Renny Valera
Software Architect & Senior Developer | Backend · Microservices · Cloud-Native
valerarenny@gmail.com · Caracas, Venezuela · https://linkedin.com/in/rennyvalera · https://github.com/valerarenny
Professional Summary
Java Developer with 8+ years of experience building enterprise applications, REST microservices, and event-driven systems. Deep expertise in Java (Quarkus, Spring Boot, Spring MVC, JavaEE), API security with Keycloak (OAuth2/JWT), and API management through 3scale. Experienced with OpenShift, Kubernetes, and Docker for cloud-native deployments, and with Apache Kafka and ActiveMQ for asynchronous messaging. Having worked across both frontend and backend, I bring a holistic understanding of end-to-end software architecture. Additional background in .NET/C#, frontend development with React (JavaScript/TypeScript), NestJS, and DataGrid. Holds a C1 Advanced English certificate and strong experience in DDD, microservices, and event-driven architectures.
Technical Skills
- Backend: Java, Quarkus, Spring Boot, Spring MVC, Spring Cloud, OpenFeign, JavaEE, .NET C# (MVC5 / Core), WCF, NestJS (Node.js), Maven, Gradle, Resilience4j
- Frontend: React (JavaScript, TypeScript), Vue.js, Bootstrap
- Databases: PostgreSQL, MySQL, SQL Server, MongoDB, Redis, DataGrid, Hibernate / JPA, Liquibase
- Cloud & DevOps: OpenShift (Red Hat), Kubernetes, Docker, CI/CD Pipelines, Azure DevOps (ADO), Git, GitHub, GitLab, Helm, ArgoCD, Tekton (OpenShift Pipelines)
- API Management: 3scale, Keycloak (OAuth2 / JWT), Red Hat build of Keycloak, OpenAPI 3, gRPC, Swagger UI
- Messaging: Apache Kafka, ActiveMQ, AMQ Streams
- Observability: Prometheus, Grafana, ELK / Loki, OpenTelemetry
- Architecture: Microservices, REST APIs, BFF (Backend for Frontend), Event-Driven (DDD), AS400 Integration
- Testing: JUnit, Mockito, REST Assured, SonarQube
- Methodology: Agile / Scrum, Jira
- AI / LLM: Ollama, Self-hosted LLMs (Qwen), Chatbot Integration, Prompt Engineering
Professional Experience
Service Integration Lead — Telefonica, Venezuela
September 2023 - Present
- Designed and led integration of backend services using Java and REST microservices architecture.
- Applied Keycloak for OAuth2/JWT-based authentication and API Gateway security.
- Managed API lifecycle and traffic policies using 3scale API Management.
- Deployed and maintained services on OpenShift (Red Hat) with Docker containerization.
- Implemented CI/CD pipelines to streamline build, test, and deployment workflows.
- Used Apache Kafka for event-driven inter-service communication.
- Leveraged Redis for caching and session management.
Software Engineer - Java Consultant — DirMOD, Argentina
September 2022 - December 2023
- Delivered Java consulting services, developing and reviewing microservices-based solutions.
- Built event-driven microservices with Spring Boot and Apache Kafka.
- Implemented JWT/OAuth2 security patterns for API authentication.
- Worked with PostgreSQL and MongoDB for data persistence in distributed systems.
- Contributed to containerized deployments using Docker and Kubernetes.
Software Engineer — Zutun, Lima, Peru
April 2022 - August 2022
- Worked on Insuma, a multi-tenant insurance platform, integrating reporting services into the existing Java-based system.
- Worked with REST APIs and Spring Boot to expose reporting capabilities across tenants.
Software Developer - Java Consultant — DBAccess / Paxer
April 2018 - April 2022
- Developed and maintained Java enterprise applications for multiple client projects.
- Worked on Paxer, a PHP/Java Property Management System (PMS), developing and maintaining features across the stack.
- Built microservices with Spring Boot, integrating AS400 systems via sockets and message queues.
- Used Apache Kafka and ActiveMQ for asynchronous messaging and event-driven workflows.
- Designed REST APIs with JWT/OAuth2 authentication consumed by web and mobile clients.
- Managed relational databases (PostgreSQL, MySQL, SQL Server) and MongoDB.
- Collaborated on Docker-based containerization and application deployment.
Software Developer - .NET — Legendsoft, Miranda, Venezuela
January 2018 - April 2018
- Developed business applications using .NET MVC 5 (C#).
- Built MVC web interfaces and integrated SQL Server backend data layers.
Software Developer — IQuantics Corp
July 2016 - December 2017
- Developed enterprise .NET and Java applications for corporate clients.
- Worked with WCF services for data storage and SQL Server migrations from AS400 using SSIS.
- Built Reporting Services reports from SQL Server data.
Projects
AI-Powered CV / Portfolio Website
Next.js · TypeScript · Ollama · Cloudflare Tunnel
- Built a personal portfolio site with an integrated AI chatbot that answers questions about my professional background.
- Integrated a self-hosted LLM (Qwen on Ollama) running on local hardware, exposed securely through a Cloudflare Tunnel.
Education
Bachelor of Computer Engineering (Ingenieria Informatica) — Universidad Alejandro de Humboldt (2013 - 2017)
Certifications
- EF SET English Certificate - C1 Advanced (66/100)
- Java Unit Testing with JUnit and Mockito
- Modern Software Architecture: DDD, Events, Microservices