Software Engineer interview questions, and what they're really asking

Software engineering interviews mix behavioural questions with system design and debugging. Interviewers want evidence that you can ship reliable code, reason about trade-offs, and work well in a team. Below are the questions you're most likely to face and what a strong answer shows. When you're ready, rehearse them in the Interview Lab with questions built from your job ad.

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Top 6 software engineer interview questions

  1. Walk me through a system you designed. What trade-offs did you make?

    What they're looking for
    Clear architecture, explicit trade-offs (consistency vs latency, build vs buy), and what you would change now.

  2. Tell me about a production incident you handled.

    What they're looking for
    Calm triage, root-cause analysis, communication during the incident, and follow-up fixes that prevent it happening again.

  3. How do you make sure your code is maintainable?

    What they're looking for
    Testing strategy, code review habits, naming and documentation, and refactoring with intent.

  4. Describe a time you disagreed with a technical decision.

    What they're looking for
    Disagreeing with data, respecting the final decision, and the outcome.

  5. How would you design a URL shortener that handles 10,000 requests per second?

    What they're looking for
    Requirements first, then storage and ID generation, caching, scaling reads, and failure modes.

  6. What's something you learned recently and applied at work?

    What they're looking for
    Curiosity, plus the gap between learning something and actually using it.

Reading questions isn't the same as answering them

Most candidates know the questions and still freeze on the day. In the Interview Lab, an AI hiring manager asks questions written from the real job ad and your CV. You answer by voice or text and get a scored report with a stronger version of every answer.

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Frequently asked questions

How should I prepare for a software engineer interview?

Study the job ad, prepare STAR stories for the competencies it lists, rehearse answers out loud, and do a mock interview. The Interview Lab generates software engineer questions from the actual ad and scores your answers.

How long should my answers be?

Roughly 1 to 2 minutes for behavioural questions. Technical questions can run longer if you walk through your reasoning.

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