Oracle Senior Software Engineer Interview Questions and Answers for Experienced

Q1. Sort the array of 0,1,2
Ans. 
Sort an array of strings containing '0', '1', and '2'.
• Use counting sort algorithm to count the occurrences of '0', '1', and '2'.

• Create a new array based on the counts of each element.

• Return the sorted array.
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Q2. All c++ core concepts and oops concept. Find second greatest element in an array without sorting.
Ans. 
Find the second greatest element in an array without sorting using C++ concepts.
• Iterate through the array to find the greatest element.

• While iterating, keep track of the second greatest element.

• Return the second greatest element once the iteration is complete.
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Q1. Design quick ecommerce site.
Ans. 
Designing a quick ecommerce site involves creating a user-friendly interface with easy navigation and secure payment options.
• Focus on a clean and intuitive user interface

• Implement a robust search functionality for products

• Include secure payment gateways like PayPal or Stripe

• Optimize site speed for quick loading times

• Ensure mobile responsiveness for on-the-go shopping

• Integrate customer reviews and ratings for trust-buil...read more
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Q2. Consumer producer multithreading program.
Ans. 
Consumer producer multithreading program involves multiple threads sharing a common buffer to produce and consume data.
• Use synchronized data structures like BlockingQueue to handle thread synchronization.

• Implement separate producer and consumer classes with run methods.

• Use wait() and notify() methods to control the flow of data between producer and consumer threads.
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Q3. Find missing and repeating element in an array of 1 to n elements. N is the size of array. Solve in O-n time and O-1 space.
Ans. 
Find missing and repeating element in an array of 1 to n elements in O(n) time and O(1) space.
• Iterate through the array and for each element, mark the element at index equal to its value as negative. If the element is already negative, it is the repeating element.

• After marking all elements, the positive element's index + 1 is the missing element.

• Example: Array ['1', '2', '3', '3', '5'] - Repeating element is '3' and mi...read more
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Q1. What is expected compensation
Ans. 
Expected compensation should be based on industry standards, experience, skills, and location.
• Research industry standards for Senior Software Engineer salaries

• Consider your level of experience and skills

• Take into account the cost of living in the location of the job

• Negotiate based on your value to the company
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Q1. Asked about the internal implementation of hashmap, arraylist etc. and asked questions about design patterns
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Q2. Questions were specifically on Java, collections, streams, multithreading etc.
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DSA questions
1. Sort array containing only 0,1,2 as elements inplace.
2. Identify and remove linked list

DSA questions based on graphs
Asked to implement Variant of Dijikstra algorithm
Vertical order traversal
Several puzzle

Q1. LLD round Questions on work in current company Questions on projects
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Q2. Tech stack and micro services architecture in company.
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Q1. Hiring manager round HLD of google drive Advanced data structures questions General technical questions
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Q1. Longest non repeating subsequence in a string
Ans. 
Find the longest subsequence in a string without repeating characters.
• Use a sliding window approach to keep track of the characters seen so far.

• Update the start index of the window when a repeating character is encountered.

• Keep track of the longest subsequence length seen so far.
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Q2. Conceptual based on Java
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