System Engineer

Payments Systems Mainframe Engineer

Location: 100% Remote (Must work EST hours)

Duration: 24-Month Contract (W2)

Overview

We are seeking a highly experienced Senior Mainframe Payments Engineer to join the debit card processing team that supports the existing ATH platform. This role is ideal for a seasoned payments professional with deep expertise in card processing, authorization systems, and transaction routing who can contribute strategically beyond hands-on development.

The successful candidate will play a key role in maintaining and enhancing critical payment processing systems while providing architectural guidance and technical leadership across the platform.

Key Responsibilities

• Support and enhance the legacy ACI Postilion (formerly Base24) environment supporting the ATH platform.
• Design, develop, and maintain payment transaction processing solutions.
• Provide expertise in authorization routing, debit network integrations, and card transaction processing.
• Collaborate with technical and business stakeholders to evaluate and implement system improvements.
• Contribute to architecture discussions and provide recommendations for platform modernization and optimization.
• Troubleshoot and resolve complex production issues related to payment processing systems.
• Ensure compliance with security, encryption, tokenization, and payment industry best practices.
• Support integration efforts across mainframe and distributed platform environments.

Required Qualifications

• Deep knowledge of card processing and electronic payments systems.
• ACI or Base24 platform experience is not required if you have worked with ATM's and know how to integrate the distributed with the mainframe. It flows through from postilion to auth.
• Looking for someone who has experience working for a processor at a bank
• This role requires more than COBOL. We need someone with current CICS and broader mainframe experience who can troubleshoot system, security, and node/connectivity issues with limited direction and ultimately take on senior technical and architecture responsibilities for ATH.

Experience with:

• Processing
• Authorization routing
• Debit networks
• Payment switching and transaction processing
• Payment platform architecture
• Strong understanding of:
• Encryption technologies
• Tokenization
• Payments security concepts
• Hands-on development experience in COBOL mainframe environments with JCL, CICS, DB2
• Must have an architectural mindset and strong troubleshooting abilities, with experience navigating mainframe environments, analyzing COBOL/CICS applications, performing root cause analysis, reverse engineering complex issues, and assessing the downstream impact of system changes.
• Ability to analyze complex systems and provide architectural guidance and recommendations.
• Excellent problem-solving and communication skills

Must be able to work on W2 without sponsorship now or in the future