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Coupang

Sr. Staff Backend Engineer (Ads Tech)

Sorry, this job was removed at 08:12 p.m. (PST) on Thursday, Jan 08, 2026
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In-Office
Seattle, WA
In-Office
Seattle, WA

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We exist to wow our customers. We know we’re doing the right thing when we hear our customers say, “How did we ever live without Coupang?” Born out of an obsession to make shopping, eating, and living easier than ever, we’re collectively disrupting the multi-billiondollar e-commerce industry from the ground up. We are one of the fastest-growing e-commerce companies that established an unparalleled reputation for being a dominant and reliable force in South Korean commerce.

We are proud to have the best of both worlds — a startup culture with the resources of a large global public company. This fuels us to continue our growth and launch new services at the speed we have been since our inception. We are all entrepreneurs surrounded by opportunities to drive new initiatives and innovations. At our core, we are bold and ambitious people that like to get our hands dirty and make a hands-on impact. At Coupang, you will see yourself, your colleagues, your team, and the company grow every day.

Our mission to build the future of commerce is real. We push the boundaries of what’s possible to solve problems and break traditional tradeoffs.

Join Coupang now to create an epic experience in this always-on, high-tech, and hyper-connected world.

Role Overview

As our Staff Software Engineer for Coupang Ads Group, you will be responsible for designing and developing our advertising platform to support Coupang’s fast business growth. Coupang is investing in building a world-class Advertising business where we run relevant ads across our website and Mobile App. We are building the next generation of products and services to fuel Coupang ad business’s future growth by providing self-service advertising capabilities to our Sellers and Suppliers.

We are looking for passionate software engineers to build highly scalable online systems to power our advertisement products. You will be working on search, recommendation, and machine learning technologies and systems to power and enhance our advertisement products. You are responsible for developing low latency, highly available, large-scale services and systems and building APIs for programmatic integrations.

Are you passionate about building low latent and highly scalable distributed services? Are you passionate about building AI-oriented systems and platforms? Do you want to be part of huge opportunities in building a world-class Coupang Advertising business? If so, let’s chat!

What you will do

  • Identify opportunities to initiate technical investments and drive milestones within the Ads Serving Platform.
  • Design and construct robust, scalable, and efficient distributed ad systems.
  • Execute and deliver impactful system solutions that benefit multiple teams in Ads.
  • Drive and manage multiple impactful initiatives and projects concurrently.
  • Mentor and provide guidance to fellow team members.

Basic Qualifications

  • Bachelor's degree in computer science, Electrical Engineering, Math, or a closely related field
  • 8 years of experience in backend software development
  • Proficiency in Java and the Spring Framework
  • Experience working in cloud environments, particularly AWS
  • Demonstrated experience in building and maintaining highly available, distributed systems

Preferred Qualifications

  • Experience in designing and constructing machine learning-based applications and systems.
  • Experience in designing and constructing systems and applications for advertising/search advertising, search, and recommendations.
  • Experience in leading cross-team system design and execution.

Pay & Benefits

Our compensation reflects the cost of living across several US geographic markets. At Coupang, your base pay is one part of your total compensation. The base pay for this position ranges from $159,000/year in our lowest geographic market to $351,000/year in our highest geographic market.

Pay is based on several factors including market location and may vary depending on job-related knowledge, skills, and experience.

General Description of All Benefits

  • Medical/Dental/Vision/Life, AD&D insurance
  • Flexible Spending Accounts (FSA) & Health Savings Account (HSA)
  • Long-term/Short-term Disability
  • Employee Assistance Program (EAP) program
  • 401K Plan with Company Match
  • 18-21 days of the Paid Time Off (PTO) a year based on the tenure
  • 12 Public Holidays
  • Paid Parental leave
  • Pre-tax commuter benefits
  • MTV - [Free] Electric Car Charging Station

General Description of Other Compensation

“Other Compensation” includes, but is not limited to, bonuses, equity, or other forms of compensation that would be offered to the hired applicant in addition to their established salary range or wage scale.

Coupang is an equal opportunity employer. All qualified applicants will receive consideration for employment without regard to actual or perceived race (including traits historically associated with race, including but not limited to hair texture and protective hair styles), color, religion, religious creed (including religious dress and grooming practices), sex or gender (including pregnancy, childbirth, breastfeeding, and medical conditions related to pregnancy, childbirth or breastfeeding), gender identity, gender expression, sexual orientation, ,ancestry, national origin (including language use restrictions), age (40 and over), physical or mental disability, medical condition, genetic information, HIV/AIDS or Hepatitis C status, family status (including but not limited to marital or domestic partnership status), military or veteran status, use of a trained dog guide or service animal, political activities or affiliations, ancestry, citizenship, family and medical leave status, status as a victim of any violent crime, or any other characteristic or class protected by the laws or regulations in the locations where we operate.

Requisition ID: R0066224

Coupang Seattle, Washington, USA Office

720 Olive Wy, Seattle, WA, United States, 98101

What you need to know about the Seattle Tech Scene

Home to tech titans like Microsoft and Amazon, Seattle punches far above its weight in innovation. But its surrounding mountains, sprinkled with world-famous hiking trails and climbing routes, make the city a destination for outdoorsy types as well. Established as a logging town before shifting to shipbuilding and logistics, the Emerald City is now known for its contributions to aerospace, software, biotech and cloud computing. And its status as a thriving tech ecosystem is attracting out-of-town companies looking to establish new tech and engineering hubs.

Key Facts About Seattle Tech

  • Number of Tech Workers: 287,000; 13% of overall workforce (2024 CompTIA survey)
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  • Key Industries: Artificial intelligence, cloud computing, software, biotechnology, game development
  • Funding Landscape: $3.1 billion in venture capital funding in 2024 (Pitchbook)
  • Notable Investors: Madrona, Fuse, Tola, Maveron
  • Research Centers and Universities: University of Washington, Seattle University, Seattle Pacific University, Allen Institute for Brain Science, Bill & Melinda Gates Foundation, Seattle Children’s Research Institute

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