HamzaGabajiwala

Software Development Engineer I · Dublin, Ireland

• Built 0+ Airflow DAGs processing 0.00B+ daily events across 0+ audience segments on AWS EMR.
• Built real-time multi-level ad targeting in Flink — evaluating campaigns at package and order granularity by extending the Java segment cache.
• Shipped Yahoo Standard Audiences to production — built the OpenSearch rules pipeline improving 0+ audience definitions, expanding reach by 0%.
• Migrated 4 scoring systems to new infrastructure, cutting costs 0% and upgrading to EMR v7.
• Designed a reprocessing system to recover audience segments dropped by the hourly pipeline, covering 0K+ segments with health-check alerting.
• Shipped geo-aware audience segmentation with country-level targeting. Authored system design for impression-based scoring processing 0GB+ daily.

Software Developer · Mumbai, India

• Migrated 0+ test cases from Selenium to WebDriver in 0 days — manual regression to automated nightly runs.
• Cut data-collection downtime by 0% with REST API ingestion, enabling same-day reporting.