Interview Questions for Hiring a Frontend Developer
Hiring a frontend developer requires testing both technical competence and communication skills within a Swiss context. Use these grouped questions to assess JavaScript/TypeScript proficiency, component design thinking, performance awareness, and collaboration style. Each question includes markers for strong versus weak answers, plus flags for legally sensitive areas under Swiss employment law.
Frontend developers in Switzerland typically work on 80–100% Pensum roles across tech hubs (Zurich, Basel, Geneva) and rural cantons alike. Your interview should probe real-world capabilities: API integration, state management, responsive design, and debugging under pressure.
This guide structures questions by competency rather than a rigid script. Ask follow-ups based on answers. Flag questions that touch on protected characteristics (age, marital status, health) to stay compliant with Swiss employment law.
Technical Depth & Problem-Solving
Open with concrete technical scenarios that reveal how candidates think through trade-offs. Avoid questions with one 'correct' answer; listen for reasoning.
Strong answers show awareness of context (browser support, performance budgets, team maturity). Weak answers are vague, lack specifics, or suggest copy-paste coding without understanding.
- Tell me about a component you built recently that needed to handle complex state. How did you decide between useState, useContext, or external libraries like Redux?
- Walk me through how you'd debug a CSS layout issue that only appears on Safari iOS. What tools do you reach for first?
- Describe a time you had to optimize a slow frontend. What metrics did you measure, and how did you validate the fix?
- How do you approach accessibility (WCAG)? Give an example of an accessibility bug you caught and fixed.
- Explain the difference between controlled and uncontrolled components. When would you choose each?
- Tell me about a technical decision you disagreed with on your team. How did you handle it?
Collaboration, Learning & Communication
Frontend work in Swiss SMEs often means wearing multiple hats: design input, stakeholder demos, onboarding juniors. Test communication and adaptability.
Strong answers show curiosity, willingness to explain decisions clearly, and respect for non-technical perspectives. Weak answers suggest isolation, defensiveness, or inability to articulate reasoning to others.
- Tell me about a time a designer or product manager pushed back on your implementation. How did you respond?
- Describe your approach to code review. What do you prioritize when reviewing someone else's pull request?
- How do you stay current with frontend trends (React versions, new CSS features, tooling)? Give a specific example.
- Have you mentored or onboarded a junior developer? What did you focus on teaching them?
- Walk me through how you'd explain a technical constraint to a non-technical stakeholder.
- Tell me about a project where the scope or timeline shifted unexpectedly. How did you adapt?
Fit for Swiss Work Culture & Role Expectations
Swiss employers value directness, reliability, and clarity. Use these questions to understand work style, expectations around Pensum/flexibility, and long-term fit.
⚠️ Flag: Questions 2, 3, and 5 below touch on age, family status, and health. In Switzerland, avoid these unless directly relevant to the role. A legal review is wise before asking.
- This role is [X]% Pensum. How does that fit your circumstances? Are you open to flexible hours for client meetings or deployment windows?
- ⚠️ RISKY: Tell me about your family situation and how you balance work with personal commitments. [Avoid unless workplace flexibility is a genuine operational need; consult employment lawyer.]
- ⚠️ RISKY: Do you have any health conditions or disabilities we should accommodate? [Use only if offering a formal role; consult lawyer first. Rely instead on 'Do you require any workplace accommodations?']
- Why are you looking to move (or stay) in [canton/region]? What draws you to work here?
- ⚠️ RISKY: What's your age range or expected career length? [Illegal to ask directly. Rephrase: 'Where do you see your frontend career in 5 years?']
- Tell me about a role or team where you thrived. What made the culture work for you?
Frequently asked questions
- Should I ask about salary expectations upfront?
- Yes, but separately from the interview. In Switzerland, it's standard to share a salary band (e.g., 100–130 kCHF depending on experience and canton) before investing time. This avoids mismatched expectations. Ask early in the recruitment process, not during a technical interview.
- What if a candidate cannot answer a technical question?
- Ask a follow-up: 'Have you faced this before? How would you approach it?' This reveals problem-solving over memorization. Junior developers may lack experience; assess hunger to learn instead. For mid-level+ hires, repeated 'I don't know' without curiosity is a signal.
- How do I avoid illegal questions in Switzerland?
- Stick to job-relevant questions about skills, experience, and work style. Avoid age, marital status, sexual orientation, religion, political views, and health (except formal disability accommodations after a conditional offer). When in doubt, consult an employment lawyer licensed in the relevant canton.
General information for Swiss employers, not legal advice. Have a lawyer confirm anything with legal consequences.