Senior Mainframe Development Engineer

Calling all innovators – find your future at Fiserv.

We’re Fiserv, a global leader in Fintech and payments, and we move money and information in a way that moves the world. We connect financial institutions, corporations, merchants, and consumers to one another millions of times a day – quickly, reliably, and securely. Any time you swipe your credit card, pay through a mobile app, or withdraw money from the bank, we’re involved. If you want to make an impact on a global scale, come make a difference at Fiserv.

Job Title

About your role:

What you'll do:

• 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

Experience you'll need to have:

• 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

Experience that would be great to have:

• 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

How you’ll work:

• This role is allowed to work fully remote

• This role requires flexibility to work overtime or off-hours that includes weekends and holidays

• This role requires use of a computer and audio equipment

Sponsorship:

• In order to be considered, you must be legally authorized to work in the U.S. without need for visa sponsorship now or in the future

This role is not eligible to be performed in Colorado, California, District of Columbia, Hawaii, Illinois, Massachusetts, Maryland, Minnesota, New Jersey, New York, Nevada, Rhode Island or Washington.

It is unlawful to discriminate against a prospective employee due to the individual's status as a veteran.

Please note that salary ranges provided for this role on external job boards are salary estimates made by outside parties and may not be accurate.

Thank you for considering employment with Fiserv.  Please:

• Apply using your legal name
• Complete the step-by-step profile and attach your resume (either is acceptable, both are preferable).

Our commitment to Equal Opportunity:

Fiserv is proud to be an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, national origin, gender, gender identity, sexual orientation, age, disability, protected veteran status, or any other category protected by law. 

If you have a disability and require a reasonable accommodation in completing a job application or otherwise participating in the overall hiring process, please contact AskHR.US@fiserv.com. Please note our AskHR representatives do not have visibility to your application status. Current associates who require a workplace accommodation should refer to Fiserv’s Disability Accommodation Policy for additional information.

Note to agencies:

Fiserv does not accept resume submissions from agencies outside of existing agreements. Please do not send resumes to Fiserv associates. Fiserv is not responsible for any fees associated with unsolicited resume submissions.

Warning about fake job posts:

Please be aware of fraudulent job postings that are not affiliated with Fiserv. Fraudulent job postings may be used by cyber criminals to target your personally identifiable information and/or to steal money or financial information. Any communications from a Fiserv representative will come from a legitimate Fiserv email address.