Backend Tech Lead · Luxembourg / France

Ronald Baby González

Backend Tech Lead & Senior Software Engineer

Fifteen years building and leading the delivery of resilient enterprise systems in Java and Spring Boot. I own technical design, code quality and implementation across microservice platforms — and bring AI-enhanced engineering into the team's daily practice in a measured, dependable way.

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  • 0Years delivering
  • 0Enterprise sectors
  • 0Working languages

01 — Profile

A senior backend leader who owns design, quality and delivery.

I am a Backend Tech Lead and Senior Software Engineer with over fifteen years implementing scalable enterprise solutions. My work sits at the intersection of technical design, implementation leadership and code-quality ownership — translating architecture intent into stable, performant backend systems that teams can keep evolving.

I lead by example inside the codebase: defining technical specifications, validating merge requests, guarding SOLID and clean-code standards, and mentoring engineers so that quality is shared rather than inspected in. I collaborate closely with architecture teams to keep solutions consistent, and I support modernization without losing the stability the business depends on.

I work fluently across three languages and multicultural teams, and I treat AI-enhanced engineering as a practical capability — one more disciplined tool for accelerating delivery, documentation and onboarding.

  • Technical design capability

    Designing backend solutions and integration in step with the architecture team.

  • Implementation leadership

    Steering how designs become reliable Java 21 / Spring Boot 3.5 systems.

  • Code-quality ownership

    Code reviews, merge-request validation, SOLID and Sonar quality gates.

  • Team guidance & delivery

    Mentoring, technical documentation and dependable delivery coordination.

02 — Expertise

Where I add the most value.

Backend Design

Robust service and domain design, integration boundaries, and performance-aware solutions developed in collaboration with architecture teams.

Java & Spring Ecosystem

Deep, current command of Java 21, Spring Boot 3.5, Hibernate/JPA, Spring Batch and the broader JVM delivery toolchain.

Microservices & Integration

Service decomposition and reliable communication over REST, SOAP and gRPC, with Flyway-managed schemas and Oracle at the core.

Technical Leadership

Implementation leadership across teams: technical specifications, design consistency, and clear communication to non-technical stakeholders.

Delivery, Quality & Team Organization

Code reviews, merge-request validation, SOLID and Sonar quality gates, Agile/Scrum coordination and dependable delivery.

AI-Enhanced Engineering

Pragmatic use of LLM tooling and prompt engineering to accelerate development, documentation and knowledge transfer.

Capability distribution across core competencies.

03 — Experience

Selected experience highlights.

Impact-oriented summaries from a fifteen-year delivery record. The full record lives in the multilingual CV below.

  1. Backend Tech Lead

    Oct 2021 — Present

    SFEIR Client: Police Grand-Ducale, Luxembourg

    • Lead backend implementation and steer how designs become production systems in Java 21 and Spring Boot 3.5.
    • Collaborate with the architecture team to define and guarantee a stable, performance-aligned system architecture.
    • Own code reviews and merge-request validation, enforcing SOLID principles and Sonar quality standards.
    • Author detailed technical specifications and mentor engineers, translating complex design to non-technical stakeholders.
    Java 21Spring Boot 3.5MicroservicesgRPC / SOAPSpring BatchOracleJenkins

  2. Senior Software Engineer

    Nov 2016 — Oct 2021

    Lusis Luxembourg Project: European Parliament

    • Led the critical modernization of the e-Portal platform from AngularJS to Angular 6+, improving performance and maintainability.
    • Applied design patterns and Clean Code to refactor Java EE / Spring / Hibernate modules for long-term sustainability.
    • Reviewed and validated critical code before integration, safeguarding quality across the delivery pipeline.
    • Orchestrated integration across systems via SOAP (Axis2) and REST APIs handling complex data exchange.
    AngularJava 17 / Java EESpringHibernateSOAP · RESTJenkins

  3. Full-Stack Engineer

    2014 — 2016

    Velogica Europe & Hello World Solutions Spain

    • Designed automated testing frameworks (Selenium WebDriver + Java), reducing manual testing effort by ~40%.
    • Built end-to-end Java EE applications and set up CI/CD pipelines (Hudson, Git), increasing deployment frequency.
    • Maintained and tuned life-insurance systems, optimizing SQL and safeguarding technical consistency.
    Java EESpring · HibernateSeleniumCI/CDSQL tuning

