Mainframe Assembler Developer - Hybrid

MSP•Addison, TX

3d•Hybrid

About The Position

Genesis10 is seeking a Mainframe Assembler Developer for a hybrid role (3 days onsite per week) with a Global Financial Institution. This is a 12+ month contract opportunity. The role involves supporting and enhancing a mission-critical legacy application written in IBM z/OS assembler language. The ideal candidate will be a self-sufficient engineer capable of independently analyzing, maintaining, and improving high-volume, high-availability batch processing systems. This position requires deep expertise in core mainframe technologies and familiarity with parallel sysplex environments within a regulated financial services environment.

Requirements

8+ years of experience in IBM Mainframe application development and production support
Strong hands-on expertise in Assembler (HLASM) programming, JCL development, troubleshooting, GDGs, and batch processing
Proven experience with Connect:Direct (NDM), ISPW (or equivalent), CA7 scheduling, TSO/ISPF, and GitHub CoPilot
Demonstrated experience supporting high-volume financial transaction systems and production batch environments with strict SLAs
Experience working in high-availability environments, including Sysplex architectures and multiple LPARs
Solid understanding of Mainframe datasets, VSAM, utilities, production support processes, and incident management
Experience using ServiceNow and/or Remedy

Nice To Haves

Experience in financial services or banking environments
Prior experience with check processing, image item processing, or payment processing platforms
Experience supporting high-volume, high-throughput transaction systems and mission-critical applications
Familiarity with SMP/E for system maintenance and SAR for reporting
Experience supporting assembler applications during platform upgrades or compatibility changes

Responsibilities

Analyze, maintain, and improve high-volume, high-availability batch processing systems
Work independently to support and enhance mission-critical legacy applications
Analyze complex assembler codebases in loosely documented environments
Diagnose and resolve critical production issues quickly

Benefits

Access to hundreds of clients, most who have been working with Genesis10 for 5-20+ years.
The opportunity to have a career-home in Genesis10; many of our consultants have been working exclusively with Genesis10 for years.
Access to an experienced, caring recruiting team (more than 7 years of experience, on average.)
Behavioral Health Platform
Medical, Dental, Vision
Health Savings Account
Voluntary Hospital Indemnity (Critical Illness & Accident)
Voluntary Term Life Insurance
401K
Sick Pay (for applicable states/municipalities)
Commuter Benefits (Dallas, NYC, SF, and Illinois)