Senior Mainframe Assembler Engineer — Hybrid

Experis; Addison (TX); Hybrid; USD 120,000 - 170,000; Full time

Benefits offered by this job

Medical Plan

Dental Plan

Vision Plan

401(k) with match

Weekly Pay

Job summary

Experis, a ManpowerGroup brand, is seeking a Sr. Mainframe Assembler Developer/Engineer to join our client’s Mainframe Support team. This hybrid position is based in Addison, TX or Charlotte, NC, and requires onsite presence three days a week.

You will support mission-critical IBM z/OS assembler applications, analyze complex code, maintain JCL and batch processes, and collaborate across teams to drive system upgrades and reliable batch processing in a regulated financial environment.

Qualifications

• 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.

Responsibilities

• 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.

Skills

HLASM

JCL

NDM/Connect:Direct

CA7 Scheduling

TSO/ISPF

VSAM

Production support

Tools

ISPW

Connect:Direct

Job description

Experis, a ManpowerGroup brand, is seeking a Sr. Mainframe Assembler Developer/Engineer to join our client’s Mainframe Support team. This hybrid position is based in Addison, TX or Charlotte, NC, and requires onsite presence three days a week.

You will support mission-critical IBM z/OS assembler applications, analyze complex code, maintain JCL and batch processes, and collaborate across teams to drive system upgrades and reliable batch processing in a regulated financial environment.