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Alan Grusy

@alangrusy

Message

I build real-time and batch data platforms for healthcare claims and financial transactions.

United States

Message

At Oscar Health, I build real-time healthcare claims pipelines processing 15M+ daily insurance claims and PHI. I reduced end-to-end latency by 40%, raised first-pass yield from 90% to 95%, and strengthened HIPAA-compliant data reliability.

I've also delivered payment-data migrations and integration platforms for FinovaPay, PaySphere Financial, and FinovaBank, using Python, SQL, Spark, Kafka, Snowflake, Databricks, AWS, and Azure. I modernize data architecture, automate quality and deployment workflows, and mentor engineers through technical reviews and standards.

Experience

Work history, roles, and key accomplishments

Current

Senior Data Engineer

Current

Oscar Health

Oct 2021 - Present (4 years 11 months)

Led design and development of real-time healthcare claims data pipelines processing 15M+ daily claims, reducing latency by 40% and increasing First-Pass Yield from 90% to 95%. Established data platform standards, optimized large-scale transformations, and mentored engineers.

Python SQL Spark PySpark Polars Pandas Kafka Snowflake Databricks Airflow DBT AWS Apache Flink Terraform GitHub Actions Claude Code

Data Engineer

Cognizant Softvision

Sep 2019 - Nov 2021 (2 years 2 months)

Built and supported cloud data pipelines for payment and transaction platforms using AWS and Azure. Developed migration and integration workflows with Python, SQL, Airflow, AWS DMS, Debezium CDC, and Azure Data Factory, with automated reconciliation, data-quality validation, monitoring, and production optimization.

Data Engineer

IBM

May 2017 - Sep 2019 (2 years 4 months)

Built scalable ETL and batch data-processing pipelines for payment and transaction data using IBM DataStage, SQL, Python, Hadoop, HDFS, and Apache Spark. Implemented data-quality, reconciliation, and source-to-target validation while optimizing SQL and Spark workloads to improve processing efficiency and reporting reliability.