Interview Prep

Junior

• What is the difference between value types and reference types in C#?
  Concepts Very frequent C# memory types
• Find all duplicate integers in an array in O(n) time
  Coding Frequent C# arrays HashSet
• Tell me about a time you worked through a difficult bug or exception
  Behavioural Frequent debugging concurrency async
• What is the difference between an interface and an abstract class in C#?
  Concepts Very frequent C# interface abstract class
• What is boxing and unboxing in C#, and why is it a performance concern?
  Concepts Frequent C# boxing unboxing
• Two Sum — return indices of two numbers that add up to a target
  Coding Very frequent C# arrays Dictionary
• Check if a string is a palindrome (ignoring case and non-alphanumeric characters)
  Coding Frequent C# two pointers strings
• Tell me about a time you explained a technical decision to a non-technical stakeholder
  Behavioural Frequent C# communication STAR method