Mid Frontend at Dropbox

FrontendMidRejected◆ Commonly asked· 2023

Mid frontend interview. Coding-heavy early, design and behavioral later.

The loop · 5 rounds

Round 01 · 3 questions

DSA / Coding

Data structures & algorithms on a whiteboard or shared editor.

Subsets.
MidMedium◆ Commonly asked
#backtracking
PracticeLeetCode GeeksforGeeks
Construct binary tree from preorder and inorder traversal.
MidMedium◆ Commonly asked
#tree#recursion
PracticeLeetCode GeeksforGeeks
Minimum window substring.
MidHard◆ Commonly asked
#sliding-window#string
PracticeLeetCode GeeksforGeeks

Round 02 · 2 questions

Machine Coding

Build a working component or service under time pressure.

Build an accessible accordion with single/multi open.
MidMedium◆ Commonly asked
#react#a11y
PracticeGeeksforGeeks Search
Build a "connect four" game with win detection.
MidMedium◆ Commonly asked
#react#state
PracticeGeeksforGeeks Search

Round 03 · 1 question

Low-Level Design

Object-oriented / low-level design of a focused module.

Design a toast/notification manager API.
MidMedium◆ Commonly asked
#oop#pub-sub
PracticeGeeksforGeeks Search

Round 04 · 3 questions

Tech Deep-Dive

Deep questions on your core stack and fundamentals.

How does React batching and the render phase work?
MidHard◆ Commonly asked
#react
PracticeGeeksforGeeks Search
What causes layout thrashing and how do you avoid it?
MidHard◆ Commonly asked
#perf#dom
PracticeGeeksforGeeks Search
Explain the difference between == and === and coercion.
MidEasy◆ Commonly asked
#javascript
PracticeGeeksforGeeks Search

Round 05 · 2 questions

Behavioral / HR

Values, collaboration, and past-experience (STAR) questions.

When did you take ownership of something outside your scope?
Mid◆ Commonly asked
#ownership#star
Describe a disagreement on a code review and how it ended.
Mid◆ Commonly asked
#conflict#star

◆ This experience is composed from commonly reported questions for this role and level. Real, individually-shared interviews will be layered in over time.