Applied online and got to a phone screen in about two weeks. The recruiter screening was standard, covering background and expectations.

Next was the technical screen with iOS-specific questions and a coding challenge on data structures and algorithms (two numbers in an array that sum up to a target). Expect optimizations and edge case handling. I was also asked about memory management in iOS.

The onsite was a full-day loop, including:

• Two coding rounds
• One system design round
• One behavioral round
• One team collaboration round

The coding rounds had a mix of general algorithms and iOS-specific problems, such as reversing a linked list in Swift. The system design round focused on structuring an iOS app, acting more as a conversation covering storage, networking, and architecture, with follow-ups on handling real-time data sync.

The behavioral and team collaboration rounds were mostly about leadership, teamwork, and problem-solving. There was also a deep dive into one of my past projects.

Using LeetCode, Blind 75, and mocks on Prepfully with ex-iOS engineers helped a lot!

How would you design a flight booking app?