Oi/Telemar

Software Developer
August 2011 - March 2014 (2 years 8 months)
Belo Horizonte Area, Brazil

As a Software Developer, I worked on a mission-critical sales operations platform designed to centralize and consolidate customer data from multiple enterprise systems into a single interface for operational teams.

The platform served as a unified data layer for customer and sales information, aggregating and synchronizing data from heterogeneous internal systems across the organization.

Backend & Integrations

I was responsible for building and maintaining enterprise system integrations using PHP with Zend Framework, implementing SOAP-based APIs with XML payloads to enable reliable communication between legacy enterprise platforms and the sales operations system.

Data Pipelines

I developed data ingestion and transformation pipelines using Pentaho ETL, extracting and processing data from SQL Server databases and structured files distributed across multiple internal directories. This enabled consistent consolidation of data from diverse enterprise sources.

Frontend Development

On the frontend, I worked on modernizing and refactoring complex legacy interfaces built with HTML and CSS, migrating them into structured components using ExtJS and jQuery. This improved maintainability, UI consistency, and overall system structure.

I also contributed to significant performance improvements by refactoring heavily loaded screens with large component trees, breaking down responsibilities and optimizing rendering behavior, resulting in a smoother and more responsive user experience for operational teams.

Impact

This role required strong expertise in legacy system integration, enterprise data pipelines, and performance optimization in complex, data-heavy applications.

Key Technologies

Frontend: ExtJS, jQuery, HTML, CSS
Backend: PHP, Zend Framework
Integration: SOAP APIs, XML
Data: Pentaho ETL, SQL Server
Focus: Enterprise integrations, data pipelines, legacy modernization, performance optimization