Mainframe Engineer

DMI is a leading provider of digital services and technology solutions, headquartered in Tysons Corner, VA. With a focus on end-to-end managed IT services, including managed mobility, cloud, cybersecurity, network operations, and application development, DMI supports public sector agencies and commercial enterprises around the globe. Recognized as a Top Workplace, DMI is committed to delivering secure, efcient, and cost-effective solutions that drive measurable results. Learn more at www.dminc.com

DMI, LLC is seeking a highly experienced and driven Mainframe Systems Engineer to play a key leadership role supporting and managing mission-critical IBM z/OS mainframe environments. This role is ideal for a seasoned professional who enjoys solving complex system challenges, influencing platform stability at scale, and working in high-availability, enterprise environments. The ideal candidate brings deep technical expertise, strong collaboration skills, and experience supporting financial services or similarly regulated, high-volume systems.

Duties and Responsibilities:

Technical Support and Maintenance

• Provide senior-level technical leadership and hands-on support for IBM z/OS mainframe systems, including installation, implementation, administration, and ongoing maintenance.

• Lead advanced problem determination and resolution, performing system dump analysis and identifying root causes for outages and performance issues.

System Upgrades and Fixes

• Partner with internal teams and vendors to analyze system dumps, apply fixes and patches, and coordinate testing and deployment of new system versions.

• Drive upgrade initiatives from planning through implementation, ensuring minimal disruption and maximum system stability.

System Software and Infrastructure Management

• Install, maintain, and customize z/OS operating systems and third-party ISV system software.

• Configure, debug, and maintain TCPIP and VTAM subsystem environments.

• Prepare and install system software in alignment with vendor standards and site-specific installation procedures.

Large-Scale System Integrity

• Participate in the installation, implementation, and performance testing of IBM z/OS Parallel Sysplex environments, including shared and cluster queues.

• Manage LPAR environments, ensuring the reliability, scalability, and integrity of large, enterprise-class systems.

Collaboration and Coordination

• Work closely with cross-functional technical teams, business stakeholders, and vendor support to ensure smooth rollouts of new systems and enhancements.

• Clearly communicate technical risks, issues, and solutions to staff, customers, and IT leadership at all levels.

• BA/BS in Computer Science, Engineering, or a related field, or an equivalent combination of education and experience.

• Six or more years of hands-on experience in mainframe systems operations and management, including TCPIP and VTAM configuration and debugging.

• Advanced knowledge of z/OSMF, AT-TLS rules, IPSEC policies, SMP/E, TSO/ISPF, SDSF/ISPF, and LPAR management.

• Strong understanding of enterprise systems integration tools and best practices.

• Exceptional analytical and troubleshooting skills, with the ability to resolve highly complex system issues.

• Strong written and verbal communication skills, capable of translating technical concepts for both technical and non-technical audiences.

• Experience supporting financial services or other highly regulated, high-availability environments.

Additional Requirements: Successful completion of a Public Trust background investigation and/or a Public Trust clearance.

Min Citizenship Status Required: Must be a U.S. Citizen

Physical Requirements: No physical requirement is needed for this position.

Location: Remote, US

#LI-SM3

DMI is a diverse, prosperous, and rewarding place to work. Our culture is shaped by five core values that guide how we work, grow, and succeed together:

• Do What's Right - We lead with honesty and integrity.
• Own the Outcome - We take responsibility and deliver.
• Deliver for Our Customers - We are relentless about delivering value.
• Think Bold, Act Smart - We innovate with purpose.
• Win Together - We collaborate and celebrate our success.

These values aren't just ideals-they show up in how we support every part of your well-being:

• Convenience/Concierge - Virtual health visits, commuter perks, pet insurance, and entertainment discounts that make life easier.
• Development - Annual performance reviews, tuition assistance, and internal career growth opportunities to help you thrive.
• Financial - Generous 401(k) matches, life and disability insurance, and financial wellness tools to support your future.
• Recognition - Annual awards, service anniversaries, referral bonuses, and peer-to-peer shoutouts that spotlight your achievements.
• Wellness - Healthcare coverage, wellness programs, flu shots, and biometric screenings to support your health.

DMI values employees for their talents and contributions, and we take pride in helping our customers achieve their goals. Because when we live our values, we all win together.

***************** No Agencies Please *****************

Applicants selected may be subject to a government security investigation and must meet eligibility requirements for access to classified information. US citizenship may be required for some positions.