What success looks like in this role: The Principal Mainframe Architect is a senior technical leadership role responsible for defining the strategic direction, architecture standards, and long-term roadmap of the enterprise mainframe ecosystem. This role blends deep mainframe expertise with enterprise architecture thinking to modernize mission-critical platforms while ensuring high levels of reliability, performance, security, and compliance. The role acts as a trusted advisor to senior leadership and plays a key role in large-scale transformation initiatives. Principal

Responsibilities

Own and drive the enterprise mainframe architecture vision, strategy, and roadmap aligned with business goals Lead and govern large-scale application modernization initiatives including re-hosting, re-platforming, refactoring, and re-architecting. Act as the highest-level technical authority for IBM z/OS and mainframe-centered solutions Lead and govern mainframe modernization and transformation initiatives, including hybrid cloud integration, API enablement, and DevOps adoption Define and enforce architecture standards, reference architectures, and best practices across mainframe platforms Provide architectural oversight for capacity planning, performance, scalability, resilience, and cost optimization Partner with CIO/CTO, Enterprise Architecture, and senior stakeholders to influence technology and investment decisions Ensure architecture compliance with security, regulatory, audit, and risk management requirements Evaluate and recommend tools, platforms, and vendor solutions to improve efficiency and innovation Serve as an escalation authority for critical production and systemic issues, ensuring long-term architectural fixes Provide technical leadership, design reviews, and risk mitigation guidance across delivery programs. Mentor architects and senior engineers, setting standards for engineering excellence and technical governance Critical Skills Technical Skills Expert-level knowledge of IBM Mainframe architecture including z Systems, z/OS, Sysplex, and GDPS Extensive experience with CICS, IMS, DB2, MQ, VSAM, and high-volume transaction systems Strong background in mainframe application architecture (COBOL, PL/I, Assembler, JCL) Strong knowledge of legacy mainframe stack (Fujitsu GS21) Proven expertise in performance engineering, workload management (WLM), and capacity planning Deep understanding of mainframe security (RACF / ACF2 / Top Secret) and compliance frameworks

Experience

integrating mainframe workloads with distributed systems, APIs, and cloud platforms (Mainframe → AWS / Azure / GCP) Exposure to DevOps, CI/CD, and automation in mainframe environments Strong knowledge of DR, BC planning, high availability, and data resiliency architectures Leadership & Soft Skills Strong architectural and strategic thinking capability Excellent communication skills, including executive-level stakeholder engagement Ability to influence and lead across large, globally distributed teams Customer-focused approach aligned with Unisys delivery and transformation objectives. Candidate Profile 15+ years of IT experience with 10+ years in large-scale mainframe environments Previous experience as a Mainframe Architect, Enterprise Architect, or Principal Engineer Proven track record leading enterprise-scale modernization or transformation programs

Experience

working in regulated industries (banking, insurance, government, healthcare preferred) Comfortable operating at both strategic and hands-on architectural levels IBM certifications (z/OS, z Systems Architecture, DB2, CICS) preferred. #LI-SN1 You will be successful in this role if you have: Master’s degree preferred and 15+ years’ relevant experience OR equivalent combination of education and experience. Unisys is proud to be an equal opportunity employer that considers all qualified applicants without regard to age, blood type, caste, citizenship, color, disability, family medical history, family status, ethnicity, gender, gender expression, gender identity, genetic information, marital status, national origin, parental status, pregnancy, race, religion, sex, sexual orientation, transgender status, veteran status or any other category protected by law. Local employment practices and rights may vary by jurisdiction and are subject to applicable local laws. This commitment includes our efforts to provide for all those who seek to express interest in employment the opportunity to participate without barriers. If you are a US job seeker unable to review the job opportunities herein, or cannot otherwise complete your expression of interest, without additional assistance and would like to discuss a request for reasonable accommodation, please contact our Global Recruiting organization at GlobalRecruiting@unisys.com. US job seekers can find more information about Unisys’ EEO commitment here. Unisys is a global technology solutions company that powers breakthroughs for the world’s leading organizations. Our solutions – cloud, AI, digital workplace, logistics and enterprise computing – help our clients challenge the status quo and unlock their full potential. To learn how we have been helping clients push what’s possible for more than 150 years, visit unisys.com and follow us on LinkedIn. https://www.unisys.com/unisys-legal/recruiting Notice for U.S. Applicants: Unisys is an Equal Opportunity Employer – Minorities/ Females/ Veterans/ Individuals with Disabilities/ Sexual Orientation/ Gender Identity