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Yuanhui Yang
Senior Software Engineer specializing in Python backend systems on AWS
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Backend/data engineer from ASML who modernized a legacy SAS-based statistical processing system into a cloud-native AWS platform (Lambda/FastAPI, Step Functions/EventBridge, Glue, S3/RDS) with strong reliability and data-quality practices. Demonstrated measurable performance wins (RDS query reduced from 90+ seconds to <5 seconds) and hands-on incident ownership for production ETL pipelines.
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Key Strengths
- Built and maintained production serverless, event-driven Python backends on AWS (Lambda, API Gateway, Step Functions, EventBridge)
- Modernized legacy SAS statistical workflows to cloud-native Python services with incremental migration and stakeholder sign-off
- Designed reliable APIs/pipelines with auth, retries (exponential backoff), timeouts, structured error handling, and CloudWatch-based observability
- Implemented data quality controls and schema evolution strategies (Glue crawlers/catalog, S3 versioning/partitioning, RDS migrations)
- Delivered robust CI/CD with automated tests, linting/static analysis, staged releases, blue/green and rolling deployments, and rollback readiness
- Optimized production SQL workloads (indexes/partitioning/query rewrites/batching) reducing a 90+ second query to under 5 seconds
- Owned production data-pipeline incidents end-to-end: detection via alarms, log/metric triage, mitigation via quarantine/manual processing, and prevention via monitoring/runbooks
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