What are common pitfalls when implementing DI?

Short answer: Over-injection (too many dependencies in one class – violates SRP) Service locator anti-pattern Incorrect lifetimes, leading to memory leaks or unintended reuse Tight coupling to the DI container (e.g., using container APIs in business logic) Circular dependencies due to poor design Registering services in the wrong order or not at all

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.