Coupang

Staff Back-end Engineer [L6-1] (NCA Services)

Coupang
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3 days ago
Shanghai, ChinaStaff+

Responsibilities

  • Design and optimize the architecture of core advertising systems for bidding, ranking, and serving.
  • Build infrastructure for AI model training and evaluation, including data generation, simulation environments, and experimentation frameworks.
  • Deliver AI/ML systems end to end across offline training, online serving, A/B experimentation, and outcome evaluation.
  • Lead the AI-first transformation of core advertising modules and develop capabilities that can scale to other product lines.
  • Design and optimize low-latency online inference systems and maintain reliable, high-quality distributed services.

Requirements

  • Relevant background in computer science, mathematics, statistics, or a related field with strong theoretical foundations.
  • Ability to independently drive work from problem definition through business-result delivery.
  • Proficiency in Java and Python, with experience designing and launching large-scale distributed systems.
  • Understanding of asynchronous processing, concurrency, idempotency, and rate limiting.
  • Familiarity with mainstream deep learning frameworks and the training and deployment principles of CTR/CVR prediction and ranking models.
  • Experience designing and optimizing low-latency online inference systems.
  • Ability to use AI programming tools such as Cursor, Copilot, and Claude Code, and evaluate the quality of AI-generated code.
  • Advertising or recommendation-system experience is preferred.
  • Experience with advertising bidding, budget optimization, or ROAS projects is preferred.
  • Experience leading cross-team technical solutions and delivering projects with complex dependencies is preferred.
Coupang

About Coupang

5,001-10,000 employees

Coupang builds and operates a South Korea–focused e-commerce marketplace with an end-to-end logistics network (Rocket Delivery), plus food delivery, video streaming, and fintech under brands such as Coupang, Eats, and Play. Revenue comes from first-party retail, third-party marketplace services, advertising, and memberships (Rocket WOW). Founded in 2010, the company is headquartered in Seattle and is publicly listed on the NYSE (CPNG).

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