Senior Software Engineer – Mainframe

Senior-level mainframe engineer responsible for delivering secure, resilient, and maintainable enterprise application solutions across delivery, modernization, and production support. This role partners across business, technology, QA, architecture, and operations to deliver quality outcomes aligned to enterprise SDLC, risk, regulatory, and technology standards. 

Primary Responsibilities 

1. Mainframe Software Engineering & Delivery 

• Own delivery of secure, resilient, performance-aware mainframe solutions across the full lifecycle from analysis and design through implementation, validation, and production support. 

• Translate business and technical requirements into quality application changes that support reliable batch, online, interface, and data-processing capabilities. 

• Troubleshoot application, transaction, batch, interface, data flow, restart/recovery, and downstream impact issues. 

• Prepare technical specifications, implementation and backout plans, support documentation, and delivery estimates with clear ownership of risks, dependencies, quality, and production stability. 

2. SDLC, Quality & Release Readiness 

• Execute SDLC activities across requirements analysis, estimation, design, coding, testing, documentation, change control, and release readiness. 

• Apply GitLab and DevOps practices for source control, branching, merge requests, peer review, traceability, CI/CD, deployment planning, and implementation validation. 

• Prepare and execute unit, integration, regression, batch validation, data reconciliation, UAT support, production verification, and defect resolution activities. 

• Improve reliability and delivery quality through peer review, code quality, test coverage, automation, release evidence, and post-production validation. 

3. Modernization, Integration & Stability 

• Support modernization initiatives including API enablement, data integration, technical debt reduction, platform resiliency, and modern IBM z development practices. 

• Contribute to integration designs across mainframe, distributed platforms, cloud-connected applications, MQ, APIs, and data movement patterns. 

• Support production applications, batch schedules, online transactions, interfaces, operational workflows, incident resolution, root cause analysis, and problem management. 

• Improve application stability, performance, restartability, supportability, operational efficiency, and recovery readiness. 

4. Collaboration & Technical Leadership 

• Partner with business, product, architecture, QA, operations, and engineering teams to deliver reliable solutions. 

• Guide less experienced engineers on application functionality, coding, debugging, testing, release procedures, and SDLC adherence. 

• Maintain strong knowledge of supported applications, business processes, dependencies, operational