# Software Engineer
**Role:** Software Engineer · **Level:** Senior Engineer 3
**Company:** [Commvault](https://scaleengineer.com/companies/commvault)
**Difficulty:** Hard
**Salary:** US$140000 - US$180000
**Experience:** 5 - 10
**Timeline:** ~14 days
Commvault is seeking a Senior Engineer 3 with a strong background in software development, problem-solving, and system design. This role involves contributing to the design, development, and maintenance of our cutting-edge data protection and information management solutions. The interview process is designed to assess technical expertise, problem-solving abilities, and cultural fit within our collaborative environment.
Canonical: https://scaleengineer.com/interviews/commvault/senior-engineer-3-software-engineer
---
## Overall evaluation

- Technical Skills
- Communication
- Experience and Problem Solving
- Behavioral and Cultural Fit

## Questions asked

- Design a URL shortening service.
- How would you design a distributed cache?
- Explain the CAP theorem and its implications.
- Describe a time you had to deal with a production outage.
- What are the trade-offs between monolithic and microservices architectures?
- How do you ensure data consistency in a distributed system?
- Write a function to find the kth largest element in an unsorted array.
- Discuss your experience with performance tuning.
- How do you approach code reviews?
- What are your thoughts on test-driven development (TDD)?

## Preparation tips

### lists

- Review core computer science concepts (data structures, algorithms, operating systems, databases).
- Familiarize yourself with Commvault's products and solutions.
- Practice coding problems, focusing on efficiency and clarity.
- Prepare to discuss your past projects and technical challenges in detail.
- Research common interview questions for senior software engineering roles.
- Understand distributed systems concepts and design patterns.
- Be ready to discuss your experience with cloud technologies.
- Prepare behavioral examples using the STAR method (Situation, Task, Action, Result).

### studyPlan

- {"title":"Data Structures and Algorithms","longDescription":"Weeks 1-2: Focus on Data Structures and Algorithms. Cover arrays, linked lists, trees, graphs, hash tables, sorting, searching, dynamic programming, and greedy algorithms. Practice problems on platforms like LeetCode and HackerRank, aiming for optimal solutions.","shortDescription":"Weeks 1-2: Data Structures & Algorithms (LeetCode/HackerRank)"}
- {"title":"System Design","longDescription":"Weeks 3-4: System Design. Study concepts like scalability, availability, reliability, consistency, load balancing, caching, databases (SQL vs. NoSQL), message queues, and microservices architecture. Review common system design interview questions and case studies.","shortDescription":"Weeks 3-4: System Design Principles & Case Studies"}
- {"title":"Cloud and Product Knowledge","longDescription":"Week 5: Cloud Technologies and Commvault Products. Gain a solid understanding of major cloud providers (AWS, Azure, GCP) and their core services. Research Commvault's product suite, including backup, recovery, and data management solutions.","shortDescription":"Week 5: Cloud Platforms & Commvault Products"}
- {"title":"Behavioral and Communication","longDescription":"Week 6: Behavioral and Communication Skills. Prepare specific examples using the STAR method for common behavioral questions related to teamwork, problem-solving, leadership, and conflict resolution. Practice articulating your thoughts clearly and concisely.","shortDescription":"Week 6: Behavioral Questions & STAR Method"}

## Location differences

- {"location":"North America","differences":{"tips":["Be prepared to discuss specific examples of large-scale systems you've worked on.","Highlight any experience with performance optimization and scalability challenges.","Showcase your understanding of cloud architecture patterns.","Emphasize your ability to mentor junior engineers."],"interviewFocus":["Deep dive into distributed systems design.","Experience with large-scale data processing.","Proficiency in cloud-native technologies.","Leadership and mentorship capabilities."],"commonQuestions":["Discuss a complex technical challenge you faced and how you overcame it.","How do you approach designing a scalable distributed system?","Describe your experience with cloud platforms (AWS, Azure, GCP).","What are your thoughts on microservices architecture?","How do you ensure code quality and maintainability?"]}}
- {"location":"Europe","differences":{"tips":["Brush up on data structures and algorithms.","Be ready to write code on a whiteboard or shared editor.","Demonstrate a clear understanding of software design patterns.","Articulate your thought process clearly when solving problems."],"interviewFocus":["Strong foundation in core computer science principles.","Proficiency in specific programming languages (e.g., C++, Java, Python).","Problem-solving and algorithmic thinking.","Experience with software development lifecycle."],"commonQuestions":["Explain the principles of object-oriented design.","How do you handle concurrency in your applications?","Describe your experience with database design and optimization.","What are the trade-offs between different caching strategies?","How do you approach debugging complex issues?"]}}
- {"location":"Asia","differences":{"tips":["Provide examples of successful collaboration and conflict resolution.","Showcase your ability to communicate technical concepts to non-technical stakeholders.","Express enthusiasm for learning and growth.","Research Commvault's mission and values."],"interviewFocus":["Teamwork and collaboration skills.","Communication and influencing abilities.","Adaptability and continuous learning.","Alignment with Commvault's company culture and values."],"commonQuestions":["How do you collaborate with cross-functional teams?","Describe a time you had to influence a technical decision.","What are your strategies for managing technical debt?","How do you stay updated with the latest technology trends?","What are your career aspirations?"]}}

