Available for projects
Rafael
González
Manzano
Role
Software Engineer
const rafael = {
role: "Software Engineer",
stack: ["Python", "FastAPI"],
focus: "Enterprise Systems",
location: "Seville, Spain"
};
// open to new challenges
Experience
15+
years building enterprise software
Status
Open to work
Available for freelance projects and consulting.
Currently available
Backend & full-stack
Systems Development
Infrastructure
Cloud & DevOps
Digital Signature
Security & PKI
Contact
Let's build something together
Location
Seville,
Spain 🇪🇸
Spain 🇪🇸
Remote-first. Available worldwide.
Selected projects
Products built end to end — design, backend and deployment.
★ Featured
In development · core working
VERI*FACTU-compliant invoicing engine
Spanish law (RD 1007/2023 and Order HAC/1177/2024) requires every invoicing system to make its records tamper-evident: each invoice is sealed into a chained SHA-256 fingerprint, carries a verification QR code, and is reported to the Tax Agency. I am building that engine from the regulation itself, not wrapping someone else's.
✓
✓
✓
✓
✓
Legal deadline
Companies (corporate tax)01/01/2027
Self-employed01/07/2027
Product · Live
restaurantevisible.es
Restaurante Visible
Websites for restaurants with a built-in booking engine: digital menu, real-time reservations 24/7, a manager dashboard to accept or reject bookings, and automatic email confirmations. No per-booking commissions — the restaurant owns its reservations, its customers and its data.
Live site
Platform · In production
Private
Invoicing & document platform
Generates monthly invoices as PDFs with correlative numbering and signs them with a PAdES digital signature from an encrypted certificate. Adds recurring invoicing, document management with automatic amount extraction, quarterly summaries and charts, TOTP two-factor login and scheduled backups.
Sample view — fictitious data
Web app · In production
Private club
Padel court booking
Booking system for a padel club: an interactive daily grid that refreshes on its own, fair-use rules (one booking per member per day, limited days in advance), sign-up with admin approval and password recovery. Admins configure summer and winter timetables with independent morning and afternoon sessions, and each day shows the weather forecast.
Sample view — fictitious data
Web app · In production
Healthcare · private
Staff scheduling & shifts
Rosters for a health centre. A weekly grid generated from a base template, absences with an approval flow, and substitutions assigned automatically by scoring each professional's skills and training. Staff swap weekend on-call shifts between themselves with notifications, and the whole roster imports and exports to Excel with an intelligent diff. Public read-only view, no login needed.
Sample view — fictitious data
Web app · Private client
Under NDA
Legacy migration & case management
A company running its business on an ageing desktop database needed to move to the web without losing two decades of history. I migrated the legacy schema and built a Spring Boot REST API over it, plus a React front end to manage clients, case files and amounts. Client, sector and data are confidential, so nothing beyond the engineering is shown here.
Web app · Academic research
Private
Research data collection
Data collection platform for a university research project. Participants answer anonymously through single-use links with an expiry date and a usage cap — no accounts, no tracking. Researchers get a dashboard with statistics, per-link filtering and CSV export that opens cleanly in Excel, plus a PDF of each submission.
Web app · Academic research
Private
Values-based music recommender
Built for an experiment testing whether people enjoy music picked by others who share their values. A questionnaire profiles each participant's values and personality; the engine then scores the distance between profiles and serves three playlists — one from a values match, one from a personality match, one random — which the participant rates blind. The researcher drives the experiment from a dashboard with tunable parameters and CSV export.