Senior Software Engineer – Payments Platform Modernization

ACI Worldwide, Inc.; Norcross (GA); On-site; USD 120,000 - 160,000; Full time

Job summary

ACI Worldwide, Inc. in Norcross, GA, is seeking a Sr. Software Engineer to join the MTS Development team, focusing on core payment processing capabilities and modernization efforts.

You will work on high-value payments platforms, support regulatory mandates, and drive platform resiliency across enterprise systems. The ideal candidate has 5+ years in software development, strong Java, and experience with large-scale transaction processing.

Qualifications

• 5+ years of software development experience.
• Strong Java and enterprise application development experience.
• Experience with large-scale transaction processing platforms.
• Experience debugging complex production issues.
• Strong understanding of software architecture, integration patterns, APIs, and databases.
• Experience with secure software development practices.
• Excellent communication and collaboration skills.

Responsibilities

• Design, develop, and maintain core MTS platform capabilities.
• Deliver customer and regulatory commitments including payment network mandates.
• Participate in production issue resolution and root cause analysis.
• Support modernization initiatives including 64-bit migration, ISO 20022, structured address, security, and platform enhancements.
• Collaborate with Product Management, Professional Services, Quality Engineering, and Customer Support teams.
• Act as a technical mentor and support knowledge transfer initiatives.
• Drive engineering excellence through automation, testing, observability, and quality improvements.
• Leverage AI-assisted engineering tools to improve productivity and code quality.

Skills

Java

Enterprise apps

Transaction processing

Debugging production issues

Software architecture

APIs

Database technologies

Secure development

Communication

Job description

ACI Worldwide, Inc. in Norcross, GA, is seeking a Sr. Software Engineer to join the MTS Development team, focusing on core payment processing capabilities and modernization efforts.

You will work on high-value payments platforms, support regulatory mandates, and drive platform resiliency across enterprise systems. The ideal candidate has 5+ years in software development, strong Java, and experience with large-scale transaction processing.