## Round 1: Technical Screening - Coding
**Type:** Technical Screening · **Difficulty:** Medium · **Duration:** 45 min
Coding and problem-solving assessment.
This initial round focuses on assessing fundamental programming skills and problem-solving abilities. You will be asked to solve coding problems, typically involving data structures and algorithms, on a shared editor or whiteboard. The interviewer will evaluate your approach, code quality, efficiency, and ability to communicate your thought process.
**Interviewers look for:** Clean, well-structured, and efficient code.; A systematic approach to problem-solving.; Ability to explain the logic behind the solution.; Consideration of edge cases and constraints.
**Evaluation criteria:** Coding proficiency; Problem-solving approach; Understanding of data structures and algorithms; Code clarity and efficiency
**Common rejection reasons:** Inability to articulate thought process.; Lack of fundamental programming knowledge.; Poorly structured or inefficient code.; Failure to consider edge cases.
## Questions

- Given a binary tree, invert the tree.
- Find the first non-repeating character in a string.
- Implement a function to check if a linked list has a cycle.

## Preparation tips

- Practice coding problems regularly.
- Focus on understanding the time and space complexity of your solutions.
- Be prepared to explain your code line by line.
- Think out loud and communicate your approach before coding.

## Round 2: System Design Interview
**Type:** System Design · **Difficulty:** Hard · **Duration:** 60 min
Designing scalable and distributed systems.
This round delves into your ability to design complex, scalable, and reliable systems. You will be presented with a high-level problem (e.g., design a social media feed, a URL shortener, or a distributed key-value store) and expected to architect a solution, discussing various components, trade-offs, and potential bottlenecks.
**Interviewers look for:** A structured approach to system design.; Deep understanding of distributed systems concepts.; Ability to justify design choices and trade-offs.; Consideration of various components like databases, caching, load balancing, etc.; Experience with cloud platforms and services.
**Evaluation criteria:** System design capabilities; Understanding of scalability, availability, and reliability; Knowledge of distributed systems concepts; Ability to analyze trade-offs; Experience with relevant technologies
**Common rejection reasons:** Lack of understanding of distributed systems principles.; Inability to design scalable and reliable systems.; Poor trade-off analysis.; Not considering failure scenarios.
## Questions

- Design a system like Twitter's news feed.
- Design a rate limiter.
- How would you design a distributed message queue?

## Preparation tips

- Study common system design patterns.
- Understand concepts like load balancing, caching, database sharding, replication, and message queues.
- Practice designing systems for scale and high availability.
- Be prepared to discuss your experience with cloud platforms.
- Think about failure modes and how to mitigate them.

## Round 3: Behavioral and Managerial Interview
**Type:** Behavioral Interview · **Difficulty:** Medium · **Duration:** 45 min
Assessing behavioral competencies and cultural fit.
This round focuses on your behavioral aspects, past experiences, and how you fit into the team and company culture. You'll be asked questions about your strengths, weaknesses, how you handle specific situations (e.g., conflict resolution, dealing with failure), and your career aspirations. Use the STAR method to provide concrete examples.
**Interviewers look for:** Examples of teamwork and collaboration.; How you handle challenges and conflicts.; Your approach to learning and growth.; Alignment with Commvault's values.; Enthusiasm and passion for technology.
**Evaluation criteria:** Behavioral competencies; Teamwork and collaboration; Problem-solving approach in past experiences; Communication skills; Cultural alignment with Commvault
**Common rejection reasons:** Poor communication skills.; Lack of collaboration.; Inability to provide specific examples.; Negative attitude or lack of enthusiasm.; Poor cultural fit.
## Questions

- Tell me about a time you disagreed with a teammate. How did you resolve it?
- Describe a challenging project you worked on and how you overcame obstacles.
- What are your strengths and weaknesses?

## Preparation tips

- Prepare examples for common behavioral questions using the STAR method.
- Research Commvault's mission, values, and culture.
- Be ready to discuss your career goals and why you're interested in this role.
- Show enthusiasm and a positive attitude.
- Ask thoughtful questions about the team and the role.