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# Senior z/OS Developer

- **Company:** Capgemini
- **Location:** United States
- **Experience:** Expert
- **Salary:** $82,082.0 - $193,440.0
- **Contract:** Permanent contract
- **Skills:** Assembly Language, Batch Processing, Unix, Data Structures, File Transfer, Job Control Language (JCL), Rexx (Programming Language), Network Protocols, Performance Tuning, TCP/IP, Virtual Storage Access Methods, Z/OS, Transport Layer Security
- **Published:** July 18, 2026
- **Apply:** https://www.capgemini.com/jobs/517338-en_US_SAPBTP/x/

## About the Role

We are seeking an experienced Senior z/OS Assembler Programmer to play a key role in the development, enhancement, and Level 3 support of a mature enterprise z/OS product. This position requires deep expertise in Assembler programming, feature design, complex problem analysis, and issue resolution within a mainframe environment.

The ideal candidate will possess strong technical leadership capabilities, be able to mentor and guide team members, and effectively communicate with customers while managing complex technical situations., * Understand complex legacy assembler applications quickly. Analyze, design and code new features.

 * Diagnosing difficult production problems using dumps and traces and code fixes for the problems
 * Lead others in development and L3 work
 * Communicate effectively with customers and manage difficult situations

Your skills and experience

 * Expert in assembler language coding, with at least a decade of experience
 * Strong knowledge of dump analysis

Nice to have

 * Experience working with TCP/IP and SNA networking protocols within z/OS environments.
 * Understanding of Job Control Language (JCL) and its application in batch processing and system operations.
 * Experience with VSAM data structures, file management, and performance tuning.
 * Knowledge of z/OS task management, including Recovery Termination Management (RTM) and I/O support services.
 * Familiarity with SMP/E for software installation, maintenance, and upgrade management.
 * Experience working with UNIX System Services (USS) in z/OS environments.
 * Knowledge of IBM C/C++ development on the mainframe platform.
 * Experience developing and maintaining automation or utility scripts using REXX.
 * Understanding of TLS, System SSL, and zIIP processor technologies to support secure and optimized mainframe workloads.
 * Previous experience supporting or developing Managed File Transfer (MFT) solutions or other core z/OS system products would be highly beneficial.



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