Sr MACSS​/Mainframe Developer

Columbus, OH, United States (On‑site)

Contract (7 months 24 days)

Published 1 month ago

data integration

Programming & Tools

performance tuning

cobol

JCL scripting

Modernization support

production support

The Senior Mainframe Developer will support a critical legacy platform (MACSS) within a large-scale modernization initiative.

This role is key to stabilizing and enhancing the core mainframe applications while enabling integration with modern API and event‑driven platforms.

You will play a pivotal role in supporting production systems, delivering enhancements, and ensuring seamless integration with z/OS Connect‑based services as part of a broader digital transformation program.

• Own and support a core mainframe application (MACSS) across production, enhancements, and project initiatives
• Develop and maintain applications using COBOL, JCL, DB2, and CICS
• Troubleshoot and resolve production issues across batch and online systems
• Collaborate with API and platform teams to enable integration via z/OS Connect services
• Support data flows and service exposure to downstream platforms (APIM, Kafka, etc.)
• Participate in system design discussions to support modernization and integration efforts
• Ensure performance, reliability, and scalability of legacy systems

This position is critical in enabling the organization’s transition to a modern, API‑driven architecture by ensuring the stability and scalability of its core legacy systems.

8+ years of hands‑on mainframe development experience.

Strong expertise in:

• COBOL
• JCL
• DB2
• CICS

Proven experience supporting production systems and critical applications.

Experience working in large enterprise environments (preferably utilities, banking, or insurance).

Strong debugging and problem‑solving skills in complex legacy environments.

• Utilities industry experience.
• Experience with IBM z/OS Connect.
• Exposure to API enablement of mainframe systems.
• Familiarity with event‑driven architectures (Kafka or similar).
• Experience supporting systems undergoing modernization or digital transformation.

The pay range that the employer in good faith reasonably expects to pay for this position is $43.92/hour - $68.62/hour. Our benefits include medical, dental, vision and retirement benefits.

Tundra Technical Solutions is among North America’s leading providers of Staffing and Consulting Services. Our success and our clients’ success are built on a foundation of service excellence.

We are an equal opportunity employer, and we do not discriminate on the basis of race, religion, color, national origin, sex, sexual orientation, age, veteran status, disability, genetic information, or other applicable legally protected characteristic. Qualified applicants with arrest or conviction records will be considered for employment in accordance with applicable law, including the Los Angeles County Fair Chance Ordinance for Employers and the California Fair Chance Act.

Unincorporated LA County workers: we reasonably believe that criminal history may have a direct, adverse and negative relationship with the following job duties, potentially resulting in the withdrawal of a conditional offer of employment: client provided property, including hardware (both of which may include data) entrusted to you from theft, loss or damage; return all portable client computer hardware in your possession (including the data contained therein) upon completion of the assignment, and;

maintain the confidentiality of client proprietary, confidential, or non‑public information. In addition, job duties require access to secure and protected client information technology systems and related data security obligations.