Interviewing a UI/UX designer tests the full arc from research to polished interface. Assess how they run user research and usability testing, define information architecture and flows, wireframe and prototype, and deliver accessible high-fidelity design within a design system. Strong candidates validate decisions with real users rather than taste alone, balance user needs against business and technical constraints, and collaborate closely with product and engineering.
Walk through their portfolio for the reasoning behind decisions, not just the visuals, and probe how research shaped the outcome. Use scenarios around conflicting feedback, an accessibility gap, and a tight constraint to test their judgment. The strongest designers ground choices in user evidence, contribute to a scalable design system, design accessibly by default, and partner with engineering from discovery through delivery rather than tossing mockups over a wall.
Walk me through a project in your portfolio from research to final UI. What decisions did the research drive?
What to look for: A clear problem, research methods chosen for the question, insights that changed the design, and a defensible link from evidence to interface decisions.
How do you plan and run a usability test, and what do you do with the findings?
What to look for: Defining what to learn, a realistic task-based test, observing behavior over opinion, synthesizing findings, and iterating rather than just collecting comments.
How do you approach information architecture and user flows for a complex feature?
What to look for: Mapping user goals and tasks, reducing friction, methods like card sorting, and flows that reflect real mental models rather than the org chart.
How do you build or contribute to a design system so it stays consistent and scalable?
What to look for: Reusable components and tokens, clear usage guidelines, governance, and collaboration with engineering so the system is adopted, not ignored.
How do you design accessibly? Give concrete examples of accommodating accessibility in your work.
What to look for: Color contrast, focus order, keyboard and screen-reader support, semantic structure, and treating accessibility as a default rather than a final check.
Show me how you'd go from low-fidelity wireframes to a high-fidelity prototype in Figma. When do you stay low-fi?
What to look for: Advanced Figma use, knowing when fidelity adds value versus slows learning, components and auto-layout, and prototyping to validate interactions.
Tell me about a time user research overturned your own assumption or a stakeholder's. What happened?
What to look for: Genuine openness to evidence, changing direction based on findings, and influencing stakeholders with research rather than defending ego.
Describe a design you shipped that measurably improved a user or business outcome.
What to look for: A clear problem, a thoughtful solution, and a real result such as improved task success, conversion, or reduced support load.
Give an example of balancing user needs against business goals and technical constraints.
What to look for: Pragmatic tradeoffs, collaboration with product and engineering, and a solution that served users without ignoring reality.
Tell me about a time you received tough design feedback. How did you handle it?
What to look for: Separating ego from work, probing the underlying concern, iterating, and distinguishing useful feedback from noise.
Describe how you contributed to or improved a design system in a past role.
What to look for: A concrete contribution, collaboration with engineering, and a real gain in consistency, speed, or quality across the product.
Stakeholders give you conflicting feedback on a design and each insists they're right. How do you resolve it?
What to look for: Reframing around user goals and evidence, facilitating alignment, proposing a test, and deciding based on the user rather than the loudest voice.
You have very little time and no budget for research before a launch. How do you de-risk the design?
What to look for: Lightweight methods like quick guerrilla tests, heuristics, or analytics, reasonable assumptions stated openly, and prioritizing the riskiest unknowns.
Engineering says your design is too costly to build as-is. How do you respond?
What to look for: Understanding the constraint, preserving the core user value, proposing a feasible alternative, and collaborating rather than digging in.
Analytics show users abandoning a key flow you designed. How do you diagnose and fix it?
What to look for: Combining quantitative data with qualitative testing to find the friction, forming a hypothesis, and validating the redesign rather than guessing.
How do you collaborate with product managers and engineers from discovery through delivery?
What to look for: Early involvement, shared problem framing, design that anticipates implementation, and staying engaged through build rather than handing off and leaving.
How do you present and defend design decisions to stakeholders who disagree?
What to look for: Grounding decisions in user needs and evidence, listening genuinely, and influencing without becoming defensive or simply deferring.
How do you advocate for the user and for accessibility when there's pressure to cut corners?
What to look for: Making the case in user and business terms, finding pragmatic paths, and holding the line on essentials like accessibility.
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