Explain how Span<T> and Memory<T> help to reduce memory allocations and improve performance. Discuss scenarios for their use, such as parsing and string manipulation.
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Explain the problems with new HttpClient() (socket exhaustion) and how HttpClientFactory solves them. Discuss how to use it to configure named or typed clients and integrate it with Polly for resilience patterns (Retry, Circuit Breaker).
Compare and contrast the use of EF Core's in-memory provider with using a real database in a Docker container (via Testcontainers) for integration testing. Discuss the trade-offs in terms of speed, fidelity, and complexity.
Explain how IAsyncEnumerable allows for efficient, non-blocking iteration over asynchronous data streams. Contrast this with returning a Task<IEnumerable<T>>.
Describe your philosophy on mentoring junior and mid-level engineers. How do you handle code review feedback? How do you foster a culture of technical excellence and continuous improvement on your team?
Define technical debt and provide examples. Discuss a strategic approach for identifying, prioritizing, and paying down technical debt in a large codebase without halting feature development.
Understand the trade-offs vs. arrays. Be proficient in manipulating pointers. Master patterns like the Fast & Slow Pointer technique for cycle detection and finding the middle element.
Explore the differences between document, key-value, columnar, and graph databases, and discuss consistency models like eventual consistency.