[Coupang Pay] Staff, Back-end Engineer (Fintech SRE)

About Coupang: At Coupang we are building the future of ecommerce. 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 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?” 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. About CoupangPay : Coupang Pay focuses on delivering innovative payment and financial services solutions to everyone who uses the Coupang app — from customers buying products on Coupang.com, to marketplace vendors, and restaurants that offer their services via Coupang Eats. We develop solutions with our latest tech innovations to serve the growing needs of Coupang’s customers in Korea and Taiwan. This includes Coupay, an online wallet with a proprietary one-touch payment capability. About the role : As a Staff Site Reliability Engineer (SRE) in CoupangPay, you will play a pivotal role in ensuring the reliability, scalability, and performance of our critical systems and services. You will be a technical leader, driving the design, implementation, and optimization of complex systems that meet the demands of a high-availability environment. This role requires deep expertise in the Observability Engineering (OE) stack—including Mimir, Loki, Tempo, and Grafana—and Terraform-based automation. Experienced in setting up, tuning, and scaling observability platforms to support business-critical services with high reliability and performance . As a Staff SRE engineer, you will be involves collaborating with cross-functional teams to architect solutions, identify and resolve system bottlenecks, and establish best practices in operational excellence. With a focus on automation, observability, and incident management, you will also mentor junior engineers, foster a culture of reliability, and contribute to the strategic direction of our product engineering initiatives. This is a unique opportunity to make a significant impact on the stability and scalability of our technology ecosystem. Responsibilities System Reliability and Performance Ensure the reliability, availability, and performance of critical systems and services. Proactively identify and address system bottlenecks, failures, and performance issues. Technical Leadership Lead the design, implementation, and optimization of scalable and fault-tolerant architectures. Provide guidance and mentorship to junior engineers, fostering technical growth. Automation and Tooling Develop and enhance automation tools to streamline operational processes and improve efficiency. Champion automation-first principles to reduce manual toil and operational overhead. Observability and Incident Management Build and operate OE stack. Involve in performance tuning, cost optimisation and observability initiatives to best serve the interest of the business. Drive incident response, root cause analysis, and post-incident reviews to improve systems. Collaboration and Best Practices Partner with cross-functional teams (e.g., development, product, and infrastructure) to build robust systems. Define and implement best practices for reliability engineering, including CI/CD pipelines and infrastructure as code. Strategic Contributions Influence the strategic direction of infrastructure and platform engineering initiatives. Evaluate and implement new technologies to enhance system resilience and operational capabilities. Operational Excellence Drive continuous improvement in operational processes, reducing time to resolution for incidents. Promote a culture of accountability, innovation, and reliability throughout the engineering organization. Preferred Qualification Strong proficiency in programming languages such as Python, Go, or similar. In-de ... (truncated, view full listing at source)