Carlo Marquez

Designed and developed enterprise applications for healthcare and financial services clients using Java, Spring Boot, React, Python, TypeScript, and Node.js. Built and maintained 10+ Spring Boot microservices with REST APIs, gRPC, API gateways, authentication, and distributed system patterns. Implemented secure GraphQL and enterprise security integrations using OAuth2 and JWT, and architected REST APIs with caching strategies that improved response times (800ms to 300ms). Optimized database schemas and SQL across PostgreSQL and Oracle, improving critical query performance by 35%. Delivered AWS-based deployment solutions (EC2, ECS, Lambda, S3, RDS, CloudWatch) targeting 99.9% availability, and introduced observability via Prometheus and Grafana for AKS clusters. Built event-driven systems using Kafka and RabbitMQ for asynchronous communication. Integrated GenAI features using OpenAI APIs and LangChain (RAG pipelines, vector embeddings) for document search/knowledge retrieval. Implemente

Designed and built enterprise applications for healthcare and financial services using Java, Spring Boot, React, Python, TypeScript, and Node.js. Owned 10+ Spring Boot microservices with secure REST/gRPC APIs, authentication, and distributed system patterns, integrating internal and external systems via GraphQL and OAuth2/JWT. Improved performance with advanced caching and query optimization on PostgreSQL/Oracle, introduced observability using Prometheus/Grafana, and supported high availability deployments using AWS services. Implemented event-driven messaging with Kafka and RabbitMQ. Delivered generative AI capabilities with LangChain-based RAG pipelines, and worked on healthcare data interoperability using FHIR and EDI pipelines with AWS ECS/Fargate and DynamoDB.

Developed cloud ERP capabilities serving 100K users across accounting, CRM, inventory, procurement, and HR. Built 8+ ERP modules using Java, Spring Boot, Hibernate, and REST APIs, and created React/TypeScript dashboards for reporting and workflow management. Contributed to a microservices-based SaaS architecture enabling independent deployment of ERP domains, optimized multiple data stores (PostgreSQL/MySQL/SQL Server/Redis), and implemented event-driven workflows using Kafka and RabbitMQ. Integrated 10+ third-party services (payments and external APIs), increased automated test coverage by 40% with unit/integration/API testing, and supported containerized deployments with Docker and CI/CD pipelines on AWS and Kubernetes.