Phenom Product Development Engineer Interview Questions, Process, and Tips

Q1. Basic java and spring boot
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Q2. Design principles
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Q1. LRU cache program
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LRU cache program is a data structure that stores the most recently used items.
• LRU cache is typically implemented using a doubly linked list and a hashmap.

• When a new item is accessed, it is moved to the front of the list.

• If the cache is full, the least recently used item is removed from the end of the list.

• Example: If the cache has a capacity of 3 and items A, B, C are accessed in that order, the cache will store C, B,...read more
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Q2. DBMS Locking exmple with a scenario
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DBMS locking is a mechanism to manage concurrent access to data in a database to prevent data corruption.
• Locking is used to ensure data integrity and consistency in a multi-user environment.

• Types of locks include shared locks, exclusive locks, and update locks.

• Example scenario: Two users trying to update the same record simultaneously - one user gets an exclusive lock while the other waits.

• Deadlocks can occur when two ...read more
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Q1. Advantages of async and threading and their scope.
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Async and threading offer advantages in improving performance and responsiveness in software development.
• Async allows for non-blocking operations, improving responsiveness by allowing other tasks to continue while waiting for a response.

• Threading enables parallel execution of tasks, utilizing multiple CPU cores to improve performance.

• Async is more suitable for I/O-bound operations, while threading is better for CPU-bou...read more
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Q2. Two sum leetcode model
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Given an array of integers, return indices of the two numbers such that they add up to a specific target.
• Use a hashmap to store the difference between the target and each element as keys and their indices as values.

• Iterate through the array and check if the current element's complement exists in the hashmap.

• Return the indices of the two numbers that add up to the target.
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Q1. Explain about Global interpreter lock.
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Global Interpreter Lock (GIL) is a mutex that protects access to Python objects, preventing multiple threads from executing Python bytecodes simultaneously.
• GIL is a mechanism used in CPython to ensure that only one thread executes Python bytecode at a time.

• It prevents multiple threads from executing Python code concurrently, which can cause issues with thread safety.

• GIL can impact the performance of multi-threaded Pyth...read more
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Q2. Integer to roman, sort an array containing only 0,1,2 in single iteration.
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Use two pointers to swap 0s to the beginning and 2s to the end while keeping 1s in the middle.
• Initialize two pointers, one for 0s (left) and one for 2s (right).

• Iterate through the array and swap 0s to the left pointer and 2s to the right pointer.

• Example: Input array = ['2', '1', '0', '2', '1', '0'], Output array = ['0', '0', '1', '1', '2', '2']
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Q1. General questions on aws, and resume.
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Q2. Coding question on two pointer, three pointer and sliding window techniques
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Q1. General interaction about company previous experience and negotiations
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Q1. Questions were about previous projects challenges and how did you solve them Secnario based questions , problem solving skills and thought process and critical thinking
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How can implement a queue

Q1. How can swap the numbers without using the third variable
Ans. 
To swap numbers without using a third variable, use arithmetic operations.
• Add the two numbers to get the first number

• Subtract the second number from the sum to get the second number

• Subtract the original first number from the sum to get the original second number
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