About

Backend and smart contract engineering grounded in real-world systems.

I am a Senior Backend & Smart Contract Engineer based in Valencia, Spain. I build production-oriented backend systems, signed-intent protocols, and Web3 integrations using Java/Spring Boot, TypeScript/Node.js, PostgreSQL, Keycloak, OpenAPI, Solidity/EVM, Foundry, and DeFi primitives.

Real-world systems thinking

Before moving deeper into backend and blockchain engineering, I worked for years in industrial automation, where reliability, actors, timing, failure modes, and operational constraints matter.

I now apply that same mindset to APIs, smart contracts, workflow systems, identity boundaries, and blockchain integrations: permissions, deadlines, state transitions, auditability, integrations, and failure paths.

Professional profile

15+ yearsengineering background

4+ yearsbackend, full-stack & Web3 focus

ValenciaSpain

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Current technical focus

Systems where state, identity, and reliability are explicit.

Production JVM services with Java 17/Kotlin, Spring Boot, PostgreSQL, REST/OpenAPI, Docker, and GitLab CI/CD

Distributed workflows with JMS/Apache ActiveMQ Artemis, retries, idempotency, scheduled processing, and operational traceability

Identity and access management with Keycloak, OAuth 2.0, OIDC, JWT, external identity providers, and organization-aware authorization

Smart-contract and DeFi engineering with Solidity, Foundry, protocol integrations, fuzzing, stateful invariants, and explicit security boundaries

What I bring

Production engineering across multiple system layers.

Production backend systems

Java 17/Kotlin, Spring Boot, REST/OpenAPI, PostgreSQL, distributed workflows, authentication, and CI/CD for business-critical services.

Identity & security engineering

Keycloak, OAuth 2.0, OIDC, JWT, federation, organization-aware authorization, role/claim synchronization, and security-sensitive state transitions.

Smart contracts & protocols

Solidity/EVM, Foundry, DeFi integrations, signed-intent protocols, access control, fuzzing, stateful invariants, and explicit threat boundaries.

Reliability-first ownership

Industrial automation discipline applied to software: model state clearly, design failure paths, automate validation, investigate production evidence, and ship durable fixes.

Engineering background

From industrial automation to production software.

Automation work across automotive and production environments shaped a practical approach to system boundaries, state transitions, operational safety, maintainability, and root-cause debugging.

Jul 2023 - Present

A3M Global Monitoring GmbH

Senior Backend / Full-Stack Engineer

Build and maintain production Java 17/Kotlin and Spring Boot 3 services, secure REST/OpenAPI contracts, PostgreSQL models, and administration systems for business-critical monitoring and identity products.
Design distributed integration workflows across REST, JMS, and Apache ActiveMQ Artemis with retries, scheduled processing, explicit intermediate states, idempotency, ordering-sensitive behavior, and operational traceability.
Engineer security-sensitive IAM capabilities with Keycloak, OAuth 2.0/OIDC/JWT, external identity providers, organization-aware provisioning, claim and role synchronization, token policies, and custom authentication/authorization behavior.
Own changes end to end: requirements clarification, architecture, implementation, migrations, automated testing, code review, GitLab CI/CD, Docker delivery, rollout, production troubleshooting, root-cause analysis, and durable fixes.

Aug 2022 - Dec 2024

defdone / BlockBites

Full-Stack & Web3 Developer

Delivered React/TypeScript and Node.js product features, backend APIs, data integrations, wallet connections, smart-contract interactions, transaction workflows, KYC/user verification, and third-party service integrations.
Contributed to Casper ecosystem products including a multi-source ecosystem platform and Fondant, a Docker/CCTL-based local blockchain developer environment with deploy inspection, RPC access, logs, and developer tooling.
Worked across frontend, backend, and blockchain boundaries with emphasis on secure authorization, observable transaction states, validation, documented APIs, automated delivery, and maintainable user workflows.

2014 - Jun 2023

Automotive manufacturing - Ford, Gestamp, SEAT and others

Software & Automation Engineer

Programmed, commissioned, debugged, and supported production-critical automation in international manufacturing environments where uptime, deterministic behavior, safety, and controlled recovery were non-negotiable.
Applied process modeling, state-machine thinking, root-cause analysis, cross-functional coordination, and evidence-driven troubleshooting - habits that now shape backend and protocol engineering decisions.

Best-fit technical areas

Where this background creates the most value.

GitHub / public profile

Contribution rhythm

Education

Master in Blockchain Development

Advanced smart-contract, DeFi, protocol, and blockchain engineering program

Blockchain Accelerator

Full Stack Developer

Full-stack software development program

OpenBootcamp

Industrial Automation & Industrial Electronics Engineering

Engineering degree

Universitat Politecnica de Valencia (UPV)

Technical Industrial Engineer - Industrial Electronics