Cybersecurity Pentester - Red Team Operator

Job Title: Red Team Operator

Powering the world's payments ecosystem

ACI powers the payments ecosystem – globally, and you power ACI. You'll innovate, collaborate, and grow – in an energetic technology culture with decades of proven success. ACIers – in all roles and levels– are truly your colleagues and many are your friends. Our size and reach allow you to see the global impact of your work. You are visible, your talents are valued, and you are empowered to shape the future of payments.

Job Summary:

ACI Worldwide is hiring a Red Team Operator to help simulate advanced cyber adversaries and proactively identify security gaps across the organization. This role plays a critical part in protecting ACI's systems and data by executing realistic offensive security engagements and partnering with defensive teams to strengthen detection and response capabilities. The position offers hands-on involvement in cutting-edge Red Team operations, custom tool development, and emerging areas such as AI-driven offensive security.

Job Responsibilities:

• Help plan, develop, and execute Red Team engagements, including adversary emulation, war-gaming, and full-scope assessments (network, application, physical, and social engineering).
• Conduct reconnaissance, weaponization, initial access, lateral movement, privilege escalation, and exfiltration activities while evading detection.
• Collaborate with defensive teams to provide actionable insights, reports, and recommendations for security improvements.
• Develop custom tools, scripts, and techniques to bypass modern defenses
• Stay ahead of emerging threats by researching new TTPs (Tactics, Techniques, and Procedures)
• Participate in Purple Team engagements and help mature ACIs security posture
• Research, develop, and test AI capabilities in the offensive security space.

Knowledge, Skills and Experience Required for the Job:

• Bachelor's degree in computer science, MIS, or related field or equivalent experience.
• 2+ years of hands-on experience in offensive security, penetration testing, or red team operations.
• Proficiency with offensive security tools such as Cobalt Strike, Empire, Metasploit, Burp, and custom C2 frameworks.
• Experience with AI technologies, ideally local LLMs.
• Experience writing code in Python, PowerShell, C/C++, Go, Rust, etc. for tool development.
• Relevant certifications such as OSCP, OSCE, CRTO, or similar are highly preferred.
• Excellent communication skills with the ability to translate technical findings into business risk language.
• Strong written and verbal communication skills and a solid understanding of IT Security concepts to include security operations.
• Knowledge of network protocols, data flows and vulnerabilities.
• Knowledge of PCI and other industry compliance standards.
• The ideal candidate is a strategic thinker who thrives in autonomous environments, maintains an adversarial mindset, and is passionate about continuous learning in the evolving cybersecurity landscape. This is a high-impact role that directly contributes to protecting critical assets and data.

Work Environment:

• Standard work environment
• Travel required, may be domestic or international

Applicants must be currently authorized to work in the United States on a full-time basis. This position does not offer sponsorship for employment visa status or work permit now or in the future.

In return for your expertise, we offer opportunities for growth, career development, and a competitive compensation and benefits package—all within an innovative and collaborative work environment.