System One · 1 week ago
Sr or Lead zOS Mainframe Systems Engineer
Reston, VA
Contract
Hybrid
Senior Level, Lead/Staff
8+ years expSystem One is a leader in delivering outsourced services and workforce solutions across North America. They are seeking a Senior/Lead z/OS Mainframe Systems Engineer to support and modernize the client’s mainframe platform, focusing on system maintenance, troubleshooting, and performance optimization.
Staffing Agency
Responsibilities
Lead and review work performed by systems programmers, ensuring high-quality system operations and improvements
Coordinate with application teams (~20 COBOL/Java developers) and infrastructure stakeholders to ensure smooth mainframe platform operations
Provide hands-on support for CICS, DB2, MQ, batch processes, and mainframe tools (CA7, CA1, IBM RMM)
Guide RACF security administration and contribute to TLS/SSL, TCP/IP, and other mainframe networking initiatives
Troubleshoot system issues, perform root cause analysis (RCA), and validate implementations to maintain platform resiliency
Participate in IPLs, system upgrades, automation enhancements, and platform modernization initiatives
Work with the managed service provider to optimize services, improve platform performance, and enhance operational availability
Recommend improvements to scalability, resiliency, and reliability of applications and systems running on the z/OS platform
Qualification
Required
8–10 years supporting IBM z/OS Systems in a SYSPLEX environment
RACF – Security Administration (5–10 years)
z/OS Systems Programming (5–10 years)
CICS TS Systems Programming (5–10 years)
MQ Systems Programming (5–10 years)
DB2 usage (does not need to be systems programming level)
ISV Production installation experience
IBM System Automation support
Batch scheduling support – Control-M
Proven troubleshooting, incident management, and RCA skills
Hands-on experience in platform modernization and operational improvements
Preferred
SYSPLEX and ICF configuration/tuning; experience decoupling SYSPLEX is a plus
Middleware interfaces: AIX, WebSphere, Networks, LDAP
Knowledge of network communication protocols (TCP/IP)
IBM z16 hardware infrastructure and Dell/EMC storage subsystems
Pervasive encryption on z/OS and ransomware solutioning
Java/J2EE experience
DB2/UDB experience
Benefits
Health and welfare benefits coverage options including medical, dental, vision, spending accounts, life insurance, voluntary plans
Participation in a 401(k) plan
Company
System One
System One is a professional staffing firms.
5001-10000 employees
H1B Sponsorship
System One has a track record of offering H1B sponsorships. Please note that this does not
guarantee sponsorship for this specific role. Below presents additional info for your
reference. (Data Powered by US Department of Labor)
Distribution of Different Job Fields Receiving Sponsorship
Represents job field similar to this job
Trends of Total Sponsorships
2025 (5)
2024 (6)
2023 (9)
2022 (10)
2021 (9)
2020 (5)
Funding
Current Stage
Late StageTotal Funding
$301.8MKey Investors
TruistOaktree Capital ManagementProspect Capital Corporation
2021-01-28Debt Financing· $290M
2020-12-08Private Equity
2016-09-20Acquired
Leadership Team
Troy Gregory
Chief Executive Officer
Dan Moran
Chief Financial Officer
Recent News
2026-01-06
Company data provided by crunchbase