Alex M Lee

About

Backend/data engineer from Oscar Health specializing in healthcare claims systems on AWS. Built HIPAA-compliant real-time services (FastAPI/Postgres/Kafka on EKS) and serverless ingestion pipelines, and led modernization of a legacy SAS claims pricing system to Python/Spark with rigorous parity validation. Demonstrated measurable impact with high uptime/low latency services and major Snowflake performance and cost reductions.

Key Strengths

• Built and operated real-time claims processing backend on AWS EKS (FastAPI/Postgres/Kafka)
• Reliability engineering: retries/timeouts, circuit breakers, idempotent endpoints, health checks
• Achieved sub-100ms latency and 99.97% uptime for production service
• HIPAA-grade security implementation (TLS, KMS, PHI tokenization/encryption, secrets management, audit logging)
• Designed serverless + container ingestion architecture (API Gateway/Lambda → Kinesis/S3 → EKS/Argo)
• Infrastructure as Code and CI/CD ownership (Terraform, GitHub Actions, env-specific config, runtime config loading)
• Built healthcare claims ETL with AWS Glue into Snowflake with schema evolution strategy (DynamicFrames, versioned catalog, schema registry)
• Data quality and failure handling with Deequ, quarantine buckets, CloudWatch alerts, bookmarks/checkpointing
• Modernized legacy SAS claims pricing to Python/Spark microservices with parallel-run parity validation
• Snowflake performance optimization reducing runtime 45 min → <5 min and compute cost ~60%

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