Hung-Chih Liu

About

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.

Experience

Education

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