Software Engineer III

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Job Category: Engineer

Job Type: Onsite

Job Location: Houston Texas

Compensation: Depends on Experience

W2: W2-Contract Only;
Kindly note that applications on a C2C basis will not be considered for this role.

We are seeking a senior-level Mainframe Top Secret Security Administrator to support legacy systems and mainframe modernization initiatives. This role serves as a subject matter expert (SME) for mainframe security and z/OS administration, ensuring secure, compliant, and reliable operation of mission‑critical systems.

The ideal candidate has deep hands‑on experience with Top Secret Security (TSS), z/OS administration, certificate management, access controls, and mainframe operational support in highly regulated environments.

• Serve as the SME for Mainframe Top Secret Security (TSS) to maintain system security, compliance, and audit readiness
• Perform advanced z/OS systems administration, including configuration, upgrades, break/fix support, and ongoing maintenance
• Manage user access controls, security profiles, and certificate renewals (TLS/SSL, RSA keys, SFTP, FTPS)
• Provide technical support for system releases, upgrades, and infrastructure changes
• Monitor system performance, diagnose issues, and conduct root cause analysis
• Support mainframe production control, scheduled jobs, and batch processing
• Provide end‑user support for ISV tools such as Blue Zone
• Coordinate with network, customer support, and application teams to ensure stable daily operations
• Support data integration and change data capture processes (IMS, VSAM) as needed
• Contribute expertise to both legacy system operations and mainframe transformation initiatives

• 8+ years of hands‑on experience with Top Secret Security (TSS)
• 5+ years of hands‑on z/OS administration experience
• 5+ years working with: JES2, z/OS UNIX System Services (OMVS), Storage Management Subsystem (SMS)
• 3+ years of experience with TLS configuration, including certificates, SSL, RSA keys, SFTP, and FTPS
• Strong understanding of mainframe security, compliance, auditing, and risk mitigation

• Experience with performance monitoring and initial performance analysis
• Experience with Informatica Power Exchange Administration
• Experience with REXX scripting

• z/OS Operations
• z/OS Networking (VTAM, TCP/IP)
• Automated job scheduling tools (e.g., JOBTRAC)
• Terminal emulation tools (Blue Zone)
• VTAM session management tools
• SMP/E
• RMF, SMF, WLM
• JCL
• GRS
• VSAM
• TSO

• Ability to access secure environments via remote access tools (e.g., Go To My PC)
• May be required to work evenings, weekends, or holidays with prior approval