David Seijas

Senior Software Engineer with 13+ years building backend systems, RESTful and SOAP web services, and service-oriented / microservices-style architectures for public- and private-sector clients. Deep expertise in Java (8–21), Spring Boot/MVC, and Oracle PL/SQL, with a track record of modernizing legacy platforms, improving throughput through multithreading, and hardening applications with Veracode security scanning. Comfortable owning a service end-to-end — from data model and API design through deployment and production support.

Senior Software Engineer (Sr. Application Development Analyst) - Tekbank Consultants Inc. (FDOT Contractor) - Boca Raton, FL

(2020-04 - 2026-08)

• Led migration of mission-critical enterprise applications from Java 8 to Java 17 and engineered multithreaded processing to increase data-processing throughput.
• Designed and built secure, RESTful backend APIs with Spring and JAX-RS to aggregate data across multiple district services for statewide FDOT enterprise applications, using a microservices-style integration approach.
• Maintained and tuned Oracle 12c systems; migrated backend connections from Hibernate to high-performance JDBC connection pooling while preserving existing business logic.
• Used Veracode to identify and remediate code vulnerabilities, establishing standard processes for ongoing application security compliance across the codebase.
• Owned full deployment lifecycles on JBoss/WildFly using Gradle and Maven, ensuring configuration accuracy across production environments.

Software Engineer (Java Web Application Developer) - AlphaStaff, Inc. - Ft. Lauderdale, FL

(2015-11 - 2020-03)

• Engineered integration services in Java and APEX to synchronize data across PRISMHR, Kronos, and Salesforce — a multi-system integration pattern consistent with modern microservices/event-driven design.
• Built and maintained a Kronos middleware service to automate daily employee data updates via API, replacing manual CSV imports and eliminating a recurring source of data errors.
• Managed on-premise hosting and Tomcat deployments for the PrismHR SaaS platform, supporting customized PEO solutions for hundreds of client organizations.
• Refactored legacy services to support current API versions and led QA testing on API versioning to ensure backward compatibility and service continuity.

Software Engineer (Software Developer) - TRAX USA Corp. - Coconut Grove, FL

(2012-05 - 2015-10)

• Built Java/Spring/Hibernate web service layers handling XML/XSL data transformation for aerospace client interfaces.
• Migrated legacy C# .NET interfaces to Java-based architectures, consolidating platforms and reducing long-term maintenance overhead.
• Developed scheduled jobs, triggers, and PL/SQL packages in Oracle (9g–11g) to automate Warehouse Management System (WMS) workflows.
• Traveled onsite to international customer locations (Turkish Technic, WestJet, AZUL) to lead technical implementation, testing, and go-live support.

B.S. - Computer Engineering - Florida International University