# Software Engineer II **Role:** Software Engineer · **Level:** IC2 **Company:** [Compass](https://scaleengineer.com/companies/compass) **Difficulty:** Medium **Salary:** US$90000 - US$130000 **Experience:** 2 - 5 **Timeline:** ~7 days The Software Engineer II (IC2) interview at Compass is designed to assess a candidate's technical proficiency, problem-solving abilities, and cultural fit within the company. The process typically involves multiple rounds, starting with an HR screening, followed by technical interviews focusing on data structures, algorithms, and system design, and concluding with a behavioral or managerial interview. Canonical: https://scaleengineer.com/interviews/compass/ic2-software-engineer --- ## Overall evaluation - Technical Skills - Communication - Behavioral and Cultural Fit ## Questions asked - Given an array of integers, find the contiguous subarray with the largest sum. - Design a system to count the number of unique visitors to a website. - Explain the concept of recursion with an example. - How would you optimize a slow database query? - Describe a time you disagreed with a team member and how you resolved it. - What are the trade-offs between using a relational database and a NoSQL database? - Implement a function to reverse a linked list. - How do you approach debugging a complex issue? - Tell me about a project where you had to make significant technical decisions. - What are your career aspirations? ## Preparation tips ### lists - Review fundamental data structures (arrays, linked lists, trees, graphs, hash maps) and algorithms (sorting, searching, dynamic programming, graph traversal). - Practice coding problems on platforms like LeetCode, HackerRank, or AlgoExpert. - Study system design concepts, including scalability, availability, reliability, and common design patterns. - Prepare to discuss your past projects in detail, focusing on your contributions, challenges, and learnings. - Understand Compass's mission, values, and recent projects. - Prepare 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 and algorithms. Cover arrays, linked lists, stacks, queues, trees (binary trees, BSTs, heaps), graphs, and hash tables. Practice common algorithms like sorting (quicksort, mergesort), searching (binary search), and basic graph traversals (BFS, DFS). Aim to solve at least 2-3 problems per day.","shortDescription":"Weeks 1-2: Data Structures & Algorithms Fundamentals. Practice 2-3 problems daily."} - {"title":"System Design","longDescription":"Weeks 3-4: Dive into system design. Understand concepts like load balancing, caching, databases (SQL vs. NoSQL), message queues, and API design. Study common system design interview questions and practice designing scalable systems. Read articles and watch videos on system architecture.","shortDescription":"Weeks 3-4: System Design Concepts. Study scalability, caching, databases, APIs."} - {"title":"Behavioral and Situational Preparation","longDescription":"Week 5: Prepare for behavioral and situational questions. Reflect on your past experiences and prepare examples using the STAR method. Think about your strengths, weaknesses, career goals, and why you are interested in Compass. Practice articulating your thought process and experiences clearly.","shortDescription":"Week 5: Behavioral & Situational Questions. Prepare STAR method examples."} - {"title":"Mock Interviews and Final Review","longDescription":"Week 6: Mock interviews and review. Conduct mock interviews with peers or mentors to simulate the actual interview environment. Review any areas you feel weak in and refine your answers. Ensure you are comfortable discussing your resume and projects.","shortDescription":"Week 6: Mock Interviews & Review. Simulate interview conditions."} ## Location differences - {"location":"North America","differences":{"tips":["Be prepared to whiteboard solutions for algorithmic problems.","Practice explaining your thought process.","Research common system design patterns."],"interviewFocus":["Strong emphasis on core computer science fundamentals.","Problem-solving and analytical skills.","Ability to articulate technical concepts clearly."],"commonQuestions":["How would you design a URL shortening service?","Explain the difference between a process and a thread.","Describe a challenging project you worked on and how you overcame obstacles."]}} - {"location":"Europe","differences":{"tips":["Highlight projects involving scalability and performance.","Be ready to discuss trade-offs in system design.","Prepare examples of teamwork and conflict resolution."],"interviewFocus":["Experience with large-scale systems and distributed computing.","Understanding of cloud technologies (AWS, Azure, GCP).","Collaboration and communication skills."],"commonQuestions":["Discuss your experience with distributed systems.","How do you handle concurrency issues?","Tell me about a time you had to work with a difficult stakeholder."]