Harold Barberena

Senior Software Engineer

Rula

Jun 2024 - Current (1 year 11 months)

Designed and deployed a HIPAA-compliant microservices architecture using Java/Kotlin + Spring Boot & Hibernate, reducing PHI exposure risk by 40% (vulnerability findings dropped from 15 → 9 after redesign).Built and optimized Spring Boot-based healthcare microservices, improving claim-processing throughput by 52% (1,900 req/min → 2,890 req/min) under peak load.Developed AI-driven clinical analysis pipelines using Java/Kotlin microservices integrated with ML engines, accelerating diagnostic-data processing by 65% (12 minutes → 4.2 minutes per dataset).Enhanced encrypted API communication (REST + gRPC) with Spring Security, decreasing integration errors by 33% (45 → 30 monthly error reports) across EHR partner systems.Implemented Keycloak for

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Senior Full Stack Engineer

CareSimple

Oct 2022 - May 2024 (1 year 8 months)

Engineered full-stack features using Java/Kotlin + Spring Boot and React/TypeScript, turning complex healthcare-workflow requirements into production-ready releases 22% faster than the previous cycle.Built a real-time logistics engine powering the movement of medical devices to remote patients, boosting shipment-tracking precision from 82% → 96% and giving clinicians up-to-the-minute shipment visibility.Modernized global state management by adopting Redux Toolkit, cutting UI render overhead by 45% and making patient-monitoring dashboards noticeably smoother during live consultations.Transformed monolithic back-end processes into containerized Spring Boot microservices deployed on AWS ECS + Fargate, raising platform uptime to 99.9% while red

Full Stack Engineer

MedSpecialized

Jul 2018 - Sep 2022 (4 years 3 months)

Contributed to a cross-functional healthcare IT team led by U.S.-based executives, delivering HIPAA-aligned telehealth and patient-care features through Java/Spring Boot and modern web platforms.Developed high-performance web and mobile modules using Java Spring Boot, Hibernate, React Native, and Apollo/GraphQL, supporting thousands of daily patient interactions across remote-care programs.Led 2 major projects (Telehealth Scheduling System & Patient Assessment Dashboard), improving release velocity by 34% and strengthening collaboration with U.S. clinical stakeholders.Mentored 3 junior developers, formalizing code reviews, introducing pair-programming routines, and reducing onboarding time from 6 weeks → 3.5 weeks while improving overall co

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Full Stack Developer

&you

Nov 2014 - Jul 2018 (3 years 9 months)

Learned and applied core web-development skills using HTML, CSS, JavaScript, jQuery, and Angular, contributing to patient-facing healthcare modules used by clinicians and support teams.Built and maintained RESTful APIs in Java/Spring Boot with Spring Data JPA + Hibernate for insurance-claims and repayment workflows, improving API response time by 40% through optimized indexing and query tuning.Improved the performance of several high-traffic Spring Boot endpoints by up to 90%, reducing server load and stabilizing PostgreSQL under heavy peak-hour usage.Helped develop a new web application from scratch using Angular + Spring Boot + Hibernate, implementing reusable UI components and responsive layouts, which improved cross-browser stability by

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