Tuned stored procedures and production database indexes, reducing query times by up to 40%. Built internal audit solutions for AT&T using AWS, Azure, SQL, and Kafka, improving automation and traceability for critical business processes. Led design and development under Scrum with CI/CD and Jira, shortening release cycles in a sustained way. Designed and implemented tables, triggers, and stored procedures aligned with business needs, improving schema maintainability and scalability. Identified and resolved bottlenecks through deep database object analysis, reducing critical performance incidents under high concurrency.

Designed and delivered B2B software projects in a Scrum environment. Tier-2 technical support for U.S. operations. Enhancements and upgrades on existing platforms.

Designed, planned, and built internal and external (B2B/B2C) projects, owning implementation and delivery coordination. Led high-criticality initiatives including technology refresh and database migrations (Oracle 10g→12c on Exadata; DB2→Oracle 12c), guiding cross-functional teams and ensuring continuity. Administered and tuned relational, NoSQL (Cassandra, CouchDB), and in-memory (TimesTen, Redis, Memcached) databases in high-demand production.

Full-stack development and database administration (Oracle 10g, SQL Server 2005), from feasibility to end-user training. Consultant on migration from the legacy Billing System to the Convergent Billing System (STC) for EMPAGUA; parameter administration and data mapping lead.

Administrative and accounting software using MySQL and DBF; full lifecycle from design to release. Web applications with HTML, JavaScript, and PHP (frontend and backend). Networks, servers, and application administration to keep production stable.