Hi, I'm Rafel
Java Software Engineer specialized in backend and cloud
platforms
My Resume
Portfolio
Most recent projects
All
Full Stack
Back-End
Blockchain
Game_dev
UX/UI
Esoterika
GitHub
Demo
Esoterika
Virtual AI Encyclopedia on Esotericism
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Full Stack development with React.js for dynamic UI.
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Backend powered by Node.js & Express.js.
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MongoDB database for scalable knowledge storage.
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AI integration using OpenAI API for smart responses.
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RESTful API architecture for smooth data exchange.
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Responsive UI/UX design for web & mobile devices.
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Deployed on Docker & AWS for performance and scalability.
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Continuous integration with GitHub Actions.
PNYX
GitHub
Demo
PNYX
Secure Blockchain-Based Voting Software
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Full Stack development with Angular for a dynamic and
responsive frontend.
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Backend powered by Java & Spring Boot, delivering
robustness and scalability.
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Secure RESTful APIs to handle voting workflows with
encrypted data exchange.
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Relational Database (PostgreSQL/MySQL) for structured
storage and auditable election data.
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Integration with Cardano Blockchain to guarantee vote
traceability, immutability, and transparency.
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Admin Web Dashboard for real-time election configuration,
monitoring, and result analysis.
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Voter-facing Web Application with seamless, user-friendly
participation.
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Mobile App (Android/iOS) for secure remote voting anytime,
anywhere.
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Strong authentication with JWT & OAuth 2.0, ensuring only
eligible users cast votes.
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End-to-End Encryption for ballot security and voter
privacy.
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Deployed using Docker & Kubernetes for scalable,
fault-tolerant infrastructure.
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Continuous Integration/Deployment pipelines with
Jenkins/GitHub Actions.
VanDer
GitHub
Demo
Vander
Caravan Rental Management System
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Full Stack development with Angular for a responsive and
modern frontend.
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Backend powered by Java & Spring Boot, ensuring stability
and high performance.
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Secure RESTful APIs to manage reservations, payments, and
user interactions.
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Relational Database (PostgreSQL/MySQL) for structured
storage of rentals, customers, and fleet data.
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Admin Web Dashboard to manage caravans, track
availability, and monitor bookings.
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Customer-facing Web Application for browsing caravans,
making reservations, and handling payments.
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Mobile App (Android/iOS) for booking and managing rentals
on the go.
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Integrated JWT & OAuth 2.0 authentication for secure user
and admin access.
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End-to-End Encryption to protect sensitive booking and
payment data.
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Deployment with Docker & Kubernetes for scalable and
reliable infrastructure.
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Continuous Integration/Deployment pipelines with
Jenkins/GitHub Actions.
Versa
GitHub
Demo
Versa
AI-Powered Article Summarizer
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Web application that transforms long articles into concise
summaries using OpenAI API.
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Users can paste or submit full texts and receive
digestible, readable summaries.
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Customizable summary options (length, detail level,
focus).
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Lightweight frontend using JavaScript / TypeScript, CSS &
HTML — clean and minimal.
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Backend / API orchestration handles requests and forwards
to summarization service.
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Asynchronous request handling to process large texts
without UI blocking.
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Input validation and error handling to ensure stability
and robustness.
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Deployable on static hosting platforms (Vercel, Netlify)
or any web server.
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Open source under MIT License — freely adaptable and
extensible.
Molecule
GitHub
Demo
Ui/Ux
Designer
-
I develop the user interface.
-
Web page development.
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I create ux element interactions.
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I position your company brand.
XRP
GitHub
Demo
Ui/Ux
Designer
-
I develop the user interface.
-
Web page development.
-
I create ux element interactions.
-
I position your company brand.
ASP
GitHub
Demo
Ui/Ux
Designer
-
I develop the user interface.
-
Web page development.
-
I create ux element interactions.
-
I position your company brand.
Centered
Case Study
Centered
A personalized journey to a balanced state of mind
SoundFind
GitHub
Demo
Ui/Ux
Designer
-
I develop the user interface.
-
Web page development.
-
I create ux element interactions.
-
I position your company brand.
About Me
My introduction
My name is Rafael Ballester Coll, I am 36 years old and have 2
years of hands-on experience in development and data management
projects. Java Software Engineer with experience in backend
development and data management. Skilled in Java, Spring Boot,
JPA/Hibernate, and REST APIs with OAuth2. Strong background in SQL
(MySQL in production, Oracle PL/SQL, SQL Server T-SQL) with
expertise in complex queries, modeling, indexes, and data
security. Experienced in Linux, Docker, Kubernetes, Git, CI/CD
pipelines, and AWS and Oracle deployments. You can learn more
about me and my hobbies in the links below.
Skills
My technical level
Java, Spring Boot, JPA/Hibernate
90%
REST APIs with OAuth2, JWT
90%
Clean Code, Design Patterns
75%
Observability & Monitoring
70%
Advanced SQL (complex queries, modeling, indexes, stored
procedures)
90%
MySQL (production), Oracle PL/SQL, SQL Server T-SQL
80%
Data Security, Backup & Recovery
80%
Performance optimization & troubleshooting
75%
Angular, React, Next.js
90%
Java, Spring Boot, PHP (MVC, CMS)
85%
UI/UX Design, Responsive Web Design
85%
Technical SEO & Performance Optimization
85%
Integration with external APIs
85%
Qualification
My personal journey
Bachelor’s degree in Computer Science
Spain - UOC
2025 - Currently
Higher Technician in Web Application Development
Spain - UOC
2022 - 2024
Bachelor’s degree in Geography, History, and Art History
Spain - UOC
2018 - 2022
Software Engineer | Java | DevOps
CGI
2025-Currently
Software Engineer | Java | DevOps
AvorisTech (Internship)
2024-2025
Social Media Tech Lead | Full Stack web Developer
Meliá Hotels International
2022-2024
Full Stack web Developer
NEWM
2022-2023
Services
What i offer
Front End
Development
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Frontend
Development
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User Interface (UI) Design.
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Build the client-side components of the website or web
app.
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Responsive Design.
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Performance Optimization optimizing code, compressing
files, and reducing page load times.
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Ensure seamless functionality between the front-end and
back-end systems.
Back End
Development
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Blockchain
Development
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Blockchain
Development
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Smart Contract Development.
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Distributed Application (DApp) Development.
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Blockchain Integration.
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Security Audits.
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Consensus Protocol Implementation.
UX/UI
Design
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UX/UI
Design
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I develop the user interface of websites and Movil apps.
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Web page development.
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I create ux element interactions.
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I position your company brand.
Graphic
Design
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Graphic
Design
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Branding and Identity Design.
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User Interface (UI) Design.
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llustration and Icon Design.
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Collaborative Projects.
Digital
Marketing
View More
Digital
Marketing
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Digital Strategy Development.
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Search Engine Optimization (SEO).
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Pay-Per-Click Advertising (PPC).
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Social Media Marketing.
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Analytics and Reporting.