Scale Engineer

Software Engineer

Software EngineerL3Medium

This interview process is for a Software Engineer position at LINE, specifically for the L3 level. It is designed to assess a candidate's technical skills, problem-solving abilities, and cultural fit within the company.

Rounds·4

Timeline·~14d

Experience·1 - 3 yrs

Comp band·US$55000 - US$75000

Interview time·210 min

Evaluation

What they measure.

  • Problem-solving skills
  • Algorithmic thinking
  • Data structure knowledge
  • Coding proficiency
  • System design capabilities
  • Communication skills
  • Teamwork and collaboration
  • Cultural fit

Preparation

How to prepare.

Tips

  1. Review fundamental data structures and algorithms (arrays, linked lists, trees, graphs, sorting, searching).
  2. Practice coding problems on platforms like LeetCode, HackerRank, or Codewars.
  3. Study common system design concepts (scalability, availability, databases, caching, load balancing).
  4. Prepare to discuss your past projects and technical challenges you've faced.
  5. Understand LINE's products and services.
  6. Research common behavioral interview questions and prepare STAR method responses.
  7. Practice explaining your solutions and thought process clearly.

Study plan

Fig · Study plan — 05 phases

01 / 05
01

Phase 01 of 05

Data Structures and Algorithms Fundamentals

Weeks 1-2: Data Structures & Basic Algorithms. Practice 2-3 problems/day.

Weeks 1-2: Focus on core data structures (arrays, linked lists, stacks, queues, hash maps) and basic algorithms (sorting, searching). Practice implementing these from scratch and solving problems involving them. Aim for 2-3 problems per day.

Questions

Commonly asked.

  • Given an array of integers, find the contiguous subarray with the largest sum.
  • Design a system to count the number of active users on a website in real-time.
  • Tell me about a time you disagreed with a teammate. How did you handle it?
  • Implement a function to reverse a linked list.
  • How would you scale a web application to handle millions of users?
  • Describe a project you are particularly proud of and your role in it.
  • What are the trade-offs between SQL and NoSQL databases?
  • How do you approach learning a new technology?
  • Explain the concept of recursion with an example.
  • What are your strengths and weaknesses as a software engineer?

Locations

Regional differences.

Fig · Regions — 02 locations

01 / 02

Location

Seoul

Interview focus

Emphasis on practical application of data structures and algorithms in real-world scenarios.Assessment of understanding of distributed systems and scalability.Evaluation of communication and collaboration skills.

Common questions

  • How would you optimize a database query for a high-traffic e-commerce site?
  • Describe a challenging bug you encountered and how you debugged it.
  • Tell me about a time you had to work with a difficult team member.

Tips

  • Be prepared to discuss specific projects and your contributions in detail.
  • Familiarize yourself with common system design patterns.
  • Practice explaining technical concepts clearly and concisely.

Rounds

Round-by-round.

Expand a step for evaluation criteria, sample questions, and prep notes.

DSA

Coding questions at LINE.

Frequently reported on LINE loops

View all at LINE

Other guides

More at LINE.