Citi iOS Developer Interview Experience — Irving, TX 💻

I applied for an iOS developer role at Citi through a recruiter, and the entire process wrapped up in just 2 days.

📞 Interview Process

Two phone rounds, both technical:

• Swift & iOS fundamentals
• Real-world problem solving
• Discussion around my past projects

The interviewers were friendly but straight to the point.

What They Were Testing

Citi wasn’t trying to trick me. They wanted to know:

• Can you explain your thought process?
• Do you understand fundamentals?
• Can you write maintainable iOS code?
• Have you actually built apps?

It felt more like a discussion with another engineer than a typical interview.

Questions Asked

Here are some of the questions I remember:

• What is protocol-oriented programming? How do we use it? Why do we prefer it in Swift? When have you used it?
• Difference between class and struct? When would you choose one over the other?
• How does ARC work? What causes memory leaks and how do you avoid them?
• Explain delegation vs closures vs NotificationCenter.
• How would you design a simple networking layer in Swift?
• How do you handle errors from an API call in your app?
• Tell me about a bug you struggled with and how you fixed it.

For POP, I explained how I use protocols to:

• Abstract services
• Enable dependency injection
• Make code testable
• Avoid deep inheritance

They were clearly more interested in real usage than definitions.

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💬 Discussion Around My Work

We also talked about:

• Apps I’ve built
• Architecture choices
• Trade-offs I made
• What I’d improve if I rewrote them today

This part mattered a lot. They wanted to see ownership and clarity.

🔥GET: ***Cracking the iOS Interview — Cheat Sheet ♥***