Senior Mainframe Development Engineer

Fiserv • Berkeley Heights, NJ

1d • Remote

About The Position

This role is critical to advancing the transformation of our core processing environment. You will play a key role in modernizing legacy mainframe systems with the primary focus on DevOps and AI-based modernization initiatives. You will bridge deep legacy expertise with modern engineering practices, helping reduce technical debt, improve resiliency, and ensure the long‑term maintainability of our platforms as industry skill sets continue to evolve.

Requirements

• 8+ years of mainframe transactional, batch, and core processing systems.
• Demonstrated success modernizing, refactoring, or translating legacy codebases into modern architectures or languages
• 5+ years of experience with modern software development practices, including version control, structured testing, and CI/CD pipelines
• 5+ years of experience with modern languages (e.g., Java, Python), API‑based architectures, cloud or hybrid environments, and enterprise integration patterns
• Bachelor's degree in computer science, information technology, or a related field, and/or equivalent military experience
• Must be legally authorized to work in the U.S. without need for visa sponsorship now or in the future

Nice To Haves

• Experience collaborating across architecture, platform, DevOps, and application teams in large enterprise environments
• Ability to analyze complex systems with limited documentation and clearly articulate legacy logic to modern engineering teams
• Experience in the financial services industry

Responsibilities

• Drive modernization of legacy mainframe applications (Assembler and COBOL) with a strong focus on developer experience (DX), automation, and DevOps adoption
• Design and implement CI/CD pipelines for mainframe workloads, integrating legacy systems into modern DevOps and platform engineering practices
• Enable AI‑assisted development and modernization, including the use of AI for code analysis, refactoring, documentation, test generation, and modernization acceleration
• Partner with platform, DevOps, and SRE teams to embed observability, reliability, and security into modernized mainframe applications
• Capture and codify legacy system knowledge to enable AI‑driven insights and ensure knowledge is accessible to the next generation of engineers
• Serve as a technical leader and advocate for modern engineering practices on the mainframe, mentoring teams and helping shift culture toward automation‑first and continuous delivery models

What This Job Offers

• Job Type: Full-time
• Career Level: Senior
• Number of Employees: 5,001-10,000 employees