Senior Software Engineer – Payments Platform & Modernization

ACI Worldwide; Omaha (NE); On-site; USD 120,000 - 160,000; Full time

Job summary

ACI Worldwide in Norcross, GA is seeking a Sr. Software Engineer to help power the payments ecosystem. You will design, develop, and maintain mission-critical enterprise applications.

The role emphasizes Java expertise, large-scale transaction processing, production support, modernization initiatives, and collaboration with cross-functional teams. This is a hands-on, mentor-led position in a fast-paced, innovative environment.

Qualifications

• 8+ 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

Large-scale txn platforms

Production debugging

Software architecture & APIs

Secure SDLC

Communication & collaboration

Job description

ACI Worldwide in Norcross, GA is seeking a Sr. Software Engineer to help power the payments ecosystem. You will design, develop, and maintain mission-critical enterprise applications.

The role emphasizes Java expertise, large-scale transaction processing, production support, modernization initiatives, and collaboration with cross-functional teams. This is a hands-on, mentor-led position in a fast-paced, innovative environment.