Senior Software Engineer - Payments Platform Modernization

19109 SPEEDPAY RD; Norcross (GA); On-site; USD 120,000 - 160,000; Full time

Job summary

ACI Worldwide in Norcross, GA is seeking a Senior Software Engineer to join the MTS Development team responsible for one of the industry's most critical high-value payments platforms.

You will design, develop, and maintain core MTS platform capabilities, deliver on customer and regulatory commitments, participate in production issue resolution, and support modernization initiatives including 64-bit migration, ISO 20022, security improvements, and platform enhancements.

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 enhancement programs.
• 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

Production support

Large-scale transactions

APIs

Databases

Security best practices

Communication

Job description

ACI Worldwide in Norcross, GA is seeking a Senior Software Engineer to join the MTS Development team responsible for one of the industry's most critical high-value payments platforms.

You will design, develop, and maintain core MTS platform capabilities, deliver on customer and regulatory commitments, participate in production issue resolution, and support modernization initiatives including 64-bit migration, ISO 20022, security improvements, and platform enhancements.