Payments Systems Mainframe Engineer

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Location: 100% Remote (Must work EST hours)

Duration: 24-Month Contract

Overview

We are seeking a highly experienced Senior Base24 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.

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

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