Atlassian Coding & Algorithms Interview Questions
Practice the exact questions companies are asking right now.
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Assign tennis bookings to minimum courts
Expanding Tennis Club (Interval Scheduling) You run a tennis club with an unlimited number of courts. Each booking has a start and finish time. `text ...
Design O(1) cache and moving average
Problem You are asked two coding questions: 1) O(1) cache data structure Design a data structure that supports the following operations in O(1) averag...
Design a rating aggregator that returns totals and averages
Design and implement a simple rating system (like movie/book reviews) that supports adding ratings and querying summary statistics. Requirements Imple...
Find smallest common organization for employees
You are given an organization structure and employee-to-organization membership. Define any reasonable data structures you need. Part 1 (base) Assume ...
Implement sliding-window rate limiter function
Problem You are implementing a per-user rate limiter. Time is discretized into integer time buckets (e.g., each bucket is 1 second). You are given two...
Merge overlapping intervals
Given an array of closed intervals intervals, where each interval is [start, end] and start <= end, merge all overlapping intervals and return an arra...
Determine whether a word exists in a letter grid
Given an m x n grid of characters board and a string word, determine whether word can be constructed from sequentially adjacent cells. Rules: - Adjace...
Check if one string is a subsequence of another
Given two strings s and t, determine whether s is a subsequence of t. A subsequence keeps relative order but does not require contiguous characters. I...
Merge intervals and design rating APIs
Problem 1: Merge overlapping intervals You are given a list of closed intervals intervals, where intervals[i] = [start_i, end_i] and start_i <= end_i....
Implement sequential and parallel URL requests
You are given a list of URL strings. For each URL, send an HTTP GET request and return the responses. Output format Return a list of objects: - url: t...
Find nearest common manager for multiple employees
Given an organizational hierarchy modeled as a rooted tree, build the tree from (employee, manager) pairs and implement a function that, for k ≥ 2 emp...
Implement sliding-window rate limiter with dual thresholds
Implement getRequestStatus(urls: List[str]) -> List[str]. The i-th entry in urls represents a single incoming request at timestamp t = i seconds (t st...
Find LCA in organization tree
Question Given an organizational hierarchy tree, return the lowest common organization (parent node) for two or more employees (≥ 2). Provide unit tes...
Implement wildcard URL router
Question Implement a URL routing matcher that supports wildcard segments (e.g., '/a/*/c') using a trie. Discuss time and space complexity, show how to...
Implement snake game and find org LCA
Part A — Snake Game Engine: Implement a grid-based snake game. The board has height H and width W (0-indexed, row-major). The snake starts at (0, 0) m...
Compute inverse-depth weighted sum of a nested list
Problem You are given a nested list of integers, where each element is either: - an integer, or - a list that follows the same rule (i.e., a nested li...
Assign bookings to minimum tennis courts
You are given a list of tennis court bookings. Each booking has a start time and an end time. Task Return an assignment plan that: 1. Assigns each boo...
Find LCA in a tree and extend to a DAG
Part A — LCA variant in a rooted tree You are given a rooted tree with n nodes labeled 0..n-1. Input: - parent[i] for each node i (parent[root] = -1)....
Compute moving and weighted averages from a stream
You are processing a stream of numeric events (e.g., user activity counts). You are given a fixed window size X. Part 1: Moving average over last X va...
Design a trie-based URL router with wildcards
Implement a URL routing matcher that supports adding route patterns and matching request paths. Use a trie as the core data structure. Support static ...