z/OS UNIX System Services (USS) Security Engineer – Vice President

z/OS UNIX System Services (USS) Security Engineer – Vice President Profile Description We’re seeking someone to join our ETS team as the USS Security Engineer who is responsible for securing and administering z/OS UNIX System Services (USS) environments on the mainframe. This role focuses on enforcing least privilege, protecting privileged access, and ensuring alignment between UNIX permissions, ESM controls (RACF/TSS), and enterprise security standards. The engineer will partner closely with Enterprise Z security architect, system programmers, middleware teams, and audit/compliance stakeholders to maintain a secure and compliant USS platform. About Enterprise Technology & Services (ETS) Enterprise Technology & Services (ETS) delivers shared technology services that support all business applications and over 3,000 production systems globally. ETS enables the full software development lifecycle—from development and testing to release engineering, monitoring, and operational support. In the Technology division, we leverage innovation to build the connections and capabilities that power our Firm, enabling our clients and colleagues to redefine markets and shape the future of our communities. This is a Lead Infra Prod Management & Reliability Engineering position at Vice President Level, which is part of the job family responsible for developing and maintaining software solutions that support business needs. Since 1935, Morgan Stanley is known as a global leader in financial services, always evolving and innovating to better serve our clients and our communities in more than 40 countries around the world. What you’ll do in the role: Responsibilities: * Administer and manage USS identities, including UIDs, GIDs, OMVS segments, and service/shared IDs based on policy. * Enforce naming standards, ownership traceability, and lifecycle controls for USS users and services. * Manage and audit POSIX permissions, ownership, and execution rights across critical USS file systems. * Control and monitor privileged access, including UID(0), setuid/setgid programs, and elevated authorities. * Administer USS‑related ESM controls (RACF/TSS), including UNIXPRIV, FACILITY resources, and STARTED task identities. * Secure USS configuration files, shell environments, PATH settings, and file system mount options. * Monitor USS security events, logs, and audit records. * Support production issues, security incidents, and access‑related investigations. * Develop and maintain USS security standards, procedures, and documentation. What you’ll bring to the role: Required Skills: * Bachelor’s degree and 10+ years of experience with mainframe and z/OS UNIX System Services. * At least 6 years' relevant experience would generally be expected to find the skills required for this role. * Strong hands‑on experience securing USS environments. * Proven experience administering RACF or equivalent ESM for USS. * Solid understanding of: * UIDs, GIDs, OMVS segments, and service IDs * POSIX permissions, ownership, and execution controls * Experience with USS‑related security controls, including: * UNIXPRIV class * FACILITY class resources impacting OMVS * STARTED task identities for USS services * Working knowledge of zFS/HFS file systems, mount options, and USS SMF/audit logging. * Strong understanding of least‑privilege and separation‑of‑duties principles. Desired * Experience with PKI, digital certificates, Kerberos, SSL/TLS, SSH, or OpenSSL. * Exposure to systems programming concepts (e.g., SMP/E, SYS1 datasets, Assembler). * Understanding of mainframe networking concepts. * Experience supporting or securing middleware technologies (e.g., MQ). WHAT YOU CAN EXPECT FROM MORGAN STANLEY: At Morgan Stanley, we raise, manage and allocate capital for our clients – helping them reach their goals. We do it in a way that’s differentiated – and we’ve done that for 90 years. Our values - putting clients first, doing the right thing,...