Real-World Design and Architecture Scenarios Interview Questions | OOPS | NextRound

1Design a simple Logger class. Should it be Static, Singleton, or injected via Interface? Justify.Advanced

2How would you design a system for a Car that has different engine types (Petrol, Diesel, Electric)? Show the OOP model.Intermediate

3How would you model a Bird class? What issues arise when you try to add a Penguin or Ostrich? (LSP violation)Advanced

4You have a class that validates user input. The validation rules change frequently. Which pattern would you use and why?Advanced

5How do you design an Undo/Redo functionality? (Command Pattern)Advanced

6How would you design a Plugin Architecture?Advanced

7How do you handle Cross-Cutting Concerns (Logging, Caching, Authentication) without polluting business logic? (AOP/Proxy/Decorator)Advanced

8You need to cache data. Some data expires in 1 minute, some in 1 hour. How do you design this using OOP?Intermediate

9How would you design a Payment Gateway integration that supports multiple providers (PayPal, Stripe)?Advanced

10What is the Anemic Domain Model? Why is it considered an anti-pattern by many?Advanced

11What is Domain-Driven Design (DDD) in a nutshell? How does it relate to OOP?Advanced