a vague system-design problem with explicit flows, constraints, scale estimates, and measurable quality targets before selecting components.Architecture scenarioMedium~10 min.NETASP.NET CorePractice 2Monolith vs MicroservicesChooses between a modular monolith and microservices using domain boundaries, team ownership, scaling, deployment, data consistency, and operational cost.Comparison questionMedium~7 min.NETASP.NET CoreSQL ServerPractice 3Sync vs Async BoundariesSelects synchronous calls, asynchronous messaging, or a deliberate combination based on user feedback, coupling, latency, durability, and failure behavior.Comparison questionMedium~7 min.NETASP.NET CoreAzure Service BusPractice 4Consistency Trade-offsMaps business invariants and stale-data tolerance to strong or eventual consistency, explicit failure behavior, reconciliation, and user-visible state.Architecture scenarioHard~12 min.NETASP.NET CoreSQL ServerPractice 5Read Replicas & LagUses read replicas selectively while accounting for stale reads, read-after-write behavior, routing, failover, query cost, and replication health.Architecture scenarioMedium~10 min.NETASP.NET CoreSQL ServerPractice 6Partitioning & ShardingDesigns a sharding strategy with a stable key, balanced load, routing, resharding, cross-shard limits, and operational ownership.System designHard~20 min.NETASP.NET CoreSQL ServerPractice 7Sagas & CompensationDesigns a multi-service business workflow using local transactions, durable progress, idempotency, retries, and domain-specific compensation.System designHard~20 min.NETASP.NET CoreAzure Service BusPractice

Practice order

7 drillsOne at a time

1Requirements & CapacityUp next / Medium / ~10 min
2Monolith vs MicroservicesMedium / ~7 min
3Sync vs Async BoundariesMedium / ~7 min
4Consistency Trade-offsHard / ~12 min
5Read Replicas & LagMedium / ~10 min
6Partitioning & ShardingHard / ~20 min
7Sagas & CompensationHard / ~20 min