Lumen Technologies Senior Software Engineer Interview Questions and Answers

Q1. A string contains parenthesis, curly brackets and square brackets. Check if the string is valid or not.
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Dsa and pointer and logical .

Tree and LL and graphs.

Q1. How will you solved problems
Ans. 
I approach problems methodically by breaking them down, analyzing root causes, brainstorming solutions, and testing them.
• Break down the problem into smaller, manageable parts

• Analyze the root causes of the problem

• Brainstorm potential solutions

• Test and iterate on the solutions until the problem is resolved
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Q2. How will you manage workload
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I will manage workload by prioritizing tasks, setting realistic deadlines, delegating when necessary, and regularly reviewing progress.
• Prioritize tasks based on deadlines and importance

• Set realistic deadlines and milestones

• Delegate tasks to team members when necessary

• Regularly review progress and adjust workload as needed
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Q1. Work related discussion session.
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Q1. Pick one question from 3 given questions and complete it in 7 days. I opted for creating traingle with opengl using shader.
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Data structures and algorithms
Problem were from leetcode and geek for geeks.

Q1. Data structures and algorithms
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Q1. Design and algorithms
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Coding round , questions from leetcode

Situation based questions and thought process

Q1. Managerial round 1, culture fit, behaviour
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Q2. Managerial round 2, innovative things done previously, how to face criticism, does experience matters in learning from subordinate
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Q1. Basically related to SIP Protocol. IMS call flows . CLOUD Knowledge
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Q2. Deployment Process IMS ARCHITECTURE LTE ARCHITECTURE
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Q3. DIAMETER PROTOCOL SDP PROTOCOL
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45 mins, 3 coding questions in any language about Data structures

Q1. Basic technical questions
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Technical questions, over an hour

Q1. Basic HR questions like your strengths and weakness, they test your leadership skills, extra curricular activities
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Q1. Make Kanbon board in react live coding
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Q2. Write unit testing for the same
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Q1. Find the memory of the given structure (Struct padding is the hint)
Ans. 
The question asks to find the memory of a given structure by considering struct padding.
• Struct padding refers to the unused bytes added to align the members of a structure.

• To find the memory of a structure, we need to consider the size of each member and the padding added.

• The total memory of a structure is the sum of the sizes of its members and the padding.
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Q2. Write code to find the position of a number in a BST
Ans. 
Code to find the position of a number in a BST
• Implement a recursive function to traverse the BST

• Compare the target number with the current node value

• If the target is smaller, go to the left subtree; if larger, go to the right subtree

• Repeat until the target is found or the subtree is null
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Q3. Create a Trie data structure and perform insertion and search on it.
Ans. 
A Trie is a tree-like data structure used for efficient retrieval of strings. It supports insertion and search operations.
• A Trie is also known as a prefix tree.

• Each node in the Trie represents a character.

• The root node represents an empty string.

• Each node can have multiple children, each representing a different character.

• Insertion involves traversing the Trie and creating new nodes as needed.

• Search involves traversing...read more
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Q1. Regarding Java memory management
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Q1. Regarding RMI process
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