Freelancer profile translated to English.

Description

Software Architect / Senior Backend (Java & Kotlin)

+10 years building and modernizing platforms in Public Administration and banking.

Developing microservices with Java 17/Kotlin + Spring Boot 3, Cloud-Native focus, Hexagonal Architecture, DDD, Testing (TDD/BDD), SOLID.

DevOps (CI/CD, Docker, OpenShift, Helm, Harbor).

I bring technical leadership, mentoring, and governance of best practices to ensure end-to-end quality, traceability, and scalability.

Frontend

HTML5, CSS3, Bootstrap, JavaScript, jQuery, React

Cross-Platform

Kotlin (Android: mobile, tablet, TV)

Backend & Frameworks

Java (1.4/6/7/8/11/17), Spring (Core, Batch, Security, REST), Spring Boot (microservices)
Hibernate / JPA, EJB, Struts, JSF (RichFaces, PrimeFaces, OmniFaces)

Architectures & Practices

Hexagonal Architecture, DDD, SOA, SOLID, design patterns, best practices

APIs & Integration

REST (JAX-RS, Jersey) and SOAP (Axis): design, implementation, and consumption
OpenAPI/Swagger, API versioning, hardening, and observability

Security & Cryptography

Certificates, keystores, signing, and encryption (client/server)
SAML2, OAuth2, JWT, WS-Security; integration with Cl@ve and WSO2

Data & Persistence

Hibernate/JPA; (mainly) Oracle, MariaDB/PostgreSQL, MongoDB, Sybase

Reporting & ECM

JasperReports, Crystal Reports; integration with Documentum

CI/CD, DevOps & Quality

Maven, Gradle; Jenkins, SonarQube, Git/GitHub
Docker, Kubernetes/OpenShift, Helm, Harbor (deployment and orchestration)

Testing

JUnit, JMeter (unit and load), SoapUI, Postman (integration)

Industry field of expertise

Languages

Spanish
Native or bilingual
English
Fluent

Workplace preferences

Can work on-site

Madrid (up to 15km)

INNUSUAL S.L
JAVA BACKEND ARCHITECT / TECH LEAD
BANKING AND INSURANCE
November 2024 - Today (1 year and 7 months)
Madrid, Spain
Java Backend Architect – Microservices & DevOps
Implementation of microservices in Java 17 with Spring Boot 3.x.
Management of Swagger/OpenAPI for API design and documentation.
Management of images in Harbor and deployments in OpenShift.
Optimization of Dockerfiles and Helm Charts for orchestration and releases per environment.
Technical support and guidance for developers (reviews, troubleshooting).
Gathering functional/technical requirements for ICCREA processes: “Balance Reception”, “Transfer Confirmations”, and “Finalize Orders”, ensuring integration with FLASH, SYFE, and Agent Banking.
Automation with Bash: creation, optimization, and debugging of scripts for processing flows (balance reception, transfer confirmations, order closing).
Development of stored procedures in Sybase (T-SQL) for processing migrated data.
Spring boot JPA/Hibernate REST API OpenShift Docker
AYUNTAMIENTO DE TRES CANTOS
IT TECHNICIAN (CIVIL SERVANT)
PUBLIC SECTOR
April 2024 - November 2024 (7 months)
Tres Cantos, Spain
Java Developer / SysAdmin & Automation
Development of applications and automation of processes for tax management and parking authorization, from analysis to production deployment (APIs, back office, and business flows).
PowerShell scripting: automation of recurring tasks (provisioning, diagnostics, backups, deployments), reducing operational times and manual errors.
Windows 10/11 administration and fleet management: policies, inventory, basic hardening, and preventive maintenance.
Technical support (Helpdesk) L1/L2: diagnosis and resolution of incidents in IT and audiovisual systems, focusing on service continuity and SLA compliance.
LAN/WAN Networks (TCP/IP): configuration and operation of VLANs and layer 2/3; IP/VoIP Telephony platform administration.
Operation and deployment: Docker/Portainer containers, Apache/Tomcat publishing, documentation, and knowledge transfer.
Java REST API JPA/Hibernate Docker HelpDesk
INETUM / AYESA A.T
JAVA ARCHITECT / TECH LEAD
PUBLIC SECTOR
June 2017 - April 2024 (6 years and 10 months)
Madrid, Spain
Architect / Tech Lead Java – Corporate Frameworks (Madrid Digital)
Evolution, maintenance, and L3 support of corporate frameworks (Framework2, Atlas, and Atlantix).
Design and industrialization of new components/accelerators: definition, testing, documentation, and delivery following DevOps best practices and principles (CI/CD).
Technological research: evaluation of versions, OSS/commercial libraries, and execution of PoCs to enrich Java frameworks.
Digital identity: analysis and integration with WSO2 Identity Server (SAML, OAuth2/OIDC, JWT) and SSO in frameworks.
Security and cryptography: design, construction, and testing of modules for signing, encryption, authentication, and access control oriented towards e-Administration.
Support and technical governance: incident management for internal teams and suppliers, troubleshooting, and technological alignment.
Knowledge management and leadership: documentation, knowledge transfer, task coordination, milestone tracking, and continuous improvement proposals.
Knowledge portal: updating and curating content on frameworks, components, and Java solutions.
JavaServer Faces Spring Framework JPA/Hibernate WSO2 Webservices

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Higher Technician in Cross-Platform Application Development
I.E.S Enrique Tierno Galván
2010
Técnico Superior Desarrollo de Aplicaciones Multiplataforma
ITIL® Foundation Certificate
PeopleCert- AYESA
2019
ITIL® Foundation Certificate

Check out Javier's education

Javier D.

JAVA BACKEND ARCHITECT / TECH LEAD

About Javier

Software Architect / Senior Backend (Java & Kotlin)

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