A critical application contains tightly coupled legacy code with minimal documentation. Explain how you would safely refactor the system while minimizing produc

An API serving millions of daily requests requires improved scalability and fault tolerance. Describe your architecture, caching strategy, and monitoring approa

A web application currently uses password-only authentication. Explain how you would redesign the authentication system to improve security while maintaining us

A cloud-based application experiences increased response times after scaling to multiple microservices. Identify potential bottlenecks and propose optimization