Senior
Span<T> and Memory<T> Interview Questions for Senior .NET Developers
Senior .NET interview questions on Span<T> and Memory<T>: ref struct rules, stackalloc safety, ArrayPool pooling, allocation-free parsing and review pitfalls.
Memory & Performance
Memory and performance interview questions for senior .NET engineers: Span<T>, allocations, memory leaks, profiling, benchmarking, collections, JSON and caching.
9 interview guides · 90 questions with detailed answers
Performance questions test whether you can find and fix real bottlenecks under pressure. Expect scenario-based questions: a service whose memory grows until it restarts, p99 latency spikes during garbage collections, or a hot path that allocates too much.
These pages cover the tools, techniques and mental models you need to answer them convincingly.
Senior
Allocation Reduction and Object Pooling Interview Questions
Senior .NET interview questions on cutting allocations: ArrayPool, ObjectPool, RecyclableMemoryStream, string.Create, hidden boxing, closures and LINQ costs.
Lead
Memory Leak Diagnosis Interview Questions for .NET Engineers
Lead-level .NET interview questions on diagnosing memory leaks: counters, gcdump, SOS dumpheap and gcroot, unmanaged leaks, fixes and regression monitoring.
Senior
Performance Profiling Interview Questions for .NET Developers
Senior .NET interview questions on performance profiling: sampling vs instrumentation, dotnet-trace, PerfView, flame graphs, lock contention and starvation.
Senior
Benchmarking and BenchmarkDotNet Interview Questions
Senior .NET interview questions on BenchmarkDotNet and load testing: microbenchmark design, statistics, CI benchmarks, k6, NBomber and p50/p95/p99 latency.
Architect
High-Throughput .NET Services Interview Questions
Architect-level interview questions on Kestrel tuning, async I/O, System.IO.Pipelines, pooling, backpressure, Server GC with DATAS and tail latency.
Senior
Collections Internals Interview Questions for .NET Developers
Senior-level interview questions on Dictionary and HashSet internals, List growth, ConcurrentDictionary, frozen and immutable collections and presizing.
Senior
JSON Serialization Performance Interview Questions in .NET
Senior .NET interview questions on System.Text.Json vs Newtonsoft.Json, source generation, polymorphic types, streaming and untrusted-input security.
Architect
Caching Strategies Interview Questions for .NET Architects
Architect interview questions on cache-aside vs write-through, stampede prevention, HybridCache, TTL design, cache keys and Redis failure modes.
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