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LessRounds

An AI interviewer that holds the first interview with each job applicant. You share it as a link. Fewer rounds. Better hires.

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Bengaluru, India

  1. Home
  2. Screening questions
  3. Software engineer

Engineering and data

Screening questions for software engineers.

A first interview with an engineer should answer three questions. Did this person really build what’s on their résumé? Can they think through a problem out loud? Do they make sensible trade-offs, giving up one thing to get another? It doesn’t replace your technical interview. It tells you who should get one.

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Scorecard · Software engineer
  • Depth on past work · Intermediate30%
  • Debugging approach · Intermediate25%
  • Trade-off judgment · Intermediate25%
  • Explaining technical work · Intermediate20%
Interview
Video, AI-led
Length
About 25 minutes
Language
English

The AI asks follow-up questions that go past a rehearsed summary, into details only someone who did the work would know.

What to look for

What the first interview should tell you.

Depth on past work
Anyone can list the tools they’ve used. Only someone who built a system can explain why it was built that way.
Debugging approach
Most engineering time goes into finding out why something doesn’t work. A clear method works better than luck.
Trade-off judgment
Every design gives something up. Good engineers can say what they gave up and why it was worth it.
Explaining technical work
Engineers write design documents, review each other’s code and talk to product managers. People who think clearly usually explain clearly.

The questions

8 questions, and how to judge the answers.

Ask them in order. Listen for real details: what happened, what the candidate did, and how it ended.

  1. 01

    Walk me through something you built recently that you’re proud of. What was the hardest decision in it?

    Strong answer

    Explains the problem before the tools, separates their own part from the team’s, and names one decision and what it cost.

    Weak answer

    Lists technologies, says “we” all the way through, and can’t say what they did themselves.

  2. 02

    Tell me about the hardest bug you’ve tracked down. How did you find it?

    Strong answer

    Made a guess about the cause, then narrowed it down with logs, a reliable way to make the bug happen, or by testing older versions one by one. Found the root cause and changed something so it couldn’t happen again.

    Weak answer

    “I found it eventually”, or the fix was a restart and they never learned the cause.

  3. 03

    Tell me about a time you chose the simpler option over the better-engineered one. Was it the right call?

    Strong answer

    Names the limit they were working under, like a deadline or a small team, says what they gave up, and looks back on it honestly.

    Weak answer

    Always picked the most complex option, or can’t name a single trade-off they’ve made.

  4. 04

    Tell me about a time something you released broke for real users. What happened, and what did you do in the first hour?

    Strong answer

    Stopped the damage first, by going back to the last working version or switching the feature off. Kept people informed, then found the cause and wrote up what would change.

    Weak answer

    Blames the testers or another team, or spent the hour hunting the bug while users were still stuck.

  5. 05

    How would you build a feature that emails each user a report every week? Talk me through how you’d approach it.

    Strong answer

    Asks about time zones, how many users there are, and what happens when an email fails to send. Then breaks it into parts: storing each user’s schedule, a background job that sends the emails, retrying failures, and alerts when something goes wrong.

    Weak answer

    Jumps straight to a specific tool without asking anything, or can’t break the problem into pieces.

  6. 06

    Tell me about a code review where you disagreed with the other person. How did it end?

    Strong answer

    Argued with reasons, stayed open to being wrong, and can tell a real problem from a personal preference that’s worth letting go.

    Weak answer

    Always gives in to avoid friction, or tells it as a story about winning.

  7. 07

    How do you decide what to test, and what not to?

    Strong answer

    Tests the parts where a failure is most likely or would cost the most, and gives an example of something they chose not to test, and why.

    Weak answer

    “I test every line”, or “we never had time for tests”, with no view of their own.

  8. 08

    What’s something you learned in the last year that changed how you write code?

    Strong answer

    Names a specific idea or practice and describes code they wrote differently because of it.

    Weak answer

    Names a new tool they’ve read about but can’t say what changed in their work.

Before the interview

Screening questions

  • Which programming languages have you used in live products in the last two years? (Short text)
  • What is your notice period? (Short text)
  • Upload your résumé (PDF)

Short form questions the candidate answers before the interview. You read the answers next to the interview. They aren’t scored.

Listen for

Red flags

  • Can’t separate their own contribution from the team’s, even when asked directly.
  • Describes every past decision as obviously right, with no trade-offs.
  • Blames other teams, or talks down about people who aren’t engineers, in most stories.

Avoid

Common mistakes

  • Asking quiz questions about definitions, which test memory instead of judgment.
  • Skipping the technical interview because the first interview went well.
  • Giving more credit for confident technical terms than for what the candidate actually explained.

Use this in LessRounds

Turn this page into an interview.

Paste the questions into a scripted interview, where the AI reads each question word for word. Add the skills from the scorecard, then share one link. Every software engineer candidate gets the same questions. You get a score for each skill, with the candidate’s own words that explain it.

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Questions

Can a spoken first interview replace a technical interview?

No. It checks whether someone can think through real work and explain their decisions. It doesn’t check whether their code meets your standard. Use it to decide who gets your take-home task, or a session writing code alongside one of your engineers.

How do I tell a senior engineer from a mid-level one in a first interview?

Listen for how big the work was and how many people it involved. Senior engineers talk about why a problem was worth solving, what they chose not to build, and how they got others on board. Mid-level engineers tend to describe the building work itself.

Related roles

  • Frontend developerEight questions for a first interview with frontend developers, on interface work, browser bugs and accessibility, with strong and weak answers and a scorecard.
  • Data analystEight questions for a first interview with data analysts, on framing questions, checking data and explaining findings, with strong and weak answers.
  • Technical support specialistEight questions for a first interview with technical support specialists: finding causes, passing issues to engineers and explaining simply.

Try LessRounds free today.

Start with 100 free credits, enough for about 20 interviews. No credit card or sales call needed.

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