Scale Engineer

Senior Staff SDE II

Software EngineerL7-IIVery High

This interview process is designed to assess candidates for the Senior Staff Software Engineer II (L7-II) position at Coupang. It evaluates technical depth, system design capabilities, leadership potential, and cultural fit.

Rounds·4

Timeline·~14d

Experience·8 - 15 yrs

Comp band·US$180000 - US$250000

Interview time·240 min

Evaluation

What they measure.

  • Technical proficiency in core programming languages and data structures.
  • Ability to design scalable, reliable, and maintainable systems.
  • Problem-solving skills and analytical thinking.
  • Understanding of software development best practices and methodologies.
  • Knowledge of algorithms and data structures.

Preparation

How to prepare.

Tips

  1. Thoroughly review fundamental computer science concepts, including data structures, algorithms, and complexity analysis.
  2. Practice system design problems, focusing on scalability, reliability, and trade-offs.
  3. Prepare to discuss your past projects in detail, highlighting your contributions and technical decisions.
  4. Brush up on behavioral questions using the STAR method (Situation, Task, Action, Result).
  5. Research Coupang's business, products, and technology stack to understand their challenges and opportunities.
  6. Familiarize yourself with common distributed systems patterns and technologies.
  7. Practice coding problems on platforms like LeetCode, HackerRank, or similar, focusing on medium to hard difficulty.
  8. Understand the nuances of large-scale e-commerce systems, including inventory management, order processing, and recommendation engines.
  9. Prepare questions to ask the interviewers about the role, team, and company culture.

Study plan

Fig · Study plan — 04 phases

01 / 04
01

Phase 01 of 04

Data Structures & Algorithms

Weeks 1-2: DSA fundamentals. Practice 2-3 LeetCode medium problems daily.

Weeks 1-2: Focus on core Data Structures and Algorithms. Cover arrays, linked lists, trees, graphs, hash tables, heaps, sorting, searching, dynamic programming, and greedy algorithms. Practice implementing these and analyzing their time/space complexity. Aim for 2-3 LeetCode medium problems daily.

Questions

Commonly asked.

  • Design a system to handle real-time inventory updates for a large e-commerce platform.
  • How would you optimize the performance of a search results page that experiences high traffic?
  • Describe a situation where you had to make a significant technical decision with incomplete information. What was your process?
  • What are the key metrics you would track to ensure the health and performance of a distributed system?
  • How do you approach code reviews to ensure quality and knowledge sharing within a team?
  • Tell me about a time you failed. What did you learn from it?
  • Design a recommendation engine for a personalized shopping experience.
  • How do you handle backward compatibility when evolving APIs in a microservices architecture?
  • Describe your experience with A/B testing and its role in product development.
  • What are your thoughts on the future of e-commerce technology?

Locations

Regional differences.

Fig · Regions — 02 locations

01 / 02

Location

Seoul, South Korea

Interview focus

Deep dive into distributed systems and high-availability architectures.Leadership and mentorship capabilities.Problem-solving complex, ambiguous technical issues.Understanding of large-scale data processing and analytics.Strategic thinking regarding technology choices and roadmaps.

Common questions

  • How would you design a distributed caching system for a large e-commerce platform like Coupang?
  • Describe a time you had to mentor junior engineers. What was your approach and what was the outcome?
  • Discuss a complex technical challenge you faced and how you overcame it, focusing on your decision-making process.
  • How do you ensure the scalability and reliability of microservices in a high-traffic environment?
  • What are your strategies for managing technical debt in a large, evolving codebase?

Tips

  • Emphasize experience with large-scale, global systems.
  • Highlight contributions to open-source projects or significant technical publications.
  • Be prepared to discuss your influence on engineering best practices and team culture.
  • Showcase experience in cross-functional collaboration and influencing product strategy.
  • Demonstrate a strong understanding of the Korean market and e-commerce landscape if interviewing for a role based in Korea.

Rounds

Round-by-round.

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

DSA

Coding questions at Coupang.

Frequently reported on Coupang loops

View all at Coupang

Other guides

More at Coupang.