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# Senior Mainframe Assembler Developer - Charlotte, NC/ Addison, TX

- **Company:** Experis
- **Location:** Addison, TX, United States
- **Experience:** Expert
- **Contract:** Temporary to permanent
- **Skills:** Payment Systems, Job Control Language (JCL), IBM Mainframe, Mainframes, Software Engineering, Virtual Storage Access Methods, Tso/ispf
- **Published:** August 3, 2026
- **Apply:** https://www.indeed.com/viewjob?jk=365ce0aa964a58f9

## About the Role

Our client, a leader in financial services, is seeking an Sr. Mainframe Assembler Developer to join their team. As a Senior Mainframe Assembler Developer, you will be part of the Mainframe Support team supporting mission-critical legacy applications. The ideal candidate will have strong analytical skills, independence, and a proactive approach, which will align successfully in the organization., * 8+ years of experience in IBM Mainframe application development and production support.

 * Deep expertise in Assembler (HLASM) programming, JCL development, and troubleshooting.
 * Hands-on experience with Connect:Direct (NDM), ISPW, CA7 scheduling, and TSO/ISPF environment.
 * Proven ability to support high-volume financial transaction systems in high-availability environments.
 * Strong understanding of mainframe datasets, VSAM, and utilities, along with incident management processes.

## Description

* Support and enhance high-volume, high-availability mainframe applications written in IBM z/OS assembler language.
 * Analyze complex assembler codebases to diagnose and resolve critical production issues efficiently.
 * Maintain and troubleshoot JCL, GDGs, and batch processing environments to ensure smooth operations.
 * Collaborate with cross-functional teams to support system upgrades, platform changes, and process improvements.
 * Support check/image item processing and payment platforms within a regulated financial environment.


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