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Mobile Application Developer interview questionsCoding Test round

A 60 min interview plan with a time-boxed script, what each question is for, and the signals to score against. Key skills: Coding, App Development, iOS/Android Platforms, Swift/Kotlin, Performance Optimization.

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Introduction

5 min
•

Hi, I’m [YOUR_NAME], and I’m a [YOUR_TITLE] at [COMPANY_NAME]. I’m excited to learn more about your experience today.

•

Could you briefly introduce yourself and share what attracted you to apply for this position?

What this question is for, and what to listen for

Purpose

Assess communication skills, alignment with the role, and initial confidence.

Signals to score

  • Clear introduction provided
  • Relevant experience mentioned
  • Motivations for applying explained
  • Alignment with team values
  • Specific skills highlighted
  • Response is concise and organized
  • Understanding of role requirements

Follow-up questions

  • What excites you most about this position?
  • How does your background align with our team’s work?
•

Great, thank you for sharing! In the next 50 minutes, we’ll focus on a coding challenge related to mobile app development. After that, you can ask any questions you have about the role or the company.

Coding Challenge

50 min
•

Challenge: Develop a simple mobile app feature Create a function in Swift/Kotlin that fetches a list of items from a mock API and displays them in a list view. Ensure the app handles loading states and errors gracefully. Follow-Up Questions: - How would you optimize the performance of this feature? - What considerations would you make for different screen sizes and orientations?

What this question is for, and what to listen for

Purpose

Assess coding skills, understanding of iOS/Android platforms, and ability to handle performance optimization.

Signals to score

  • Clear understanding of the task
  • Logical and structured approach
  • Efficient use of Swift/Kotlin
  • Handles loading states and errors
  • Considers performance optimization
  • Considers screen size/orientation
  • Explains thought process clearly

Follow-up questions

  • How do you plan to handle API errors?
  • Can you explain your approach to managing loading states?
  • How would you test this feature on different devices?
•

If you had more time, what would you change in your solution?

What this question is for, and what to listen for

Purpose

Assess the candidate's ability to reflect on their work, identify areas for improvement, and demonstrate critical thinking and problem-solving skills.

Signals to score

  • Recognizes limits in their original answer.
  • Points out clear areas to improve.
  • Suggests specific changes.
  • Talks about how changes could help performance.
  • Shares ideas clearly and logically.
  • Shows a desire to learn and improve.

Follow-up questions

  • What additional features would you consider adding?
  • How would you improve the user experience?
•

Great job on the coding exercise!

Closing

5 min
•

Do you have any questions for me about the team or the company?

What this question is for, and what to listen for

Purpose

Gauge the candidate’s curiosity and interest in the role.

Signals to score

  • Thoughtful questions asked
  • Interest in company culture
  • Curiosity about growth expressed
  • Questions about role raised
  • Inquiries about team challenges
  • Engagement with responses shown
  • Desire to learn next steps
  • Focus on company values expressed

Follow-up questions

  • What interests you most about this team?
  • Are there any areas of the role you’d like to explore further?
•

Thank you for your time today. We’ll be in touch soon regarding the next steps.

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Interview Template
Position
Mobile Application Developer
Round
Coding Test for 60 min
Key skills
Coding, App Development, iOS/Android Platforms, Swift/Kotlin, Performance Optimization

Mobile Application Developer interviews — common questions

Who is this Mobile Application Developer interview plan for?
It is written for the interviewer, not the candidate: the hiring manager, engineer or panel member running the Coding Test round for a Mobile Application Developer role. It gives you a 60 min script to follow in the conversation — 4 questions with what each one is for and the signals to score against — so you are not writing the round from scratch the night before.
What does the Coding Test round assess?
This round is focused on: Coding, App Development, iOS/Android Platforms, Swift/Kotlin, Performance Optimization. It works through Introduction, Coding Challenge and Closing, scoring against 28 observable signals, with follow-up prompts on all 4 questions for going deeper where an answer is thin.
How is the 60 min split up?
Introduction (5 min), Coding Challenge (50 min), Closing (5 min). The timings are there so the round stays on schedule and every candidate gets the same shape of interview — which is what makes two candidates comparable afterwards.
What other rounds should I run for a Mobile Application Developer?

A single round does not cover a whole role. The other rounds in this library for a Mobile Application Developer: