About UOB United Overseas Bank Limited (UOB) is a leading bank in Asia with a global network of more than 500 branches and offices in 19 countries and territories in Asia Pacific, Europe and North America. In Asia, we operate through our head office in Singapore and banking subsidiaries in China, Indonesia, Malaysia and Thailand, as well as branches and offices. Our history spans more than 80 years. Over this time, we have been guided by our values – Honorable, Enterprising, United and Committed. This means we always strive to do what is right, build for the future, work as one team and pursue long-term success. It is how we work, consistently, be it towards the company, our colleagues or our customers. Job Description Design, develop, deploy, maintain, and enhance infrastructure security capabilities for zOS / RACF / Mainframe platforms. Manage and execute security related change requests related to Mainframe systems. Develop and maintain documentation including Security Standards, Access Control Baselines, and operational processes. Identify and implement automation opportunities for Mainframe & Security Administration. Collaborate with Business and Systems Services teams to align infrastructure and application requirements with GIS-managed security solutions. Provide production support and monitoring to ensure control efficacy and solution reliability. Conduct product research, define requirements, and perform technical Proof of Concept for new security initiatives. Contribute to the development and maintenance of Mainframe security policies, standards, and procedures to ensure regulatory compliance and alignment with industry best practices. Respond to audit and regulatory requests with timely and accurate information. Knowledge in AS400 is favorable although not mandatory. Knowledge in Splunk is favorable although not mandatory.