Coinbase Interview Guide
18 min read Coinbase Interview Guide Company Overview: Coinbase is a leading cryptocurrency exchange platform. As a publicly-traded company (NASDAQ: COIN), it operates […] Read article
Company Guides
Company Guides
Atlassian Interview Guide
29 min read Atlassian Interview Guide Company Overview: Atlassian is known for collaboration software including Jira, Confluence, Trello, and Bitbucket. The company emphasizes Read article
Data Structures
Implement a Rate Limiter: Token Bucket, Leaky Bucket, Sliding Window
8 min read Implement a Rate Limiter: Token Bucket, Leaky Bucket, Sliding Window Rate limiting is one of the most-asked system-design topics in Read article
Bit Manipulation, String Manipulation
Parse a Boolean String Value: Truthy/Falsy Conventions
5 min read Parse a Boolean String Value: Truthy/Falsy Conventions Across Languages “Parse a string into a boolean value” sounds trivial — just Read article
Algorithms, Math Problems, String Manipulation
Print All Permutations of a String: Recursion, Backtracking, Heap Algorithm
6 min read Print All Permutations of a String: Recursion, Backtracking, and Iterative Heap’s Algorithm Generating all permutations of a string is a Read article
Algorithms, Dynamic Programming, String Manipulation
Longest palindrome in a string
2 min read Write a function to find the longest palindrome in a string. 2026 Update: Longest Palindrome — Character Frequency Approach There Read article
Dynamic Programming, Math Problems
Prime Numbers: Sieve of Eratosthenes, Trial Division, Miller-Rabin
6 min read Prime Numbers: Sieve of Eratosthenes, Trial Division, and the Miller-Rabin Test Prime number problems appear at FAANG interviews, fintech screens, Read article
Data Structures, System Design
Detect Phone Numbers Missing a Country Code: Heuristics and libphonenumber
5 min read Parse Phone Numbers Without a Country Code: Heuristic Detection “Given a list of phone numbers in mixed formats, identify which Read article
Logic Puzzles
100 Doors Puzzle: Parity, Perfect Squares, Divisor Counts
5 min read The 100 Doors Puzzle: Parity, Perfect Squares, and Why Divisor Counts Matter The 100 doors puzzle is a beautiful number-theory Read article
Coding Interview Questions
Two Eggs and an 80-Floor Building: Optimal Drop Strategy
5 min read The Two-Eggs (Light Bulbs) Problem: 80-Floor Building, Optimal Strategy, and DP “You have 2 eggs and a 100-floor building. Find Read article
Amazon Interview Questions, Arrays
Count Negative Numbers in a Sorted Matrix: Staircase Search
5 min read Count Negative Numbers in a Sorted Matrix: Staircase Search and Binary Search Counting negative numbers in a row-and-column-sorted matrix (LeetCode Read article
Coding Interview Questions
Return True with Probability p/q: Sampling Without Bias
5 min read Return True with Probability p/q: Sampling Without Bias “Given a function that returns a uniform random value, write a function Read article
Logic Puzzles
Bridge Crossing Puzzle: Four People, One Flashlight, 17 Minutes
5 min read The Bridge Crossing Puzzle: Four People, One Flashlight, 17 Minutes The bridge-crossing puzzle is a classic interview question that appears Read article
System Design
Fair Server Scheduling: Round Robin, Weighted Fair Queueing, Modern Approaches
6 min read Fair Server Scheduling: Round Robin, Weighted Fair Queueing, and Modern Approaches “Design a server that processes a fair number of Read article
Coding Interview Questions
Multiply Two Integers Without Multiplication: Russian Peasant, Bit Shifts
5 min read Multiply Two Integers Without Using Multiplication: Russian Peasant, Bit Shifts, Recursion “Multiply two integers without using the * operator” is Read article