Freelancer profile translated to English.

Description

Tech Lead and Backend/Full Stack with +7 years in Java + Spring Boot, specializing in microservices and hexagonal architecture (Ports & Adapters). Design clear and maintainable REST APIs (OpenAPI/Swagger) and bring solutions to production with CI/CD (Jenkins) and containers/Kubernetes. Experience in demanding environments (banking and IT consulting), with a focus on quality, security, and scalability. Available for 100% remote freelance projects.

What I do and how I add value

Technical Leadership / Team Lead: Team coordination, prioritization, code reviews, standards, day-to-day management, and direct client communication.

Solid Backend with Spring Boot: Domain design, system integration, patterns, and best practices for maintainable systems.

API Design: Contracts, versioning, documentation, and consistency (OpenAPI/Swagger).

DevOps / Delivery: CI/CD pipelines, Kubernetes deployments, continuous quality with SonarQube.

Testing and Quality: JUnit, integration tests, regression prevention, and safe refactoring.

Persistence: JPA/Hibernate, modeling, and data access optimization.

Stack

Java, Spring Boot, Microservices, Hexagonal Architecture, REST APIs, OpenAPI/Swagger, JPA/Hibernate, SQL, JUnit, SonarQube, Jenkins, Docker, Kubernetes, Git, Agile.

Industry field of expertise

Languages

Spanish
Native or bilingual
English
Conversational
Russian
Native or bilingual

Workplace preferences

Can work on-site

Sevilla (up to 50km), Madrid (up to 50km), Barcelona (up to 50km), Málaga (up to 50km)

Autónomo Freelancer
Tech Lead
August 2024 - Today (2 years)
Spain
Definition of hexagonal architecture: domain/infrastructure separation, ports/adapters, testing, and maintainability.
hiberus
Team Lead/ Architect
BANKING AND INSURANCE
May 2024 - Today (2 years and 3 months)
Seville, Spain
I lead a backend development team in the banking sector, designing scalable and resilient solutions based on Java 21, Spring Boot, and microservices architectures. I have driven the adoption of hexagonal architecture (Ports & Adapters) to promote layer separation, code maintainability, and ease of testing.

I coordinate the technical and functional planning of sprints under an Agile / Scrum approach, lead task estimation, and participate in direct communication with the client for objective tracking, dependency management, and blocker resolution.

From a technical standpoint, I ensure good engineering practices by using Swagger/OpenAPI for RESTful APIs, Jenkins and Docker for CI/CD pipelines, and Kubernetes for deployments. I ensure software quality with tools like SonarQube, JUnit, and automated integration tests. My leadership approach combines technical vision and active listening, creating productive and motivating work environments.
Hexagonal Architecture Team Leadership Java JUnit Spring boot
Santander
Java Analyst
BANKING AND INSURANCE
June 2023 - June 2024 (1 year)
Madrid, Spain
Developed backend microservices for key financial products, applying Java Spring Boot, Spring Security, and Spring Data JPA, integrated into a hexagonal architecture to decouple infrastructure components and facilitate automated testing.

Participated in the implementation and documentation of REST APIs using Swagger/OpenAPI, performing integrations with internal and external systems. Automated tests with JUnit 5, deployments using Jenkins and Kubernetes, and quality control with SonarQube.

Also contributed to defining data models, DTO-level validations, and access control policies. Worked in close collaboration with QA, architects, and business in a regulated and demanding environment. Daily tracking using tools like Jira, and cross-functional collaboration under Scrum methodology.
JUnit Java 17 OpenAPI/Swagger Spring boot Java