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Senior Principal Software Engineer (Coupang Media Group)

Seattle, United States

1804863 Aug. 08, 2019 eCommerce

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: 

As our  Principal Engineer/Architect for Coupang Media Group, you will be responsible for developing, designing the new features for our advertising platform.

The Coupang Media Group (CMG) is responsible for providing vendors that sell their products on Coupang a host of marketing products and services.  We launched Product Ads which is a bidded performance advertising marketplace late in 2018.  We have grown rapidly to over 10,000 active advertisers and 150M daily ad impressions in only 5 months’ time. Our group is responsible for advertising brands and products inside our ecommerce website. To get an idea of how valuable that is, both Alibaba and Amazon make more money on advertising than on selling products. 

This is an opportunity to be part of building up a new development organization with strong revenue potential inside a successful company. We’re building full-stack engineering teams to handle large scale advertising problems, including real-time behavioral targeting, auctioning and bidding systems and search based advertising.

We are in the growth phase of the organization, so you’ll be a part of managing the transition from growth phase to enterprise processes.

In this role you will be responsible for architecting and building our new ad engine and eventually extend it into a full ad exchange, DSP, and SSP. We currently handle about 1bn impressions per day from internal traffic alone.

Key technologies you will work with are  Java, node.js, express.js, react.js, Postgres, AWS.

Key Responsibilities:  

  • Developing, architecting and driving the systems for Coupang Media Group.
  • Implement full stack, high scale production systems with fault-tolerance and monitoring systems
  • Building durable code, and architecture with the ability to scale with very large data volumes.
  • Build and implement design frame work and self-service design
  • Effectively lead and mentor the junior developers
  • Communicate clearly and concisely with the team members, peers and leadership team



  • 10+ years of experience building web -based products
  • Strong architectural skills with highly scalable web technologies and data stores
  • Excellent communicator, both to technical and business audiences
  • Experience with JS-based technologies
  • Strong problem-solving skills
  • Strong skills in data structures, algorithms and object-oriented design
  • Self -starter and innovator who likes to solve complex problems
  • Proven track record of taking ownership and successfully delivering results
  • Ability to deal with ambiguity in business and technology
  • Ability to work in multi-cultural, cross functional team
  • Bachelors’ degree in computer science, engineering, mathematics, physics, science or equivalent



  • Experience with advertising systems/Search advertising/Advertising Marketplace
  • Experience with high-scale systems
  • Understanding of performance tradeoffs, load balancing and operational issues
  • Experience with service-oriented architecture and web application/services development
  • Experience working with AWS (Amazon web services)
  • Bilingual in Korean and English
  • Experience working in startups
  • Experience with Machine Learning, Elasticsearch.


Coupang is an equal opportunity employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex or gender (including pregnancy, gender identity, gender expression, sexual orientation, transgender status), national origin, age, disability, medical condition, HIV/AIDS or Hepatitis C status, marital status, military or veteran status, use of a trained dog guide or service animal, political activities, affiliations, citizenship, or any other characteristic or class protected by the laws or regulations in the locations where we operate. If you need assistance and/or a reasonable accommodation in the application or recruiting process due to a disability, please contact us at

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