Solutions Architect interview questions, with worked answers

How to use these questions

Most rounds include a design exercise. Ask questions before you draw: who uses it, how many, what may never be lost, what it may cost. Then sketch a simple design, say what you assumed and improve it when the interviewer changes a fact. In the other questions, give a solution you really designed, the choice you made and what it led to.

What a solutions architect is expected to know

• The craft: solution architectureAsked in 28% of solutions architect ads (as of 5 Nov 2026).Turn a business need into a design that fits the systems around it, and defend each choice., from requirements to a recorded decision.
• The cloud: cloud architectureAsked in 5% of solutions architect ads (as of 5 Nov 2026).Design for the cloud with its services, limits and costs, not a data centre moved as it is. on at least one of AWSAsked in 22% of solutions architect ads (as of 5 Nov 2026).Know the main AWS services well enough to pick, combine and price them for a design., AzureAsked in 19% of solutions architect ads (as of 5 Nov 2026).Know the main Azure services well enough to pick, combine and price them for a design. or Google CloudAsked in 16% of solutions architect ads (as of 5 Nov 2026).Know the main Google Cloud services and when they suit a design better than another choice..
• The connections: integrationAsked in 1% of solutions architect ads (as of 5 Nov 2026).Connect systems through APIs, events and files so that each can change without breaking the others. through APIsAsked in 6% of solutions architect ads (as of 5 Nov 2026).Design and review the interfaces between systems: contracts, versions, errors and security., events and files, and when servicesAsked in 6% of solutions architect ads (as of 5 Nov 2026).Know when to split a system into services and what that costs in operation and testing. are worth their cost.
• The people: stakeholdersAsked in 7% of solutions architect ads (as of 5 Nov 2026).Bring business owners, engineers, security and suppliers to one design they all accept. who want different things, and explainingAsked in 21% of solutions architect ads (as of 5 Nov 2026).Explain a design to an executive in five minutes and to an engineer in full detail. a design to each of them.

The diagram tools are named in ads side by side and none is a must: draw.io, Lucidchart, Visio and Archi draw the pictures, Confluence or a wiki holds the decisions. Interviewers care about what the diagram says, not which tool drew it; many teams use the C4 model to keep the levels apart.

From the need to the design

How do you turn a vague business request into requirements you can design against?

What they check: starting from the problem, not from a technology.

Short answer: "I ask what the business wants to achieve and how it will measure it, who the users are, which systems are involved and what may not change. I write the functional requirements as a short list of what the solution must do, agree them with the owner, and mark what is still unknown."

The full answer: Write down the assumptions as well; a design is only as good as what it assumed, and an assumption written down can be checked.

A weak answer: "I take the requirements the business gives me." Follow-up: "The business owner and the head of sales want opposite things." Say what you do.

Which non-functional requirements do you pin down first, and how?

What they check: the qualities that decide most designs.

Short answer: "Non-functional requirements are how well the solution must work rather than what it does: load, response time, availability, security, how long data is kept, cost. I turn each into a number the business agrees to, such as the response time for most requests or the hours of downtime a year it can accept."

The full answer: A quality without a number cannot be tested; "fast" and "secure" start arguments, figures end them.

A weak answer: "It has to be fast and secure." Follow-up: "The owner says it must never be down." Say how you make that a number.

Walk us through a trade-off you made and how you recorded the decision.

What they check: judgement, and a trail others can follow.

Short answer: "We chose a managed database over running our own: less control over tuning, but no team on call for it. I wrote an architecture decision record, a short note with the context, the options, the decision and its consequences, so a new team member could see why."

The full answer: Record what would make you change the decision; when that happens, the record tells the team it is time.

A weak answer: "We used what we always use." Follow-up: "A year later the decision looks wrong." Say what you do with the record.

How would you integrate a new system with a legacy core that cannot change?

What they check: integrationAsked in 1% of solutions architect ads (as of 5 Nov 2026).Connect systems through APIs, events and files so that each can change without breaking the others. in the real world.

Short answer: "I find what the legacy system already offers: files, a database view, an old interface. I put a thin layer in front of it that the new system talks to, so the old one is touched in one place only, and I plan for its slowness and its maintenance windows."

The full answer: The layer in front also prepares the day the legacy system is replaced: the new system will not notice.

A weak answer: "We connect directly to its database." Follow-up: "The legacy system sends one large file a night." Say how near-real-time works anyway.

Plan the migration of an application to the cloud: where do you start?

What they check: cloud architectureAsked in 5% of solutions architect ads (as of 5 Nov 2026).Design for the cloud with its services, limits and costs, not a data centre moved as it is. beyond moving servers.

Short answer: "I start with what the application needs and what it talks to, then choose per part: move it as it is, change it to use managed services, or replace it. I plan the order, the data move and the way back if a step fails."

The full answer: Move a small, low-risk part first; it teaches the team the new platform before the hard part.

A weak answer: "We lift everything at once." Follow-up: "The database is too large to copy in one weekend." Say how you move it.

Cost, failure and security

How do you estimate and control the cost of a solution?

What they check: designs the business can afford over years.

Short answer: "I estimate the total cost of ownership, which is building it plus running, licensing, supporting and later replacing it, not only the first bill. In the cloud I price the main services for the expected load, add tags so each cost has an owner, and set alerts before the budget is reached."

The full answer: Show how cost grows with use; a design that costs little at launch can cost a lot at ten times the users.

A weak answer: "Finance looks after the cost." Follow-up: "The monthly bill doubled." Say where you look first.

How do you design for high availability and disaster recovery?

What they check: planning for failure.

