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Additional Topics Interview Questions — What Senior Engineers Need to Know

Senior engineering interviews often include questions that don’t fit neatly into one domain. These cross-cutting topics — testing strategies, API design principles, observability, and deployment practices — test whether you think holistically about building and maintaining production systems.

These 13 questions cover the engineering judgment that interviewers value most: knowing when to choose different testing approaches, how to design APIs that evolve gracefully, and what monitoring matters in production. The kind of knowledge that comes from actually running systems, not just building them.

All 13 Questions

CAP theoremExplain the CAP theorem and its practical implications.SQL vs NoSQLWhat are the differences between SQL and NoSQL databases?Big O basicsWhat is Big O notation and what are the common complexities?N+1 problemWhat is the N+1 query problem and how do you fix it?AI tools in workflowHow do you use AI tools effectively in your development workflow?Redis InternalsHow does Redis work internally?Class vs Interface / ABCWhat is the difference between a class and an interface/ABC in Python?ShadowingWhat is variable shadowing and why is it problematic?asyncio vs threading vs multiprocessingWhat is the difference between asyncio, threading, and multiprocessing in Python?asyncio.SemaphoreWhat is asyncio.Semaphore and when would you use it?Inheritance vs CompositionWhen should you use inheritance vs composition?Browser CachingHow does browser caching work?Method signatureWhat defines a method signature and why does it matter?

How to Prepare

Focus on understanding concepts deeply enough to explain them in your own words. For each topic, practice articulating the trade-offs and real-world applications — interviewers care about practical judgment, not textbook definitions.

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