Backend Developer

Real interview questions with expert answers, plain-English explanations, and practical examples. (7 questions)

PayPal Backend Developer Message Queues

How do message queues ensure reliable delivery and what are the tradeoffs of at-least-once vs exactly-once processing?

Read answer →
Netflix Backend Developer Caching

When would you use different caching strategies like write-through or write-back, and how do you handle cache invalidation?

Read answer →
Microsoft Backend Developer API Design

How do you design an idempotent API endpoint, and why does it matter for payment retries?

Read answer →
Adobe Backend Developer Concurrency

Explain a race condition and how a mutex actually prevents it, with a concrete example.

Read answer →
Meta Backend Developer System Design

How would you design a rate limiter for an API, and how do token bucket and sliding window actually differ?

Read answer →
Capgemini Backend Developer Databases

Explain database normalization, and when would you deliberately denormalize a production table?

Read answer →
Deloitte Backend Developer API Design

What makes an API RESTful, and how is that different from SOAP?

Read answer →