Senior Staff, Back-end Engineer (Gateway Services)

What You Will Do • Design and implement Service Mesh architecture and fine-grained traffic control systems in large-scale microservices environments • Develop and enhance core infrastructure components related to traffic management, including service discovery, load balancing, and resiliency mechanisms • Build and operate Service Mesh components using technologies such as Istio and Envoy within Kubernetes environments • Architect and develop workload and service management infrastructure for large-scale distributed systems • Design and implement high-performance infrastructure components using Go, Rust, or C++ • Simplify complex infrastructure problems into scalable and executable solutions aligned with Coupang's leadership principles (Move with Urgency, Ruthless Prioritization) • Drive platform scalability, reliability, and operational excellence, setting high standards for system design and architecture • Perform deep root cause analysis of critical system issues and proactively prevent recurrence • Collaborate with platform teams and technical leaders to improve system scalability and unlock new innovation opportunities • Act as a technical leader and evangelist, promoting Service Mesh and traffic management best practices across the organization Basic Qualifications • Bachelor's degree or higher in Computer Science or a related technical field • 12+ years of software development experience with at least 2+ years in a Technical Lead role • Experience in designing and implementing traffic management solutions for large-scale systems • Hands-on experience in designing and building large-scale distributed systems within the past 3 years • Strong experience in designing and implementing traffic management solutions at scale • Proven expertise in Service Mesh technologies (e.g., Istio, Envoy) • Strong programming skills in Go, Rust, or C++, with a track record of delivering mission-critical systems • Experience with cloud platforms such as AWS, Azure, or GCP • Strong problem-solving skills with the ability to independently drive complex technical initiatives • Excellent communication and collaboration skills across cross-functional teams Preferred Qualifications • Deep understanding of networking fundamentals including VPCs, subnets, routing, gateways, and service networking • Strong knowledge of modern microservices architecture and API design patterns at scale • Experience building high-performance, large-scale distributed systems • Experience with Kubernetes ecosystem tools (e.g., ArgoCD, SPIFFE) • Ability to manage competing priorities in a fast-paced environment and lead large-scale project delivery • Experience providing technical leadership in platform or infrastructure engineering teams • Demonstrated ability to influence organization-wide technical decisions and drive engineering excellence Recruitment Process and Others Recruitment Process • Application Review - 1st Interview - 2nd Interview - Offer • The exact nature of the recruitment process may vary according to the specific job and may be changed due to scheduling or other circumstances. • Interview schedules and the results will be informed to the applicant via the e-mail address submitted at the application stage. Details to Consider • This job posting may be closed prior to the stated end date for application if all openings are filled. • Coupang has the right to rescind an offer of employment if a candidate is found to have submitted false information as part of the application process. • Those eligible for employment protection (recipients of veteran's benefits, the disabled, etc.) may receive preferential treatment for employment in accordance with applicable laws. • Job titles and responsibilities may be subject to change depending on the candidate's overall experience, etc. This will be communicated to the candidate at the appropriate time before the offer. • Hiring may be restricted in case the legal qualifications required for hiring and work performance is not met. • This is a full-time regular position and includes 12 weeks of probation period; provided, however, the probationary period may be either skipped, shortened or extended if necessary for business purposes. 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/ Document Return Policy 1. This notification is given pursuant to Article 11 (6) of the Fair Hiring Procedure Act. 2. A job applicant, who has applied but not been finally selected for a position at Coupang (the "Company"), may request the Company to return his/her hiring documents submitted pursuant to the Fair Hiring Procedure Act. However, this will not apply where the hiring documents were submitted via the website of the Company or e-mail, or where the job applicant submitted those documents voluntarily without a request from the Company. In addition, if the hiring documents were destroyed due to a natural disaster or any other reasons not attributable to the Company, such documents will be deemed to have been returned to the job applicant. 3. A job applicant who wishes to request the return of his/her hiring documents pursuant to the main sentence of paragraph 2 above should fill out a "Request for Return of Hiring Documents" [Annex Form No. 3 in the Enforcement Rule of the Fair Hiring Procedure Act] and submit It by email (recruitingops@coupang.com). In such case, within fourteen (14) days from the date of identifying the receipt of the request, the Company will send the hiring documents to the job applicant's designated address via registered mail. Please be informed that the job applicant is required to pay the postage on the registered mail. 4. In preparation for a job applicant's request for the return of hiring documents pursuant to the main sentence of paragraph 2 above, the Company shall retain the original hiring documents submitted by the job applicant fo