Santiago G

Cloud Backend Developer

SK Innovation • Trabajador autónomo

Jun 2024 - Present • 2 yrs 2 mos

Serverless and event-driven systems built independently on AWS. PayStream Pipeline — Lambda · API Gateway · Kinesis · DynamoDB · SQS · CDK 5,000 events processed with zero data loss and zero DLQ messages. 90% reduction in Lambda invocations via Kinesis batching and DynamoDB GSI. Full infrastructure as code with AWS CDK. ADR governance CI in GitHub Actions — architectural violations block merge to main. github.com/peporerto/aws-kinesis-reliability-demo CloudFront CDN + Signed URL Architecture — S3 · CloudFront · OAC · RSA-2048 87% cache hit ratio, 67% cost reduction vs direct S3 access. github.com/peporerto/cdn-portfolio Infrastructure as Code — Terraform · Jenkins · Docker Automated AWS infrastructure provisioning using Terraform modules orchestrated through a Jenkins + Docker CI/CD pipeline. github.com/peporerto/Jenkins-Docker-Terraform-y-AWS

Back End Developer

Poapoa • Tiempo completo

Mar 2026 - May 2026 • 2 mos

Independently developed 2 complete services (Learning, Medical) and contributed to 3 others (Security, Finance, Entities) • Designed MySQL schemas following domain-driven design with active participation in architecture decisions • Implemented Kafka-based event-driven architecture with 15+ topics for inter-service messaging • Built authentication service with JWT, OAuth, RBAC, and MFA handling 10,000+ daily requests • Developed admin dashboard microservice consuming read-only database views for metrics • Deployed containerized services to ECS Fargate via CodePipeline with health checks and autoscaling • Integrated CloudFront CDN with signed URLs managing 2TB+ storage, reducing costs 40% • Implemented Redis caching reducing API response time from 850ms to 187ms (78% improvement) • Built payment gateway integration with secure authentication and bot protection