migue User
@migueuser
Senior Java backend developer building secure, scalable microservices with TDD and DDD.
What I'm looking for
I’m a Java Backend Developer with 8+ years building scalable, production-ready microservices and distributed systems across healthcare, fintech, insurtech, and SaaS. I specialize in Spring Boot 3 and Java 17/21, focusing on high-availability service design and robust domain modeling.
I’m a strong advocate of Test-Driven Development, Domain-Driven Design, Clean Architecture, and SOLID principles. Across teams, I’ve introduced testing practices and established code-quality standards (e.g., Checkstyle) to improve consistency, reviewability, and release confidence.
Recently, as a Senior Backend Developer, I design Java 21 / Spring Boot 3 microservices with DDD and Hexagonal Architecture, including secure OAuth2 flows with PKCE and auditable orchestration using Spring State Machine. I also lead database migration improvements with Liquibase and evaluate modern Java concurrency patterns (Virtual Threads / Project Loom) for adoption.
Experience
Work history, roles, and key accomplishments
Designed and implemented Java 21/Spring Boot 3 microservices using Domain-Driven Design and Hexagonal Architecture with a focus on secure access and reliable service orchestration. Established team code-quality standards and introduced Liquibase for versioned database migrations.
Java Developer
FluxIT
Sep 2024 - Aug 2025 (11 months)
Performed Java R&D evaluating Java 21 features and modern concurrency patterns for adoption in client projects. Benchmarked virtual threads (Project Loom) with Spring Boot 3 using JMeter under high concurrency and produced technical write-ups.
Built HIPAA-compliant healthcare microservices in an Agile/Scrum environment using Clean Architecture and Domain-Driven Design. Implemented attribute-based authorization in Spring Security and integrated FHIR and SmileCDR for healthcare interoperability.
Java Developer
Iunigo
Apr 2021 - Jun 2022 (1 year 2 months)
Developed insurance products end-to-end using TDD, Domain-Driven Design, and Agile practices. Co-designed and built MVC products, spearheaded TDD adoption to improve release confidence, and built an internal Java library wrapping Amazon S3 capabilities.
Contributed to an infrastructure migration of the Lighthouse Enterprise platform from Web.com to Internet Brands. Worked on networking and microservices integration and extended the service layer with Node.js modules.
Developed features and performance improvements for StartMeUp, Globant’s internal private social network. Integrated JaCoCo into the build pipeline for code coverage tracking and enforced Sun/Oracle code conventions for consistency and quality.
Java Developer
Pyramidal
Sep 2017 - Jul 2018 (10 months)
Built billing and collections modules for a financial-services client, including reporting used by internal finance teams. Identified SQL Server bottlenecks from batch workloads and refactored processing into off-hours scheduled tasks using stored procedures and database snapshots.
Education
Degrees, certifications, and relevant coursework
Universidad Tecnológica Nacional (UTN)
Computer Programming Technician, Computer Programming
Grade: 18/20 subjects completed
Computer Programming Technician program; completed 18 of 20 subjects.
Cisco
Cisco CCNA (CCNA 1–3), Networking
Completed Cisco CCNA 1, CCNA 2, and CCNA 3 certifications.
Availability
Location
Authorized to work in
Portfolio
medium.com/@mikemaza9Job categories
Skills
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