# Grade 10
**Role:** Software Engineer · **Level:** Software Engineer IV
**Company:** [Cisco](https://scaleengineer.com/companies/cisco)
**Difficulty:** Hard
**Salary:** US$140000 - US$180000
**Experience:** 6 - 10
**Timeline:** ~21 days
This interview process is for a Software Engineer IV position at Cisco, focusing on assessing a candidate's technical expertise, problem-solving abilities, and cultural fit within the company. The process is designed to evaluate candidates for a senior role, expecting a high level of proficiency and experience.
Canonical: https://scaleengineer.com/interviews/cisco/software-engineer-iv-software-engineer
---
## Overall evaluation

- Technical Proficiency
- Problem Solving & Analytical Skills
- System Design & Architecture
- Communication & Collaboration
- Leadership & Mentorship

## Questions asked

- Design a URL shortening service like TinyURL.
- Implement a rate limiter.
- Explain the CAP theorem and its implications.
- How would you design a system to count unique visitors to a website?
- Describe a situation where you had to deal with a difficult stakeholder. How did you handle it?
- What are the trade-offs between monolithic and microservices architectures?
- How do you ensure data consistency across multiple services?
- Write a function to find the k-th largest element in an unsorted array.
- Discuss your experience with asynchronous programming.
- How would you optimize a slow database query?
- Tell me about a time you failed. What did you learn from it?
- Design a distributed message queue.
- What are the principles of RESTful API design?
- How do you approach code reviews?
- Describe a complex bug you encountered and how you debugged it.

## Preparation tips

### lists

- Review fundamental computer science concepts, including data structures, algorithms, and operating systems.
- Practice coding problems on platforms like LeetCode, HackerRank, focusing on medium to hard difficulty.
- Study system design principles and common patterns for building scalable applications.
- Prepare to discuss your past projects in detail, highlighting your contributions and technical decisions.
- Research Cisco's products, services, and company culture.
- Practice behavioral questions using the STAR method (Situation, Task, Action, Result).
- Understand distributed systems concepts, including concurrency, consistency, and fault tolerance.
- Familiarize yourself with cloud computing concepts and technologies if relevant to the role.

### studyPlan

- {"title":"Data Structures and Algorithms","longDescription":"Weeks 1-2: Focus on core data structures (arrays, linked lists, trees, graphs, hash tables) and algorithms (sorting, searching, dynamic programming, graph traversal). Practice implementing these in your preferred language and analyze their time and space complexity. Solve at least 20 medium-difficulty problems per week.","shortDescription":"Weeks 1-2: Data Structures & Algorithms fundamentals. Practice 40+ medium problems."}
- {"title":"System Design","longDescription":"Weeks 3-4: Dive into system design. Study concepts like load balancing, caching, databases (SQL vs. NoSQL), message queues, and microservices architecture. Work through common system design interview questions and practice drawing architecture diagrams. Read relevant blogs and case studies.","shortDescription":"Weeks 3-4: System Design principles. Study load balancing, caching, databases, microservices. Practice design questions."}
- {"title":"Behavioral and Leadership","longDescription":"Week 5: Focus on behavioral questions and leadership. Prepare examples using the STAR method for common questions related to teamwork, conflict resolution, handling failure, and leadership. Reflect on your career experiences and identify key achievements.","shortDescription":"Week 5: Behavioral questions & STAR method. Prepare leadership examples."}
- {"title":"Review and Mock Interviews","longDescription":"Week 6: Review and mock interviews. Consolidate your knowledge, revisit weak areas, and conduct mock interviews with peers or mentors. Focus on articulating your thought process clearly and managing your time effectively during interviews.","shortDescription":"Week 6: Review, mock interviews, and time management practice."}

