Manuel Chica Piñera

I am a fullstack developer: backend with Java / Spring Boot and C# / .NET, frontend with React and Vue.js. I have professional experience on enterprise applications in production, applying regulations and digital document signing with X509 certificates. I am interested in REST API design, microservices and CI/CD.

1. Jun 2025 – Jul 2025Internship · Remote

   Software developer · Vertebra Gestión

   • Backend features in C#/.NET on SQL Server for a business management application in production.
   • Digital signatures and document generation with X509 certificates (FacturaE standard).
   • Work in a multi-person team with Git and code reviews, delivering assigned tasks on time.

1. 01

   Lacre

   Solo

   Code · Lacre (opens in a new tab)5stars1forks

   Open-source Veri*Factu invoicing component.

   Open-source component for issuing invoices that comply with the Spanish Tax Agency’s Veri*Factu system.

   • Java
   • ·Spring Boot
   • ·PostgreSQL
   • ·Thymeleaf
   • ·Docker
   • ·GitHub Actions
   • ·JUnit 5
   • ·Testcontainers
   • ·ArchUnit
   • ·jqwik
   • ·WireMock
   • ·PIT

2. 02

   GaiaTool

   Bachelor's thesis · grade 10/10

   Code · GaiaTool (opens in a new tab)

   AI-powered sustainability report generator following the EU CSRD.

   Bachelor’s thesis: a tool that generates sustainability reports with artificial intelligence following the EU CSRD directive.

   • JavaScript
   • ·OpenAI
   • ·Vue.js

3. 03

   SegundUM

   Team

   Code · SegundUM (opens in a new tab)

   Second-hand marketplace platform.

   Second-hand marketplace built as a team, with Spring Boot and .NET services communicating over REST and RabbitMQ, OAuth 2.0 authentication with JWT and a React client.

   • Spring Boot
   • ·.NET
   • ·REST
   • ·RabbitMQ
   • ·MySQL
   • ·MongoDB
   • ·Docker
   • ·OAuth 2.0
   • ·JWT
   • ·JavaScript
   • ·React
   • ·Bootstrap

4. 04

   Personal Data Hub

   Solo

   Aggregates the GitHub, Strava and Steam APIs into a single dashboard.

   Spring Boot service that brings together data from the GitHub, Strava and Steam APIs into a single dashboard, with PostgreSQL and Docker.

   • Spring Boot
   • ·REST
   • ·PostgreSQL
   • ·Docker

5. 05

   OBD-Map

   Solo

   Code · OBD-Map (opens in a new tab)

   Android GPS navigator connected to OBD-II scanners over Bluetooth.

   Android GPS navigation app, with Mapsforge maps and GraphHopper routing, that connects to the vehicle’s OBD-II scanners over Bluetooth.

   • Android
   • ·Java
   • ·Bluetooth
   • ·Mapsforge
   • ·GraphHopper

Other projects

• AppChat

  Messaging application in Java.

• NanoFiles

  Peer-to-peer file sharing system in Java.

• Dig-a-Mole

  Language learning application in Java.

• Mini-C

  Compiler for a subset of C.

• Linux services

  HTTP/HTTPS, DNS and WebMail administration on Linux.

Data from Nov 4, 2026View GitHub profile (opens in a new tab)

Send me an email or find me online.

hola@manuelchica.dev

• GitHub (opens in a new tab)
• LinkedIn (opens in a new tab)

Murcia, Spain