Short answer: "High availability means the solution keeps working when one part fails, for example by running in two zones of a cloud region. Disaster recovery is getting it back after a larger loss, such as a whole region or a data centre, within the time and the data loss the business agreed to. I design to those two agreed figures and test the recovery, not just the backup."

The full answer: Each extra level of availability costs more; show the business the price of each level and let it choose.

A weak answer: "We have backups." Follow-up: "The backup has never been restored." Say what you do this month.

How do you build security into a solution from the start?

What they check: working with security, not around it.

Short answer: "I bring the security team into the first design review, decide who and what may reach each part, encrypt data in transit and at rest, keep secrets out of the code, and plan the logging that will be needed after an incident. Data rules, such as where personal data may be kept, go into the requirements on day one."

The full answer: For a large or sensitive solution, a security architect reviews the design; ask for that review early, when changes are cheap.

A weak answer: "Security tests it before go-live." Follow-up: "The test finds the customer data open to every employee." Say what you change.

How do you use the well-architected frameworks of the cloud providers in a design review?

What they check: a structured review instead of opinions.

Short answer: "The well-architected frameworks of AWS, Microsoft Azure and Google Cloud each list questions on reliability, security, cost, performance and operations. I walk through them with the team, note what the design does not answer yet, and turn the gaps into tasks with an owner."

The full answer: They are checklists, not designs; use them to find what you missed, then decide for this business.

A weak answer: "We passed every point." Follow-up: "Two points conflict: cost and reliability." Say how you decide.

Options, people and delivery

When would you run a proof of concept, and what makes one useful?

What they check: testing the riskiest assumption cheaply.

Short answer: "A proof of concept is a small, time-boxed build that tests whether one risky part of a design works, such as a product's performance with our data. I run one when a decision rests on something nobody has seen working, with success criteria agreed before it starts."

The full answer: Throw the code away afterwards; a proof of concept that quietly becomes the product skips everything the design was for.

A weak answer: "We build the first version and see." Follow-up: "The vendor wants to run the proof of concept for you." Say what you insist on.

Build or buy: how do you decide, and how do you compare vendors?

What they check: a fair decision the business can live with.

Short answer: "I build what sets the business apart and buy what is the same for everyone. For buying, I compare vendors on the requirements, the fit with our systems, the total cost, the exit if we leave and the vendor's own stability, with a scoring agreed before the demos."

The full answer: Ask each vendor the same questions in writing; demos show what a vendor wants to show.

A weak answer: "We buy the product everyone uses." Follow-up: "The cheapest offer locks the data in." Say how that changes the score.

Draw the solution for us: which diagrams do you use, and for whom?

What they check: explaining a design to different people.

Short answer: "A context diagram for the business, showing the solution and what it talks to; a container diagram for the teams; a deployment diagram for operations and security. The C4 model gives those levels names. The tool matters less; draw.io, Lucidchart, Visio or Archi all do it."

The full answer: One diagram for everyone fits no one; keep each to the level its readers need.

A weak answer: "One big diagram with everything." Follow-up: "The CFO has two minutes." Say which picture you show.

What does a good handover to the delivery team look like, and how do you stay involved?

What they check: a design that survives contact with the build.

Short answer: "The handover is a walk-through of the design, the decision records and the open questions with the people who will build and run it, not a document sent by email. After it I join the reviews, answer questions within a day and change the design when the build shows it was wrong."

The full answer: Ask the team to explain the design back to you; what they cannot explain is what you did not hand over.

A weak answer: "After the design my work is done." Follow-up: "The team quietly built it differently." Say what you do.

A customer wants a feature your design cannot carry. What do you do?

What they check: honesty with customers, and pre-salesAsked in 18% of solutions architect ads (as of 5 Nov 2026).Shape a solution with a customer before the contract, and keep promises the team can deliver. judgement.

Short answer: "I find out what the customer needs behind the feature, show what the design can do instead and what the feature would cost in time and risk, and agree a decision with the account team before anything is promised."

The full answer: A promise the delivery team cannot keep costs more than a lost deal; say so early.

A weak answer: "We say yes and solve it later." Follow-up: "Sales has already promised it." Say what you do next.

How would you design a solution that uses AI or holds large amounts of data?

What they check: today's designs, with their risks.

Short answer: "I start with the data: where it comes from, who may use it and how good it is. For AI, I decide whether a provider's model, a model we run ourselves or no model at all fits; I keep a person in the loop where a wrong answer hurts, log inputs and outputs, and plan the cost per request."

The full answer: Data rules and AI rules differ by country; the requirements name the ones that apply, with the company's legal team.

A weak answer: "We add AI to the product." Follow-up: "The model sometimes gives wrong answers to customers." Say how the design catches them.

Senior rounds

As a senior solutions architect, how would you coach an associate solutions architect and shape the team's standards?

What they check: raising others and keeping designs consistent.

Short answer: "I give an associate solutions architect one part of a real design with my review, then a whole small solution. For the team I keep a few standards short: how decisions are recorded, which diagrams every design has, which patterns we reuse, and a review where any architect can ask for a second view."

The full answer: A senior or principal solutions architect is judged by the designs of the people around them, not only by their own.

A weak answer: "I review everything myself." Follow-up: "Two architects designed the same thing twice." Say how you stop that.

Your CV for these questions

Each job on your CV invites the questions above: which solution, which trade-off, what it cost and how it held up. Give those stories a line each, written so an architecture lead wants to hear more:

Put your CV beside a solutions architect job you want with the free score; the area it finds thin is the one to rehearse first, with a design you can draw from memory.