QA Hub

Clear answers to common questions.

How to design a rate limiter

· System Design

Understand token bucket, sliding window, and distributed rate limiting algorithms and their trade-offs.

What Is Cloud Computing

· Tech Fundamentals

Explore on-demand computing resources, scalability, and the shift from on-premise to cloud infrastructure.

What is MVCC in PostgreSQL

· SQL & Databases

Understand Multi-Version Concurrency Control and how PostgreSQL handles concurrent reads and writes without locking.

What is distributed tracing?

· DevOps & CI/CD

Distributed tracing tracks requests across microservices. Learn how tools like Jaeger and Zipkin improve latency debugging.