Atlassian Coding & Algorithms Interview Questions
Practice the exact questions companies are asking right now.
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Filter Invalid Data Events
You are given a list of data events. Each event contains: - event_id: string - creator_id: string - event_type: string - event_time: Unix timestamp - ...
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....
Find a secret word using match feedback
You are given a list of unique words, each with the same length (e.g., 6 lowercase letters). One of these words is the secret. You can repeatedly make...
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...
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...
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 ...
Compute a moving average on a stream
Design a data structure to compute the moving average over the last N values from a stream. Input/Operations - Initialize with an integer window size ...
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...
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...
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...
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...
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 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 agent voting with average and sorting
Design an in-memory “agent voting” module that records ratings agents give to items (e.g., tickets/articles). Requirements: - Each vote is: (agentId, ...
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...
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...
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...
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 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...