Coupang

Senior Staff Ranking Engineer, Personalization

Coupang
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21 days ago
Mountain View, CA, USAStaff+
H1B sponsor

Base Salary

$152k - $277k/yr

Responsibilities

  • Design features and build large-scale machine-learning models and systems for ad targeting, relevance, ranking, and engagement.
  • Implement ML systems for search ranking, semantic retrieval, query understanding, and personalized product discovery.
  • Advance search relevance and user-intent modeling using LLMs, embedding-based retrieval, vector search, and multimodal learning.
  • Build and optimize scalable, reproducible ML pipelines using Apache Spark, Airflow, Kubeflow, and MLflow.
  • Define and track performance metrics to evaluate model impact and identify improvement opportunities.
  • Collaborate with product, engineering, and data science teams to align technical solutions with business goals.
  • Mentor and develop engineering talent and promote technical excellence and continuous learning.

Requirements

  • Bachelor’s degree in computer science, electrical engineering, mathematics, statistics, or a closely related field.
  • At least 7 years of professional experience in applied machine learning.
  • Experience with machine learning, deep learning, statistical modeling, and production-grade ML systems.
  • Proficiency in Python and/or Java.
  • Preferred qualifications include a master’s degree or PhD, search or recommendation-engine experience, and experience with LLMs, embeddings, and vector search.
  • Preferred experience includes AWS, Google Cloud Platform, Vertex AI, BigQuery, SageMaker, TensorFlow, PyTorch, Scikit-learn, Keras, XGBoost, LightGBM, H2O.ai, MLflow, Kubeflow, and Weights & Biases.
  • Ability to lead cross-functional teams, communicate complex technical concepts, work independently, and manage ambiguity in fast-paced environments.

Benefits

  • Base pay is listed separately from total compensation; annual bonus opportunity is 0–20% of base salary.
  • Medical, dental, vision, life, AD&D, disability, FSA, HSA, EAP, and 401(k) with company match benefits.
  • 18–21 days of paid time off annually based on tenure and 12 public holidays.
  • Six weeks of paid parental leave.
  • Pre-tax commuter benefits and free electric-car charging.

Tech Stack

Apache AirflowApache SparkAWSGoogle BigQueryGoogle Cloud PlatformH2O.aiJavaKerasLightGBMMLflowPythonPyTorchscikit-learnTensorFlowXGBoost
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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