Renny Valera

Service Integration Lead (Full-time) — Telefónica, 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 AS/400 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 · AS/400 · 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 AS/400 using SSIS.
• Built Reporting Services reports from SQL Server data.

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.