Mainframe Developer

Job Title: Mainframe Developer - Assembler

Location: Charlotte, NC; Addison, TX (Hybrid)

Mode of work: Hybrid (minimum of 3 days onsite and 2 days remote per week).

Contract: 12-18 months – with possible extension up to 24 months

Interview schedule: 2 rounds,

• Video Is required- TX teams
• Charlotte in person

Position Summary:

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, experience supporting check/image item processing or payment platforms, and strong familiarity with parallel sysplex environments (LPAR-based architectures).

• Primary Skill: Assembler
• Secondary Skill: TSO/ISPF
• Tertiary Skill: JCL/ECL

Required Qualifications

• 8 years of experience in IBM Mainframe application development and production support

Strong hands-on expertise in:

• Assembler (HLASM) programming
• JCL development and troubleshooting
• GDGs and batch processing
• Proven experience with:
• Connect:Direct (NDM)
• ISPW (or equivalent change management tools)
• CA7 scheduling
• TSO / ISPF environment
• GitHub CoPilot

Demonstrated experience supporting:

• High-volume financial transaction systems
• Production batch environments with strict SLAs and recovery requirements
• Experience working in high-availability environments, including:
• Sysplex architectures
• Multiple LPARs and workload distribution

Solid understanding of:

• Mainframe datasets, VSAM, and utilities
• Production support processes and incident management
• Experience using ServiceNow and/or Remedy

Proven ability to:

• Work independently in loosely documented legacy environments
• Analyze complex assembler codebases
• Diagnose and resolve critical production issues quickly

Desired Qualifications:

• Experience in financial services or banking environments

Prior experience with:

• Check processing, image item processing, or payment processing platforms
• Demonstrated experience supporting:
• High-volume, high-throughput transaction systems
• Mission-critical applications requiring near-continuous availability

Familiarity with:

• SMP/E for system maintenance and upgrades
• SAR (System Activity Reporter / reporting tools)

Experience supporting assembler applications during:

• Platform upgrades
• Macro or compatibility changes