Senior Mainframe Security & Penetration Tester

Truist; Raleigh (NC); On-site; USD 140,000 - 180,000; Full time

Benefits offered by this job

Health insurance

401k plan

Paid time off

Job summary

Truist, a leading financial services company in the United States, seeks an experienced security engineer specializing in penetration testing of mainframe environments (z/OS). You will identify vulnerabilities, validate attack paths, and deliver clear remediation guidance to reduce risk.

Collaborate with application teams and risk partners, contribute to testing playbooks, and mentor peers while supporting Eastern Time business hours. Remote work may be considered for highly qualified candidates.

Qualifications

• Bachelor’s degree or equivalent education, training, and work-related experience.
• Minimum of 7 years of experience in security engineering or related cybersecurity roles.
• Deep knowledge of cybersecurity principles, theories, and concepts.
• Proven experience in software development lifecycle security practices.
• Deep knowledge of threat modeling, security testing, and penetration testing.
• Experience implementing and managing complex information security technologies.

Responsibilities

• Conducts black box, grey box and assumed breach tests of enterprise z/OS environments, covering the USS, RACF/ACF2/Top Secret subsystems, CICS, IMS, Db2, MQ, JCL, JES2, TSO/ISPF, and network services.
• Uses manual techniques and scripting (REXX, JCL, Assembler, Python) and offensive tooling to enumerate users and resources, map datasets, access unprotected spool and job output, and exploit misconfigurations.
• Evaluates exploitability and business impact and applies sound judgment when determining finding severity and risk.
• Documents findings with clear reproduction steps, supporting evidence, impact statements, and practical remediation recommendations.
• Presents and defends technical findings in discussions with application teams, mainframe engineers, technology leaders, risk partners, and other stakeholders.
• Performs validation and retesting to confirm remediation and risk reduction, and maintains testing evidence for audit/compliance (PCI DSS, SOX).
• Partners with internal and external testing teams to improve mainframe testing coverage, playbooks, tooling, automation, and repeatable processes.
• Performs peer reviews of penetration testing reports and mentors security professionals.
• Maintains knowledge of mainframe attack techniques, security controls, platform changes, and industry threats.

Skills

Penetration testing

Threat modeling

Security testing

Automation

Complex information security

Technical writing

Independent work

Education

Bachelor’s degree or equivalent

Tools

RACF

ACF2

Top Secret

CICS

DB2

JES2

JCL

TSO/ISPF

REXX

Python

Job description

Truist, a leading financial services company in the United States, seeks an experienced security engineer specializing in penetration testing of mainframe environments (z/OS). You will identify vulnerabilities, validate attack paths, and deliver clear remediation guidance to reduce risk.

Collaborate with application teams and risk partners, contribute to testing playbooks, and mentor peers while supporting Eastern Time business hours. Remote work may be considered for highly qualified candidates.