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Aporeon

Technical interview practice, from one developer to another.

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Comparison questionMedium~8 min

Choose between a GC dump and a full process dump

Chooses heap-focused GC evidence or complete process state based on memory growth, roots, hangs, crashes, locks, and collection risk.

Comparison questionEasy~6 min

Choose the right .NET diagnostic evidence from a symptom

Chooses counters, traces, stack snapshots, GC dumps, full dumps, or a profiler from the production symptom and investigation cost.

.NET

Practice drill

Architecture scenarioHard~10 min

Collect .NET diagnostics safely in production

Designs controlled diagnostic access, collection triggers, container permissions, artifact egress, privacy, retention, and post-capture verification.

Debugging scenarioMedium~8 min

Diagnose high CPU with dotnet-trace

Collects a bounded EventPipe CPU trace and reads stack evidence without confusing hot methods, blocked time, native work, or sampling artifacts.

Debugging scenarioHard~10 min

Prove ThreadPool starvation with counters, stacks, and traces

Combines ThreadPool counters, repeated stack snapshots, and wait-event traces to distinguish blocked workers from CPU or dependency pressure.

.NETASP.NET Core

Debugging scenarioEasy~7 min

Triage a .NET service with dotnet-counters

Uses live runtime and application counters to classify CPU, memory, GC, exception, request, and ThreadPool symptoms before deeper collection.

.NETASP.NET Core