ACKO Software Development Engineer II Interview Questions and Answers

1 hour , 1 medium and 1 hard
FInd Kth smallest element
Find Peak element

Q1. Parking Lot System design
Ans. 
Design a parking lot system with features like parking, unparking, and checking availability.
• Design classes for ParkingLot, ParkingSpot, Vehicle, etc.

• Implement methods for parking a vehicle, unparking a vehicle, and checking spot availability.

• Consider using data structures like HashMap or ArrayList to manage parking spots.

• Include features like ticket generation, fee calculation, and spot reservation.
Answered by AI
Add your answer

Q1. Design Search Engine
Ans. 
Design a search engine
• Consider using web crawling to index pages

• Implement a ranking algorithm like PageRank

• Include features like autocomplete and spell correction

• Support advanced search operators like boolean operators and filters
Answered by AI
Add your answer

Had to solve 2 medium level coding problems

Q1. Question on previous projects or internship
Add your answer

Basic puzzles of medium complexity level. No improvement required

DSA questions of easy level. Asked for memory optimisations.

Q1. High level system design of wallet payment system, took example of paytm. This was hld questions so just basic components
Add your answer

Q1. Low level system design of parking lot system
Ans. 
Design a parking lot system at a low level
• Divide system into components like parking spots, ticketing system, payment system

• Implement data structures like queues for managing parking spots

• Use algorithms like least recently used for spot allocation

• Consider scalability and performance in design
Answered by AI
Add your answer
Q2. Review of one of my projects at past company
Add your answer

75 min test with 18 Java theory questions

Q1. Synchronized keyword usage
Ans. 
The synchronized keyword in Java is used to control access to shared resources in a multithreaded environment.
• Synchronized keyword can be used to synchronize access to critical sections of code to prevent race conditions.

• It can be applied to methods or code blocks to ensure only one thread can access them at a time.

• Example: synchronized void myMethod() { // code }

• Example: synchronized(this) { // code }
Answered by AI
Add your answer
Q2. Message Queue types
Add your answer
Q3. Thread Contention
Add your answer
Q4. Java Profiling Tools
Add your answer
Q5. Abstract classes
Add your answer

Q1. Explain the last technically challenging topic that you have worked on. The engineering manager is only interested in self boasting. Without even trying to understand the entire problem statement, they try...read more
Add your answer

Q1. One leetcode easy-medium problem
Add your answer
Q2. Java, springboot and oops question
Add your answer

Q1. Project related questions
Add your answer
Q2. System design questions
Add your answer

Q1. Explain Concurrency
Ans. 
Concurrency is the ability of a system to execute multiple tasks simultaneously.
• Concurrency allows multiple tasks to run concurrently, improving performance and efficiency.

• Concurrency can be achieved through multithreading or multiprocessing.

• Example: A web server handling multiple requests simultaneously using multithreading.
Answered by AI
Add your answer
Q2. Explain Acid principles
Ans. 
ACID principles are a set of properties that guarantee database transactions are processed reliably.
• Atomicity: Transactions are all or nothing. If one part of the transaction fails, the entire transaction is rolled back.

• Consistency: Transactions bring the database from one valid state to another. All constraints are satisfied.

• Isolation: Transactions are isolated from each other until they are completed.

• Durability: Once...read more
Answered by AI
Add your answer