At Fiserv, I owned three banking microservices end to end, from requirements and design through deployment and production support. I maintained 99.5%+ uptime on critical services and documented APIs with OpenAPI/Swagger.
I built Spring Batch ETL pipelines that processed more than 1 million banking records nightly for NPA reporting and reconciliation. By tuning Hibernate queries and improving data models, I increased transaction throughput by 15% and cut average query execution time by about 30%.
I also led a zero-downtime migration from RichFaces to PrimeFaces, resolving critical security vulnerabilities while keeping services available. Iām experienced in Java, Spring, AWS, and banking systems, and have maintained 85%+ unit test coverage with JUnit and Mockito.
