Senior Mainframe Engineer

Thank you for your interest in joining Keystone AI . Keystone AI is a new healthcare company with a long legacy of solving big challenges that improve lives and help healthcare professionals perform at their best. At Keystone AI , people are at the heart of every innovation we pursue. Guided by empathy, insight, and clinical intelligence, we collaborate with the best minds in healthcare to address our customers’ toughest challenges. While we continue updating the Keystone AI Careers Page and applicant materials, some documents may still reflect legacy branding. Please note that all listed roles are Keystone AI positions, and our Privacy Policy: https://www.solventum.com/en-us/home/legal/website-privacy-statement/applicant-privacy/ applies to any personal information you submit. As it was with 3M, at Keystone AI all qualified applicants will receive consideration for employment without regard to their race, color, religion, sex, sexual orientation, gender identity, national origin, disability, or status as a protected veteran. Job Description: 3M Health Care is now Keystone AI At Keystone AI , we enable better, smarter, safer healthcare to improve lives. As a new company with a long legacy of creating breakthrough solutions for our customers’ toughest challenges, we pioneer game-changing innovations at the intersection of health, material and data science that change patients' lives for the better while enabling healthcare professionals to perform at their best. Because people, and their wellbeing, are at the heart of every scientific advancement we pursue. We partner closely with the brightest minds in healthcare to ensure that every solution we create melds the latest technology with compassion and empathy. Because at Keystone AI , we never stop solving for you. The Impact You’ll Make in this Role As a Senior Mainframe Engineer, you will have the opportunity to collaborate with some of the most innovative and diverse people around the world. Here, you will make an impact by: How you will make an impact Support the installation, configuration, management, and ongoing operation of software components across staging and production mainframe environments, including user support for loading regression files and testing components. Lead and manage relationships with mainframe vendors related to upgrades, maintenance windows, and downtime, while supporting government-related work that requires timely, deliberate, and detail-oriented delivery. Develop, maintain, and support CICS and batch caller applications for software components, including troubleshooting and debugging issues in collaboration with downstream teams and clients. Perform performance testing and tuning of components to optimize processing speed and memory usage in alignment with company and client requirements. Design, program, own, and support Java applications using industry-standard software engineering practices and collaborate with technical writers to create and maintain install manuals and user guides for mainframe-based software components. Your Skills and Expertise To set you up for success in this role from day one, Keystone AI requires (at a minimum) the following qualifications: Bachelor’s Degree or higher (completed and verified prior to start) from an accredited university AND Six (6) years of Experience in software development OR High School Diploma/GED or higher (completed and verified prior to start) and Ten (10) years in the years of experience in software development in lieu of the bachelor’s degree education requirement AND Experience supporting and working within IBM’s mainframe environment Five (5) years of mainframe administration experience Ten (10) years of software engineering experience on the mainframe Additional qualifications that could help you succeed even further in this role include: Master’s degree in Computer Science or related field from an accredited institution, with five (5) years of professional experience in a private, public, government, or military environment Experience maintaining mainframes, including installs, upgrades, patches, configuration, tuning, and mainframe/Unix partitioning Experience with mainframe technologies including COBOL/VSAM, BAL (assembler), OS/JCL, CICS, TSO, MVS, SCLM source control; ability to program, run jobs, and debug COBOL, Java, runtime errors, and complications Working knowledge of Java (OSGI bundle), object-oriented design and design patterns, and proficiency using IDEs such as Eclipse, IntelliJ, or Visual Studio for debugging, code completion, searching, and performance metrics Proficiency with software configuration management and build automation (e.g., Git, Jenkins, Maven, Ant), familiarity with GitHub Copilot or other agentic AI tools, and working knowledge of relational databases (Oracle, Postgres, MySQL, MSSQL) Experience with health information systems; familiarity with healthcare claims processing software and/or clinical classification methodologies preferred; familiarity with Agile