Pixis Software Developer Interview Questions and Answers

Computer Fundamentals

Q1. Flatten a binary tree
Ans. 
Flatten a binary tree by converting it into a linked list in-place.
• Use a recursive approach to flatten the binary tree.

• Traverse the tree in a pre-order manner and keep track of the previous node.

• Set the left child of each node to null and the right child to the next node in the linked list.

• Example: Input: 1 -> 2 -> 5 -> 3 -> 4 -> null, Output: 1 -> null -> 2 -> null -> 3 -> null -> 4 -> null -> 5 -> null
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Solving normal Puzzles to test aptitude.

Sample app was asked to create.

They have their own coding platform. The questions are basically from tree.

Tree of space question

Q1. Previous round question solution
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Q2. System design was asked.
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Leecode medium level question

Leetcode Hard level Question

Q1. This is cto round asked some interview questions
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That would be online Test with 12 questions MCQ and 1 coding question. 12 MCQ questions would be related to technology and bascis, coding question would alos be basic

Q1. All Technical related, mostly related to swift ARC, Queues, Threading, unit test cases
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Q2. Concepts of memory ARC in Swift
Ans. 
Memory ARC in Swift manages memory by automatically deallocating objects when they are no longer needed.
• ARC stands for Automatic Reference Counting

• ARC keeps track of how many references exist to an object

• When the reference count drops to zero, the object is deallocated

• Weak references are used to avoid retain cycles
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Q3. Generics in Swift
Ans. 
Generics in Swift allow you to write flexible, reusable functions and types that can work with any type.
• Generics enable you to write functions and types that can work with any type, without specifying the actual type until the function or type is used.

• You can define generic functions, methods, classes, structures, and enumerations in Swift.

• Example: func swapTwoValues(_ a: inout T, _ b: inout T) { let temp = a; a = b; b...read more
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Q4. MVC vs MVVM in swift
Ans. 
MVC focuses on separating data, presentation, and user interaction, while MVVM adds a ViewModel to handle logic and data binding.
• MVC stands for Model-View-Controller, where the controller handles user input, the model manages data, and the view displays the data. Example: UIKit in iOS development.

• MVVM stands for Model-View-ViewModel, where the ViewModel acts as an intermediary between the model and view, handling data ...read more
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Q5. Optionals, Protocols and Delegates, LifeCycle
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An app with Login screen with authentication in MVVM

Kadance algorithm and find the middle of the linklist

More on java and Python based coding questions

Q1. Behavioural questions were asked
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Q2. What are your expectations from this job
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Q3. What are your plans ahead
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Q4. Where do you see yourself in 5 years ahead
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3 Graph Questions Were asked of difficulty medium to hard.

Hackathon round which revolved around multithreading