Staff Security Engineer, Penetration Tester

The role

The Staff Security Engineer will conduct hands-on penetration testing across web, mobile, API, and cloud-related environments. This person will identify vulnerabilities, communicate technical impact, and provide remediation guidance while working with the Korea security team.

What you will do

• Lead or execute authorized penetration-testing engagements across web applications, mobile applications, APIs, and cloud-related attack surfaces.
• Define testing scope, identify attack surfaces, select appropriate testing methods, and document evidence, limitations, and outcomes.
• Assess discovered vulnerabilities, validate technical impact, distinguish verified findings from false positives, and provide remediation guidance.
• Use Linux, command-line utilities, and penetration-testing tools to perform controlled testing and verify results.
• Build or modify scripts that support request automation, test-data processing, or security-test result analysis.
• Coordinate testing scope, ownership boundaries, escalation paths, status updates, and deliverables with the Korea security team and Taiwan stakeholders.
• Independently manage engagement priorities and review testing output to identify gaps and provide specific technical guidance.

Required qualifications

• Demonstrated hands-on penetration-testing capability across web, mobile, or API environments.
• Demonstrated experience using penetration-testing tools in Linux or command-line environments.
• Ability to assess vulnerabilities, explain supporting evidence and impact, and provide actionable remediation guidance.
• Experience testing multiple applications, external services, or internal applications through penetration-testing or legally authorized bug-bounty work.
• Offensive-security experience sufficient to carry out penetration-testing engagements.
• Fluency in both Mandarin Chinese and English, able to communicate security findings and remediation guidance in English and Mandarin Chinese.
• Ability to collaborate across Taiwan and Korea security activities, including scope coordination, responsibility boundaries, escalation, and delivery communication.

Nice to have

• Experience in Red Team or adversary-simulation experience in a complex application environments.
• Exposure to cloud-security testing, including architecture, identity and access, public interfaces, or configuration risks.
• Relevant offensive-security certification such as OSCP, OSCE, OSED, CREST, or SANS.
• Ability to demonstrate an authorized penetration-testing case covering scope, methodology, evidence, findings, limitations, and delivery outcome.
• Ability to complete a controlled attack-surface analysis and testing plan for a multi-interface application.
• Ability to compare remediation options based on risk reduction, constraints, and validation approach.
• Ability to prepare concise bilingual security summaries for technical and cross-regional stakeholders.
• A degree in Computer Science, Computer Engineering, or a related field.

Before you apply

• Application Review - Job Fit Interview - Focus 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.
• 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.

About the company

Coupang is reimagining the shopping experience with the goal of wowing each customer. Their services in Taiwan include Rocket Delivery and Rocket Overseas.