RadiSys Interview Questions, Process, and Tips

The coding test was for 90 mins, and comprised of questions from topics such as DP and hashtables. It was taken on hackerrank platform

Q1. One question related to hashing (particularly about hashcode and equals method)
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Q2. A variation of number of connected islands from graph
Ans. 
Count the number of connected islands in a graph
• Use Depth First Search (DFS) or Breadth First Search (BFS) to traverse the graph and mark visited nodes

• Keep track of the number of islands encountered during traversal

• An island is a group of connected 1s in a 2D grid, where '1' represents land and '0' represents water
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Q1. Thread synchronisation, print alternate numbers using 5 different threads
Ans. 
Use 5 threads to print alternate numbers with thread synchronization
• Create 5 threads, each responsible for printing a specific set of numbers

• Use mutex or semaphore to synchronize the threads

• Thread 1 prints odd numbers, Thread 2 prints even numbers, and so on

• Ensure proper handling of thread creation and synchronization

• Example: Thread 1 prints 1, 3, 5, ... Thread 2 prints 2, 4, 6, ...
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Q2. C++ Related questions were asked, in which I was asked about how can I find the size of Object, difference between malloc and calloc. What are semaphores and how are they used
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Q1. Work on Wifi issues worked in past company , 802.11 protocol specific , p2p & p2mp
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Q1. More to product line specific experience, features worked
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Q2. Customer issues , 802.11ax latest features questions, AMZ cloud issues handling customer issues
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Q1. Dbms, os, networking, c++, java
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Q1. Linkedlist questions was there
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Q1. Bit Manipulation
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Q1. Networking questions
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Based on stack implementation and struct ds . 2 Question in golang.

Was to implement simple api function using map with lock. but asked to use other ds like slice and do search.

Q1. Why relocating, changing role, etc.
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Q1. About yourself and professional Carrer
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Q2. Salary details, previous employers
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Q1. About supplier handling and solving mechanical issue
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Q2. To improve the part quality
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Q1. Yang data modelling
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Q1. Design thread safety singleton class
Ans. 
Designing a thread-safe singleton class
• Use double-checked locking to ensure thread safety

• Make the constructor private to prevent direct instantiation

• Provide a static method to access the singleton instance

• Use synchronized keyword or locks to handle concurrent access

• Consider lazy initialization or eager initialization based on requirements
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Q1. Majorly integration related questions ,4G&5G
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Q1. Personal experience discussion
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Q1. Discussion with manager
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Q1. SALARY DISCUSSION and benefits
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