Mid Backend at Cult.fit

BackendMidWithdrew◆ Commonly asked· 2025

Mid backend 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.

Best time to buy and sell stock.
MidEasy◆ Commonly asked
#array#greedy
PracticeLeetCode GeeksforGeeks
Longest consecutive sequence.
MidMedium◆ Commonly asked
#hashmap#array
PracticeLeetCode GeeksforGeeks
Sliding window maximum.
MidHard◆ Commonly asked
#deque#sliding-window
PracticeLeetCode GeeksforGeeks

Round 02 · 2 questions

Machine Coding

Build a working component or service under time pressure.

Build a background job runner with priorities.
MidMedium◆ Commonly asked
#queue#workers
PracticeGeeksforGeeks Search
Implement an idempotent "charge" endpoint.
MidHard◆ Commonly asked
#idempotency#payments
PracticeGeeksforGeeks Search

Round 03 · 1 question

Low-Level Design

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

Design an in-memory file system.
MidHard◆ Commonly asked
#oop#trees
PracticeGeeksforGeeks Search

Round 04 · 3 questions

Tech Deep-Dive

Deep questions on your core stack and fundamentals.

How does a write-ahead log guarantee durability?
MidHard◆ Commonly asked
#databases
PracticeGeeksforGeeks Search
How do you run a zero-downtime database migration?
MidHard◆ Commonly asked
#databases
PracticeGeeksforGeeks Search
Caching strategies: cache-aside, write-through, TTLs.
MidMedium◆ Commonly asked
#cache
PracticeGeeksforGeeks Search

Round 05 · 2 questions

Behavioral / HR

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

Describe a time you had to deliver bad news.
Mid◆ Commonly asked
#communication#star
Tell me about a time you simplified something overly complex.
Mid◆ Commonly asked
#judgment#star

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