# Software Engineer
**Role:** Software Engineer · **Level:** Software Engineer
**Company:** [Zendesk](https://scaleengineer.com/companies/zendesk)
**Difficulty:** Medium to Hard
**Salary:** US$90000 - US$150000
**Experience:** 0 - 10
**Timeline:** ~14 days
The Zendesk Software Engineer interview process is designed to assess a candidate's technical skills, problem-solving abilities, cultural fit, and potential for growth within the company. It typically involves multiple rounds, starting with an initial screening and progressing through technical assessments and interviews with hiring managers and team members.
Canonical: https://scaleengineer.com/interviews/zendesk/software-engineer-software-engineer
---
## Overall evaluation

- Technical Proficiency
- Cultural Fit and Behavioral
- Communication and Collaboration

## Questions asked

- Tell me about a time you faced a challenging technical problem and how you solved it.
- How would you design a system to handle real-time chat for millions of users?
- What are your strengths and weaknesses as a software engineer?
- Describe a situation where you had to work with a difficult team member.
- How do you stay updated with the latest technologies and trends in software development?
- Explain the concept of RESTful APIs and their principles.
- What is the difference between a process and a thread?
- How would you optimize the performance of a slow database query?
- Describe a project you are particularly proud of and your role in it.
- What are your career aspirations for the next 3-5 years?

## Preparation tips

### lists

- Review fundamental data structures and algorithms.
- Practice coding problems on platforms like LeetCode, HackerRank, or Coderbyte.
- Understand common system design principles and trade-offs.
- Prepare to discuss your past projects and experiences in detail, focusing on your contributions and learnings.
- Research Zendesk's products, values, and engineering culture.
- Prepare questions to ask the interviewers about the role, team, and company.
- Practice behavioral questions using the STAR method (Situation, Task, Action, Result).

### 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, recursion). Practice implementing these from scratch and analyze their time and space complexity. Solve at least 20-30 problems related to these topics.","shortDescription":"Weeks 1-2: Data Structures & Algorithms fundamentals. Practice 20-30 problems."}
- {"title":"System Design","longDescription":"Weeks 3-4: Dive into system design concepts. Study topics like scalability, reliability, availability, databases (SQL vs. NoSQL), caching, load balancing, and API design. Review common system design interview questions and practice designing systems like Twitter feed, URL shortener, etc.","shortDescription":"Weeks 3-4: System Design principles. Practice designing common systems."}
- {"title":"Behavioral and Situational Questions","longDescription":"Week 5: Prepare for behavioral and situational questions. Reflect on your past experiences and identify examples that showcase your problem-solving, teamwork, leadership, and conflict-resolution skills. Use the STAR method to structure your answers.","shortDescription":"Week 5: Behavioral questions preparation using STAR method."}
- {"title":"Company Research and Final Preparation","longDescription":"Week 6: Research Zendesk thoroughly. Understand their mission, values, products, and recent news. Prepare insightful questions to ask the interviewers. Review your resume and be ready to discuss any project or experience listed.","shortDescription":"Week 6: Company research and question preparation."}

## Location differences

- {"location":"San Francisco","differences":{"tips":["Familiarize yourself with AWS services and common cloud design patterns.","Be prepared to discuss your experience with containerization and orchestration.","Highlight any contributions to open-source projects or community involvement.","Showcase your ability to work in an agile environment and collaborate effectively."],"interviewFocus":["Emphasis on distributed systems and cloud-native technologies (AWS, Kubernetes).","Strong focus on practical problem-solving and debugging skills in a cloud environment.","Assessment of experience with CI/CD pipelines and DevOps practices.","Understanding of data structures and algorithms relevant to large-scale systems."],"commonQuestions":["How would you handle a sudden surge in user traffic on our platform?","Describe a time you had to debug a complex production issue. What was your approach?","What are your thoughts on microservices architecture and its trade-offs?","How do you ensure the scalability and reliability of the software you build?","Tell me about a challenging project you worked on and how you overcame obstacles."]}}
- {"location":"London","differences":{"tips":["Brush up on common data structures and algorithms, and practice solving problems on platforms like LeetCode.","Be ready to explain your thought process clearly and concisely.","Prepare examples that demonstrate your ability to write clean, maintainable, and efficient code.","Understand the importance of collaboration and communication in a team setting."],"interviewFocus":["Focus on core computer science fundamentals and data structures.","Assessment of problem-solving skills with a focus on algorithmic efficiency.","Evaluation of software design principles and best practices.","Understanding of testing methodologies and quality assurance."],"commonQuestions":["How would you design a system to handle real-time notifications for millions of users?","Describe your experience with database optimization and performance tuning.","What are the key principles of object-oriented design, and how do you apply them?","How do you approach code reviews to ensure code quality and maintainability?","Tell me about a time you disagreed with a technical decision and how you handled it."]}}
- {"location":"Dublin","differences":{"tips":["Be prepared to discuss your experience with building and deploying web services.","Highlight your understanding of security principles and how to mitigate risks.","Showcase your ability to mentor and guide other engineers.","Demonstrate your passion for continuous learning and staying updated with new technologies."],"interviewFocus":["Emphasis on system design and architecture for web applications.","Assessment of experience with backend development and API design.","Understanding of security best practices and common vulnerabilities.","Evaluation of leadership potential and mentoring capabilities."],"commonQuestions":["How do you approach building scalable and resilient APIs?","Describe your experience with different programming paradigms (e.g., functional, imperative).","What are the trade-offs between different database technologies (SQL vs. NoSQL)?","How do you ensure the security of the applications you develop?","Tell me about a time you had to mentor a junior engineer."]}}