## Location differences

- {"location":"San Jose, USA","differences":{"tips":["Be prepared to discuss specific examples of large-scale systems you've worked on.","Highlight instances where you've influenced technical direction or mentored others.","Showcase your understanding of scalability, reliability, and performance optimization.","Familiarize yourself with Cisco's specific technology stack and products if possible."],"interviewFocus":["Deep dive into system design and distributed systems.","Emphasis on leadership and mentorship capabilities.","Assessment of experience with large-scale production environments.","Understanding of cloud-native architectures and best practices."],"commonQuestions":["How would you design a distributed caching system for a large-scale web application?","Describe a complex technical challenge you faced and how you overcame it.","Discuss your experience with cloud platforms like AWS, Azure, or GCP.","How do you ensure code quality and maintainability in a large codebase?","What are your strategies for mentoring junior engineers?"]}}
- {"location":"Bangalore, India","differences":{"tips":["Prepare to walk through your thought process for debugging complex issues.","Be ready to discuss your contributions to CI/CD implementation.","Demonstrate your ability to work effectively in a team and resolve disagreements constructively.","Research common challenges in the specific domain Cisco operates in for this region."],"interviewFocus":["Focus on practical problem-solving and debugging skills.","Assessment of experience with microservices and distributed systems.","Evaluation of understanding in CI/CD and DevOps practices.","Emphasis on collaboration and communication skills."],"commonQuestions":["Explain the trade-offs between different database technologies (SQL vs. NoSQL).","How would you approach debugging a performance issue in a microservices architecture?","Describe your experience with CI/CD pipelines and automation.","What are the key principles of secure software development?","How do you handle conflicting technical opinions within a team?"]}}
- {"location":"London, UK","differences":{"tips":["Be ready to draw diagrams and explain your system designs clearly.","Highlight your experience with containerized deployments and management.","Showcase your proactive approach to learning and adopting new technologies.","Understand the specific market needs and technological landscape relevant to this location."],"interviewFocus":["Emphasis on API design and microservices architecture.","Assessment of knowledge in containerization and orchestration.","Evaluation of understanding in fault tolerance and resilience.","Focus on continuous learning and adaptability."],"commonQuestions":["Design an API gateway for a set of microservices.","How do you ensure data consistency in a distributed system?","Discuss your experience with containerization technologies like Docker and Kubernetes.","What are the best practices for designing fault-tolerant systems?","How do you stay updated with the latest technology trends?"]}}

## Round 1: Technical Coding Round 1
**Type:** Data Structures and Algorithms Interview · **Difficulty:** Hard · **Duration:** 60 min
Coding challenge focusing on data structures and algorithms.
This round focuses on assessing your core programming skills and problem-solving abilities. You will be asked to solve one or two coding problems, typically involving data structures and algorithms. The interviewer will evaluate your approach, efficiency, code quality, and ability to explain your solution. Expect to write code in a shared editor or on a whiteboard.
**Interviewers look for:** Strong grasp of fundamental CS concepts.; Ability to translate requirements into working code.; Systematic approach to problem-solving.; Clear communication of logic and trade-offs.
**Evaluation criteria:** Correctness of the solution.; Efficiency of the solution (time and space complexity).; Code quality and readability.; Problem-solving approach and ability to handle edge cases.; Communication of thought process.
**Common rejection reasons:** Inability to articulate thought process clearly.; Lack of fundamental data structures and algorithms knowledge.; Poor coding practices (e.g., no error handling, inefficient solutions).; Inability to optimize solutions for time or space complexity.
## Questions

- Given a binary tree, find its inorder traversal.
- Implement a function to find the median of a stream of numbers.
- Given an array of integers, find the contiguous subarray with the largest sum.

## Preparation tips

- Practice coding problems extensively.
- Focus on understanding the underlying data structures and algorithms.
- Be prepared to discuss time and space complexity.
- Practice explaining your thought process out loud.
- Consider edge cases and error handling.

