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Aporeon

Technical interview practice, from one developer to another.

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System designHard~20 min

Design a backend for large report exports

Designs an async export flow for large reports without blocking API requests or exhausting database and memory resources.

.NETApplication InsightsASP.NET CoreAzure Service BusSQL Server

System designMedium

~16 min

Design a business workflow state machine

Designs explicit workflow states, allowed transitions, guard rules, audit history, idempotency, and operational repair paths.

.NETApplication InsightsASP.NET CoreAzure Service BusSQL Server

Practice drill

System designHard~20 min

Design an idempotent checkout backend

Designs a checkout or order creation flow that survives client retries without duplicate orders, payments, or messages.

.NETApplication InsightsASP.NET CoreAzure Service BusSQL Server

System designMedium~16 min

Design a notification system for a .NET backend

Designs email, in-app, and push-style notification delivery with preferences, retries, and idempotent side effects.

.NETApplication InsightsASP.NET CoreAzure Service BusSQL Server

System designHard~20 min

Design a reliable third-party integration sync

Designs synchronization with an external system using cursors, retries, idempotency, rate limits, and reconciliation.

.NETApplication InsightsASP.NET CoreAzure Service BusSQL Server

System designHard~20 min

Design a saga and compensating workflow

Designs a multi-service business workflow using local transactions, durable progress, idempotency, retries, and domain-specific compensation.

.NETASP.NET CoreAzure Service BusSQL Server

System designHard~20 min

Design a webhook ingestion system

Designs authenticated, replay-resistant webhook intake with durable acknowledgement, idempotent asynchronous processing, ordering policy, and reconciliation.

.NETApplication InsightsASP.NET CoreAzure Service BusSQL Server

System designHard~20 min

Design bulk import preview and validation

Designs a safe admin import flow with upload staging, validation, preview, confirmation, idempotency, and rollback strategy.

.NETApplication InsightsASP.NET CoreAzure Service BusSQL Server

System designMedium~16 min

Design notification preferences and digests

Designs user preferences, channel rules, unsubscribe behavior, digest generation, and delivery suppression.

.NETApplication InsightsASP.NET CoreAzure Service BusSQL Server

System designMedium~16 min

Design recurring background jobs in a backend system

Designs scheduled jobs with locking, idempotency, observability, retries, and safe operations across multiple instances.

.NETApplication InsightsASP.NET CoreAzure Service BusSQL Server

System designMedium~16 min

Design saved searches and alerts

Designs saved filters, scheduled matching, alert delivery, and freshness trade-offs for search-driven product workflows.

.NETApplication InsightsASP.NET CoreAzure Service BusElasticsearch+1

Coding problemMedium~25 min

Handle downstream timeout and cancellation

Separates caller cancellation from a dependency timeout and maps expected downstream outcomes safely.

.NETASP.NET CoreC#

Architecture scenarioHard~12 min

Reconcile an ambiguous distributed workflow

Repairs a workflow when a remote operation may have succeeded but local state, messages, and callbacks disagree.

.NETASP.NET CoreAzure Service BusSQL Server

Coding problemMedium~25 min

Return 202 for a durable background job

Persists a job and outbox command before returning a status URL for long-running work.

.NETASP.NET CoreC#EF Core

Comparison questionMedium~7 min

Synchronous vs asynchronous service communication

Selects synchronous calls, asynchronous messaging, or a deliberate combination based on user feedback, coupling, latency, durability, and failure behavior.

.NETASP.NET CoreAzure Service Bus