Skip to main content

Principal, QA Engineer (Seller Portal)

Seoul, South Korea Job ID: 2041902


We are looking for people who are passionate about solving complex real-world problems, building world-class solutions, and benefitting millions of lives. At Coupang, developers learn from one another—we share knowledge and spur each other on to come up with great ideas—and move extremely fast to create profound impact together. You will also have the opportunity to tackle large-scale challenges that arise as we grow. This includes building in-house technology, innovating mobile architecture, and advancing possibilities with machine learning and deep learning. With you, we will build a world where our customers ask, “How did we ever live without Coupang?”

Success Profile

  • Team Player
  • Adaptable
  • Inventive
  • Self-starter
  • Problem Solver
  • Goal-oriented
  • Quick-thinking


Job ID 2041902 Date posted  02/26/2020 Location Seoul, South Korea

Coupang is one of the largest and fastest growing e-commerce platforms on the planet. We are on a mission to revolutionize everyday lives for our customers, employees and partners. We solve problems no one has solved before to create a world where people ask, “How did we ever live without Coupang?” Coupang is a global company with offices in Beijing, Los Angeles, Seattle, Seoul, Shanghai, and Silicon Valley. 


Job Overview:

At Coupang we value two different types of customers: the people who purchase the products on, and the people who sell their products in our marketplace, sellers. Our teams of technical and business experts are focused on the seller experience and success, as we believe the sellers are the key drivers for the success of everyone engaged with Coupang service. Coupang Marketplace is an engine of growth for our third-party sellers, and they are now contributing to nearly 40% of the Coupang’s GMV. We have started to onboard global sellers from US , China and Europe with strong initiatives for building a next generation Global Marketplace.

Seller Portal team at Coupang is to the design and development of Marketplace platform that allows our vendors and third-party sellers to publish their merchandise to our catalog, fulfill orders and get paid, without the friction inherent in the traditional retail model. You will be responsible for ensuring the quality of the optimal solution through our platform to provide the seller with end-to-end sales experiences from publishing goods, fulfilling, shipping orders to payment and highly scalable, distributed systems to accommodate tens of thousands of sellers with access to tens of millions of products world-wide. You will join a highly technical and entrepreneurial team building applications to disrupt the B2B e-commerce segment. You will participate in making the efficiency testing process to delivery service with high trust. You will evaluate and make decisions around the use of new or existing technologies and tools, and you’ll coach and work with development engineers.

Coupang is a global company, where you will work with the best in the industry, with many of our team members coming from Amazon, Microsoft, eBay, PayPal, Facebook, and more! You will work in a collaborative, dynamic, entrepreneurial and open environment to deliver value incrementally and frequently. Our agile environment will enable you rapidly innovate with the most cutting-edge technologies.


Key Responsibilities: 

  • Translate the desired business outcome to technical solutions that meet operational and business needs
  • Translate requirements and guidelines to test scenarios, cases, and strategies.
  • Automate test process and test automation tools and frameworks
  • Implement unit, regression, integration, performance, security, and acceptance tests
  • Bring solutions to the organization and improve the value proposition and efficiency of the overall platform
  • Participate in all level of product design and work with product owners, product development team, and end product user
  • Have knowledge of and ability to teach and mentor other engineers



  • BA/BS degree in Computer Science/Engineering or related fields
  • Experience of 5+ years as a SDET
  • Strong understanding of Web-based product and API development
  • Exposure to various testing methodologies and the complete software development process, not just the testing life cycle
  • Proficiency in JavaScript and at least one another programming language such as Java, C#, and Python



  • Experience in the advertising and/or eCommerce domains
  • Strong knowledge of database systems, data warehousing concepts
  • Highly scalable cloud-based software and deployments
  • Proficiency in web services / API design
  • Experience in agile software development
  • Exposure to behavior driven development
  • GUI testing / Cross-browser testing
  • Testing suits and frameworks – Zephyr, TestPad, MS Test, NUnit, TestNG, Selenium WebDriver, SilkTest, etc.
  • Related experiences with using Kafka, Redis, Hive, Hadoop, Spark
  • Have a broad knowledge of Amazon Web Services, Distributed systems, Service-oriented / Message-oriented architecture
  • Proficiency in SQL and/or NoSQL

Recruitment Process and Others

1. Recruitment Process: Application Review - Phone Interview - Onsite Interview - Offer  
(The recruitment process may be different depending on the job and may be changed due to scheduling and circumstances.)
2. Others:
a. This job post may be closed early if all openings are filled.   
b. If there is any false information in the application, the offer may be cancelled.
c. Veteran status or disability will not result in any disadvantages in the recruitment process.
d. Interview schedules and the results will be informed to the applicant via the e-mail address submitted at the application stage.


Career Path

  • Senior Software Engineer
  • Software Engineering Manager
  • Technical Program Manager
  • Product Manager (Product Owner)
  • Tech Recruiter


QA Mock System

The biggest challenge and goal for Quality Assurance (QA) testers is to conduct a final test for a product thoroughly to enable a smooth release of the product in terms of both quality and quantity. Then, what type of test is employed? There are various types of testing; functional test, interface test, performance test, and etc. For any test, what is most critical is data. Without sufficient test data, it is unlikely to ensure high coverage and quality of the product. QA testers are all well aware of this. Then, how can QA testers enrich, create and manage test data efficiently?

Evolving the Coupang Data Platform

Coupang is revolutionizing e-Commerce market of South Korea with last-mile delivery and rethinking discovery of products on mobile first platform. Our mission is to create a world in which Customers ask, “How did I ever live without Coupang?”

Being a data driven company, we rely heavily on data decisions right from customer journey to the best algorithm to optimize space in a fulfillment center. We use data to find bottlenecks at each step of the process and move faster as a company. To keep up with the constant demand for excellence in scale, availability, latency, concurrency, and fast data growth, we must constantly evolve our Data Platform.

Benefits and Rewards

  • Flex Time

  • Open Culture

  • Team Outings

  • Collaboration

  • International Interaction

Our mission is global

Coupang is a global business with offices in Seoul, Shanghai, Beijing, Silicon Valley, Seattle and Los Angeles.

Seoul, Korea

Our Korea office is located in downtown Seoul near Lotte World Hotel and Lotte World Mall.

Shanghai, China

Our office in Shanghai is conveniently situated near to restaurants and gyms, as well as to the Evergreen Hotel and the Chamtime Square Shopping Mall.

Beijing, China

Our Beijing office is located in One Indigo, a Grade A-listed office tower. From our space on the 12th floor, you can take in expansive views of Indigo Park, the Ba River and the Beijing skyline. We are conveniently situated a few steps away from the Indigo Shopping Mall, and parking is easily available.

Mountain View, United States

Our Mountain View office is located in the Silicon Valley area across from the NASA Ames Research and Visitor Center.

Seattle, United States

Our Seattle office can be found in the heart of downtown Seattle near restaurants and tourist attractions such as the Pike Place Market.

Los Angeles, United States

Our office in Los Angeles is located in the Riverside area right next to the Sycamore Canyon Wilderness Park.

Sign up for job alerts

Interested InSelect a job category from the list of options. Select a location from the list of options. Finally, click “Add” to create your job alert.

  • Software Development Engineers, Seoul, Seoul, South KoreaRemove