Renny Valera

Java Developer | Backend & Microservices Specialist | AI & Cloud-Native Integrator

✉ valerarenny@gmail.com📍 Caracas, Venezuelain/ LinkedIn

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. 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

JavaQuarkusSpring BootSpring MVCSpring CloudJavaEE.NET C# (MVC5 / Core)WCFNestJS (Node.js)MavenGradleResilience4j

Frontend

React (JavaScript, TypeScript)Vue.jsBootstrap

Databases

PostgreSQLMySQLSQL ServerMongoDBRedisDataGridHibernate / JPALiquibase

Cloud & DevOps

OpenShift (Red Hat)KubernetesDockerCI/CD PipelinesAzure DevOps (ADO)GitGitHubGitLabHelmArgoCDTekton (OpenShift Pipelines)

API Management

3scaleKeycloak (OAuth2 / JWT)Red Hat build of KeycloakOpenAPI 3gRPCSwagger UI

Messaging

Apache KafkaActiveMQAMQ Streams

Observability

PrometheusGrafanaELK / LokiOpenTelemetry

Architecture

MicroservicesREST APIsEvent-Driven (DDD)AS400 Integration

Testing

JUnitMockitoREST AssuredSonarQube

Methodology

Agile / ScrumJira

AI / LLM

OllamaSelf-hosted LLMs (Qwen)Chatbot IntegrationPrompt Engineering

Professional Experience

Service Integration Lead

September 2023 - Present

Telefonica · Venezuela

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

September 2022 - December 2023

DirMOD · Argentina

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

April 2022 - August 2022

Zutun · Lima, Peru

Integrated a multi-tenant reporting service into an existing Java-based platform.
Worked with REST APIs and Spring Boot to expose reporting capabilities across tenants.

Software Developer - Java Consultant

April 2018 - April 2022

DBAccess

Developed and maintained Java enterprise applications for multiple client projects.
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

January 2018 - April 2018

Legendsoft · Miranda, Venezuela

Developed business applications using .NET MVC 5 (C#).
Built MVC web interfaces and integrated SQL Server backend data layers.

Software Developer

July 2016 - December 2017

IQuantics Corp

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