About Javier
Senior software engineer with 12+ years of experience in backend development, enterprise integration and distributed systems, working on complex large-scale environments across telecommunications and consulting.
Strong background in Java and enterprise backend systems, with additional experience using Python and FastAPI for APIs, automation and internal tooling.
Experienced in:
- Java / Spring Boot
- Python / FastAPI
- REST APIs
- asynchronous messaging
- event-driven architectures
- workflow/BPM integration
- microservices
- enterprise system integration
- legacy modernization
Used to working on systems where reliability, scalability and long-term maintainability are critical.
I typically collaborate on clearly scoped projects or part-time engagements, especially backend-heavy initiatives involving integrations, APIs, automation or distributed systems.
Spanish
Native or bilingual
English
Fluent
Italian
Basic
Basque
Basic
Remote only
Primarily works remotely
Experience
- TelefonicaSenior Software EngineerTELECOMMUNICATIONSMarch 2019 - Today (7 years and 4 months)Bilbao, SpainExpert in complex, proprietary systems at Telefónica, dedicated to the deployment and maintenance of the telecommunications network. Experience in robust system development, project oversight, and ensuring operational reliability for large-scale network infrastructure.
- TelefonicaSoftware Engineer & Team LeadTELECOMMUNICATIONSJuly 2014 - February 2019 (4 years and 7 months)Madrid, SpainDesigned and developed backend services and enterprise integrations for telecommunications systems using Java and Spring technologies.Led development initiatives involving service design, system integration and proof-of-concept development in complex enterprise environments.Worked with:- Java- Spring- JPA- SOAP services- enterprise service integration- UML/service modeling
- TelefonicaMiddleware EngineerTELECOMMUNICATIONSJuly 2013 - July 2014 (1 year)Madrid, SpainDesigned and developed middleware architecture using Oracle SOA Suite and BPEL.Oracle Service Bus integration with legacy Systems. Technologies: Oracle SOA Suite, BPEL, Web Services
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Education
- Ingeniero InformáticoUniversidad de Oviedo2009Computer science master
- Ingeniero Técnico Informático de SistemasUniversidad de Oviedo2004Computer science bachelor