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George Yu
Senior Full-Stack & Mobile Engineer specializing in Node.js and React
San Francisco, CASenior Software Engineer12 years experienceSeniorMarketplace PlatformsE-commerceBiotechnology
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About
Backend engineer with TaskRabbit experience building and operating payment/booking services in Python/Django on AWS (ECS + Lambda) with Kafka/SQS eventing. Demonstrates strong production reliability and incident ownership in high-stakes payment flows (idempotency, strict timeouts, retries, monitoring/alerting) plus data/ETL work in AWS Glue and measurable SQL performance wins.
Experience
Senior Software EngineerTaskRabbit
Software EngineerSenti Biosciences
Independent Web DeveloperIndie Dev
Software EngineerAutoridad Nacional para la Innovación Gubernamental
Education
Universidad Tecnológica de Panamábachelor, Computer Engineering (2015)
Key Strengths
- Built and maintained payment/booking backend APIs in Django within a microservices architecture
- Reliability engineering for payments: strict timeouts, retries with backoff, and idempotent APIs to prevent double charges
- Production monitoring/observability with metrics, custom logging, dashboards, and PagerDuty alerting
- AWS delivery using ECS + Lambda event-driven architecture (SQS/Kafka), with CloudFormation IaC and GitHub Actions CI/CD
- Cost optimization on AWS via alarms on spend spikes, right-sizing, concurrency limits, and bounded autoscaling
- ETL ownership with AWS Glue (crawlers/jobs), schema evolution handling, and data quality checks
- Modernized monolith logic into smaller services using parallel runs and gradual traffic cutover with rollback
- SQL performance tuning: reduced a booking history query from ~2s to <300ms via composite index and query rewrite
- Incident response for batch processing: detected via CloudWatch, halted payouts to prevent impact, fixed transform, backfilled, and added schema checks
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