Career & interviews · Interview Prep
Software engineer behavioral interview: practice with Kevin Liu
Expect questions about a disagreement over a technical decision, a production incident you owned, a project that failed, a difficult teammate, and your biggest impact. Answer with the STAR shape, say what you did (“I,” not “we”), include numbers such as latency or users affected, and finish with what you learned. Practice with Kevin Liu, a skeptical engineering manager who pushes for stakes and specifics.
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Updated October 2026
Who it's for
Who this practice is for
- Engineers in a job search who have a behavioral loop coming up.
- Bootcamp grads who can code but freeze on ownership questions.
- University CS students prepping for their first real interview.
- Anyone who says we instead of I and needs to fix that fast.
What happens
How a session goes
- Engineering Manager Kevin Liu speaks first and asks you to walk through a disagreement with a technical decision your team made.
- He listens and follows up on what you actually said, pushing for numbers, stakes and your exact role.
- After five or more questions, he gives a hire or no-hire decision for the behavioral loop.
Real lines from a test session
What Engineering Manager Kevin Liu said in a test session
“Walk me through the biggest production incident you were part of. What was your role, exactly?”
“You think you added better tests. Walk me through the tests you wrote. What were the specific edge cases you missed, and what exactly did the new test cover?”
“I'll answer your question first. On my team, technical disagreements get resolved by data and prototyping, not by seniority or volume. If you have a concern, you bring evidence or a quick proof-of-concept.”
From a test session of this practice in the app, lightly trimmed. Your session goes its own way: the character reacts to what you say.
The scorecard
What the scorecard looked like for Software Engineer Behavioral Interview
“I guess I mostly trusted what the senior engineer said, honestly. I was pretty focused on just getting things back up, so I didn't dig into the root cause myself at that moment.”
You admitted to not verifying the root cause during a production outage, which hurt your ownership score.
Try instead: “I immediately pulled the Git history on the last config change, saw a typo in the database connection string—the senior confirmed—and I led the rollback. The downtime was 14 minutes.”
What went well: When pushed, you gave concrete edge cases (null and empty string) and the fix (new unit test pass) without hedging.
Real scorecard output from one of our test runs. In test runs the practice answers are written by a test script, not by a customer.
What good looks like
What a strong answer does here
- You give concrete stakes and numbers: time saved, users affected, cost avoided.
- You say I did this, not we, and name your exact part in the work.
- You show conflict resolved with data or a quick prototype, not volume or seniority.
- You end with what you learned and how you changed your approach next time.
Scored on:
- Clarity
- Relevance
- Evidence
- Structure
Common mistakes
Weak lines, and what to say instead
Weak: “We disagreed about the database choice, but it worked out in the end.”
Better: “I disagreed with our database choice. I built a small prototype showing our query times were three times slower, and we switched.”
It names your role, the conflict and the data that settled it.
Weak: “We improved performance a lot after the incident.”
Better: “I owned the incident review, found the missing edge case, and added a test that cut similar failures by half.”
Vague we improved tells the interviewer nothing about your impact.
Weak: “My teammate made the wrong call and it caused the outage.”
Better: “The team chose an approach I had concerns about. I raised them with a small test, and we adjusted before the release.”
Blaming teammates is penalized; show how you resolved it.
Weak: “I learned that communication is important.”
Better: “I learned to bring a quick proof-of-concept to technical debates instead of arguing from opinion.”
A specific lesson shows growth and fits what the scorer rewards.
Software Engineer Behavioral Interview: start talking in a few seconds. Your own side stays yours to fill in.
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Your interview prep practice plan
- Connect your experience to the role
- Explain your own action and result
- Handle a follow-up with specific evidence
Start with a free worksheet, then test your own response with a voice or text roleplay. Your first complete coaching report is free once across all areas. Create a free account to save your goal, actual words, and downloadable notes.
Need repeated practice? $4.99 once buys 100 rounds across every mode and full coaching on every report. Rounds never expire; no subscription is required.
FAQ
Questions about Software Engineer Behavioral Interview
Who will I be talking to in this practice?
You talk to Engineering Manager Kevin Liu, a skeptical engineering manager about 40 years old. He appears as a 3D face whose voice matches it. He speaks first, asks behavioral questions one at a time, and follows up on what you actually said. He plays the stress interviewer, so expect pushback. Try it free →
How does the session end?
After five or more questions, Kevin gives a hire or no-hire call for the behavioral round, the way an interviewer would write it up afterward. Hearing why helps: it usually comes down to whether your stories showed ownership, numbers and what you learned. Try it free →
What does the scorer look for in my answers?
It rewards concrete stakes and numbers, your own role using I instead of we, conflict resolved with data, and what you learned. It penalizes blaming teammates and vague lines like we improved performance. The four scored dimensions are Clarity, Relevance, Evidence and Structure. Try it free →
How do I prepare for a software engineer behavioral interview?
Write six to eight short stories from your work (a conflict, an incident, a failure, a big win, mentoring, a tight deadline) and practice telling each in about two minutes with the STAR shape and real numbers. Most questions can be answered with one of those stories. Try it free →
Try Software Engineer Behavioral Interview free
4 free rounds now, no signup. 7 with a free account. Then $4.99 for 100 rounds, one time, with no subscription. Plans are there if you practice every day.
Try it free, no signupBuilt by Matthew, a solo founder. Questions? Email support@getadversaryai.com, I read every message.