Software Development Engineering - Sr Professional II

Milwaukee, Wisconsin💼 Full-time🗓 2026-09-22 → 2026-09-25

Core

Develop and maintain legacy banking applications on IBM Z/OS mainframes, handling the full software development lifecycle from analysis to deployment.

Role type

Senior Software Engineer (Mainframe)

Builds

Core financial transaction systems for banks and payment processors

Domain

Fintech / Payments / Mainframe Systems

Deliverable

production ML models | product features | infrastructure

Required skills

IBM Z/OS mainframe development, COBOL, VSAM, CICS, TCPIP, DB2, JCL, Batch processing, software development lifecycle management, Jira

Preferred skills

None stated

Technologies

IBM Z/OS, COBOL, VSAM, CICS, TCPIP, DB2, JCL, Batch, Jira

Responsibilities

Define application architecture and system process flows, perform coding changes to deliver functionality, create and execute test plans, conduct long-term application improvements, perform on-call production support, analyze new requirements and provide estimates

Seniority

Senior, hands-on IC

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About Fiserv

Fiserv is looking for an experienced Product Manager Advisor II – Open Banking, whose primary responsibility will be executing on the go-to-market of digital integrations with an Open API platform, API/APP marketplace and developer portal ecosystems to co-innovate with Fintechs, Financial institutions, prospects and key internal stakeholders to create value for our clients. This role is a hybrid between digital integrations platforms, marketplace technology, open APIs, Agentic AI and product. You will be part of a team working at the intersection of traditional finance and the disruptive world