Application Security Engineer

We are seeking a hands-on Application Security Engineer to join our Security Engineering team in Los Angeles. You will play a key role in safeguarding our products and infrastructure by running our bug bounty program, coordinating third-party penetration testing, handling internal security requests, participating in red/blue team exercises, and helping shape our emerging AI security practices., * Bug Bounty Program Management: Operate and manage our public/private bug bounty programs on platforms such as HackerOne, including triaging incoming reports, interfacing with security researchers and triage teams, validating vulnerabilities, and driving remediation with engineering teams.

• Third-Party Penetration Testing: Coordinate and manage engagements with external penetration testing vendors, scope assessments, review deliverables, and track remediation to closure.
• Internal Security Testing Tickets: Own and execute internal security testing requests (tickets), including web/mobile application vulnerability assessments (black-box, grey-box, and white-box).
• Red Team / Adversarial Exercises: Participate in offensive and defensive security exercises (attack & defense drills) to strengthen our overall security posture.
• AI Security: Contribute to AI/LLM application security efforts, including LLM security testing, AI-assisted security automation, and assessing emerging AI-related threats.
• Provide actionable remediation guidance and clear communication to engineering teams, security leadership, and stakeholders.

• Bachelor’s degree in Computer Science, Cybersecurity, or related field (or equivalent practical experience).
• Solid understanding of the OWASP Top 10 and common web/mobile application vulnerabilities.
• Hands-on experience with web application vulnerability assessments and penetration testing.
• Familiarity with bug bounty platforms (e.g., HackerOne, Bugcrowd) and triage workflows.
• Strong communication skills; ability to translate technical findings into clear remediation guidance., * Professional proficiency in Mandarin Chinese (to collaborate effectively with global / Chinese-speaking teams).
• Relevant certifications such as OSCP, GWAPT, or similar. Experience with AI/LLM security testing and security automation.
• Experience coordinating third-party pentest vendors and managing remediation lifecycles.

• Bonus eligible
• Healthcare (medical, dental, vision, prescription drugs)
• Health Savings Account with Employer Funding
• Flexible Spending Accounts (Healthcare and Dependent care)
• Company-Paid Basic Life/AD&D insurance
• Company-Paid Short-Term and Long-Term Disability
• Voluntary Benefit Offerings (Voluntary Life/AD&D, Hospital Indemnity, Critical Illness, and Accident)
• Employee Assistance Program
• Business Travel Accident Insurance
• 401(k) Savings Plan with discretionary company match and access to a financial advisor
• Vacation, paid holidays, floating holiday and sick days
• Employee discounts
• Free weekly catered lunch
• Dog-friendly office (available at select locations)
• Free gym access (available at select locations)
• Free swag giveaways
• Annual Holiday Party
• Invitations to pop-ups and other company events
• Complimentary daily office snacks and beverages

SHEIN is a global online fashion and lifestyle retailer, offering SHEIN branded apparel and products from a global network of vendors, all at affordable prices. Headquartered in Singapore, with more than 15,000 employees operating from offices around the world, SHEIN is committed to making the beauty of fashion accessible to all, promoting its industry-leading, on-demand production methodology, for a smarter, future-ready industry.