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Sara Fang
Mid-level Software Engineer specializing in cloud data platforms and distributed systems
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About
Backend/data engineer with production experience building FastAPI services with strong reliability patterns (circuit breaker, rate limiting, caching, graceful degradation) and JWT/OAuth2 auth. Has delivered AWS EKS deployments via Terraform with Secrets Manager/IRSA and HPA autoscaling, and built Glue/Spark ETL pipelines on S3 Parquet with schema-evolution and idempotent reruns; also demonstrated measurable SQL tuning impact (20–30s to <10s).
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Key Strengths
- Built reliability mechanisms in FastAPI services (circuit breaker, rate limiting, TTL cache, graceful degradation)
- Implemented JWT/OAuth2 authentication for backend APIs
- Prevented cascading failures from downstream dependency outages using circuit breaker with bounded retries (max 5)
- Deployed services to AWS EKS using Terraform with secure secrets management (Secrets Manager, IRSA)
- Implemented dynamic scaling via Kubernetes HPA
- Designed AWS Glue/Spark ETL on S3 Parquet with Glue Data Catalog integration
- Handled schema evolution with backward-compatible changes (e.g., adding nullable columns)
- Improved SQL performance via date partitioning (latency reduced from 20–30s to <10s)
- Production incident handling with CloudWatch alerts, telemetry/log-based triage, client comms with recovery ETA, and improved alerting/schema governance
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