Available for new projects
Full-Stack Developer
I build web and mobile products end to end — with AI, 3D and an obsessive eye for detail — and ship them to production.
0+
years of experience
0%
less invoicing time in a real ERP
0
microservices in production
0
languages across my products
About me
Cristian Alejandro
Full-Stack · Cristian.code
I'm Cristian Alejandro, a full-stack developer with over four years building web and mobile applications end to end: analysis, architecture, backend, frontend, database and production deployment on Docker and Linux. I live in Alicante and work remotely, hybrid or on-site in the area.
Before writing code I was a multimedia designer: corporate identity, motion graphics and digital marketing with the Adobe suite. That designer's eye is why my interfaces feel crafted; the engineer's is why they hold up in production.
I add the most value on projects that demand owning the whole problem, especially in regulated, auditable environments — public administration, FUNDAE state-funded training, legal invoicing — where software must not only work but be able to prove it. I integrate AI where it genuinely helps: OCR, biometrics, computer vision and LLMs in real products. And through my brand, Cristian.code, I build microapps of my own for others to use.
Multimedia production
SENA · 2021 – 2025
Programming diplomas (1,600 h)
CUN · 2022
User experience design
Google · 2023
Spanish (native) · English (technical documentation and repositories)
My journey
2019 – 2023Redis Gráfica · Nena · Lolys
Corporate identity, advertising, motion graphics and digital marketing for several brands. The visual foundation that still shapes how I code.
2023Weex Capital
Cryptocurrency payments via API, real-time Bitcoin pricing and an admin panel; plus the control panel for a nationwide ATM network.
2024Futurotel · Calicer · Rondasur
A booking and payment system for a hotel chain, a full Laravel and Vue 3 module inside a Jira team, and a Moodle platform built from scratch.
2024 – 2025CardionIns
Over 1,000 TypeScript files. Automatic legal invoicing that cut the time from 30 to under 2 minutes per document (−93%).
2025 – presentCloud WiFi
Migrated a live ISP from PHP 5 to PHP 8.2 and built identity verification with OCR, facial biometrics and liveness detection, plus invoice handling with GPT-4o.
2026Eco Combustión · Urbaser
Five microservices integrated with the government's official API, reporting every 15 minutes, with a React and MapLibre dashboard in English and Arabic.
2026Maguesde
Doubled certified students (39 → 82), recovered 2,297 records destroyed in a migration and left the platform inspection-ready.
How I work
From idea and architecture to deployment and maintenance. One person accountable for making it work.
OCR, biometrics, computer vision and LLMs built into real products, not demos.
Software you can audit: FUNDAE, public administration, VAT invoicing and GDPR.
Polished, accessible, fast interfaces, with animation and interaction considered down to the last detail.
Projects
01 / 06Client project
Real-time tracking of the city's waste-collection fleet, reporting automatically to the national administration. Truck and RFID container telemetry, a daily compliance algorithm and a dashboard with an interactive map.
5 services · reports every 15 min02 / 06Client project
A complete ERP for a healthcare company selling defibrillators and CPR training: 14 modules, automatic legal invoicing with PDF and business dashboards with maps.
−93% invoicing time03 / 06Live web app
A freemium SaaS productivity platform with AI tools, a persistent Kanban and an automated blog. NestJS + Next.js monorepo documented with Swagger.
Live in production04 / 06Live web app
Invoicing and accounting for freelancers and small businesses, with Stripe payments, modern authentication and six languages.
6 languages · Stripe05 / 06Live web app
A PWA to manage tasks, workflows and notes that works offline and in six languages.
Works offline06 / 06Mobile app
A mobile dream journal with local SQLite persistence, five languages, configurable themes and Excel export.
Published on Google PlayCloud WiFi
Identity, invoicing, signing and infrastructure for a telecom operator, built from scratch and running in production.
01 / 06Built for Cloud WiFi
A microservice that reads national IDs, residence permits and passports with OCR and MRZ, matches the selfie against the document photo and requires video liveness with real-time blink and head-turn detection.
Real-time liveness detection02 / 06Built for Cloud WiFi
A biometric verification API on NVIDIA GPU: OCR with vision models, anti-fraud selfie checks, a face-matching ensemble, remote QR verification and HMAC-signed webhooks.
NVIDIA GPU · CUDA03 / 06Built for Cloud WiFi
A digital signature platform: generates documents from DOCX templates, converts them to PDF, sends the signing link over WhatsApp and captures handwritten signatures on any device.
Sign on any device04 / 06Built for Cloud WiFi
A system that reads PDF or image invoices with GPT-4o, extracts the tax data and stores it in a database with a management panel, JWT authentication and migrations.
GPT-4o with vision and PDF05 / 06Built for Cloud WiFi
An API that queries several Proxmox clusters in parallel, normalises node, virtual machine and storage metrics, detects anomalies and keeps answering even when a datacenter fails.
Multiple datacenters in parallel06 / 06Built for Cloud WiFi
Migration of the live ISP management system from PHP 5 and CodeIgniter 2 to PHP 8.2 and CodeIgniter 4: about 10,800 symbols reorganised with design patterns and mandatory tests.
PHP 5 → PHP 8.2, zero downtimeTechnologies
Six constellations and over four years of real production work. Hover any technology or pick a category.
Fast, accessible interfaces with carefully crafted animation.
APIs and services that hold up in production: REST, WebSockets and authentication.
Modelling, migrations and queries on relational and document databases.
OCR, biometrics, computer vision and LLMs built into real products.
Containers, proxies, TLS and production-ready servers.
Mobile, desktop and content and learning platforms.
Services for local businesses
I build websites, applications and custom software for independent professionals and businesses in Benidorm and the province of Alicante. Work directly with me, from the first idea to production.
Fast, mobile-friendly websites with content search engines can read. Carefully designed interfaces and features tailored to your business.
Management dashboards, invoicing, SaaS platforms and mobile apps. My work includes a 14-module healthcare ERP and published products you can explore in my portfolio.
API integrations, AI document processing and task automation. The ERP in my portfolio reduced invoice generation from 30 minutes to under 2 minutes.
Microapps
Lightweight apps that do one thing and do it well. Choose a subscription or pay once and keep it.
* Sample catalogue: names and prices are indicative until the real apps are published.
Focusly
Focus more, get distracted less.
€3.99/mo
Invoicing without the headaches.
€7.99/mo
Sharp images, no pixelation.
€29.00one-time
Yours forever
Think with your hands.
€2.99/mo
From HTML to perfect PDF.
€19.00one-time
Yours forever
Message me and we'll build it together: tell me what problem you want to solve and one day that microapp will be available for you.
Contact
Tell me your idea and I'll reply directly on WhatsApp. No forms, no middlemen: you write, I answer.
What would you like to talk about?
WhatsApp will open with your message already written. This site stores nothing.
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