Staff System Engineer

Company Introduction

We exist to wow our customers. We know we’re doing the right thing when we hear our customers say, “How did I ever live without Coupang?” Born out of an obsession to make shopping, eating, and living easier than ever, we’re collectively disrupting the multi-billion-dollar 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.

Role Overview

As a Systems & Platform Engineer, you will design and develop responsive applications, scalable APIs, and domain-specific AI models while driving performance, reliability, and automation. You will leverage modern technologies across frontend, backend, cloud, and infrastructure domains to deliver innovative AI-powered enterprise solutions.

What You Will Do

• Build and maintain modern, responsive, and high-performance agentic operations platform.
• Design, develop, and optimize small language models for domain-specific and enterprise applications.
• Fine-tune SLMs to improve accuracy, performance, and task-specific capabilities.
• Optimize models for low-latency inference and edge deployments.
• Develop inference pipelines and evaluate model performance across various environments.
• Monitor, benchmark, and improve model efficiency, accuracy, and scalability.
• Maintain documentation, experiment tracking, and model governance practices.
• Build scalable RESTful APIs and backend services
• Design and maintain relational/NoSQL databases
• Implement security, authentication, and authorization logic
• Ensure high availability, fault tolerance, and robustness of server-side applications
• Integrate third-party APIs and services securely and efficiently

Basic Qualifications

• Bachelor’s degree or Master's degree with 7+ years of total experience
• Strong Python, React.js, NodeJS, NextJS, skills with component lifecycle, hooks, and state management HTML5, CSS3, JavaScript (ES6+), and modern frameworks (e.g., Tailwind, SCSS) Git, REST APIs, Webpack, and CI/CD pipelines
• Strong grasp of API design, data modelling, and error handling
• Experience with monitoring tools (Prometheus, Grafana)
• Expertise in Ansible, Terraform and shell scripting
• Proficient in PostgreSQL, MySQL, or MongoDB

Preferred Qualifications

• Good understanding of CI/CD, configuration management, and cloud platforms like AWS.
• Familiarity with message brokers (RabbitMQ, Kafka)
• Experience with Docker, Git, and API tools

Type of work model

• Hybrid

Privacy Notice

• Your personal information will be collected and managed by Coupang as stated in the Application Privacy Notice located below. https://privacy.coupang.com/en/land/jobs/