Hiring Guide

Top 40 Swift Coding Challenges with Solutions

Curated collection of challenging Swift programming questions designed for senior developers. Covers advanced topics, architectural decisions, and performance optimization.

Core Concepts
Data Structures and Algorithms
System Design
Coding and Debugging

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Our expert-vetted Swift challenges help identify top 5% talent through real-world scenarios. Used by leading tech companies to evaluate advanced Swift knowledge and problem-solving abilities.

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Core Concepts

Data Structures and Algorithms

System Design

Coding and Debugging

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Top 40 Swift Coding Challenges with Solutions

AI-Powered Technical Assessment

Core Concepts

Implement a thread-safe singleton pattern in Swift

How would you implement a custom memory management solution for a cache system?

Create a protocol that implements the Observer pattern with generics

Implement a custom Result Builder for a DSL

Design a type-safe networking layer using protocols and generics

Implement a custom property wrapper for data persistence

Create a custom async sequence for pagination

Implement a type-safe dependency injection container

Create a custom SwiftUI property wrapper for validation

Implement a custom Combine operator for debouncing with timeout

Data Structures and Algorithms

Implement a thread-safe LRU Cache in Swift using generics

Implement a solution to find all pairs in an array that sum to a target value with O(n) time complexity

Implement a thread-safe Singleton pattern in Swift

Implement a sliding window algorithm to find the maximum sum subarray of size k

Implement a concurrent queue data structure in Swift

Implement a binary search tree with insertion and search operations in Swift

Implement a custom Stack data structure with O(1) minimum element retrieval

Implement a solution for finding the longest substring without repeating characters

Implement a thread-safe circular buffer in Swift

Implement a trie (prefix tree) data structure for efficient string operations

System Design

Design a scalable URL shortener service like bit.ly

Design a real-time chat system supporting millions of concurrent users

Design an Instagram-like social media feed system

Design a distributed task scheduler system

Design a distributed caching system like Redis

Design a real-time analytics processing pipeline

Design a distributed rate limiter

Design a notification delivery system

Design a distributed configuration management system

Design a distributed logging system

Coding and Debugging

Write a Swift function to check if a string is a palindrome, handling special characters and case sensitivity

Implement a function to flatten a nested array in Swift without using built-in flatten()

Create a thread-safe singleton pattern in Swift

Write a function to detect and break retain cycles in closures

Implement a custom memory leak detector using Swift

Create a concurrent map operation using DispatchGroup

Implement a custom property wrapper for UserDefaults storage

Write a function to safely unwrap multiple optionals

Implement a custom debug description protocol

Create a result builder for custom DSL implementation

Streamline Your Swift Developer Hiring

Interview Questions for Other Related Skills

Why Index.dev?

Our talent is hand-picked

We prioritize speed

We respect your budget

Top 40 Swift Coding Challenges with Solutions

AI-Powered Technical Assessment

Core Concepts

Implement a thread-safe singleton pattern in Swift

How would you implement a custom memory management solution for a cache system?

Create a protocol that implements the Observer pattern with generics

Implement a custom Result Builder for a DSL

Design a type-safe networking layer using protocols and generics

Implement a custom property wrapper for data persistence

Create a custom async sequence for pagination

Implement a type-safe dependency injection container

Create a custom SwiftUI property wrapper for validation

Implement a custom Combine operator for debouncing with timeout

Data Structures and Algorithms

Implement a thread-safe LRU Cache in Swift using generics

Implement a solution to find all pairs in an array that sum to a target value with O(n) time complexity

Implement a thread-safe Singleton pattern in Swift

Implement a sliding window algorithm to find the maximum sum subarray of size k

Implement a concurrent queue data structure in Swift

Implement a binary search tree with insertion and search operations in Swift

Implement a custom Stack data structure with O(1) minimum element retrieval

Implement a solution for finding the longest substring without repeating characters

Implement a thread-safe circular buffer in Swift

Implement a trie (prefix tree) data structure for efficient string operations

System Design

Design a scalable URL shortener service like bit.ly

Design a real-time chat system supporting millions of concurrent users

Design an Instagram-like social media feed system