# Software Engineer **Role:** Software Engineer · **Level:** L1 **Company:** [LINE](https://scaleengineer.com/companies/line) **Difficulty:** Medium **Salary:** US$50000 - US$70000 **Experience:** 0 - 2 **Timeline:** ~7 days This interview process is designed to assess candidates for a Software Engineer position at LINE, specifically at the L1 level. It evaluates fundamental technical skills, problem-solving abilities, and cultural fit within the company. Canonical: https://scaleengineer.com/interviews/line/l1-software-engineer --- ## Overall evaluation - Technical Skills - Behavioral and Cultural Fit - Foundational Knowledge ## Questions asked - Write a function to reverse a linked list. - Explain the difference between a process and a thread. - How would you design a URL shortener? - Tell me about a time you had to debug a complex issue. - What are your strengths and weaknesses as a software engineer? ## Preparation tips ### lists - Review fundamental data structures and algorithms. - Practice coding problems on platforms like LeetCode or HackerRank. - Understand the basics of object-oriented programming. - Prepare to discuss your past projects and technical challenges. - Research LINE's products and services. - Be ready to answer behavioral questions about teamwork and problem-solving. ### studyPlan - {"title":"Data Structures and Algorithms","longDescription":"Weeks 1-2: Focus on core data structures (arrays, linked lists, stacks, queues, trees, graphs, hash tables) and their common operations. Practice implementing them and solving problems related to their usage. Understand time and space complexity analysis (Big O notation).","shortDescription":"Weeks 1-2: Data Structures & Complexity Analysis."} - {"title":"Algorithms","longDescription":"Weeks 3-4: Dive into common algorithms such as sorting (bubble, merge, quick), searching (binary search), graph traversal (BFS, DFS), and dynamic programming. Solve problems that require applying these algorithms.","shortDescription":"Weeks 3-4: Algorithms (Sorting, Searching, Graphs, DP)."} - {"title":"Programming Concepts and Databases","longDescription":"Week 5: Brush up on object-oriented programming principles (encapsulation, inheritance, polymorphism) and common design patterns. Understand basic database concepts (SQL, NoSQL) and how to interact with them.","shortDescription":"Week 5: OOP, Design Patterns, Databases."} - {"title":"Behavioral and Company Fit","longDescription":"Week 6: Prepare for behavioral questions by reflecting on past experiences related to teamwork, problem-solving, handling challenges, and learning. Use the STAR method (Situation, Task, Action, Result) to structure your answers. Research LINE's company culture and values.","shortDescription":"Week 6: Behavioral Questions & Company Research."} - {"title":"Final Preparation","longDescription":"Week 7: Mock interviews focusing on both technical and behavioral aspects. Review any weak areas identified during practice. Ensure you have questions prepared for the interviewer.","shortDescription":"Week 7: Mock Interviews & Final Review."} ## Location differences - {"location":"Seoul","differences":{"tips":["Research LINE's presence and projects in this specific region.","Be prepared to discuss your experience with technologies relevant to the local market.","Practice articulating your thoughts clearly in the primary language of the office."],"interviewFocus":["Adaptability to local work culture","Communication skills in the local language","Understanding of local market trends"],"commonQuestions":["Tell me about a challenging project you worked on.","How do you handle tight deadlines?","Describe a time you disagreed with a teammate."]}} - {"location":"Tokyo","differences":{"tips":["Familiarize yourself with LINE's global engineering blog and recent tech announcements.","Be ready to explain your thought process when solving coding problems.","Highlight any experience with large-scale systems or distributed computing."],"interviewFocus":["Technical proficiency in core programming languages","Problem-solving approach","Collaboration and teamwork"],"commonQuestions":["What are your thoughts on open-source contributions?","How do you stay updated with new technologies?","Describe your experience with agile methodologies."]}} ## Round 1: Coding Challenge **Type:** Technical Interview (Coding) · **Difficulty:** Easy · **Duration:** 45 min Assess fundamental coding skills and problem-solving. This round focuses on assessing your fundamental programming skills and your ability to solve common algorithmic problems. You will be asked to write code to solve specific challenges, and your approach to problem-solving, code quality, and efficiency will be evaluated. **Interviewers look for:** Basic coding ability; Understanding of fundamental algorithms and data structures; Logical thinking **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 an array of integers, find the two numbers that add up to a specific target. - Implement a function to check if a binary tree is a Binary Search Tree (BST). ## Preparation tips - Practice coding on a whiteboard or a shared editor. - Think out loud and explain your thought process. - Consider edge cases and test your solution thoroughly. ## Round 2: System Design **Type:** System Design Interview · **Difficulty:** Medium · **Duration:** 60 min Assess system design and architectural thinking. This round evaluates your understanding of software design principles and your ability to think about system architecture. You'll be asked to design a system or a component, focusing on aspects like scalability, reliability, and maintainability. This is more of a discussion-based round. **Interviewers look for:** Ability to design scalable systems; Understanding of trade-offs in design choices; Communication skills **Evaluation criteria:** Understanding of system components; Scalability considerations; Trade-off analysis; Clarity of explanation **Common rejection reasons:** Inability to articulate technical concepts clearly.; Lack of understanding of system design principles.; Poor communication during discussions. ## Questions - Design a system to shorten URLs like bit.ly. - How would you design a real-time chat application? ## Preparation tips - Study common system design patterns. - Understand concepts like load balancing, caching, databases, and APIs. - Practice designing familiar systems (e.g., Twitter feed, URL shortener). ## Round 3: Behavioral and Fit **Type:** Behavioral Interview · **Difficulty:** Medium · **Duration:** 30 min Assess behavioral traits and cultural fit. This round focuses on your behavioral aspects and cultural fit within LINE. The interviewer will ask questions about your past experiences, how you handle different situations, your strengths and weaknesses, and your career aspirations. The goal is to understand how you collaborate, learn, and contribute to a team. **Interviewers look for:** How you work with others; Your motivation and career goals; Your ability to handle challenges and learn from mistakes **Evaluation criteria:** Teamwork and collaboration skills; Problem-solving approach in team settings; Adaptability and learning attitude; Cultural fit with LINE **Common rejection reasons:** Poor communication and interpersonal skills.; Lack of alignment with company values.; Inability to provide specific examples for behavioral questions. ## Questions - Tell me about a time you faced a conflict with a colleague and how you resolved it. - Describe a project where you had to learn a new technology quickly. How did you approach it? ## Preparation tips - Prepare examples using the STAR method. - Research LINE's mission, vision, and values. - Be honest and authentic in your responses.