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Yihao Xie
Senior Backend Engineer specializing in Python and AWS serverless systems
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About
Backend/data engineer with Amazon supply-chain experience building production serverless Python services and ETL pipelines on AWS (Lambda, API Gateway, S3, RDS, Glue). Has modernized legacy SAS jobs into Python with rigorous parity testing and phased migrations, and has delivered major SQL performance gains (minutes down to seconds) through indexing and partitioning.
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Key Strengths
- Designed and operated serverless Python APIs (FastAPI on Lambda behind API Gateway) with caching and RDS
- Reliability engineering: layered timeouts, retries with exponential backoff, structured exception handling, and CloudWatch logging
- Built CI/CD + IaC deployments using AWS CDK (Python) and GitHub Actions with multi-environment workflows
- Secrets/config management at scale using Secrets Manager + Parameter Store with IAM least-privilege and rotation handling
- ETL/data engineering with AWS Glue (PySpark) from S3 CSV to Parquet/RDS with catalog updates and data quality validation
- Modernized legacy SAS batch logic to Python services with parity testing (row-by-row comparisons) and phased parallel cutover
- SQL performance optimization with execution plan analysis, composite indexes, and partitioning (e.g., 2 min to <10 sec improvement)
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