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.
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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
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Had to solve 2 medium level coding problems

Q1. Question on previous projects or internship
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Write code for advance surrying in js

Implement custom hook for api call

Q1. Basic questions arounf my previous work
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Q2. Technical questions around performance and code optimization
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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
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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
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Q2. Review of one of my projects at past company
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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 }
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Q2. Message Queue types
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Q3. Thread Contention
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Q4. Java Profiling Tools
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Q5. Abstract classes
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Q1. Tell me about one project you worked on?
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Q2. Tell me about yourself?
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Basic DSA and android questions

Live coding round for android

Q1. Explain your past experiences?
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