}} - {"location":"Asia","differences":{"tips":["Showcase your understanding of best practices in software development.","Be prepared to discuss your contributions to team processes.","Emphasize your ability to learn new technologies quickly."],"interviewFocus":["Familiarity with software development lifecycle (SDLC).","Knowledge of testing strategies and tools.","Adaptability and learning agility."],"commonQuestions":["What are your thoughts on agile methodologies?","Describe your experience with CI/CD pipelines.","How do you ensure code quality?"]}} ## Round 1: Data Structures and Algorithms Round **Type:** Technical Interview (Data Structures & Algorithms) · **Difficulty:** Medium · **Duration:** 45 min Assess fundamental CS knowledge with coding problems. This round focuses on assessing your fundamental computer science knowledge, particularly in data structures and algorithms. You will be presented with coding problems that require you to implement solutions using appropriate data structures and algorithms. The interviewer will evaluate your approach to problem-solving, your ability to write clean and efficient code, and your understanding of time and space complexity. **Interviewers look for:** Logical thinking; Ability to break down problems; Clean and efficient code; Understanding of time and space complexity **Evaluation criteria:** Problem-solving skills; Algorithmic knowledge; Coding proficiency; Communication **Common rejection reasons:** Inability to articulate thought process.; Poor understanding of fundamental data structures.; Inefficient or incorrect algorithmic solutions.; Lack of clarity in communication. ## Questions - Given a binary tree, find its maximum depth. - Implement a function to check if a string is a palindrome. - Find the kth smallest element in a sorted matrix. ## Preparation tips - Practice coding on a whiteboard or a shared editor. - Be prepared to explain your code line by line. - Think out loud and communicate your thought process. - Consider edge cases and test your solution thoroughly. ## Round 2: System Design Round **Type:** System Design Interview · **Difficulty:** Medium-Hard · **Duration:** 60 min Assess ability to design scalable and reliable software systems. This round evaluates your ability to design and architect software systems. You will be given a high-level problem (e.g., design a social media feed, a URL shortener) and expected to propose a scalable, reliable, and maintainable solution. The interviewer will probe your design choices, discuss trade-offs, and assess your understanding of distributed systems concepts. **Interviewers look for:** Ability to design complex systems; Understanding of distributed systems; Knowledge of databases and caching; Consideration of performance and availability **Evaluation criteria:** System design principles; Scalability; Reliability; Trade-off analysis; Problem decomposition **Common rejection reasons:** Inability to design scalable and reliable systems.; Lack of understanding of trade-offs.; Poor consideration of failure scenarios.; Difficulty in explaining design choices. ## Questions - Design a rate limiter. - Design a distributed cache. - Design Twitter's news feed. ## Preparation tips - Study common system design patterns and architectures. - Practice designing systems for scale and high availability. - Be prepared to discuss databases, caching strategies, load balancing, and APIs. - Clearly articulate your design decisions and justify them. ## Round 3: Behavioral and Managerial Round **Type:** Behavioral / Managerial Interview · **Difficulty:** Medium · **Duration:** 45 min Assess behavioral competencies, teamwork, and cultural fit. This round focuses on your behavioral and situational responses, as well as your overall fit with the team and Compass culture. You'll be asked questions about past experiences, how you handle challenges, teamwork, and your career aspirations. The interviewer aims to understand your working style, your ability to collaborate, and your potential to grow within the company. **Interviewers look for:** Team player attitude; Self-awareness; Ability to handle conflict; Alignment with company values; Growth mindset **Evaluation criteria:** Behavioral competencies; Teamwork and collaboration; Problem-solving approach in team settings; Cultural alignment; Motivation and career goals **Common rejection reasons:** Poor cultural fit.; Lack of collaboration skills.; Inability to handle feedback.; Unrealistic career expectations.; Lack of enthusiasm for the role or company. ## Questions - Tell me about a time you failed and what you learned from it. - How do you handle constructive criticism? - Describe a situation where you had to work with a difficult colleague. ## Preparation tips - Prepare examples using the STAR method. - Be honest and authentic in your responses. - Show enthusiasm for the role and the company. - Ask thoughtful questions about the team and the work environment.