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Mock interviews by role · Software & Engineering

Solutions Architect mock interview

Solutions architect interviews test whether you can turn a vague need into a design someone can build, with the trade-off written down. A box diagram with every product logo and no requirement is a weak answer.

Start each prompt by restating the constraint: latency, compliance, team size, or the system you are not allowed to replace.

Practice this role with an AI interviewer

What the loop usually looks like

  1. Screen

    30 min

    A solution you guided from request to build.

  2. Design

    45–60 min

    A scenario with a constraint you must respect.

  3. Influence

    30 min

    Disagreement with engineering, security, or a customer.

What interviewers score

  • Requirements first
  • Trade-offs
  • Fit to the team
  • Clear communication

10 solutions architect interview questions and model answers

  1. Domain

    1. A customer asks for real-time analytics and has one engineer. What do you propose?

    What they are testing: Fit to the team.

    I ask what decision is late if the data is an hour old. If an hour is fine, I propose a scheduled pipeline they can operate. Real-time is a second project they cannot staff. I write that recommendation as a trade-off, not as a lack of ambition.

  2. Technical

    2. How do you choose between extending a system and replacing it?

    What they are testing: Migration judgment.

    I replace it when the change they need is fought by the current design, and the cost of extension is higher than a staged move. Otherwise I extend it. A replacement plan includes how both systems run during the move.

  3. Situational

    3. Security blocks a design the day before a customer demo. What do you do?

    What they are testing: Constraint handling.

    I ask which control failed. If there is a narrower design that passes, I demo that and label the gap. I do not demo a path security has rejected and hope nobody notices.

  4. Behavioral

    4. Tell me about a design you simplified after talking to the people who would run it.

    What they are testing: Listening.

    My first diagram had three new services. The on-call team was two people. We kept one new service and a managed queue. The design was less impressive and more likely to stay up.

  5. Domain

    5. How do you document a decision so it is not relitigated every month?

    What they are testing: Decision records.

    I write the context, the options, the choice, and the trigger that would make us revisit. I keep it with the design, not in a chat thread. New people can disagree by challenging the trigger, not by restarting from zero.

  6. Technical

    6. What do you include in a availability target conversation?

    What they are testing: Non-functional requirements.

    What the user experiences during a failure, how long that may last, and what it costs to go further. A number of nines without a failure story is not a requirement the team can build.

  7. Behavioral

    7. Describe a time a stakeholder wanted a vendor you thought was wrong.

    What they are testing: Influence without dismissal.

    I compared the vendor to the requirement we had written, line by line. Two lines failed. We either changed the requirement in public or picked a different vendor. I did not rely on a private opinion of the brand.

  8. Situational

    8. The estimate comes back far above the budget. How do you redesign?

    What they are testing: Scope.

    I split must-have outcomes from later phases and price them separately. The customer or sponsor picks a phase. I do not quietly drop security or backups to make the number fit.

  9. Domain

    9. How do you run a design review that engineers do not dread?

    What they are testing: Facilitation.

    I send the diagram and the open questions beforehand. In the room I track decisions and owners, and I stop a debate that is not on the decision list. The notes go out the same day.

  10. Technical

    10. How do you handle data residency in a design that started as a single region?

    What they are testing: Compliance as a requirement.

    I ask which data cannot leave the region and which can. Only the restricted data needs a regional store and a clear path. I do not duplicate the entire platform until the requirement says so.

Frequently asked questions

Is this a system design interview?

It is system design plus stakeholders. You will be scored on the requirement and the trade-off, not only on the components you name.

How many options should I present?

Two is usually enough: the one you recommend and the serious alternative, with the reason you did not pick it.

What if I have not held the architect title?

Use a design you influenced. Say what was adopted and what was rejected. Title is less important than the decision.

How do I practice the whiteboard without a whiteboard?

Describe four boxes in order and the constraint on each. A voice mock can still test whether you started from the requirement.

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