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Ulises Cardona Tavarez

@ulisescardonatavarez

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Java backend developer at Sistemas Premium who developed a PLD integration and doubled production release frequency.

Mexico

Message

At Sistemas Premium, I developed Java and Spring Boot REST APIs and enterprise integrations, including a PLD integration for vulnerable operations. I also participated in separating databases to optimize CFDI stamping.

As Tech Lead, I coordinated technical work for four developers and two QA team members, and doubled production release frequency from every 30 days to every 15. Earlier, I optimized PostgreSQL CFDI queries from 8 seconds to 2–3 seconds and developed Java microservices at Transportes Castores.

Experience

Work history, roles, and key accomplishments

Tech Lead

Sistemas Premium

Oct 2024 - Aug 2026 (1 year 10 months)

Developed REST APIs and enterprise integrations with Java and Spring Boot. Coordinated technical activities for 4 developers and 2 QA, and doubled release frequency from every 30 to every 15 days.

Java Spring Boot Hibernate PostgreSQL SQL Server Gitlab Jira Confluence REST APIs Microservices

Full Stack Developer

Sistemas Premium

Aug 2023 - Oct 2024 (1 year 2 months)

Optimized CFDI queries in PostgreSQL reducing response times from 8 to 2-3 seconds. Refactored the billing core with caching and developed features for Carta Porte and REST service integrations.

Java EE Spring Boot Hibernate PostgreSQL SQL Server Gitlab REST Caching Performance Optimization

Analista Desarrollador Jr.

Transportes Castores

Aug 2022 - Aug 2023 (1 year)

Developed microservices from scratch using Java 8, Spring Boot, and PostgreSQL. Implemented logistics reporting with scheduled tasks and migrated data from Excel to PostgreSQL.

Java 8 Spring Boot PostgreSQL Delphi Microservices Scheduled tasks Data Migration

Desarrollador Web Jr.

Interlab

Nov 2021 - Jul 2022 (8 months)

Automated supply discounts and low inventory alerts based on clinical studies. Modernized interfaces with Bootstrap and reused data queries to reduce duplication.

PHP MySQL JavaScript HTML CSS Bootstrap