Looking for a job

Justin Mui

@justinmui

Message

Senior Data Engineer driving scalable lakehouse and GenAI solutions.

United States

Message

What I'm looking for

I seek roles where I can lead data platform modernization and GenAI initiatives, mentor engineers, and deliver compliant, production-grade lakehouse and ML solutions in highly regulated environments.

I am a Senior Data Engineer with 10+ years building scalable data platforms, lakehouses, and AI/ML-powered pipelines across pharma and HCM domains. I led enterprise Databricks/AWS/Azure initiatives, delivered GenAI solutions like GPTeal, and integrated GxP-sensitive systems to meet FDA and HIPAA requirements.

I have a proven record of improving performance and efficiency—cutting clinical report creation time by 70%, increasing ETL throughput 300%, and reducing production incidents by 25%—while mentoring teams and advising leadership on data strategy and modernization roadmaps.

Experience

Work history, roles, and key accomplishments

Current

Senior Data Engineer

Current

Merck

Jan 2023 - Present (2 years 11 months)

Led development of Merck's GPTeal GenAI platform and lakehouse pipelines, cutting clinical report creation time by 70% and saving 100+ hours/month while achieving GxP/FDA audit readiness within 6 weeks.

Databricks Delta Lake Python Spark AWS Azure Terraform CI CD GenAI

Database Engineer

Merck

Jul 2019 - Jan 2023 (3 years 6 months)

Architected the MANTIS manufacturing data lake on AWS, unifying 100+ systems to deliver 3× query performance and 50% lower compute cost while boosting ETL throughput 300% and ensuring GxP auditability.

AWS S3 Glue Redshift Spark Kinesis Sagemaker Data Lake Disaster Recovery

Database Engineer

ADP

Sep 2014 - Jul 2019 (4 years 10 months)

Designed and scaled DataCloud ETL pipelines processing data for 90K clients and 30M+ employees, accelerating ML feature production and reducing query latency by 70% to enable sub-second analytics for 10K+ users.