Senior Penetration Tester (Cyber Security) Vice President

Citigroup Inc.; Singapore; On-site; SGD 120,000 - 180,000; Full time

Job summary

Citi is seeking a Senior Penetration Tester to lead vulnerability research, whitebox testing, and source code reviews across enterprise applications and APIs. The role emphasizes proactive security, collaboration with development teams, and remediation guidance.

The ideal candidate will have extensive experience in vulnerability research, exposure to multiple languages, and familiarity with OWASP Top 10 and API security practices.

Qualifications

• 6+ years of experience in penetration testing, ethical hacking, or application security.
• Proven expertise in vulnerability research and exploit development.
• Strong programming skills in one or more languages (Java, C#, Python).

Responsibilities

• Conduct in-depth vulnerability research and develop POC exploits to demonstrate risk.
• Perform comprehensive whitebox testing using source code and design documentation.
• Review source code across languages to identify security flaws and misconfigurations.
• Evaluate third-party components for known vulnerabilities (CVEs).
• Provide remediation guidance to development teams for secure coding practices.
• Develop and improve security testing tooling and automation (SAST/DAST).
• Prepare detailed reports with risk levels and mitigations for technical and non-technical audiences.
• Stay updated on latest threats, techniques, and best practices.

Skills

Penetration testing

Vulnerability research

Source code review

Programming: Java, C#, Python

OWASP Top 10 & API security

SAST/DAST tools

Communication skills

Security certifications (OSCE, GWAPT,

Education

Bachelor’s or Master’s in CS / InfoSec

Tools

SAST tools

DAST tools

Source code review tooling

Job description

Discover your future at Citi

Citi is a preeminent banking partner for institutions with cross-border needs, a global leader in wealth management, and a valued personal bank in its home market of the United States. Citi does business in more than 160 countries and jurisdictions, providing corporations, governments, investors, institutions, and individuals with a broad range of financial products and services.

About the job

Citi is seeking a highly skilled and experienced penetration tester with a specialized focus on vulnerability research, third-party component analysis, and advanced whitebox testing methodologies, including comprehensive source code review. The successful candidate will play a critical role in identifying, exploiting, and providing remediation guidance for complex security vulnerabilities within Citi's diverse technology landscape. This role demands deep technical expertise, a proactive approach to security challenges, and the ability to work collaboratively with development teams to enhance the security posture of our applications and infrastructure.

Who we are

This team specializes in conducting deep-dive penetration testing on a variety of Citi applications (Web, Mobile, Thick Client, and APIs) by manually identifying, researching, validating, and exploiting various known and unknown application security vulnerabilities.

What You’ll Do

As a Senior Penetration Tester on our Offensive Security & Vulnerability Management team, you are responsible for:

• Vulnerability Research & Exploitation: Conduct in-depth research to discover new attack vectors and zero-day vulnerabilities in enterprise applications, systems, and third-party components. Develop proof‑of‑concept exploits to effectively demonstrate risk.
• Whitebox Penetration Testing: Perform comprehensive whitebox penetration tests, leveraging access to source code, design documentation, and internal system knowledge to uncover sophisticated security flaws that blackbox testing might miss.
• Source Code Review: Conduct manual and automated source code reviews across various programming languages (e.g., Java, C#, Python, JavaScript) to identify security vulnerabilities, misconfigurations, and adherence to secure coding practices.
• Third-Party Component Analysis: Evaluate the security of third‑party libraries, frameworks, and open-source components integrated into Citi's applications. Identify known vulnerabilities (e.g., CVEs) and assess potential risks.
• Remediation Guidance: Provide clear, concise, and actionable remediation recommendations to development teams, offering expert advice on secure coding, configuration, and architectural solutions.
• Tooling & Automation: Utilize and contribute to the development of advanced security testing tools, AI‑augmented static analysis, and dynamic analysis (DAST) solutions to improve efficiency and coverage.
• Reporting & Communication: Prepare detailed technical reports outlining findings, risk levels, and recommended mitigations for both technical and non‑technical audiences.
• Stay Current: Continuously research and stay abreast of the latest security threats, vulnerabilities, attack techniques, and industry best practices.

Job Skills/Qualifications:

• 6+ years of experience in penetration testing, ethical hacking, or application security, with a significant focus on whitebox testing and/or source code review.
• Proven expertise in vulnerability research, including the ability to identify novel vulnerabilities and develop reliable exploits.
• Strong proficiency in at least one major programming language (e.g., Java, C#, Python) and familiarity with others.
• In‑depth understanding of common web application vulnerabilities (OWASP Top 10) and API security best practices.
• Experience with static application security testing (SAST) tools and dynamic application security testing (DAST) tools.
• Excellent written and verbal communication skills, with the ability to articulate complex security issues to diverse audiences.
• Ability to work independently and as part of a team in a fast‑paced, dynamic environment.
• Relevant industry certifications such as OSCE, GIAC GWAPT, GPEN, GXPN, or similar.

An ideal candidate will have both an engineering and security background. However, irrespective of your current role, if you have a Bachelor’s or Master’s degree in Computer Science, Information Security, or a related field, or equivalent practical experience and meet most of the above‑listed requirements, then don't miss this opportunity to join our team.

Job Family Group:

Technology

Job Family:

Information Security

Time Type:

Full time

Most Relevant Skills

Please see the requirements listed above.

Other Relevant Skills

For complementary skills, please see above and/or contact the recruiter.

Citi is an equal opportunity employer, and qualified candidates will receive consideration without regard to their race, color, religion, sex, sexual orientation, gender identity, national origin, disability, status as a protected veteran, or any other characteristic protected by law.

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