Atlassian

5 design problems known to be asked at Atlassian.

Easy1

Easylow level design design patterns oop

Adapter Pattern: Make Two Interfaces That Weren't Built to Talk, Talk

Your code expects one interface; the useful class only speaks another — and you can't edit either. Adapter is the thin impedance-matching layer that lets them work together without a rewrite.

Asked at Amazon, Stripe, Uber +2

Aug 8, 2026·16 min read

Medium3

Mediumlow level design design patterns oop

Command Pattern: Make a Request Something You Can Hold in Your Hand

A method call happens once and is gone. Turn that request into an object with execute() and undo(), and suddenly you can queue it, log it, retry it, and reverse it — the backbone of undo/redo, job queues, and transactional replay.

Asked at Amazon, Google, Microsoft +3

Aug 8, 2026·15 min read

Mediumlow level design design patterns oop

Mediator Pattern: Turn a Mesh of Dependencies Into a Star

When every object holds a reference to every other, change becomes impossible — an O(N²) tangle where one edit ripples everywhere. The Mediator pulls the wiring into one place so components can stay gloriously ignorant of each other.

Asked at Google, Microsoft, Meta +3

Aug 8, 2026·15 min read

Mediumlow level design design patterns oop

Memento Pattern: Undo Without Cracking the Object Open

Every undo, savepoint, and game save has the same problem — capture an object's private state so you can restore it later, without letting the thing holding the snapshot read or corrupt what's inside.

Asked at Microsoft, Google, JetBrains +3

Aug 8, 2026·14 min read

Hard1

Hardlow level design design patterns oop

Interpreter Pattern: When Your Config Grows a Grammar

Feature-flag rules, search filters, and pricing conditions all quietly become little languages. The Interpreter pattern turns that grammar into a tree of classes that evaluate themselves — and tells you exactly when to stop and reach for a real parser instead.

Asked at Google, Amazon, Microsoft +2

Aug 8, 2026·15 min read