Staff Reverse Engineer (Mobile Applications)

About Coupang:   We exist to wow our customers. We know we’re doing the right thing when we hear our customers say, “How did I ever live without Coupang?” Born out of an obsession to make shopping, eating, and living easier than ever, we’re collectively disrupting the multi-billion-dollar commerce industry from the ground up. We are one of the fastest-growing retail companies that established an unparalleled reputation for being a leading and reliable force in South Korean commerce. We are proud to have the best of both worlds — a startup culture with the resources of a large global public company. This fuels us to continue our growth and launch new services at the speed we have been since our inception. We are all entrepreneurial, surrounded by opportunities to drive new initiatives and innovations. At our core, we are bold and ambitious people that like to get our hands dirty and make a hands-on impact. At Coupang, you will see yourself, your colleagues, your team, and the company grow every day. Our mission to build the future of commerce is real. We push the boundaries of what’s possible to solve problems and break traditional tradeoffs. Join Coupang now to create an epic experience in this always-on, high-tech, and hyper-connected world.  

Job Overview:

We are seeking a highly skilled Reverse Engineer with a focus on mobile applications to uncover, analyze, and extract data from APIs used by popular eCommerce companies. This role sits at the intersection of security research, data engineering, and system-level programming. You will work closely with data teams to enable robust, scalable data pipelines by reverse-engineering client behavior and building tools to interface and extract data from undocumented APIs.

 

In this role, you will:

• Reverse engineer mobile applications to extract API behavior and authentication logic.
• Perform both static and dynamic analysis on mobile apps.
• Develop and maintain tools and scripts for hooking, decryption, traffic interception, and data extraction.
• Build and manage proxy environments between mobile devices and workstations for traffic inspection.
• Create custom Proxy Toolkits to manipulate and analyze HTTP/S traffic in real time.
• Implement and maintain native code hooking using tools like Frida, Xposed, or Substrate.
• Conduct ARM/x86 Assembly analysis for deeper insights into app behavior.
• Reverse engineer web frontend logic (e.g., JavaScript obfuscation, token generation) to extract or simulate client-side API interactions.
• Ensure bypass of security features such as anti-debugging, anti-emulation, and anti-hooking.

 

Qualifications

• Proficient in Python or Java. JavaScript is helpful
• Strong experience with reverse engineering tools like IDA Pro, Ghidra, Jadx, Binary Ninja, Radare2, and JEB.
• Skilled in using debuggers (e.g., x64dbg, GDB, LLDB, WinDbg) for live process inspection.
• For mobile: Deep understanding of mobile operating system internals, including Android (AOS) and iOS, and related file formats (APK, IPA, ELF, Mach-O, PE).
• Experience with network traffic analysis, including proxy mechanics and networking protocols.
• Familiar with memory management concepts (heap/stack, paging, virtual memory) and OS architecture (Linux/macOS/Windows).

 

Preferred Qualifications:

• Experience with web crawling and scraping.
• Knowledge of kernel-level development (e.g., socket drivers).
• Prior involvement with Android rooting or iOS jailbreaking (for mobile)
• Background in working with defenders/attackers in security research settings.
• Understanding of compiler internals and code auditing practices.

 

What You’ll Build

• A high-fidelity, reliable API data extraction layer from mobile/web clients.
• Automation pipelines for decryption, API emulation, and response parsing.
• Systems to support high-throughput scraping with anti-bot and anti-fraud defenses in mind.

 

Pay & Benefits Our compensation reflects the cost of labor across several US geographic markets. At Coupang, your base pay is one part of your total compensation. The base pay for this position ranges from $138,000/year in our lowest geographic market to $297,000/year in our highest geographic market. Pay is based on several factors, including market location, and may vary depending on job-related knowledge, skills, and experience.   General Description of All Benefits

• Medical/Dental/Vision/Life, AD&D insurance
• Flexible Spending Accounts (FSA) & Health Savings Accounts (HSA)
• Long-term/Short-term Disability
• Employee Assistance Program (EAP) program
• 401K Plan with Company Match
• 18-21 days of Paid Time Off (PTO) a year based on tenure
• 12 Public Holidays
• Paid Parental leave
• Pre-tax commuter benefits

General Description of Other Compensation “Other Compensation” includes, but is not limited to, bonuses, equity, or other forms of compensation offered to the hired applicant in addition to their established salary range or wage scale.   Equal Opportunities for All Coupang is an equal opportunity employer. All qualified applicants will receive consideration for employment without regard to actual or perceived race (including traits historically associated with race, including but not limited to hair texture and protective hair styles), color, religion, religious creed (including religious dress and grooming practices), sex or gender (including pregnancy, childbirth, breastfeeding, and medical conditions related to pregnancy, childbirth or breastfeeding), gender identity, gender expression, sexual orientation, ,ancestry, national origin (including language use restrictions), age (40 and over), physical or mental disability, medical condition, genetic information, HIV/AIDS or Hepatitis C status, family status (including but not limited to marital or domestic partnership status), military or veteran status, use of a trained dog guide or service animal, political activities or affiliations, ancestry, citizenship, family and medical leave status, status as a victim of any violent crime, or any other characteristic or class protected by the laws or regulations in the locations where we operate. Coupang is also committed to providing a safe work environment for its employees and its consumers. If you need assistance and/or a reasonable accommodation in the application of recruiting process due to a disability, please contact us at usrecruiting@coupang.com. Coupang is an equal opportunity employer. Our unprecedented success could not be possible without the valuable inputs of our globally diverse team.   R0059086