Design Patterns Interview Questions: GoF Patterns with Code Examples (2025)
Design pattern questions test whether you can recognize common structural and behavioral problems and apply established solutions. Interviewers at Google, […]
Algorithms
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Algorithms
Master fundamental and advanced algorithms essential for technical interviews at top companies. This category covers sorting algorithms, search algorithms, graph algorithms, and optimization techniques that form the foundation of computer science problem-solving.
What You’ll Learn:
Sorting algorithms: Quick sort, merge sort, heap sort
Search techniques: Binary search and variations
Graph algorithms: DFS, BFS, Dijkstra’s, topological sort
Optimization: Dynamic programming, greedy algorithms
Time and space complexity analysis
Difficulty Progression: Start with basic sorting and searching, then progress to graph algorithms and dynamic programming.
Interview Frequency: Extremely high – algorithms appear in 80%+ of technical interviews at Google, Amazon, Facebook, Microsoft, and Apple.
Algorithms
Docker and Kubernetes Interview Questions (2025)
Docker and Kubernetes questions appear in backend, DevOps, platform engineering, and SRE interviews. Interviewers expect you to understand containers at
Algorithms
Concurrency and Multi-Threading Interview Questions (2025)
Concurrency questions appear at almost every senior engineering interview. Interviewers test whether you can reason about race conditions, design thread-safe
Algorithms
TypeScript Interview Questions: Types, Generics, and Advanced Patterns (2025)
TypeScript has become the default choice for large-scale JavaScript projects. Interviews for frontend, full-stack, and Node.js roles routinely include TypeScript
Algorithms
SQL Interview Questions: Joins, Window Functions, and Query Optimization (2025)
SQL is tested in almost every data engineering, analytics engineering, backend, and data science interview. Questions range from writing a
Algorithms
C++ Interview Questions: Memory, Concurrency, and Modern C++ (2025)
C++ interviews go deeper than most language interviews — interviewers expect you to understand memory management, the object lifecycle, undefined
Algorithms
Sliding Window and Two Pointers: Interview Patterns and Problems
Sliding window and two pointers are among the most powerful patterns for array and string problems. Recognizing when to apply
Algorithms, Math Problems, String Manipulation
Print String Permutations
How will you print all permutations of characters in a string? 2026 Update: String Permutations — Three Approaches and the
Algorithms, Dynamic Programming, String Manipulation
Longest palindrome in a string
Write a function to find the longest palindrome in a string. 2026 Update: Longest Palindrome — Character Frequency Approach There
Algorithms, Dynamic Programming, String Manipulation
Find Longest Palindrome In A String
How will you find out the longest palindrome in a given string. 2026 Update: Longest Palindromic Substring — Expand Around
Algorithms, Data Structures
Check if a Linked list is a Palindrome or Not
Write code that will check if a linked list is a palindrome or not. 2026 Update: Linked List Palindrome —
Algorithms, Data Structures
Reverse a doubly linked list
How can you reverse a double linked list? 2026 Update: Reversing a Doubly Linked List — Full Implementation Reversing a
Algorithms, Arrays, Data Structures
Right Rotate an array by k elements
An array of elements is given arr arr is of length n Right rotate array by k elements Time complexity
Algorithms, Arrays, Brain Teasers, Data Structures, String Manipulation
Reverse a String
A typical programming interview question is “reverse a string, in place”. if you understand pointers, the solution is simple. even
Algorithms, Brain Teasers, Logic Puzzles
Bumblebee
problem: two trains enter a tunnel 200 miles long (yeah, its a big tunnel) travelling at 100 mph at the