iOS developer Interview Questions

The goal for a successful interview for an iOS developer is to demonstrate their knowledge and expertise in developing applications for Apple’s iOS platform, showcase their problem-solving skills, and exhibit their ability to work in a team environment.

Situational interview questions

• Imagine a situation where your app crashes, causing unexpected data loss for your users. What steps would you take to diagnose the root cause of the problem? How would you communicate with your team and your users during this process?
• Your team is working on a complex feature that involves integrating with a third-party API, but you’ve hit a roadblock and the API documentation isn’t clear on the way forward. How would you approach this challenge, and what steps would you take to ensure that your team is successful in delivering the feature?
• Your app is experiencing a high volume of traffic, causing some users to experience slow load times or even crashes. How would you identify the bottleneck in your app’s performance, and what steps would you take to optimize it for better scalability?
• A user has reported a critical bug in your app that causes unexpected behavior when performing a specific action. How would you go about reproducing the issue and analyzing the underlying code to fix the problem? What steps would you take to ensure that the bug is fixed and doesn’t reappear in future releases?
• Your team has been tasked with implementing a new feature in your app that requires adopting a new technology or programming language that none of your team members are familiar with. How would you approach learning and implementing this new technology, and what steps would you take to ensure that your team is successful in delivering the feature on time and on budget?

Soft skills interview questions

• Can you tell me about a time when you had to communicate a complex technical concept to a non-technical team member or client?
• How have you handled conflicts or disagreements with team members, and what steps did you take to resolve them?
• Can you give me an example of how you have demonstrated strong time management skills in a previous iOS development project?
• Have you ever had to adjust your approach to working with a team member who had a different style or personality? How did you manage that?
• Can you share a time when you had to adapt to changing priorities or requirements in an iOS development project? How did you handle it?

Role-specific interview questions

• What are the different methods to optimize the startup time of an iOS application?
• How would you integrate third-party APIs into an iOS application?
• How do you handle the memory management in iOS application development?
• Can you explain the difference between retain count and reference count in iOS?
• How would you go about debugging performance issues in an iOS application?

STAR interview questions

1. Situation: Can you describe a time when you were tasked with developing an iOS app?

Task: What were your main responsibilities and objectives?

Action: What steps did you take to develop the app, such as choosing programming languages, designing UI, and debugging?

Result: What was the final app’s functionality and how did it perform in the market?

2. Situation: Have you ever faced any issue in your iOS development project?

Task: What was your responsibility in that project?

Action: What steps did you take to identify the issue and resolve it?

Result: What was the final outcome and how did it impact the project?

3. Situation: Have you ever worked in a team to develop an iOS app?

Task: What was your role and responsibility in the team?

Action: Can you describe the project development process, including collaboration with other team members, communication, and feedback?

Result: What was the final outcome of the project and how was it received by users?

4. Situation: Can you describe a time when you developed a feature that improved the performance of an iOS app?

Task: What was your objective or responsibility in that project?

Action: What steps did you take, such as optimizing code, testing, and debugging?

Result: How did the feature improve the app’s performance and what feedback did you receive from users?

5. Situation: Have you ever had to work on a tight deadline for an iOS development project?

Task: What was your role and responsibility in that project?

Action: What measures did you take to work efficiently and meet the deadline, such as prioritizing tasks, working overtime, or asking for help?

Result: Was the project delivered on time and how did it perform in the market?