Open to opportunities

Gelson de Souza Silva

@gelsondesouzasilva

Message

I build and support reliable Oracle enterprise systems, integrations, and production infrastructure.

Portugal

Message

What I'm looking for

I'm looking to build on my enterprise systems, Oracle, infrastructure, and integration experience while growing business, leadership, and digital transformation capabilities.

I've supported and evolved mission-critical Oracle and telecom systems at DXC Technology, Grupo Raviera, and enterprise client environments, working across databases, applications, integrations, and production operations.

I build Oracle APEX and PL/SQL solutions, optimize high-volume SQL, support database migrations, and apply patches and hotfixes with a focus on availability, security, performance, and data integrity.

I've also diagnosed Java API and microservice issues, automated operational processes with Python, administered Windows and Linux environments, and helped teams resolve incidents through root-cause analysis, documentation, validation, and end-user training.

Experience

Work history, roles, and key accomplishments

Current

PL/SQL Developer | Oracle APEX Developer

Current

Portugal (Remote - Service Agreement)

Apr 2025 - Present (1 year 5 months)

Develop and support enterprise Oracle solutions in production environments, with responsibility across database, application and operational reliability. Implement and configure Oracle APEX solutions and develop PL/SQL with emphasis on performance, data integrity and security.

Apex Pl SQL SQL Tuning Database Migration Performance Optimization Data Integrity Security Patching Upgrades Documentation

PL/SQL Developer | Oracle APEX Developer

IT Recruiter

Dec 2023 - Nov 2024 (11 months)

Developed and supported Oracle systems in an enterprise business context using Oracle APEX and Oracle Forms/Reports. Optimised reports and critical queries through SQL tuning and performance analysis.

Apex Oracle Forms SQL Tuning Performance Analysis Database Migration Windows Server IIS SSL SharePoint Business Process Automation

Systems Analyst

DXC Technology

Jun 2021 - Dec 2023 (2 years 6 months)

Supported and evolved critical Telecom systems with high-availability requirements in production environments. Performed advanced troubleshooting, debugging and incident resolution across application, database and integration layers.

SQL Oracle Pl SQL Java Python Jira Windows Server Troubleshooting Incident resolution Root Cause Analysis Microservices APIs

Systems Analyst

Grupo Raviera

Jan 2016 - May 2021 (5 years 4 months)

Spent five years supporting complex, integrated Oracle systems in production environments. Implemented and configured Oracle APEX and PL/SQL solutions and performed Oracle database administration covering backup, recovery, security and permissions.

Java Pl SQL SQL Oracle APIs Dynatrace Grafana UML Agile Jira Confluence SoapUI Database Administration Backup Recovery Security Permissions End User Training

Infrastructure Analyst

Various companies

Jan 2010 - Dec 2017 (7 years 11 months)

Administered Windows and Linux servers and enterprise networks across multiple environments. Configured and managed firewall, proxy and Cisco equipment, diagnosed connectivity and permission issues, and supported virtualization and server environments.