Hey, I'm Óscar

Data Engineer — UC3M & Kairós DS (Madrid, Spain)

· Designed and implemented end-to-end ETL data pipelines within AWS using Scala, Spark, and Python, processing gigabyte-scale datasets and reducing pipeline execution times by 30%.

· Orchestrated complex workflows using Apache Airflow, reducing data ingestion failures by 20% through automated retry mechanisms and real-time alerting.

· Optimized AWS cloud infrastructure costs by 15% through the migration and structuring of historical data lakes on Amazon S3 and Amazon Redshift, utilizing AWS Glue and Athena for data partitioning.

· Developed interactive Power BI dashboards connected to Athena and Redshift using dbt, reducing query cost and time by 40%.

Martech Engineer — Merkle (Gijón, Spain)

· Architected multi-platform first-party data collection systems that scaled to process over 15M monthly events across enterprise clients, boosting data accuracy by 25% and unlocking actionable insights for personalized marketing.

· Implemented user consent and privacy management frameworks adhering to GDPR/CCPA regulations, ensuring 100% compliance across digital assets without compromising web performance.

AWS Certified Data Engineer – Associate

In-depth understanding of how to use AWS services to implement data pipelines and to monitor, troubleshoot, and optimize cost and performance issues in accordance with best practices

Functional Programming in Scala

Coursera specialization program for Big Data using Scala and Spark