# Mastering the Software Engineer Interview: Essential Questions and Expert Tips

## Interview Questions for the Software Engineer interview.

# Data Structures and Algorithms

## Array and Strings

How do you find the missing number in a given integer array of 1 to 100?

Write a function to reverse a string.

Given an array of integers, return indices of the two numbers such that they add up to a specific target.

## Linked Lists

Explain the difference between a singly linked list and a doubly linked list.

Write a function to detect a cycle in a linked list.

How do you reverse a linked list?

## Trees and Graphs

Explain the difference between a binary tree and a binary search tree.

Write a function to perform an inorder traversal of a binary tree.

How do you find the shortest path in a graph?

**Sorting and Searching**

Explain the difference between quicksort and mergesort.

Write a function to perform a binary search on a sorted array.

How do you sort a list of integers in ascending order?

## Dynamic Programming

What is dynamic programming, and how does it differ from recursion?

Write a function to solve the knapsack problem.

Explain the concept of memoization with an example.

# System Design

## Scalability

How would you design a URL shortening service like bit.ly?

Design a system that can handle millions of requests per second.

Explain the concept of load balancing and how it can be implemented.

## Database Design

How would you design a relational database for an e-commerce platform?

Explain the differences between SQL and NoSQL databases.

What is normalization, and why is it important in database design?

## APIs and Microservices

What is a RESTful API, and how does it work?

How would you design a microservices architecture for a social media platform?

Explain the concept of API versioning and why it is necessary.

# Coding Problems

## Simple Coding Challenges

Write a function to check if a string is a palindrome.

Implement a function that returns the Fibonacci sequence up to a given number.

Write a program to find the factorial of a number.

**Intermediate Coding Challenges**Write a function to merge two sorted linked lists.

Implement an algorithm to find the longest substring without repeating characters.

Write a function to perform matrix multiplication.

**Advanced Coding Challenges**

Implement a trie (prefix tree) and write functions for insertion and search.

Write a function to solve the traveling salesman problem using dynamic programming.

Implement a LRU (Least Recently Used) cache.

# Behavioral Questions

**Teamwork and Collaboration**

Describe a time when you had to work closely with a difficult team member.

How do you handle conflicts within a team?

Give an example of how you contributed to a project's success.

**Poblem-Solving and Decision Making**

Describe a challenging technical problem you faced and how you solved it.

How do you prioritise tasks when working on multiple projects?

Give an example of a time when you made a decision that was unpopular and how you handled it.

## Adaptability and Learning

How do you stay updated with the latest technology trends?

Describe a situation where you had to learn a new technology quickly.

How do you handle changes in project requirements?

Good luck with your interview!