Freelancers in ZaragozaFreelancers in Zaragoza
ProjectsPeople
Alberto Guinda's avatar
Alberto Guinda
Zaragoza, Spain
AI Agent & Full-Stack Engineer · LangGraph · RAG · AI Apps
New to Contra
AI Agent & Full-Stack Engineer · LangGraph · RAG · AI Apps
Cover image for 🚀 A multi-tenant booking SaaS
🚀 A multi-tenant booking SaaS shown end-to-end From the product site that sells it, to the white-label site each business gets, straight to the dashboard that runs it all. 🤖 How it works: Customers book by chatting with an AI assistant in a messaging app. Every booking carries the channel it arrived through, turning chat conversations into a highly visible, organized agenda for the business owner. 📊 The Admin Panel: Live Analytics: Complete with an occupancy heatmap. Full Agenda Management: Create, reschedule, confirm, complete, or mark as no-show. Smart Operations: An auto-built customer CRM (generated directly from bookings), catalogue & staff management, and bot-collected reviews. Real-World Flexibility: The owner can force an appointment on top of another. Barbershops squeeze people in every day, and software that forbids it simply gets abandoned. 🛠 The Tech Stack: Frontend: Vite + React 19 + HeroUI v3 Backend: FastAPI (Python 3.14) on PostgreSQL Static Sites: Astro hosted on Cloudflare Monetization: Stripe subscriptions with a 30-day trial Data Integrity: No double-booking is guaranteed by a robust database exclusion constraint, rather than just relying on the interface. 🌍 Status: Live in production and successfully taking real appointments for a barbershop in Zaragoza.
2
238
Cover image for Recruiters sit on hundreds of
Recruiters sit on hundreds of CVs they can't search. Keyword search misses the obvious — the candidate wrote "React", you searched "frontend", they never surface — and every AI tool that fixes that ships candidate data to a third-party API. I built RecruitSecure AI to do the semantic search without the API call. The embedding model runs server-side through Transformers.js (quantized multilingual-e5-small, 384 dimensions, 100+ languages), so you can ask in Spanish and it finds CVs written in English — and nothing ever leaves the deployment. Drop in PDFs or DOCX and it extracts name, email, skills and experience, indexes each CV as a vector, and answers plain-language queries like "frontend lead who has built a design system": ranked by relevance, each result showing the exact CV fragments behind the match, so the recruiter sees the reason and not just a score. Retrieval is hybrid — pgvector HNSW cosine fused with BM25 full-text through Reciprocal Rank Fusion, then re-ranked from the recruiter's own thumbs up/down. Next.js 16, React 19, strict TypeScript, PostgreSQL + pgvector through Drizzle ORM, Auth.js, Stripe subscriptions, multi-tenant with AES-256-GCM encryption at rest and GDPR export and deletion. Built solo, end to end. The video is the real application: ten synthetic CVs uploaded through the actual pipeline, extracted, embedded and searched. Nothing staged.
3
371
Cover image for A conversational AI copilot that
A conversational AI copilot that takes a buyer from "I want to reserve" to contract and receipt. A LangGraph agent orchestrates 19 tools with human-in-the-loop confirmation before any payment, session memory, and RAG — over a transactional backend with hard guarantees (no double-booking, Stripe + webhook reconciliation, full audit) and a 3D/BIM viewer with a first-person walkthrough. Stack: TypeScript, LangGraph.js, Hono, PostgreSQL/Drizzle, React 19, react-three-fiber. LangSmith observability with GDPR PII redaction.
1
369
Cover image for A health-tracking Android app for
A health-tracking Android app for logging blood pressure, oxygen, pulse, glucose and weight — designed for elderly users first. Oversized one-digit-at-a-time keypad, high-contrast readings, and a one-tap printable report their doctor can actually read. Medication list that keeps withdrawn drugs visible in red instead of hiding them, so nobody takes one by mistake. Offline-first: the database lives on the device and never leaves it unless the user syncs it to their own LAN server. Built with Expo/React Native in strict TypeScript across 15 languages, with speech input, a marketing site in Astro on Cloudflare Pages behind a hash-pinned CSP, and a Hono + SQLite sync server with last-write-wins reconciliation.
1
341
Diego Carrodeguas's avatar
Diego Carrodeguas
Zaragoza, Spain
AI Architect & Founder at Vextria | AEO & GEO Expert
AI Architect & Founder at Vextria | AEO & GEO Expert
Cover image for High-Performance UI/UX: Premium Vanilla Web
High-Performance UI/UX: Premium Vanilla Web Development (No CMS) Desarrollo de una interfaz de usuario de alto impacto utilizando exclusivamente código nativo (HTML5, CSS3, Vanilla JS). El enfoque se centra en la "Arquitectura Zero-Bloatware", eliminando dependencias pesadas para lograr una experiencia fluida, segura y ultra-ligera.
0
52
Cover image for The "Link Magnet" Strategy: Engineering
The "Link Magnet" Strategy: Engineering Viral & Semantic Technical Guides Creación de una guía maestra de +2000 palabras diseñada como la "Fuente de Verdad" definitiva para un nicho técnico (IA). Optimizada no solo para usuarios, sino para ser procesada y citada por modelos de lenguaje (AEO).
0
47
Cover image for Neuro-Marketing UI/UX (Futuristic Conversion Design) Creación
Neuro-Marketing UI/UX (Futuristic Conversion Design) Creación de un sistema visual premium basado en principios cognitivos para reducir la carga mental y guiar la atención hacia la conversión masiva.
0
56
Cover image for AI-Native Authority Strategy: Answer Engine
AI-Native Authority Strategy: Answer Engine Optimization (AEO) Implementación de una red de datos estructurados masivos para facilitar la recomendación de marca por parte de modelos como ChatGPT y Perplexity.
0
66
Jorge Bonet's avatar
Jorge Bonet
Zaragoza, Spain
Let´s create together!
Let´s create together!
Cover image for Koti - Real Estate Marketing
Koti - Real Estate Marketing
0
12
Cover image for allende25 - Real Estate Brand
allende25 - Real Estate Brand
0
16
Cover image for Soulvenirs - Ecomm Brand
Soulvenirs - Ecomm Brand
0
20
Placeholder project card media
View more →
Javier Pérez's avatar
Javier Pérez
Zaragoza, Spain
Web Designer with more than 10 years of experience
Web Designer with more than 10 years of experience
Cover image for Bubbo | Guía de Streaming & Social Media App | Recomendación de…
Bubbo | Guía de Streaming & Social Media App | Recomendación de…
0
15
Cover image for Bubbo on the street
Bubbo on the street
0
9
Cover image for Introducing Bubbo AI
Introducing Bubbo AI
0
11
Cover image for Grabados Antiguos Lanzarotes
Grabados Antiguos Lanzarotes
0
10
Simon Williams's avatar
Simon Williams
Zaragoza, Spain
Versatile 2D Animator & Illustrator Expert
Versatile 2D Animator & Illustrator Expert
Cover image for Frame-by-frame 2D Character Animation with Dialogue
Frame-by-frame 2D Character Animation with Dialogue
0
3
Cover image for 2D Character Animation for TikTok
2D Character Animation for TikTok
0
3
Cover image for 2D Story-Focused Character Animation for Popular YouTube Channel
2D Story-Focused Character Animation for Popular YouTube Channel
0
2
Placeholder project card media
View more →