Frontend Developer / UI-UX Designer interview questions
Common interview questions and sample answers for Frontend Developer / UI-UX Designer roles in IT & Technology across Oman and the GCC.
The 10 questions below are compiled from interviews our consultants have run with IT & Technology employers across Oman and the wider GCC. Each comes with a sample answer and what the interviewer is really listening for.
Category
Opening & warm-up
How interviewers test your communication and preparation right from the start.
Walk me through your frontend career.
I've been doing frontend development for six years, three in Oman. Started in jQuery and PHP days at an Indian agency, moved into React in 2020, and for the past three years I've been senior frontend at an Omani digital banking team. My day-to-day is mostly React with TypeScript, Tailwind for styling, React Query for data fetching, and Storybook for component documentation. I work closely with our two designers on the UI/UX, plus our mobile team on shared design tokens. I've shipped roughly 30 customer-facing features across two products.
Modern stack and clear collaboration model.
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Behavioural (STAR)
Past-experience questions. Use the STAR framework: Situation, Task, Action, Result.
Tell me about a complex UI you built.
Last year I built our wealth-management dashboard: a single-page app with 12 different widgets, real-time data updates via WebSocket, customisable layouts saved per user, and full accessibility (WCAG AA). The challenge was performance: 12 widgets all wanting fresh data created chatty network behaviour and re-render storms. I implemented a smart batching layer that consolidated requests, plus React.memo and useMemo aggressively to prevent unnecessary renders. Final dashboard loads in under 1.5 seconds and updates feel instant. Performance work is invisible when done right; users don't notice until it's gone.
Real performance engineering plus accessibility awareness.
Describe how you collaborated with designers on a feature.
On a recent onboarding flow the design called for a multi-step wizard with custom animations. I sat with the designer at the wireframe stage rather than waiting for final mocks; I flagged technical constraints (some animations would harm performance on older devices) and we adjusted together. By the time the design was final, I'd already validated the technical feasibility. Build was smooth, and the QA round had zero design discrepancies because we'd aligned earlier. The frontend engineer who waits for finished designs creates expensive surprises late.
Practical designer collaboration.
Tell me about a bug that taught you something.
Once I shipped a feature that worked perfectly in my testing but caused a critical issue on real customer accounts: the form would submit twice if the customer double-clicked. I'd assumed customers wouldn't double-click. Lesson: real users do unexpected things; defensive coding (debouncing, disabling buttons during submit, idempotency at the API level) is non-negotiable. Now every form I build assumes customers will submit twice, refresh during loading, and lose internet mid-transaction.
Real-world humility and defensive coding instinct.
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Technical & role-specific
Questions that test your specific skills for this role.
How do you approach state management?
Hierarchy of options. Local component state for UI-only state (form fields, modal open/closed). React Query for server state (caching, refetching, mutations). Context for cross-component state that doesn't change often (theme, current user, auth status). Redux or Zustand only for genuinely complex shared state that crosses many components. I avoid putting server state in Redux; that's been a common anti-pattern in our industry for years. The goal is the minimum complexity that solves the problem.
Pragmatic state management thinking.
Describe your testing approach for frontend code.
Layered. Component tests with React Testing Library covering rendering, user interactions, and edge cases. Integration tests for full features (login flow, payment flow) using Cypress or Playwright. Visual regression tests for design-system components to catch unintended CSS changes. End-to-end tests in CI before production deploys. Coverage target is around 70% for application code, higher for critical paths. I don't chase 100%; the last 20% rarely catches real bugs.
Real test strategy.
How do you optimise frontend performance?
Measure first: Web Vitals (LCP, FID, CLS) from real-user monitoring tells me what to optimise. Common wins: code splitting per route, lazy loading components below the fold, image optimisation (next/image or equivalent), caching static assets aggressively at the CDN, removing unused dependencies. For data-heavy UIs: virtualised lists for long scrolling content, debounced search inputs, optimistic UI updates so the user feels speed. Avoid over-optimising what isn't slow; engineering time is precious and most prematurely-optimised code is harder to maintain.
Performance instinct grounded in measurement.
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Situational
Hypothetical scenarios designed to test your judgement and approach.
A designer asks for an animation that you know will hurt performance. What do you do?
Explain the trade-off concretely, not just 'it'll be slow'. I'd build a quick prototype showing the performance impact, then discuss alternatives: simpler animation that achieves a similar feel, animation that only runs on capable devices, or accepting the cost if it's truly important to the design intent. Designers respect engineering pushback when it comes with options and evidence, not just objections. Sometimes my assumption about the cost is wrong; sometimes the design intent justifies the cost. Either way, real conversation beats unilateral decision.
Constructive collaboration with non-engineering peers.
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Cultural fit & motivation
Why this role, why this company, and how you work with others.
How do you handle accessibility?
Accessibility is baked in, not bolted on. Semantic HTML by default (button for buttons, not divs with onClick). Proper labelling on form inputs. Keyboard navigation tested as I build, not at the end. Colour contrast checked against WCAG AA. Screen reader testing on critical flows (NVDA on Windows, VoiceOver on Mac). I treat accessibility as a non-negotiable spec, not a nice-to-have. Customers with disabilities are real customers; ignoring them is both ethically wrong and commercially short-sighted (and increasingly legally exposing).
Genuine accessibility commitment.
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Closing
The final stretch. Often where deals are won or lost.
What are your salary expectations?
For a senior frontend engineer role in Oman I'd target OMR 1,400 to 1,800 total package depending on the team and tech stack. Modern React/TypeScript shops pay better than legacy jQuery/PHP work. I'm on 60 days' notice. Beyond pay I'd value the design and product partnership; frontend engineering in an org with strong design and PM is fundamentally different from frontend in an order-taker shop.
Researched range and partnership-quality preference.
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