# Software Engineer **Role:** Software Engineer · **Level:** L3 **Company:** [DRW](https://scaleengineer.com/companies/drw) **Difficulty:** Medium **Salary:** US$90000 - US$130000 **Experience:** 2 - 5 **Timeline:** ~14 days This interview process is for a Software Engineer (L3) position at DRW. It is designed to assess a candidate's technical skills, problem-solving abilities, and cultural fit within the company. Canonical: https://scaleengineer.com/interviews/drw/l3-software-engineer --- ## Overall evaluation - Technical Skills - Communication - Behavioral and Cultural Fit ## Questions asked - Write a function to reverse a linked list. - Given an array of integers, find the two numbers that add up to a specific target. - Explain the difference between a process and a thread. - How would you design a system to handle real-time stock price updates? - Tell me about a time you had to debug a complex issue. - What are your strengths and weaknesses? - Why are you interested in DRW? ## Preparation tips ### lists - Review fundamental data structures and algorithms. - Practice coding problems on platforms like LeetCode or HackerRank. - Brush up on object-oriented programming principles. - Understand common software design patterns. - Prepare to discuss your past projects and experiences in detail. - Research DRW's business and values. - Practice explaining your thought process clearly. - Prepare questions to ask the interviewer. ### studyPlan - {"title":"Data Structures and Algorithms Fundamentals","longDescription":"Weeks 1-2: Focus on core data structures (arrays, linked lists, stacks, queues, trees, graphs, hash maps) and their common operations and time complexities. Practice basic algorithms like sorting (quicksort, mergesort) and searching (binary search).","shortDescription":"Weeks 1-2: Data Structures & Basic Algorithms"} - {"title":"Algorithmic Techniques","longDescription":"Weeks 3-4: Dive deeper into algorithmic techniques such as dynamic programming, greedy algorithms, and graph traversal (BFS, DFS). Practice problems that require these techniques.","shortDescription":"Weeks 3-4: Advanced Algorithms"} - {"title":"System Design Fundamentals","longDescription":"Week 5: Focus on system design principles. Understand concepts like scalability, availability, load balancing, caching, and database design. Practice designing common systems like a URL shortener or a Twitter feed.","shortDescription":"Week 5: System Design Basics"} - {"title":"Behavioral and Situational Questions","longDescription":"Week 6: Prepare for behavioral questions. Reflect on your past experiences using the STAR method (Situation, Task, Action, Result). Think about examples that demonstrate teamwork, problem-solving, leadership, and handling challenges.","shortDescription":"Week 6: Behavioral Preparation"} - {"title":"Final Preparation","longDescription":"Week 7: Review your resume and be ready to discuss any project or experience listed. Prepare insightful questions to ask the interviewer about the role, team, and company culture.","shortDescription":"Week 7: Resume Review & Questions"} ## Location differences - {"location":"Chicago","differences":{"tips":["Research local tech communities and meetups.","Be prepared to discuss how your skills align with the specific needs of this office."],"interviewFocus":["Adaptability to local market trends","Understanding of regional technology adoption"],"commonQuestions":["Tell me about a challenging project you worked on.","How do you handle tight deadlines?","Describe a time you disagreed with a teammate and how you resolved it."]}} - {"location":"Remote","differences":{"tips":["Highlight your experience with virtual teams and tools.","Demonstrate strong communication skills, both written and verbal."],"interviewFocus":["Proficiency in remote collaboration and communication","Self-discipline and time management in a remote setting"],"commonQuestions":["What are your thoughts on remote collaboration tools?","How do you stay motivated when working remotely?","Describe a situation where you had to explain a complex technical concept to a non-technical audience."]}} ## Round 1: Data Structures and Algorithms **Type:** Technical Interview (Coding) · **Difficulty:** Medium · **Duration:** 45 min Coding challenge focusing on data structures and algorithms. This round focuses on your fundamental programming skills. You will be asked to solve one or two coding problems, typically involving data structures and algorithms. The interviewer will assess your ability to write clean, efficient, and correct code, as well as your approach to problem-solving and your communication during the process. **Interviewers look for:** Ability to translate a problem into code.; Understanding of time and space complexity.; Clean and maintainable code. **Evaluation criteria:** Correctness of code; Efficiency of solution (time and space complexity); Clarity and readability of code; Problem-solving approach **Common rejection reasons:** Inability to solve basic coding problems.; Poor understanding of fundamental data structures.; Lack of clear communication during problem-solving. ## Questions - Given a string, find the length of the longest substring without repeating characters. - Implement a function to check if a binary tree is a valid Binary Search Tree. ## Preparation tips - Practice coding problems on platforms like LeetCode (Easy/Medium). - Understand the time and space complexity of your solutions. - Be prepared to explain your thought process step-by-step. - Write code that is well-formatted and readable. ## Round 2: System Design **Type:** System Design Interview · **Difficulty:** Medium-Hard · **Duration:** 60 min Design a scalable software system. This round assesses your ability to design and build scalable and reliable software systems. You will be presented with a high-level problem (e.g., design a URL shortener, design a social media feed) and expected to discuss various aspects of the system, including data storage, APIs, caching strategies, and potential bottlenecks. The focus is on your thought process and ability to make informed design decisions. **Interviewers look for:** Ability to think about large-scale systems.; Understanding of common system design patterns.; Ability to identify and mitigate potential bottlenecks.; Pragmatic approach to problem-solving. **Evaluation criteria:** Scalability of the design; Availability and reliability considerations; Trade-off analysis; Understanding of core system components (databases, caching, load balancers); Clarity of explanation **Common rejection reasons:** Inability to design scalable systems.; Lack of understanding of distributed systems concepts.; Poor trade-off analysis in design choices. ## Questions - Design a system like TinyURL. - How would you design a rate limiter? ## Preparation tips - Study common system design patterns and concepts. - Practice designing systems like Twitter, Facebook, or Uber. - Understand trade-offs between different technologies and approaches. - Be prepared to draw diagrams and explain your design choices. ## Round 3: Behavioral and Managerial **Type:** Behavioral Interview · **Difficulty:** Medium · **Duration:** 30 min Assess personality, work style, and cultural fit. This round is focused on understanding your personality, work style, and how you would fit into the team and company culture. You'll be asked behavioral questions about your past experiences, how you handle challenges, and your motivations. The interviewer will also assess your communication skills and enthusiasm for the role. **Interviewers look for:** How you collaborate and communicate.; Your motivation for joining DRW.; Your ability to work in a team.; Your alignment with DRW's values. **Evaluation criteria:** Communication skills; Teamwork and collaboration; Problem-solving approach; Motivation and interest; Cultural alignment **Common rejection reasons:** Poor communication skills.; Lack of enthusiasm or interest in the role/company.; Inability to provide specific examples for behavioral questions.; Poor cultural fit. ## Questions - Tell me about a time you faced a significant technical challenge and how you overcame it. - How do you handle constructive criticism? - Why DRW? ## Preparation tips - Prepare answers to common behavioral questions using the STAR method. - Research DRW's mission, values, and culture. - Be ready to discuss your career goals and why you are interested in this specific role. - Show genuine enthusiasm and ask thoughtful questions.