Web Security Engineer(Pricing Intelligence)

About the Company:

As a part of Ecommerce Engineering team, we exist for wow customer experiences, world class service excellence and hyper growing revenue. To achieve this, we build scalable & extensible architecture to support fast business growth & expansion, we create high performance & resilient backend system to handle increasing customer requests and we setup stable & fault-tolerant mechanisms to guarantee the customer experience. Creating disruptive products & resilient platforms for customers with world-class talents and cutting-edge technology is our vision and our commitment to the company.

About the Role:

• Responsible for web-side protocol analysis and parameter reverse engineering, and improving solutions;
• Continuously iterate on-device attack and defense capabilities, and explore the construction of a fully automated adversarial system.

Qualifications:

• 3+ years of practical work experience in Web reverse engineering.
• Bachelor's degree or above in Computer Science, Software Engineering, Information Security, or related fields
• Successful reverse engineering experience with mainstream Websites (e.g., social media, e-commerce, finance) is required, enabling independent completion of the entire process from decomplication to logical analysis.
• Strong logical analysis and problem-solving skills are essential; the ability to quickly identify technical bottlenecks in the reverse engineering process and develop solutions.
• Preference will be given to candidates with information security certifications (e.g., CEH, OSCP) or experience contributing to open-source reverse engineering tools.
• Excellent documentation and communication skills are required; the ability to clearly present reverse engineering results and collaborate effectively with the team.
• Both English and Mandarin speaking is required.

Required Skills

• Proficient in JavaScript reverse engineering, with AST (Abstract Syntax Tree) analysis capabilities (Babel Parser), and familiar with common JS obfuscation (string encryption, control flow flattening) and deobfuscation techniques;
• Proficient in browser debugging (Chrome DevTools), automation frameworks (Puppeteer/Playwright), and experience with Chromium kernel modifications is a plus;
• Familiar with web anti-scraping measures (browser fingerprinting & behavior, TLS fingerprinting, etc.) and human-machine identification measures (click/slider CAPTCHA, reCaptcha, Akamai, etc.);
• Familiar with common application layer protocols (HTTP/WebSocket), and possess network packet capture and analysis capabilities (Charles/Wireshark);
• Familiar with common encryption algorithms (RSA/AES/HMAC) and interface signature mechanisms;
• Proficient in web security, with experience in discovering and exploiting OWASP Top 10 vulnerabilities, and familiar with WAF (Web Application Firewall) and other security protections;
• Possess development skills and be able to independently write automation tools.

Recruitment Process

• Application Review - Phone Interview - Onsite (or Virtual Onsite) Coding 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.

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