Asynchronous APIs (async/await) ASP.NET Core supports full async/await pattern for IO-bound tasks. [HttpGet] public async Task<ActionResult<Product>> GetAsync(int id) { var product = await _repo.GetAsync(id); return product == null ?

Short answer: NotFound() : Ok(product); ✅ Improves scalability and performance. NotFound() : Ok(product); ✅ Improves scalability and performance. NotFound() : Ok(product); ✅ Improves scalability and performance. NotFound() : Ok(product); ✅ Improves scalability and performance.

Real-world example (ShopNest)

A ShopNest checkout request flows through middleware, hits a minimal API or controller, uses scoped services, and returns ProblemDetails on errors.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.