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# Sr. Mainframe Developer

- **Company:** Capgemini
- **Location:** Nashville, TN, United States
- **Experience:** Expert
- **Salary:** $124,363.0 - $194,334.0
- **Contract:** Temporary contract
- **Skills:** Application Programming Interfaces (APIs), Customer Information Control System (CICS), COBOL (Programming Language), Data Systems, IBM DB2, DevOps, Job Control Language (JCL), Mainframes, Performance Tuning, Software Engineering, Virtual Storage Access Methods, Z/OS, Cloud Platform System, System Availability, Git, Microservices
- **Published:** May 15, 2026
- **Apply:** https://www.indeed.com/viewjob?jk=13b70c6d58458302

## About the Role

Do you have experience in Systems & applications support?, We are seeking a Senior Mainframe Developer with strong experience in MACSS and IBM z/OS environments to support a mission-critical platform that is currently single-threaded across project delivery, operations, and platform modernization work., * 7+ years of mainframe development experience

 * Strong hands-on experience with MACSS (or closely related mainframe transaction/data systems)
 * Expertise in COBOL, JCL, CICS, DB2, VSAM
 * Experience supporting both application development and production operations
 * Familiarity with IBM z/OS Connect (services, APIs, REST enablement)
 * Experience working in high-availability, regulated, or mission-critical environments
 * Strong problem-solving skills and ability to work independently in a single-threaded or high-ownership model

Preferred / Nice-to-Have Skills

 * Direct experience building or scaling z/OS Connect EE services
 * Exposure to mainframe modernization initiatives (API enablement, service wrappers, DevOps for zOS)
 * Experience integrating mainframe services with distributed or cloud platforms
 * Knowledge of Git, CI/CD pipelines, or DevOps practices for zOS
 * Experience in financial services, insurance, or large enterprise platforms

## Description

This role is being added to free up existing FTE capacity and accelerate delivery for the Giga z/OS Connect platform and service build, ensuring stability, scalability, and modernization of core mainframe services., * Design, develop, and support MACSS-based and mainframe applications in a complex enterprise environment

 * Support project work, production operations, and platform enhancements, reducing reliance on a single SME
 * Contribute to the build and expansion of IBM z/OS Connect services, enabling API and microservices integration with distributed platforms
 * Partner with platform, infrastructure, and application teams to modernize and expose mainframe services
 * Troubleshoot and resolve complex production issues across batch and online processing
 * Participate in platform reliability, performance tuning, and operational readiness
 * Document systems, processes, and service integrations to reduce operational risk
 * Provide mentoring or informal leadership to junior engineers as needed


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