What Happens In An iOS Interview?
- Jun 2, 2025
- 5 min read
What Happens In An iOS Interview?
One of the most common concerns among iOS developers is uncertainty about what actually happens during a technical interview.
This uncertainty is understandable. Most developers spend their time building applications, fixing bugs, attending meetings, reviewing pull requests, and delivering features.
Interviewing is something that may only happen every few years. By the time the next opportunity arrives, many developers have forgotten what the process looks like and which areas of knowledge employers are likely to explore.
The good news is that iOS interviews are often far more predictable than people expect.
While every company has its own process, most interviews are trying to answer a relatively small number of questions. Can the candidate build software? Do they understand Swift?
Can they work effectively with other developers? Can they make sensible engineering decisions? Most interview stages are simply different ways of evaluating these areas.
Understanding what interviewers are looking for can make the process feel considerably less intimidating.
The Initial Conversation
Many interview processes begin with an introductory conversation involving a recruiter, hiring manager, or engineering lead.
This stage is usually less concerned with technical details and more focused on understanding your background, experience, interests, and career goals. Interviewers may ask about previous projects, the types of applications you have worked on, the technologies you use most frequently, and the kind of role you are looking for next.
While this conversation is not typically considered a technical assessment, it still matters.
Employers are trying to determine whether your experience aligns with the position and whether there appears to be a good fit between your goals and the needs of the team.
Developers sometimes underestimate the importance of this stage because they are focused entirely on technical preparation. Communication skills, enthusiasm, and the ability to discuss previous work clearly can have a significant impact on the overall process.
Questions About Swift
At some point, most iOS interviews will explore your understanding of Swift.
The depth of these questions varies depending on the level of the role, but certain topics appear regularly because they reveal how well a candidate understands the language itself.
Interviewers often discuss protocols, closures, optionals, value semantics, reference semantics, ARC, generics, error handling, access control, concurrency, and modern language features.
The purpose is not usually to test memorisation.
Most interviewers are far more interested in understanding how you think about these concepts and whether you can explain them clearly. A candidate who understands why value semantics matter or how retain cycles occur will generally perform better than someone who has simply memorised a definition.
This is one reason many developers spend time revisiting Swift fundamentals before interviews. Concepts that are used intuitively during day to day development often need to be explained explicitly during an interview.
Architecture And Application Design
As developers progress beyond junior positions, architecture discussions become increasingly common.
Interviewers may ask how you would structure a new application, how you separate responsibilities between components, how data flows through a system, or how you approach testing. They may explore architectural patterns, dependency injection, state management, networking strategies, or approaches to maintaining large codebases.
These discussions are valuable because they reveal how a developer approaches complexity. Building a feature is important, but companies also want confidence that a candidate can contribute to systems that remain maintainable as they grow.
There is rarely a single correct answer during these conversations. Interviewers are often more interested in the reasoning behind your decisions than the specific pattern you choose.
Coding Exercises
Many companies include some form of practical coding assessment.
This may involve solving a problem in real time, completing a take home exercise, reviewing existing code, or discussing how you would implement a particular feature. The format varies considerably between organisations, but the goal is usually the same: understanding how you approach problems when writing code.
Developers sometimes worry that these exercises are designed to trick them.
In reality, most companies are simply trying to observe how you think. They want to see how you break problems into smaller pieces, how you communicate your reasoning, and how comfortable you are working with the language.
Perfect code is rarely the expectation.
Clear thinking is usually far more important.
Questions About Real World Experience
One area that catches some candidates by surprise is the number of questions focused on previous projects.
Interviewers often ask about technical challenges you have faced, mistakes you have made, architectural decisions you have taken, difficult bugs you have solved, or situations where you disagreed with a proposed approach. These questions help employers understand how you behave in real engineering environments.
This is where experience becomes valuable.
Candidates who can discuss genuine examples from their careers often create stronger impressions because they demonstrate practical problem solving rather than theoretical knowledge alone.
If you have worked on production applications, spend some time reflecting on the projects you have completed and the lessons you learned from them. Those experiences frequently provide the strongest answers during an interview.
Modern Topics Are Appearing More Frequently
The Swift ecosystem continues evolving, and interview processes evolve alongside it.
Today, it is increasingly common to encounter discussions about concurrency, actors, async and await, testing strategies, dependency injection, SwiftUI, state management, accessibility, and performance optimisation. Companies recognise that modern iOS development looks different from iOS development several years ago, and many interview processes now reflect those changes.
This does not mean older topics have disappeared.
Protocols, ARC, value semantics, closures, generics, and architecture discussions remain extremely common because they continue forming the foundation of modern Swift development.
Developers who focus exclusively on the latest technologies sometimes discover that interviewers remain equally interested in the fundamentals.
What Interviewers Are Really Looking For
Many candidates assume an interview is primarily an examination of technical knowledge.
Technical knowledge is certainly important, but most employers are trying to evaluate something broader.
They want to understand whether you can solve problems, communicate clearly, collaborate effectively, and make sensible engineering decisions. They want confidence that you can contribute positively to the team and continue learning as technologies evolve.
This is one reason interviews often feel more conversational than many candidates expect.
Strong candidates are not necessarily those who know every answer immediately. They are often the candidates who reason through problems effectively, explain their thinking clearly, and demonstrate a solid understanding of the fundamentals.
How 3DaysOfSwift Helps Developers Prepare
One observation that inspired 3DaysOfSwift is that many developers already know more Swift than they realise.
The challenge is often recall rather than understanding.
A developer may have used protocols, ARC, closures, concurrency, generics, and property wrappers many times throughout their career, yet still feel uncomfortable discussing them during an interview because those concepts have not been revisited recently. A short period of focused revision can often restore confidence surprisingly quickly.
To help support this process, 3DaysOfSwift currently provides 40 free downloadable Xcode playgrounds covering 29 Swift language features and concepts commonly discussed throughout professional iOS development and technical interviews. Developers can revisit language fundamentals, experiment with code, and strengthen understanding through practical exploration rather than passive reading.
You can explore the complete collection here:
Final Thoughts
Most iOS interviews are not designed to catch developers out. They are designed to understand how you think, how you solve problems, and how deeply you understand the tools you use every day. While the process can feel intimidating, the majority of interview questions revolve around a relatively consistent collection of topics including Swift fundamentals, architecture, problem solving, communication, and real world experience.
The developers who perform best are often not those who memorise the most answers. They are the developers who maintain a strong understanding of Swift, can discuss their experiences honestly, and approach technical conversations with confidence. With a little preparation and a willingness to revisit important concepts, most interviews become far more predictable than they initially appear.
Good luck.
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