Senior AS400 Developer (Banking Applications)

Employment type: Full-time About the role: We are looking for a Senior AS400 Developer to design, enhance, and support mission-critical banking applications. You will work across core banking, trade finance, credit card, and loan platforms, owning the full software development lifecycle from requirement analysis to production support. The role suits an experienced engineer who can also lead a small team, manage stakeholders, and deliver reliable changes in a regulated banking environment. Key responsibilities • Develop and enhance AS400 applications in RPGLE, ILE RPG, CLLE, SQL, and Query400 to meet business requirements • Analyse change requests, prepare functional and technical specifications, and write unit test cases • Support SIT, UAT, and production deployments, including post-implementation support for released enhancements • Manage batch jobs and file transfers using Control-M, Connect:Direct, and sFTP / GoAnywhere • Maintain source code and change control using MKS, Aldon, and ARCAD • Coordinate with business users and cross-functional teams to clarify requirements and resolve production issues • Lead and mentor junior developers, reviewing their work and guiding delivery on small projects • Handle production ticket analysis, root-cause investigation, bug fixes, and technical deliveries in a delivery model covering production support, enhancements, and development Requirements • Bachelor's degree in Engineering (Electronics, Computer Science, or equivalent) or a related discipline • Atleast 12 years of hands-on experience with AS400 / IBM i technology, including RPGLE, CLLE, DB2, SQL, COBOL, and Query400 • Strong exposure to banking systems, ideally core banking, trade finance, credit card, or loan applications • Experience across the SDLC, including requirements analysis, design, development, testing, deployment, and production support • Working knowledge of file transfer and job scheduling tools such as Connect:Direct, sFTP, Control-M, or GoAnywhere • Experience with change management tools such as MKS, Aldon, or ARCAD • Prior experience working in Singapore or APAC banking environments is an advantage • Proven ability to learn new technologies quickly, manage stakeholders, and work as a proactive team player • Strong written and verbal communication skills What we offer • Opportunity to work on enterprise banking platforms across the APAC region • Exposure to end-to-end delivery from design through production support • A collaborative team environment with room to grow into technical leadership