Renny Valera

API Integration & Security Architect · Senior Backend (Java / Quarkus / OpenShift)

valerarenny@gmail.com · Caracas, Venezuela · https://linkedin.com/in/rennyvalera · https://github.com/valerarenny

Professional Summary

Software engineer with 10 years of experience in backend development, enterprise integration, and API security. Specialized in the Red Hat ecosystem: Quarkus, OpenShift, 3scale API Management, Keycloak, and AMQ Streams. Currently leading the migration of Telefónica's service ecosystem to a centralized API Gateway with 3scale, including the design of a BFF architecture with backend-managed sessions and effective token revocation, aligned with the OAuth 2.0 for Browser-Based Applications best practice. Experience across telecommunications, the public sector (provincial budget systems), insurance, and hospitality, with integrations to legacy AS400 systems. C1 English.

Technical Skills

Professional Experience

Service Integration Lead (Full-time) — Telefonica, Venezuela

September 2023 - Present

  • Leading the migration of the API and microservices ecosystem to a centralized API Gateway with Red Hat 3scale, unifying traffic policies, rate limiting, and monitoring across consumer applications (mobile, web, internal channels, and partners).
  • Designed and implemented a BFF architecture with backend-managed sessions that removes token storage from the browser and enables effective session revocation — cutting the time between logout and real access invalidation from the token's full lifetime to under a second, closing a security finding around ineffective logout on stateless JWTs.
  • Defined the authentication and authorization model on Keycloak (OAuth2 / OIDC): per-client-type flows, realm and client management, and token validation at the gateway.
  • Implemented distributed session management with Redis to support authentication at scale with low latency.
  • Established CI/CD pipelines with Tekton and Azure DevOps, streamlining build, test, and deployment cycles and increasing release frequency.
  • Implemented asynchronous inter-service communication with Apache Kafka to decouple critical business flows.
  • Provided technical coordination for the development team and served as the integration point of reference for product teams.

Stack: Java · Quarkus · Spring Boot · 3scale · Keycloak · OpenShift · Kafka · Redis · Docker · Prometheus / Grafana

Java Consultant · Freelance (Project-based contract) — DirMOD, Argentina

September 2022 - December 2023

Independent project-based collaboration, not an employment relationship. After joining Telefónica full-time in September 2023, I continued through project close only, in parallel with and without conflict to my full-time role.

  • Developed the budget line-item management module for the Government of the Province of Misiones, a public budget administration system distributed across multiple government agencies.
  • Modeled the budget execution domain (line items, allocations, encumbrances, and balance control) applying DDD, ensuring traceability and consistency across financial operations.
  • Built event-driven microservices with Spring Boot and Apache Kafka to support internal workflows of the budget execution system.
  • Implemented API security with JWT/OAuth2 and distributed persistence over PostgreSQL and MongoDB.
  • Contributed to containerization and deployment with Docker and Kubernetes.

Stack: Java · Spring Boot · Kafka · PostgreSQL · MongoDB · Docker · Kubernetes

Software Engineer — Zutun, Lima, Peru

April 2022 - August 2022

  • Integrated the reporting module for Insuma, a multi-tenant insurance platform, exposing reporting capabilities with data isolation across tenants.
  • Developed REST endpoints on Spring Boot for report generation, optimizing report-generation times.

Stack: Java · Spring Boot · REST

Software Developer - Java Consultant — DBAccess / Paxer

April 2018 - April 2022

  • Developed and maintained Paxer, a hotel Property Management System (PHP/Java) in production, working across the full stack.
  • Built Spring Boot microservices integrated with AS400 systems via sockets and message queues.
  • Used Apache Kafka and ActiveMQ for asynchronous messaging and event-driven booking and billing 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.

Stack: Java · Spring Boot · Kafka · ActiveMQ · AS400 · PostgreSQL · MySQL · SQL Server · MongoDB · Docker

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