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Matthews Rmz

@matthewsrmz

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ETL Tester at BANBAJÍO who validated a data warehouse migration from Oracle sources to PostgreSQL targets.

Mexico

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At BANBAJÍO, I supported data warehouse migration and validation from Oracle source systems to PostgreSQL targets. I wrote SQL queries to reconcile datasets, check business rules, and investigate discrepancies across source, ETL, and target layers.

I’ve also validated Power BI dashboards at HDI and tested internal workforce software at OPORTUN. In my portfolio, I demonstrate repeatable data checks with Python, pytest, and PostgreSQL, alongside browser automation with Playwright and TypeScript.

Experience

Work history, roles, and key accomplishments

ETL Tester

BanBajío

Nov 2024 - Sep 2026 (1 year 10 months)

Supported data warehouse migration and validation involving SQL/Oracle source systems and PostgreSQL targets. Designed and executed SQL validation queries to compare record counts, reconcile datasets, and verify business rules.

SQL Oracle PostgreSQL ETL Testing Data Validation Data Reconciliation Stratio PySpark Visual Studio DBeaver Beyond Compare Regression Testing End To End Testing

QA Analyst

HDI

Jul 2023 - Sep 2024 (1 year 2 months)

Validated Power BI dashboards and KPIs using data sourced from Snowflake/data warehouse environments. Used SQL to reconcile report values against underlying data and designed functional, integration, API, and UAT test cases.

Power BI Snowflake SQL Data Validation Functional Testing Integration Testing API Testing UAT Postman Defect Tracking

User Tester

Oportun

Oct 2017 - May 2023 (5 years 7 months)

Performed user, functional, and regression testing for internal workforce software. Designed requirement-based scenarios, executed test cases, and followed defects through resolution.

Jira Jenkins MySQL MariaDB MongoDB S3 Functional Testing Regression Testing Test Case Design Defect Tracking

Bilingual Customer Service Supervisor

Oportun

Apr 2016 - Oct 2017 (1 year 6 months)

Created performance dashboards and KPIs to track service levels, productivity, and quality. Conducted quality audits of customer-service calls and delivered structured feedback.

Performance Dashboards KPIs Quality Audits Customer Service Data Analysis