Open to opportunities

Ronel Mendoza

@ronelmendoza

Message

Software Engineer III with 10+ years building scalable Java/React SaaS systems and cloud-native pipelines.

Brazil

Message

What I'm looking for

I’m looking for a team where I can architect scalable Java/React SaaS systems, own secure authentication and CI/CD, and keep improving reliability, performance, and developer velocity with modern cloud-native practices.

I’m a Software Engineer III with 10+ years of experience designing and delivering scalable, enterprise-grade web and SaaS applications across finance, education, and enterprise domains. I specialize in Java, React.js, Spring Boot, PostgreSQL, MongoDB, and microservices architecture—building maintainable systems that perform under real production load.

In my most recent roles, I’ve architected RESTful and GraphQL APIs, improved data retrieval efficiency by ~35%, and enhanced user experience and adoption by ~40% through responsive React features and secure authentication flows (OAuth2, JWT, role-based access control). I also build cloud-native deployments on AWS and Azure with Docker and Kubernetes, strengthen reliability with ~90% automated test coverage, and accelerate release cycles by ~50% using CI/CD pipelines (GitHub Actions, Jenkins).

Experience

Work history, roles, and key accomplishments

Current

Senior Software Engineer

Current

VC3

Feb 2020 - Present (6 years 4 months)

Architected enterprise Java/React SaaS services using Spring Boot and Hibernate, supporting ~250k users and improving data retrieval efficiency by ~35%. Built secure OAuth2/JWT authorization, microservices with RabbitMQ, and CI/CD pipelines that increased release speed by ~50% while raising uptime to 99.99%.

Java React Spring Boot Hibernate PostgreSQL MongoDB Microservices RabbitMQ OAUTH2 CI CD

Senior Engineer

Innovative Control Systems, Inc

Mar 2019 - Feb 2020 (11 months)

Delivered enterprise Java and React applications with Spring Boot and Hibernate for high-traffic SaaS workflows supporting ~250k users. Implemented REST/GraphQL APIs, microservices with RabbitMQ, OAuth2/JWT security, and automated testing, increasing test coverage to ~90% and reducing production defects by ~35%.

Java React Spring Boot GraphQL PostgreSQL MongoDB Microservices RabbitMQ OAUTH2 Automated Testing

Software Engineer

SunGard K-12

Jul 2015 - Mar 2019 (3 years 8 months)

Built and maintained enterprise Java/React solutions with Spring Boot, delivering scalable backend services for high-traffic SaaS platforms supporting ~250k users. Developed REST/GraphQL APIs, secure OAuth2/JWT access control, microservices with RabbitMQ, and CI/CD automation to accelerate releases by ~50%.