Interaction designer interviews often ask you to walk through a portfolio project, respond to a product scenario or explain a design decision. Strong answers connect the visible interface to the person trying to do something. They make the evidence, the alternatives, the constraints and your own contribution clear.
The UK Government Digital and Data Profession framework describes interaction designers as working out the best way for users to interact with services, from overall flow to individual design elements. Its public role descriptions cover evidence-based design, design communication, inclusion, collaboration, iteration and leadership. It is a helpful preparation lens, not a list of private employer questions.
“I redesigned the dashboard” names an output. “New managers could not tell which action mattered first, so I mapped the decision sequence, tested clearer prioritisation and adjusted the flow after feedback” makes the design reasoning visible.
Use a goal-to-learning answer flow
Whether you are sharing past work or thinking aloud in a case, keep a line between the person, the interaction and the decision. Be direct about what you know and what you would still test.
Name the user, their context, access needs and the outcome that mattered.
Explain the options, information, states and interaction choices you explored.
Describe feedback, iteration, the result and the uncertainty left for the team.
Prepare five stories that show different design judgment
You do not need a different answer for every possible interview question. Build a small bank of examples, with the same honest structure: context, evidence, your role, decision and what happened next.
- A flow story: you made a multi-step task easier to understand or complete.
- An evidence story: research, analytics, support insight or accessibility feedback changed a design direction.
- An inclusion story: you identified an access or comprehension need and adapted the interaction responsibly.
- A collaboration story: you worked with researchers, content designers, developers or product colleagues to resolve a design question.
- An iteration story: a prototype, usability session or release signal led you to improve, simplify or rethink a design.
Coursework, volunteer work and contributions within a larger team can be useful if you label them accurately. Never show confidential user data, and do not present a team's whole delivery as your personal accomplishment.
Work through a design case before making a wireframe
A case study is not a test of how fast you can draw a familiar component. Begin by asking about the user goal, the service context, current evidence, accessibility needs, platform constraints and the decision the team needs to make. Then choose the smallest useful thing to test.
Clarify the task, context, range of needs and potential points of exclusion.
Identify the moment of choice, uncertainty or irreversible action that deserves attention.
Use available research and state the design hypothesis that needs testing.
Propose a proportionate prototype, feedback loop and criterion for changing direction.
Explain why you are postponing lower-risk details. That is not an omission: it shows you can prioritise the unknown that matters most. If a request is ambiguous, name the assumption and explain how you would validate it.
Original practice questions
“Tell me about a flow you simplified.”
Start with what the person was trying to achieve and where they struggled. Explain the evidence, constraints and alternatives you considered, then describe your design choice and what you learned. Keep the contribution and outcome in proportion to the project scope.
“How would you design a service for people with very different levels of confidence?”
Clarify the task, audiences, research and inclusion requirements. Describe how you would avoid treating any group as an edge case, make the essential path understandable and test whether the design supports people with different needs. Do not claim an interface is accessible without appropriate review.
“Describe a time feedback challenged your design.”
Make the original rationale fair before discussing the feedback. Explain the signal, how you investigated it, what changed and why. A strong answer shows curiosity and care, not attachment to the first visual direction.
Ask questions that reveal the design environment
Closing questions can help you understand whether the role has room for responsible design: “How does the team involve users before a flow is committed?” “How are accessibility and inclusion considered during design decisions?” and “What evidence most often changes the team's product direction?”
The UK Government Digital and Data Profession interaction designer framework, updated in August 2026, describes designing with evidence, inclusion, communication, collaboration and iteration across role levels. Use it to structure preparation, not as a promise about every employer.
Turn the job description into an interaction-design story bank.
Match each requirement to a real user goal, design decision, evidence source and learning point you can explain clearly.
Start my interview prep for freeFrequently asked questions
What do interaction designer interviews usually explore?
They commonly explore how you understand user goals, turn evidence into flows or interfaces, collaborate, account for accessibility, test design hypotheses and explain your decisions. The exact format and tools vary by employer and level.
What should I include in an interaction design portfolio story?
Explain the user goal, the context and constraints, the evidence you used, the alternatives you considered, your own contribution and what changed after testing or delivery. A clear explanation is more useful than a gallery of polished screens.
Can I discuss work that was completed by a design team?
Yes, when you make your contribution and collaborators clear. Describe shared decisions fairly, protect confidential information and explain which research, flow, prototype or iteration you personally led or supported.