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Hung-Chih Liu
Mid-level Distributed Systems & AI Infrastructure Engineer
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Backend/full-stack engineer (Amazon experience) who built an AWS-based integration testing platform using Flask, ECS, Docker, and CloudWatch—cutting 1000+ test cases from ~5 hours to ~30 minutes while improving log visibility for non-engineering users. Also led a zero-downtime EU region migration with rigorous ORR testing, and built a Kinesis/Firehose/S3 + Glue/Spark replay mechanism for resilient data recovery. Side project: reproducible, cost-efficient LLM hosting platform on EKS using CDK and Karpenter for scale-to-zero.
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Key Strengths
- Parallelized 1000+ integration tests from ~5 hours to ~30 minutes using ECS orchestration
- Built Python controller to provision ECS tasks and orchestrate Docker-based test environments
- Improved failure visibility by programmatically pulling/parsing CloudWatch logs and returning API error summaries
- Led zero-downtime AWS region migration (eu-west-1 to eu-south-2) with phased cutover and ORR validation
- Designed ORR process with full API coverage integration tests, canary, stress, and load testing
- Designed Kinesis-to-S3 replay pipeline with Glue/Spark for disaster recovery of a precompute store
- Mitigated dependency throttling (429s) via a 'lazy update' replay strategy and traffic redirection logic
- Applied GitOps with CDK as single source of truth, multi-stage promotion (alpha/beta/gamma/prod), and mandatory peer review
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