Behavioral interview practice: Your story sounds good. Until the follow-up.
Practice behavioral interviews out loud with an AI mock interviewer. MockRun follows up on what you actually said and shows what you left out.
One question, with follow-ups.
Sign in with your tester invitation.
Built by a former AWS hiring manager.
Independent, and not affiliated with Amazon.
Illustrative example
Interviewer: Give me an example of a complex problem you solved with a simple solution.
- Interviewer
Give me an example of a complex problem you solved with a simple solution.
- You, out loud
We replaced six manual sign-offs with automated checks and cut release time from six weeks to three.
- Follow-up, from your words
You said “we replaced” them. Which part of that did you do?
- Interviewer's notes
The result is clear. Next time, say what you did yourself.
- You, out loud
The answers and feedback are fictional. In your debrief, these notes explain what your own answer covered and what to add.
You leave knowing what to fix.
Practice behavioral interview questions one at a time, with follow-ups and written feedback.
- One question from a bank of 128
- You answer out loud or type, if you choose to
- Follow-ups on what you said one at a time
- Your debrief what you covered, what to practice next
Sample debrief
Overall feedback
Important evidence is missing
Your contribution and result are clear. Explain why you chose automated checks over other options.
Give me an example of a complex problem you solved with a simple solution.
What this question is looking for
Explain the problem you simplified, how you chose your solution, and what showed it worked.
What worked
You identified the checks you wrote yourself and explained how you ran them alongside the manual process.
What to explain next
The missing comparison would show how you weighed the options.
Name one option you ruled out before automating, and why.
Your answer, for reference
- You, out loud: We replaced six manual sign-offs with automated checks and cut release time from six weeks to three.
- Follow-up: You said “we replaced” them. Which part of that did you do?
- You: I wrote the first two checks myself and ran them beside the sign-offs for a month.
Details mentioned and still missing
- Situation: The problem and what made it complex · needs detail
“six manual sign-offs”
- Task: Your role in solving it · covered
“I wrote the first two checks myself”
- Action: The simple solution and how you reached it · needs detail
- Action: Alternatives you considered · not yet shown
- Result: Evidence it worked · covered
“from six weeks to three”
- Improvement: What you learned or would change · not yet shown
Built on Amazon's Leadership Principles.
Amazon publishes 16 principles and interviews against them, one behavioral question at a time. MockRun's 128 questions are grouped the same way. Other companies ask about the same things under their own names.
- Customer Obsession
- Ownership
- Invent and Simplify
- Are Right, A Lot
- Learn and Be Curious
- Hire and Develop the Best
- Insist on the Highest Standards
- Think Big
- Bias for Action
- Frugality
- Earn Trust
- Dive Deep
- Have Backbone; Disagree and Commit
- Deliver Results
- Strive to be Earth's Best Employer (rarely asked)
- Success and Scale Bring Broad Responsibility (rarely asked)
Added in 2021 and rarely asked in interviews. Sessions leave them out unless you pick them.
Read all 16 principlesWhy it's built around the follow-up.
MockRun was built by a former AWS hiring manager.
In a behavioral interview, the first answer is where the questions start. The interviewer keeps asking until three things are clear, and those follow-ups are the hardest part to rehearse on your own.
So MockRun asks them: one at a time, about the story you just told, then writes down what your answer showed and what it didn't.
- What did you do yourself?
- How do you know it worked?
- What else did you weigh?
Behavioral interview guides.
How to structure a story, how long to talk, which follow-ups to expect and what useful feedback looks like. Each guide has a worked example.
The STAR interview method
Keep the setup short and spend most of the answer on what you did and why.
Amazon interview story length
Day One Careers recommends 5–9 minutes for an opening story, with room for follow-ups.
Follow-up questions
What interviewers ask after your first answer, and how to rehearse for it.
Disagree and commit example
Show the challenge and the commitment, and make sure the story fits the exact question.
Behavioral interview feedback
Feedback you can act on points to your own words and names one thing to fix.
Preparing your stories
Choose true examples at the scope of the role, then rehearse them aloud.
Before you start.
Do I need an account?
Yes, practice is currently available to invited testers. Sign in with your approved email, then choose a track and level. You can read the interview guides without an account.
Do I have to answer out loud?
Speaking is the default, because a real interview is spoken, and your browser asks for microphone access when you start. You can choose typing in setup, and setup tells you before you start if voice is unavailable. If voice stops partway through, you can continue by typing.
What if I don't know STAR?
STAR stands for Situation, Task, Action and Result. MockRun uses STARI, which adds Improvement for what you learned or would change. In guided practice, the default, a short guide and an example help you explain how you acted and why.
How long does a session take?
Allow about 10 minutes per question, including follow-ups, so three questions take roughly 30 minutes. Aim for 5–9 minutes on your story; we’ll help you wrap up around the 10-minute mark without cutting you off. You can finish early and still get feedback.
What kind of follow-up questions does MockRun ask?
Questions about the story you just told, one at a time, such as what you did yourself and how you know it worked. MockRun reads your whole answer first, so its probes focus on details that are still missing.
What if my example doesn't fit the question?
MockRun compares your story with the situation the question asks about. If they seem to differ, the interviewer can ask you to clarify or choose another example, and the debrief notes how well it fit.
What does the feedback show?
STARI notes, behavioral observations quoted from your own words, whether your example fit the question, and a specific detail to practice next. When every planned answer is complete and has enough evidence to assess, you also get a practice verdict based on MockRun’s coaching rubric; it does not predict an employer’s decision.
Can I prepare my stories before practicing?
Yes. The optional story library keeps notes on your role, decisions, results and anything you are unsure of. The notes stay in your browser and are not sent to the interviewer.
Is MockRun only for Amazon interviews?
No. The questions are grouped by Amazon's Leadership Principles, but they ask about ownership, conflict, results and judgment, which other companies' behavioral interviews cover too. MockRun is independent and not affiliated with or endorsed by Amazon.
Try the follow-up now.
One question, with follow-ups. Sign in with your tester invitation.