APPSIXER · 6 hours ago
Software Engineer III
United States
Contract
Remote
Senior Level, Lead/Staff
8+ years expAPPSIXER is 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 for mainframe security and z/OS administration, ensuring secure, compliant, and reliable operation of mission-critical systems.
Information Technology & Services
Responsibilities
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 BlueZone
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
Qualification
Required
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
5+ years working with z/OS UNIX System Services (OMVS)
5+ years working with 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
Preferred
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 (BlueZone)
VTAM session management tools
SMP/E
RMF, SMF, WLM
JCL
GRS
VSAM
TSO
Company
APPSIXER
About Appsixer At Appsixer, we specialize in Core IT and Professional Staffing Solutions designed to help organizations build high-performing teams and achieve sustainable growth.
201-500 employees
Funding
Current Stage
Growth StageCompany data provided by crunchbase