The interview process

Most iOS hiring processes have the same building blocks. Companies mix them in different orders. Knowing the blocks helps you prepare for any company.

#The typical rounds

A common pattern looks like this:

Recruiter screen -> Technical screen -> Onsite loop (4-6 rounds) -> Team match -> Offer

Big tech companies often have a long onsite "loop" (many rounds in one or two days). Smaller companies and startups often use a take-home instead of a DSA round. Agencies may ask more about shipping apps fast and working with clients.

Always ask the recruiter: "What rounds are in the process, and how should I prepare?" Recruiters want you to do well. Many will tell you a lot.

#1. Recruiter screen

This is a friendly call. It is not technical, but it can still end your process.

What they check:

• Your experience matches the role (years, Swift, SwiftUI or UIKit).
• You can explain your work clearly.
• Your salary range and location fit.
• You are really interested.

Common questions and short sample answers:

"Tell me about yourself." "I am an iOS developer with 4 years of experience. I work on a fitness app with 500k monthly users. I own the workout player and the offline sync. Last year I led our move from UIKit to SwiftUI for new screens. Now I want to work on a bigger product with a strong mobile team."

"Why are you looking?" "I have learned a lot in my team. Now I want bigger technical challenges and more users."

"What salary are you looking for?" "I would like to learn more about the role and level first. Can you share the range for this position?"

Keep the first answer under 90 seconds. Prepare it before the call.

#2. Technical phone screen

This is a short version of the onsite. It is often one coding problem, or a mix of coding and iOS questions. Usually it runs in a shared online editor, not Xcode.

What they check: Can you write working Swift without autocomplete? Can you talk while you code?

Practise writing Swift in a plain editor. Small things like this become hard without Xcode:

// Without autocomplete, can you write these from memory?
let sorted = names.sorted { $0.count < $1.count }
var counts: [Character: Int] = [:]
for c in word { counts[c, default: 0] += 1 }
let chars = Array("hello")   // [Character]

#3. Coding round (DSA in Swift)

DSA means data structures and algorithms: arrays, strings, hash maps, trees, graphs, sorting, recursion.

What they check:

• You clarify the problem before coding.
• You find a working solution, then improve it.
• You know the time and space complexity (Big O).
• Your code is clean and correct.
• You test it with examples.

The problems are usually easy or medium level. A typical one: "Group words that are anagrams of each other."

See the Coding interviews chapter for a step-by-step method and Swift gotchas.

#4. iOS knowledge round

This is a conversation about the platform. It can be quick questions ("What is @escaping?") or one topic in depth ("Walk me through what happens when a view controller is shown.").

What they check:

• Real understanding, not memorised definitions.
• Practical experience: "When did you use this?"
• Trade-offs: "Why actor and not a serial queue?"

A typical chain of questions goes deeper each time:

1. "What is ARC?"
2. "What is a retain cycle?"
3. "When do you use weak vs unowned?"
4. "How would you find a retain cycle in a real app?"

The last question checks experience. A good answer mentions the Memory Graph Debugger in Xcode or the Leaks tool in Instruments.

See the iOS knowledge interviews chapter.

#5. UI coding round or take-home

You build a real screen. There are two forms.

• Live: 60–90 minutes, often in Xcode with screen sharing. Example: "Build a list that loads images from this API."
• Take-home: a small app you build at home in a few hours or days. Example: "Build a weather app with search and a detail screen."

What they check:

• Clean structure (for example MVVM).
• Correct networking, decoding and error handling.
• Loading, empty and error states.
• Tests for the logic.
• A clear README that explains your choices.

See the UI coding and take-homes chapter.

#6. Mobile system design

You design an app or a feature at a high level. Examples: "Design an Instagram-like feed" or "Design offline support for a notes app".

What they check:

• You ask about requirements first.
• You split the app into clear layers (UI, view models, repository, network, storage).
• You go deep on 2–3 hard parts: caching, pagination, offline, sync.
• You explain trade-offs.

This round is more common for mid-level and senior roles. See the System design interviews chapter.

#7. Behavioral round

The interviewer asks about your past. "Tell me about a time when…"

What they check:

• Ownership: do you take responsibility?
• Collaboration: how do you work with designers, product managers and other teams?
• Conflict: how do you handle disagreements?
• Growth: do you learn from mistakes?

For senior roles, this round has a big effect on your level. Strong stories about leading projects and helping others can move you up a level.

See the Behavioral interviews chapter.

#How the decision is made

After the loop, interviewers write feedback. Often a group (a "hiring committee" or "debrief") reads it and decides. Each interviewer usually gives a score, like "strong hire", "hire", "no hire".

Things to know:

• One weak round does not always fail you. Strong rounds can balance it.
• Communication shows in the notes. Interviewers write what you said, not only what you coded.
• Level is decided here too. Your system design and behavioral rounds often decide junior vs mid vs senior.

#Questions to ask the recruiter

Send these in an email or ask on the first call:

• How many rounds are there, and what is each one?
• Is the coding round in Xcode or in an online editor?
• Is there a take-home? How much time do I get?
• Is there a system design round for this level?
• Which level am I being considered for?
• What is the timeline for a decision?

#Questions to ask your interviewers

At the end of most rounds you get 5 minutes for your questions. Always use them. Good questions show interest.

• "Is the app mostly SwiftUI, UIKit, or both?"
• "How do you test the app? What runs in CI?"
• "How often do you release to the App Store?"
• "What is the hardest technical problem the team has now?"
• "How do iOS and Android engineers work together?"

Avoid questions you could answer with a quick search, like "What does the company do?"

#Summary

• Learn the 7 round types. Every company uses some of them.
• Ask the recruiter which rounds you will have.
• Communication is checked in every round.
• System design and behavioral rounds often decide your level.

Next, the Preparation plan chapter shows how to prepare for these rounds in 1 week, 1 month or 3 months.