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Lizer Saiz

@lizersaiz

Java Spring Boot microservices developer at Babel, improving Oracle query performance by up to 90% on a banking KYC platform.

Spain

Message

What I'm looking for

I'm open to remote opportunities.

At Babel, I develop Java 21 microservices for a banking KYC platform that supports customer identity verification and regulatory compliance. I work with Spring Boot, DDD, and Hexagonal Architecture across five services in a larger ecosystem.

I designed REST APIs and Kafka-based communication for distributed systems, and improved Oracle queries and indexes with performance gains of up to 90% in specific use cases. I also participated in migrating a service to OpenShift and maintain Azure CI/CD pipelines.

Previously, at Capgemini and intelygenz, I worked on microservices for contracting, payment, logistics, and retail platforms. My experience includes Java backend development, automated testing, production monitoring with Grafana and Prometheus, and an AWS Certified Cloud Practitioner credential.

Experience

Work history, roles, and key accomplishments

Current

Java Spring Boot Microservices Developer

Current

Babel

Mar 2025 - Present (1 year 7 months)

- Backend development for a banking KYC platform responsible for customer identity verification and regulatory compliance.
- Ownership of 5 Java 21 microservices within a 25+ microservice ecosystem built with Spring Boot, DDD and Hexagonal Architecture.
- Participated in the migration of a microservice from Red Hat Linux infrastructure to OpenShift-based containers, including architectural refacto

Java Spring Boot Microservices Developer

Capgemini

Dec 2024 - Feb 2025 (2 months)

- Developed and maintained Spring Boot microservices within a 10+ service ecosystem supporting contracting and payment workflows for a global security company.
- Kafka integration, testing and maintenance.
- Collaborated with a large cross-functional team to deliver new features and maintain critical business services.

Java Spring Boot Microservices Developer

intelygenz

Jan 2022 - Jun 2024 (2 years 5 months)

- Started owning 2 microservices and progressively assumed responsibility for 5 services within a large logistics and retail platform supporting thousands of daily shipment operations.
- Developed backend functionality using Java microservices, REST/gRPC communication and Kafka-based event-driven integrations.
- Worked with MongoDB and Redis for data storage and caching in distributed systems.
- S

Developer Analyst

everis

Aug 2021 - Dec 2021 (4 months)

- Backend development and maintenance of legacy Java applications for insurance and energy clients, integrating SOAP and REST services.
- Worked with MySQL and Hibernate for data persistence and application maintenance.

Backend Developer

Accenture España

May 2021 - Aug 2021 (3 months)

Ingeniero de producción

MDS International

Mar 2019 - Mar 2020 (1 year)

Worked as Ingeniero de producción at MDS International.

Education

Degrees, certifications, and relevant coursework

Amazon Web Services (AWS)

AWS Certified Cloud Practitioner

May 2024 · Expires May 2027

Salesianos Zaragoza

CFGS, Mecanical Fabrication Scheduler Vocational Training EQF5

2017 - 2019

Fabrication process execution
Machining, shaping and assembly processes
Machining by Computer Numerical Control
Quality, workplace safety and enviroment protection management.
AutoCAD design (2D, 3D)
Foreign language in a work enviroment. English
Automatic systems in mechanical fabrication scheduling
Production scheduling
End product control and verification

Colegio Montessori

Multi Platform Software Developer Vocational Training EFQ5, IT

2010 - 2012

Desktop software developing with Visual Basic.NET (C, C++)
Web developing with Visual Basic.NET on framework ASP.NET (HTML, CSS, Javascript)
Database developing with MySQL
Mobile software developer with Android
Interface developing with JAVA (link with MySQL)
Video game programming with Python
Web developer with HTML5, javascript y estilos CSS3
Computer systems and networks basic concepts
Corporat