## Round 2: System Design Round
**Type:** System Design Interview · **Difficulty:** Hard · **Duration:** 60 min
Design a scalable system based on a given problem statement.
This round assesses your ability to design large-scale, distributed systems. You'll be presented with an open-ended problem (e.g., design Twitter's feed, design a URL shortener) and expected to propose a solution. The interviewer will probe your design choices, ask about trade-offs, and explore how your system would scale and handle failures.
**Interviewers look for:** Experience in designing complex systems.; Knowledge of distributed systems principles.; Ability to think at a high level and break down problems.; Pragmatic approach to design choices.
**Evaluation criteria:** Clarity and feasibility of the proposed design.; Understanding of scalability, reliability, and performance.; Ability to identify and discuss trade-offs.; Consideration of various system components (databases, caching, APIs, etc.).; Handling of edge cases and failure scenarios.
**Common rejection reasons:** Inability to design scalable and robust systems.; Lack of understanding of distributed systems concepts.; Poor trade-off analysis.; Failure to consider non-functional requirements (scalability, reliability, maintainability).
## Questions

- Design a system like Google Maps.
- Design an API for a ride-sharing service.
- How would you design a distributed cache?

## Preparation tips

- Study common system design patterns and architectures.
- Practice designing various types of systems.
- Be prepared to discuss databases, caching strategies, load balancing, and APIs.
- Think about scalability, availability, and consistency.
- Clearly communicate your design and justify your decisions.

## Round 3: Behavioral and Cultural Fit Round
**Type:** Behavioral Interview · **Difficulty:** Medium · **Duration:** 45 min
Assesses behavioral competencies and cultural fit.
This round focuses on your behavioral and cultural fit. You'll be asked questions about your past experiences, how you handle different situations (e.g., conflict, failure, success), and your motivations. The goal is to understand how you work within a team and align with Cisco's culture.
**Interviewers look for:** Cultural fit.; Teamwork and collaboration abilities.; Self-awareness and ability to reflect on past experiences.; Passion for technology and the company.
**Evaluation criteria:** Alignment with Cisco's values (e.g., integrity, innovation, collaboration).; Teamwork and collaboration skills.; Problem-solving approach in non-technical contexts.; Communication and interpersonal skills.; Motivation and career aspirations.
**Common rejection reasons:** Lack of alignment with team values or company culture.; Poor communication or interpersonal skills.; Inability to provide specific examples for behavioral questions.; Lack of enthusiasm or interest in the role/company.
## Questions

- Tell me about a time you had to work with a difficult colleague. How did you handle it?
- Describe a project you are particularly proud of and your role in it.
- How do you handle constructive criticism?

## Preparation tips

- Prepare examples using the STAR method.
- Research Cisco's values and culture.
- Be honest and authentic in your responses.
- Show enthusiasm for the role and the company.
- Ask thoughtful questions about the team and work environment.

## Round 4: Hiring Manager Round
**Type:** Managerial Round · **Difficulty:** Medium · **Duration:** 45 min
Discuss career goals, leadership, and strategic vision with the hiring manager.
This final round is typically with the hiring manager or a senior leader. It's a chance to discuss your career aspirations, leadership potential, and how you see yourself contributing to Cisco at a senior level. They will assess your overall fit, strategic thinking, and alignment with the team's objectives.
**Interviewers look for:** Leadership qualities.; Strategic thinking.; Mentorship capabilities.; Alignment with team and company goals.; Enthusiasm and drive.
**Evaluation criteria:** Leadership potential and ability to influence.; Strategic thinking and long-term vision.; Alignment of career goals with the role and company.; Communication and interpersonal skills.; Overall fit for a senior role.
**Common rejection reasons:** Lack of strategic thinking or leadership potential.; Inability to articulate a clear vision or direction.; Poor alignment on career goals or expectations.; Lack of confidence or conviction in technical decisions.
## Questions

- What are your long-term career goals?
- How would you mentor junior engineers on the team?
- What are your thoughts on the future of [relevant technology area]?

## Preparation tips

- Think about your career goals and how this role fits into them.
- Prepare examples of your leadership and mentorship experiences.
- Be ready to discuss your vision for the team or technology area.
- Ask insightful questions about the team's challenges and opportunities.
- Showcase your passion and commitment.