Senior Staff Machine Learning Engineer (AI & Knowledge)

About the role

At Coupang we invest in delivering the best product experience for our customers. The AI and Knowledge Engineering team’s mission is to provide cutting‑edge technical solutions that optimize the eCommerce experience. We innovate across Knowledge Graphs, AI agents, large language models, AIGC, machine learning, NLP, computer vision and multi‑modal models.

Key responsibilities

• Work on GenAI and AI agents systems to solve complex eCommerce scenarios.
• Develop large language and vision understanding/generation models for predictive and compound AI applications.
• Train foundational models that support learning systems.
• Define processes and experiments for end‑to‑end foundation models.
• Build AI pipelines for storing and serving foundational models.
• Mentor team members on data lakes, normalization, dimension reduction, visualization and statistical modeling.
• Ensure model training complies with security and regulatory requirements.
• Collaborate across teams to align foundational models with the company’s overall AI strategy.

Required profile

• 5+ years of data science experience building large‑scale foundational models for eCommerce.
• Expertise in large language model post‑training and deployment.
• Deep understanding of AI/LLM/AIGC/ML architecture.
• Strong statistical and mathematical background for metric definition, learning functions and result analysis.
• Significant experience with SQL, Python, PySpark, Scala and R.
• Proficiency in PyTorch, TensorFlow, Spark and BigQuery.
• Experience with cloud analytical stacks and inference platforms on AWS, Azure or other open‑source environments.
• Bachelor’s or Master’s degree in Computer Science, Mathematics or a related field.

Required skills

• Python
• SQL
• PySpark
• Scala
• R
• PyTorch
• TensorFlow
• Spark
• BigQuery
• AWS
• Azure
• Cloud analytical stacks (data lakes, warehouses, ETL pipelines)