Mainframe Assembler Developer

Location: Addison, TX / Charlotte, NC (Hybrid)
Duration: 12 months

About the role

We are seeking a highly experienced Mainframe Assembler Developer to support and enhance a mission-critical legacy application written in IBM z/OS assembler language. This role requires a self-sufficient engineer capable of independently analyzing, maintaining, and improving high-volume, high-availability batch processing systems in a regulated financial services environment. The ideal candidate brings deep expertise across core mainframe technologies and strong familiarity with parallel sysplex environments.

Responsibilities

• Analyze, maintain, and improve high-volume, high-availability batch processing systems.
• Provide production support for IBM Mainframe applications.
• Develop and troubleshoot JCL.
• Manage GDGs and batch processing to meet strict SLAs.
• Work independently within loosely documented legacy environments.
• Analyze complex assembler codebases to diagnose and resolve critical production issues.
• Handle incident management using tools like ServiceNow or Remedy.

Requirements

• 8+ years of experience in IBM Mainframe application development and production support.
• Assembler (HLASM) programming.
• JCL/ECL development and troubleshooting.
• TSO / ISPF environment.
• Connect:Direct (NDM).
• ISPW (or equivalent change management tools).
• CA7 scheduling.
• GitHub CoPilot.
• Mainframe datasets, VSAM, and utilities.

Qualifications

• 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.
• Understanding of production support processes and incident management.
• Experience in financial services or banking environments (preferred).
• Prior experience with check processing, image item processing, or payment processing platforms (preferred).
• Familiarity with SMP/E for system maintenance and upgrades (preferred).
• Familiarity with SAR (System Activity Reporter / reporting tools) (preferred).
• Experience supporting assembler applications during platform upgrades or macro changes (preferred).

Benefits

• Medical, dental, vision, life, and disability insurance plans.
• Employee Stock Purchase Program (ESPP).
• 401K program with company match after 12 months of tenure.
• Health Savings Account (HSA) on the HDHP plan.
• SupportLinc Employee Assistance Program (EAP) with up to 8 free counseling sessions.
• Corporate discount savings program and other discounts.
• On-demand training program and access to certification prep, technical and leadership courses/books/seminars after 6+ months of tenure.
• Certification discounts and association perks (e.g., CompTIA, IIBA).
• Dedicated customer service team for benefits and resources.
• Access to a certified Career Coach.