Principal/Senior Ranking Engineer

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 a Ranking Engineer working on Search Quality, you have the opportunity to work with world-class Search Engineers who have been worked for Google, Amazon, Pinterest, etc. You will define and solve hard problems to improve search quality, increase GMV, conversion rate, as well as understand customer’s intention better. We are desired to provide customer a friction-less search engine and help customer to find useful products. Your ideas and experience would help us achieve the goal.


Job Responsibilities:

  1. Dive deep into search ranking results and understand defects and problems
  2. Design fast iterated experiments on Java based ranking framework using statistical or machine learning methods to improve search quality and business metrics.
  3. Collaborate with different teams, including product managers and knowledge masters to deliver search products.



  1. Bachelor’s degree or higher in Computer Science, Computer Engineering, or related majors
  2. 3+ years of coding experience using at least one of the following languages, Java, C++ or Python.
  3. 2+ years of solid work with data structures, fundamental algorithms or system design



  1. Hands-on experience with Search Engine/Recommendation Systems, in but not limited to one of the following areas:
  • Ranking algorithms based on statistical/machine learning modeling and its implementation
  • Search framework design and implementation, like Lucene, Solr, Elasticsearch
  • Indexing or search ranking system development
  1. Hands-on experience on big data platform and parallel computation, like Hadoop, Spark
  2. Ability to analyze, simplify and solve problems
  3. Good communication and team play
  4. Master or Ph.D degree in related majors


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