Software engineer interviews test more than coding speed. Interviewers want to understand how you reason, communicate, debug, design, and collaborate. Use these questions to prepare for technical screens, project deep dives, and final rounds.
Technical fundamentals
- Explain the difference between an array, linked list, stack, and queue.
- How would you detect a cycle in a linked list or graph?
- What is the difference between BFS and DFS?
- How do hash maps work internally?
- What are common causes of high time complexity in a solution?
- How would you test edge cases for your algorithm?
Backend and architecture questions
- How does authentication with access tokens and refresh tokens work?
- What is database indexing and when can it hurt performance?
- How would you design an API for pagination and filtering?
- What is caching and how do you handle cache invalidation?
- How would you make a service more reliable under traffic spikes?
Project deep-dive questions
- Walk me through the most complex project you built.
- What trade-off did you make and why?
- How did you measure whether the project was successful?
- What would you change if you built it again?
- How did you debug the hardest issue in that project?
How to practice
Practice answering out loud. A correct idea can still fail if it sounds scattered. MockFlux helps you practice technical explanations, project stories, and follow-up questions with structured AI feedback.