Atlassian Coding Interview Questions
25 Atlassian coding interview problems with full optimal solutions — 4 easy, 18 medium, 3 hard. Every problem ships with multiple approaches (brute-force first, then the optimal), complexity tables for each, company-specific tips on what an Atlassian interviewer values, and a FAQ section.
Showing 4 problems of 25
- #1easyfoundational
1. Two Sum
Two Sum is Atlassian's canonical phone-screen warm-up: given an integer array and a target, return the indices of the two numbers that add to the target. Atlassian uses it to confirm you can code and articulate the brute-to-optimal tradeoff before a harder graph or design follow-up.
3 free resourcesSolve → - #20easyfoundational
20. Valid Parentheses
Valid Parentheses is Atlassian's stack-introduction warm-up. Given a string containing only the characters '()', '[]', and '{}', determine if the input is properly matched. Atlassian uses it to check you know when to reach for a stack before pivoting to a harder parsing question.
3 free resourcesSolve → - #121easyfoundational
121. Best Time to Buy and Sell Stock
Best Time to Buy and Sell Stock is an Atlassian warm-up that tests whether you notice the linear single-pass pattern. Given an array of daily prices, return the maximum profit from one buy then one sell. The trap is brute-forcing every (buy, sell) pair when one pass suffices.
4 free resourcesSolve → - #206easyfoundational
206. Reverse Linked List
Reverse Linked List is Atlassian's pointer-manipulation warm-up. Given the head of a singly linked list, reverse the list and return the new head. The grading focus is correct three-pointer rewiring without dropping nodes or creating cycles.
4 free resourcesSolve →
Related interview-prep guides
Codility for Tech Interviews in 2026: The Complete Guide for Candidates
Codility is the dominant algorithmic-assessment platform across European tech hiring. Heavy in the UK, Germany, Netherlands, Nordics, and Poland where the company was founded. It scores candidates on both correctness and time complexity, runs 60-to-120-minute timed tests, and ships three products: Tests, CodeCheck, and CodeLive. This guide is what 2026 candidates need to know.
Karat Technical Interview Guide 2026: How the Third-Party Loop Actually Works
Karat is technical-interview-as-a-service. Karat-employed engineers run the technical loop for the hiring company in Karat's own recorded video and coding environment. The dynamic is different from an in-house interview: the interviewer is a contractor, not a future teammate, the rubric is fixed, the session is recorded for asynchronous review, and the hiring team's engineers watch the playback a day later. This guide is the practical map of how that loop works in 2026 and how a modern desktop setup runs alongside it.
CodeInterview.io Live Coding Interview Guide (2026): What the Platform Tracks and How to Walk Through It Cleanly
CodeInterview.io is a browser-based collaborative live-coding platform. Think of it as a lighter-footprint alternative to CoderPad with an integrated video call, per-keystroke replay, and a drawing whiteboard. Smaller market share than CoderPad but shows up at a meaningful slice of YC startups and mid-market tech teams in 2026. This is what CodeInterview.io tracks, how its all-in-one workflow compares to CoderPad, and how a modern desktop AI setup pairs with it without showing up in the screen-share.