Zitytraining
A project for a real client and, at the same time, a great example of frontend development. Calendar, client management, accounting, payments… come in and take a look.
- Next.js 16
- React 19
- TypeScript
- Tailwind CSS 4
- NestJS
- MongoDB
- +4
Senior full-stack developer
Diego Galisteo Reina
I build web applications end to end with React, Angular, Node (NestJS) or Python. And crystal-clear code.
Projects
Three apps, each with its own backend. See them in action and click for the details.
China History
Three LLMs talking to each other to recreate China's history anywhere, anytime, with a narrative and a photorealistic illustration grounded in real sources.
- NestJS
- LangGraph
- LangChain
- MongoDB Atlas
- Anthropic
- OpenAI
- +2
In progress
Historical Documents Reader
An app to read and explore historical documents. Currently under construction.
- Next.js
- NestJS
- MongoDB
- TypeScript
Résumé
Experience, education and technologies.
↓ Download résumé (PDF)
Senior software engineer with 14+ years of experience building scalable web applications, specialized in 3D visualization and AI-powered solutions using large language models (LLMs). Strong background in full-stack development, system design and performance optimization.
Experience
Full-stack developer
Freelance · Madrid · May 2026 – present
Full-stack developer
Scriptum-AI · Madrid · Feb 2025 – May 2026
Production applications powered by LLMs. Leonardo: analysis of real court hearing video and audio, with automatic transcription, summarization and structured reports. Scriptum Contract: intelligent document comparison. LLM integration in production, prompt engineering and architecture.
- React
- Node.js
- Angular
- Python
- LLMs (Claude)
Full-stack developer
Nexplore (Dimática) · Madrid · clients Nexplore US and Hotchief Germany · Dec 2020 – Feb 2025
High-performance 3D platform for point clouds, 3D models and orthophotos. Measurement tools, volume calculation and element mapping; rendering optimization for large datasets in the browser, in international remote teams.
- Angular
- Python
- React
- Three.js
- Node.js
- MongoDB
- WebGL
Full-stack developer
Mapfre (Capgemini) · Madrid · Oct 2019 – Dec 2020
NSEc, vehicle management: internal application built from scratch, starting at analysis. Led the Angular frontend, integrated REST and SOAP services and contributed to the Java (Spring) backend, in a Scrum environment.
- Angular
- Java
- Spring
- REST/SOAP
- JUnit
DSD China team coordinator
DigitalSmileDesign · Madrid · Jul 2018 – Oct 2019
Daily coordination of the Shanghai design team, frequent trips for training and management, and tools to make their work easier, in a Chinese-speaking environment.
- Visual Basic
Full-stack developer
Vintegris · Madrid · client BBVA · Jul 2015 – Jul 2018
One of BBVA's core security systems: migration to microservices, new features for critical components, SQL and MongoDB databases and internal configuration tools with Vaadin, in high-security, high-availability environments.
- Java
- Spring
- Kubernetes
- MongoDB
- SQL
- Angular
Graphics developer
Continex · Madrid · client Nolve · Mar 2015 – Jul 2015
Custom graphics library with FreeType font support to replace SDL, improving rendering flexibility and performance.
- C/C++
- SDL
- FreeType
Web developer
Freelance · Madrid and London · Aug 2013 – Mar 2015
Websites and web applications for clients and personal projects, from development to deployment.
- HTML
- CSS
- JavaScript
Unity developer and technical artist
Topcells · Shanghai, China · Jul 2012 – Jun 2013
2D/3D interactive applications: gameplay systems in Unity3D and creation and integration of real-time assets.
- Unity3D
- C#
Computer engineer and graphic designer
Consulate General of Spain · Shanghai, China · Dec 2010 – Oct 2011
IT infrastructure, servers, networks and website, and technical support for conferences and events, in an international environment.
Education
B.S. Computer Engineering
University of Valladolid (UVA)
Final thesis passed with honors.
Master's in Videogame Development
Complutense University of Madrid (UCM)
Master's in 3D Design
Trazos · Madrid
Languages
- Spanish · Native
- English · C1
- Chinese · Advanced · HSK 4 (B1), HSK 3 certified
Technologies
- Frontend
- React
- Next.js
- Angular
- Three.js
- TypeScript
- Backend
- Node.js
- NestJS
- Python
- Java (Spring)
- Databases
- MongoDB
- SQL
- AI / LLMs
- LLM integration (Claude)
- Prompt engineering
- Other
- WebGL
- REST APIs
- Microservices
Contact
Have a project or an opening? Drop me a line and I'll get back to you as soon as I can.