  4. Technical Lead

    2011 — 2013

    ABUC Media Network

    • Led end-to-end development of custom web applications for the tourism sector, from requirement gathering to deployment.
    • Optimized complex MySQL queries and database schemas, significantly improving data retrieval speeds for high-traffic booking modules.
    • Managed a team of 3 developers, conducting code reviews and enforcing MVC patterns to ensure code quality and scalability.
    PHPMySQLJavaScriptTeam leadership

  5. Junior Software Architect

    2009 — 2011

    Universidad de Ciencias Informáticas

    • Designed the modular architecture for a real-time video streaming platform based on VLCj, defining component interactions and data flow.
    • Produced comprehensive UML diagrams (Sequence, Class, Component) and technical blueprints to guide the development team.
    • Evaluated and implemented streaming protocols (RTSP/RTP) to optimize video latency and playback quality.
    JavaVLCjUMLDesign PatternsRTSP/RTP

04 — AI-Enhanced Engineering

AI as engineering discipline, not hype.

I treat modern AI tooling as a practical multiplier on top of strong fundamentals — adopted deliberately, evaluated honestly, and kept inside the team's quality standards.

AI-assisted software development

Using LLM-based assistants to accelerate implementation, refactoring and review preparation — always held to the same quality gates as any other code.

LLM tools in developer workflows

Integrating assistants into the day-to-day loop: code understanding, test scaffolding, and faster onboarding into complex enterprise codebases.

Prompt engineering for technical productivity

Designing reliable, repeatable prompts for engineering tasks so AI output is consistent, verifiable and safe to build on.

Evaluation of AI tools for teams

Assessing tools pragmatically — security, accuracy, fit and cost — before recommending where they belong in a delivery process.

GenAI-assisted prototyping & knowledge acceleration

Using generative AI to prototype quickly and to accelerate technical documentation and knowledge transfer across the team.

AI sits beside core practice — connected to code, review, docs, tests and delivery.

05 — Technology

A delivery-focused stack.

Backend

  • Java 21
  • Spring Boot 3.5
  • Microservices
  • Hibernate / JPA
  • REST · SOAP · gRPC
  • Spring Batch

Frontend

  • Angular
  • TypeScript
  • HTML5 / CSS3
  • jQuery

DevOps / CI-CD

  • Docker
  • Kubernetes
  • Jenkins
  • Git / GitLab
  • Jira
  • SonarQube

Data / Databases

  • Oracle
  • MySQL
  • MongoDB
  • Redis
  • Flyway

Messaging / Integration

  • Kafka
  • RabbitMQ
  • SOAP (Axis2)
  • OpenAPI
  • SoapUI

AI / Productivity

  • LLM coding assistants
  • Prompt engineering
  • GenAI prototyping
  • Tool evaluation

06 — Publications, Projects & References

Selected work & client references.

Publication

Cluster / VODKA integration

Technical work on the integration of clustered services with the VODKA platform — focused on reliable system communication and operational stability.

Project

Media cataloguing system

Design and delivery of a media cataloguing system, organizing large media collections with maintainable backend services and clean data modelling.

Reference clients

Public & institutional systems

  • Police Grand-Ducale — backend tech leadership (via SFEIR)
  • European Parliament — platform modernization (via Lusis)

Delivering mission-critical systems for demanding public-sector institutions.

07 — Reference Clients

Clients & organizations.

Selected organizations and institutions associated with recent professional experience — across public-sector, European and enterprise environments.

08 — Résumé

Multilingual CV center.

Read the full résumé in-page, switch language, or download the original PDF. Everything below is generated from one source so all three languages stay in sync.

Language: English Download PDF

09 — Personal Lab

Personal lab & services.

A small, self-hosted environment I run to stay close to infrastructure, storage and media tooling. Curated, mostly private, and entirely secondary to the professional profile.

  • Available

    DSM

    Synology DiskStation manager — the control plane for the home lab.

    Open
  • Available

    Notes

    Self-hosted notes for technical writing and knowledge capture.

    Open
  • Private

    Drive

    Private file storage and sync. Access is restricted to invited accounts.

    Request access
  • Private

    Photos

    Personal photo library. Available to invited accounts only.

    Request access
  • Offline

    Plex

    Media server. Brought online on demand to manage power and bandwidth.

    Check status

10 — Contact

Let's talk delivery, design and leadership.

Open to senior backend leadership, technical design collaboration and consulting conversations. The fastest way to reach me is email or LinkedIn.

Email me LinkedIn GitHub