## Round 1: Recruiter Screen
**Type:** Recruiter Screen · **Difficulty:** Medium · **Duration:** 45 min
Initial screening to assess cultural fit and basic qualifications.
This initial round is conducted by a recruiter or HR representative to assess your overall fit with Zendesk's culture and values, understand your career aspirations, and confirm your basic qualifications and interest in the role. They will also provide an overview of the interview process and answer any initial questions you may have.
**Interviewers look for:** Ability to write clean and functional code.; Understanding of basic algorithms.; Clear communication of thought process.
**Evaluation criteria:** Basic coding proficiency; Understanding of fundamental data structures; Problem-solving approach
**Common rejection reasons:** Lack of fundamental programming knowledge.; Inability to articulate thought process.; Poor problem-solving approach.; Not enough coding practice.
## Questions

- Tell me about yourself.
- Why are you interested in Zendesk?
- What are your salary expectations?
- What are your strengths and weaknesses?

## Preparation tips

- Be prepared to talk about your resume and career goals.
- Research Zendesk's mission and values.
- Practice answering common behavioral questions.
- Have questions ready to ask the interviewer.

## Round 2: Coding Interview
**Type:** Technical Phone Screen / Coding Interview · **Difficulty:** Hard · **Duration:** 60 min
Assess coding skills and problem-solving abilities with data structures and algorithms.
This round focuses on your technical abilities. You will be asked to solve one or two coding problems, typically involving data structures and algorithms. The interviewer will assess your approach to problem-solving, your ability to write clean and efficient code, and your understanding of complexity analysis. You might be asked to code in a shared editor or on a whiteboard.
**Interviewers look for:** Ability to implement common data structures and algorithms.; Logical thinking and problem-solving approach.; Writing clean, efficient, and well-tested code.; Understanding of time and space complexity.
**Evaluation criteria:** Data structure and algorithm knowledge; Coding proficiency; Problem-solving skills; Efficiency of solutions
**Common rejection reasons:** Inability to solve coding problems efficiently.; Poor understanding of time and space complexity.; Difficulty translating requirements into code.; Lack of attention to edge cases.
## Questions

- Given an array of integers, find the contiguous subarray with the largest sum.
- Implement a function to reverse a linked list.
- Find the kth smallest element in a binary search tree.
- Given a string, find the length of the longest substring without repeating characters.

## Preparation tips

- Practice coding problems on platforms like LeetCode, HackerRank.
- Review common data structures (arrays, linked lists, trees, graphs, hash maps) and algorithms (sorting, searching, dynamic programming).
- Focus on understanding time and space complexity (Big O notation).
- Practice explaining your thought process out loud while solving problems.

## Round 3: System Design Interview
**Type:** System Design Interview · **Difficulty:** Hard · **Duration:** 60 min
Assess ability to design scalable and robust software systems.
This round evaluates your ability to design complex software systems. You'll be presented with a high-level problem (e.g., design a URL shortener, a Twitter feed, or a chat system) and expected to discuss various aspects like data modeling, API design, scalability, performance, and fault tolerance. The focus is on your thought process and ability to make reasoned design choices.
**Interviewers look for:** Ability to design scalable and robust systems.; Understanding of distributed systems concepts.; Knowledge of databases, caching, and load balancing.; Ability to articulate design decisions and justify trade-offs.
**Evaluation criteria:** System design principles; Scalability and performance; Reliability and availability; Trade-off analysis; Database knowledge
**Common rejection reasons:** Poor system design choices.; Inability to handle scale and performance considerations.; Lack of understanding of distributed systems.; Not considering trade-offs and failure scenarios.
## Questions

- Design a system like TinyURL.
- Design a news feed system similar to Facebook.
- How would you design a rate limiter?
- Design a system to store and retrieve user sessions.

## Preparation tips

- Study common system design patterns and concepts.
- Practice designing various systems, considering scalability, availability, and performance.
- Understand different database technologies (SQL, NoSQL) and their use cases.
- Learn about caching strategies, load balancing, and message queues.
- Be prepared to discuss trade-offs and justify your design decisions.

## Round 4: Hiring Manager Interview
**Type:** Behavioral / Hiring Manager Interview · **Difficulty:** Medium · **Duration:** 45 min
Assess behavioral competencies, teamwork, and cultural fit with the hiring manager.
This interview focuses on your behavioral and situational responses. The hiring manager will ask questions designed to understand how you've handled various work situations in the past, such as dealing with conflict, managing deadlines, collaborating with others, and overcoming challenges. They will also assess your motivation for the role and your potential fit within the team and company culture.
**Interviewers look for:** Evidence of collaboration and teamwork.; Ability to handle conflict and challenges constructively.; Ownership and accountability for work.; Alignment with Zendesk's core values.; Clear and concise communication.
**Evaluation criteria:** Behavioral competencies; Teamwork and collaboration; Communication skills; Problem-solving approach in past experiences; Cultural alignment
**Common rejection reasons:** Poor communication skills.; Lack of alignment with team values.; Negative attitude or lack of enthusiasm.; Inability to provide specific examples for behavioral questions.
## Questions

- Tell me about a time you had to deal with a difficult stakeholder.
- Describe a situation where you failed. What did you learn from it?
- How do you prioritize your work when you have multiple competing deadlines?
- Tell me about a time you went above and beyond what was expected.

## Preparation tips

- Prepare specific examples using the STAR method (Situation, Task, Action, Result) for common behavioral questions.
- Reflect on your past projects and identify instances that demonstrate teamwork, leadership, problem-solving, and resilience.
- Be ready to discuss your career goals and why you are interested in this specific role at Zendesk.
- Show enthusiasm and genuine interest in the company and the position.