Ass. Software Engineer
Opalina Tech.
• Developed and maintained ”SPID”, and it’s Sub-System This we developed for Banamex and Citi Bank, Mexico. future‑proof technical architecture. • Conducted thorough testing of application features in internal and client environments, ensuring optimal performance and reliability. • Implemented multi‑threaded worker service on IBM-WAS for large file packaging, leveraging parallelism, concurrency, and cloud‑native work‑ flows to improve processing efficiency. • Collaborated with Banamex/Citi Banks teams to design and implement customized software solutions for them. • Fixed critical bugs and optimized code (including stored procedures), improving performance and resolving production issues. • Integrated PL/SQL oracle DB enabling efficient handling of complex calculations and large datasets. Projects A Core Java, Spring Boot, Spring MVC, REST API, Microservices, Oracle (PL/SQL), Hibernate/JPA, Git, Jenkins, JBoss, Tomcat, Swagger,CICD,Version Control, Agile TDD,blackduck,sonarqube,frog,LLM,vectorDB, springAI. Designed, developed, and optimized backend applications across multiple banking and financial domain projects (MUFG & Citibank). Built REST APIs and microservices for Customer Management Systems used by multiple organizations interacting with MUFG Bank. Migrated critical components from SQL Server to Oracle databases, including schemas, tables, stored procedures, and applicati on-level integrations. Designed robust database schemas, optimized PL/SQL procedures, and improved backend performance for high -volume financial transaction systems. Developed data migration modules and SIT support tools to extract and transform banking data as per business requirements. Implemented auditing, reconciliation, and receipt-generation systems for daily financial transactions across multiple Citibank sub-systems (ANR, CRS, BDS, Factoraje). Improved code quality through SonarQube fixes, implemented JUnit test cases, and contributed to continuous integration and de ployment pipelines using Jenkins. Collaborated with multi-location teams for requirement analysis, integration, testing, and production deployments. Worked on optimizing end-to-end workflows, including file generation, confirmation systems, and decision services involving BOM (Bank of Mexico) and other financial entities. Created RESTful APIs for microservices in a grocery shopping web app. • Implemented login with Spring Web Security and JWT (JSON Web Token) for session management in MUFG . • Applied search predicates for database queries and optimized with multi‑threading and ThreadLocal/Threadpool. Handled support-cum-development activities for all projects, including production issue analysis RCA expertise, L2/L3 troubleshooting, UAT support, and environment health monitoring. Performed patching and deployments across IBM WebSphere (WAS), Oracle DB, and IBM MQ servers, ensuring stability, performance, and continuous business availability
