Kevin Lemus

Application Analyst (Java) at Fiserv

Supported and enhanced enterprise-scale financial applications used by over 200,000 daily users, ensuring reliability and scalability. Designed and managed an authorization microservice to improve secure login and registration processes, reducing onboarding failures. Migrated legacy Struts and SOAP modules into modern Spring Boot REST microservices, enhancing maintainability and system performance. Automated CI/CD deployments integrated with vulnerability scanning tools to accelerate delivery. Developed unit and integration tests with JUnit, Mockito, and Postman to reduce production incidents. Optimized application servers and XML configurations for faster response times. Collaborated with QA and product teams in Agile/Scrum to deliver priority features. Implemented proactive monitoring with Splunk to reduce downtime and improve system stability.

Software Developer at Cerebro Capital

Developed RESTful APIs using Spring Boot for portfolio and covenant tracking modules, increasing system usability and integration. Designed Hibernate/JPA entity and repository layers with advanced pagination and sorting to enable efficient data access. Authored optimized SQL queries in MySQL and PostgreSQL to reduce latency through indexing and tuning. Implemented centralized exception handling and bean validation for consistent error management. Integrated Spring Security with JWT-based authentication to strengthen access control. Maintained API documentation with Swagger/OpenAPI and shared Postman collections to streamline QA. Conducted unit and integration testing using JUnit and Mockito to improve reliability. Supported Docker containerization and assisted with AWS EC2 deployments for UAT, speeding delivery cycles.

Application Analyst (Java) at Fiserv

Supported and enhanced enterprise-scale financial applications serving 200K+ daily users, ensuring high reliability and scalability for financial platforms. Designed and managed an authorization microservice enabling secure login, registration, and authentication, reducing onboarding failures. Migrated Struts and SOAP modules into Spring Boot REST microservices, improving maintainability and reducing system latency. Automated deployments through GitLab CI/CD pipelines integrated with vulnerability scans (Fortify, SCA, WebInspect), accelerating delivery. Enhanced quality assurance by developing unit and integration tests with JUnit, Mockito, and Postman, reducing production incidents. Optimized application servers (Tomcat, Jetty, WildFly) and XML configurations, improving response times and deployment processes. Partnered with QA and Product Owners in Agile/Scrum to deliver high-priority features aligned with business needs. Implemented proactive monitoring and issue resolution using Sp

Software Developer at Cerebro Capital

Developed RESTful APIs with Spring Boot for portfolio and covenant tracking modules, improving system usability and integration. Designed Hibernate/JPA entities and repository layers with pagination and sorting features, enabling faster and structured data access. Authored and optimized SQL queries across MySQL and PostgreSQL, reducing query latency through indexing and tuning. Implemented bean validation and centralized exception handling, ensuring consistent error responses across all services. Integrated Spring Security with JWT-based authentication, strengthening role-based access controls for sensitive operations. Created and maintained API documentation using Swagger/OpenAPI, and shared Postman collections to streamline QA workflows. Conducted unit and integration testing with JUnit and Mockito, increasing coverage and improving application reliability. Supported Docker-based containerization and assisted with AWS EC2 deployments for UAT, expediting delivery schedules.

Application Analyst (Java) at Fiserv

Supported and enhanced enterprise-scale financial applications serving 200K+ daily users, ensuring high reliability and scalability. Designed and managed an authorization microservice enabling secure login, registration, and authentication, reducing onboarding failures. Migrated Struts and SOAP modules into Spring Boot REST microservices, improving maintainability and reducing system latency. Automated deployments through GitLab CI/CD pipelines integrated with vulnerability scans (Fortify, SCA, WebInspect), accelerating delivery. Enhanced quality assurance by developing unit and integration tests with JUnit, Mockito, and Postman, reducing production incidents. Optimized application servers (Tomcat, Jetty, WildFly) and XML configurations, improving response times and deployment processes. Partnered with QA and Product Owners in Agile/Scrum to deliver high-priority features aligned with business needs. Implemented proactive monitoring and issue resolution using Splunk, minimizing downtim

Software Developer at Cerebro Capital

Developed RESTful APIs with Spring Boot for portfolio and covenant tracking modules, improving system usability and integration. Designed Hibernate/JPA entities and repository layers with pagination and sorting features, enabling faster and structured data access. Authored and optimized SQL queries across MySQL and PostgreSQL, reducing query latency through indexing and tuning. Implemented bean validation and centralized exception handling, ensuring consistent error responses across all services. Integrated Spring Security with JWT-based authentication, strengthening RBAC for sensitive operations. Created and maintained API documentation using Swagger/OpenAPI, and shared Postman collections to streamline QA workflows. Conducted unit and integration testing with JUnit and Mockito, increasing coverage and improving application reliability. Supported Docker-based containerization and assisted with AWS EC2 deployments for UAT, expediting delivery schedules.

Application Analyst (Java) at Fiserv

Supported and enhanced enterprise-scale applications serving 200K+ daily users, ensuring high reliability and scalability for financial platforms. Designed and managed an authorization microservice enabling secure login, registration, and authentication, reducing onboarding failures. Migrated Struts and SOAP modules into Spring Boot REST microservices, improving maintainability and reducing system latency. Automated deployments through GitLab CI/CD pipelines integrated with vulnerability scans (Fortify, SCA, WebInspect), accelerating delivery. Enhanced quality assurance by developing unit and integration tests with JUnit, Mockito, and Postman, reducing production incidents. Optimized application servers (Tomcat, Jetty, WildFly) and XML configurations, improving response times and deployment processes. Partnered with QA and Product Owners in Agile/Scrum to deliver high-priority features aligned with business needs. Implemented proactive monitoring and issue resolution using Splunk, mini