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Eoin McDonnell
Staff Full-Stack & DevOps Engineer specializing in cloud-native platforms and AI
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Backend/data engineer focused on production Python and AWS: built FastAPI REST services and a containerized ECS Fargate + Lambda architecture deployed via Terraform/CI-CD. Strong in data engineering (Glue/S3/Parquet/RDS) and operational reliability (CloudWatch/SNS, retries, schema-evolution handling), with experience modernizing legacy SAS reporting into Python microservices using feature flags and parity validation.
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Key Strengths
- Designed modular, stateless FastAPI services with separation of routing/business/data layers
- Implemented API reliability patterns: JWT auth, RBAC, request timeouts, standardized error responses
- Delivered AWS production platform using ECS Fargate microservices plus Lambda for async/event-driven workflows
- Infrastructure-as-code and automated deployments with Terraform and CI/CD building/testing Docker images
- Secure configuration management using Secrets Manager/SSM with IAM role-based access
- Built AWS Glue ETL from S3 and RDS/Postgres to partitioned Parquet on S3 with crawlers and schema evolution handling
- Operationalized pipelines with CloudWatch monitoring/alarms, retries, and SNS notifications for failures
- Modernized SAS reporting into Python microservice; validated parity via side-by-side historical comparisons and stakeholder sign-off; reduced migration risk with feature flags and fallback
- Improved SQL performance using composite indexes and partition pruning, reducing runtime to under 3 minutes
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