22 questions · from 8 interviews
Allen Digital interview questions
Every question candidates reported from their Allen Digital interviews, most frequently asked first. Each links to the write-up it came from, so you can see the round and how it went.
Allen Digital coding and DSA questions
- 01
Word Ladder
Given a begin word, an end word, and a dictionary of allowed words, find the length of the shortest transformation sequence from begin word to end word such that only one letter can be changed at a time and each intermediate word must exist in the dictionary.…
From Allen Digital Interview Experience | SDE-2 | Cleared 3 Rounds & Ghosted
- 02
Rotting Oranges
Given a grid where each cell can be empty (0), contain a fresh orange (1), or contain a rotten orange (2), determine the minimum number of minutes that must elapse until no fresh orange remains. Each minute, any fresh orange adjacent (4‑directionally) to a…
From Allen Digital Interview Experience | SDE-2 | Cleared 3 Rounds & Ghosted
- 03
Cab Driver Billing System
You are part of a cab aggregator company, Allen Cabs, similar to Ola/Uber. As part of the Driver Billing team, you need to build a system that periodically generates bills for drivers based on the distance they've driven. Platform Capabilities: Drivers are…
- 04
Search in Rotated Sorted Array
- 05
Meeting Rooms II
- 06
Linked List: Explanation and Reversal
Explain the linked list data structure and describe how to reverse a linked list.
Easy · From Allen Digital SDE Intern Interview Experience
- 07
Heap Data Structure and Internal Implementation
Describe the heap data structure and its internal implementation.
- 08
Tree Data Structure: Explanation, Diameter, and Height
Explain the Tree data structure. Additionally, two easy questions related to trees were discussed, specifically referencing problems like finding the diameter and height of a tree.
Easy · From Allen Digital SDE Intern Interview Experience
- 09
Alien Dictionary (Graph)
Solve the Alien Dictionary problem using graph algorithms.
Hard · From Allen Digital SDE Intern Interview Experience
- 10
Online Test Proctoring System
Allen Digital is developing an online test proctoring system to monitor students during remote examinations. As part of the development team, you need to implement the core monitoring and alert system. Expectations and Guidelines: ● Time Allotted: 90 minutes…
Hard · From Allen Digital | Allen | SDE - 2 Backend | Machine coding round
- 11
Find Smallest Common Region for Locations (LCA Variant)
Given a list of locations, where each location is represented by a list of regions from specific to general (e.g., ["Bengaluru", "Bellandur", "Marathahalli"]), find the smallest area (region) that contains both Area1 and Area2. Example: Input: Locations =…
From Allen Digital | SDE3 | Banglore | December 2024 [Reject]
- 12
Maximize Pass Ratio with New Student Admissions
Allen has a few classes, each with a certain number of students and a given pass ratio (numberofstudentspassed / totalnumberofstudentsinclass). New students need to be admitted in a way that it maximises the pass ratio for Allen.
From Allen Digital | SDE3 | Banglore | December 2024 [Reject]
- 13
Design Limited Time Deals System
You are a budding entrepreneur who devised an idea to build an e-commerce giant like Amazon, Flipkart, Walmart, etc. As part of this ambition, you want to build a platform to duplicate the concept of Limited Time Deals. Limited Time Deals A limited-time deal…
- 14
3 Sum
Given an integer array nums, return all the triplets [nums[i], nums[j], nums[k]] such that i != j , i != k , and j != k , and nums[i] + nums[j] + nums[k] == 0 . Notice that the solution set must not contain duplicate triplets.
Medium · From Allen Digital Machine Coding Round | Frontend Developer | Bangalore
- 15
Merge Intervals
Given an array of intervals where intervals[i] = [starti, endi] , merge all overlapping intervals, and return an array of the non-overlapping intervals that cover all the intervals in the input.
Medium · From Allen Digital Machine Coding Round | Frontend Developer | Bangalore
Allen Digital system design questions
- 01
Rate Limiter Design
Design a rate limiter component using object‑oriented principles. The solution should be functional, extensible, and adhere to SOLID principles while handling concurrency and performance constraints.
From Allen Digital Interview Experience | SDE-2 | Cleared 3 Rounds & Ghosted
- 02
Design a Ticket Booking System
The interviewer was quite experienced. We began by discussing my previous projects and work experience. Then, I was asked to design a Ticket Booking System similar to IRCTC. Here’s what I covered: Identified and discussed core entities and their…
- 03
Design AllenFit
Design AllenFit, a platform very similar to cult.fit. The discussion covered various aspects of the system: Detailed discussion of data models. High-Level Design, exploring both Monolith and MicroService architecture approaches. Definition and discussion of…
From Allen Digital | SDE3 | Banglore | December 2024 [Reject]
- 04
Design a Vaccination Booking System
I was tasked with designing an entire Vaccination Booking System within 100 minutes. The interview included an initial and final 10-minute discussion period, leaving me with 100 minutes to both conceptualize and code the system. The interviewer provided a…
Hard · From Allen Digital | Machine Coding Interview | SDE-1 | Backend
- 05
Design Book My Show (HLD & LLD)
Design Book My Show system (HLD & LLD). Address how to handle concurrency. Define all entities and relationships among them.
Allen Digital other questions
- 01
React useContext: Explanation and Implementation
Explain the React useContext hook, including its features, and write code demonstrating its usage.
- 02
Design a Logger Library
You have to design and implement a logger library that applications can use to log messages. Clients/applications make use of your logger library to log messages to a sink. Platform Capabilities: Message: Has content which is of type string. Has a level…
From Allen Digital | SDE3 | Banglore | December 2024 [Reject]
Allen Digital interview questions FAQ
What questions are asked in Allen Digital interviews?
Candidates reported 22 distinct questions across 8 Allen Digital interviews. 15 coding and DSA questions, 5 system design questions, 2 other questions.
How difficult are Allen Digital interview questions?
Of the questions candidates rated, 29% were easy, 29% medium and 43% hard.