Cristian Chozas Díaz

Backend Developer specialized in Java 17 and Spring Boot, focused on building scalable REST APIs with clean architecture and rigorous testing.

WHAT I BRING TO YOUR PROJECT

• Production-ready REST APIs with Spring Boot 3.x

• JWT authentication and role/permission management

• Clean Architecture and SOLID principles

• Unit and integration testing (JUnit 5, Mockito, >80% coverage)

• PostgreSQL + Spring Data JPA with optimized queries

• Dockerization and CI/CD with GitHub Actions

REAL-WORLD PRODUCTION EXPERIENCE

I worked at Novayira OÜ (Estonian startup) developing the backend for an international B2B marketplace:

- Node.js/Express + PostgreSQL in production

- Multi-role JWT system with permission validation

- Testing with Jest to ensure code quality

- Collaboration in a distributed team with agile methodologies

Currently finishing DAW (average grade >9) and a Master's in AI Development, applying best practices from design to deployment.

HIGHLIGHTED PROJECTS

CryptoFolio(Java 17 + Spring Boot)

→ API for crypto transaction tracking with Clean Architecture

→ Live deploy: cryptofolio-production.up.railway.app

→ Rigorous testing + CI/CD + OpenAPI documentation

Loadix(In development - Java/Spring Boot)

→ B2B logistics optimization platform

→ Stripe integration via webhooks

→ My background in transport/logistics is a differentiator in this niche

AVAILABILITY

• 100% Remote from Madrid

• Immediate availability

• Timezone: CET (UTC+1)

• Native Spanish | English B2 (fluent technical documentation)

DIFFERENTIATORS

✓ Verifiable public code on GitHub

✓ Projects with live deployment (not just dead code)

✓ Knowledge of the logistics/transport sector for B2B projects

✓ Testing as an essential part of development, not optional

I am looking for projects where I can apply backend engineering best practices and continue to grow technically in teams that value code quality.