11/02/2026 updated

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100 % available

Freelance Fullstack & AI Developer | Web | Automation | XR / Unity

Barcelona, Spain
Only remote
Master's in Artificial Intelligence, Master's Computer Graphics, Simulation & VR
Barcelona, Spain
Only remote
Master's in Artificial Intelligence, Master's Computer Graphics, Simulation & VR

Profile attachments

MarcFabian_CV_2026_EN_Freelance.pdf

About me

Freelance fullstack & AI developer (Next.js, TypeScript, Supabase, Python). I build web portals, AI integrations and automations end to end, plus 5+ years of Unity/XR. Fixed-price or day rate, milestone-based, fully remote from Barcelona. English, Spanish, Catalan

OpenAISupabaseUnity 3dApplication Programming Interfaces (APIs)Apple IOSComputer VisionAugmented RealityC Sharp (Programming Language)C++ (Programming Language)Software as a ServicePython (Programming Language)PostgreSQLNode.jsNext.jsTypeScriptReact.jsVirtual RealitySwift (Programming Language)Generative AIBackendAutomation AnywhereDocker
Fullstack web development
- Web apps, client portals and SaaS platforms with Next.js, React and TypeScript
- Backend and data: Supabase, PostgreSQL, Drizzle ORM, Node.js, REST APIs, webhooks, authentication and access control
- Admin panels, dashboards, landing pages and PWAs
- Java/Spring Boot and Angular in large production codebases

AI integration
- LLM features and AI assistants with the Claude and OpenAI APIs, prompt design
- AI that answers customer messages on WhatsApp and email
- Voice with ElevenLabs, AI image and video tools for content
- On-device computer vision (Apple Vision) and evaluation pipelines on real-world data

Automation and integrations
- n8n (self-hosted) and Make.com workflows, CRM and lead routing, Google Workspace, Zoho, Meta Business Suite

Mobile
- iOS apps in Swift, white-label apps published on the App Store and Google Play




































Experience

Professional experience5 - 10 years
Freelancer since2025

Languages

EnglishFluentSpanishNative speaker

Project history

Founder & Full-Stack Developer

Suitae (own product) (via UpIA Solutions)
Built and launched a white-label booking platform for aesthetic clinics in production with paying clinics: Next.js/TypeScript and Supabase/PostgreSQL web platform, plus white-label mobile apps published on the App Store and Google Play. Handled GDPR documentation as data processor.

Founder & Developer

Farai (own product) - farai.es (via UpIA Solutions)
AI customer-messaging panel allowing small businesses to answer WhatsApp and email messages with AI drafting and answering replies (GPT-5 mini), n8n workflows that filter spam and bots to keep AI costs low, and a Next.js landing site.

Digital Partner / Developer

Centro Medico Teknon, Barcelona (via UpIA Solutions)
Website, CRM and Make.com automations routing leads from Meta Ads and Instagram forms into Google Sheets and email. Built a staff time-tracking PWA deployed on own VPS, plus Meta Ads campaigns and AI-produced content (video, carousels).

iOS & Computer Vision Developer

DigitalAgeTeam
On-device face detection and validation app for HOV-lane access control (Swift, Apple Vision), plus a capture-and-reprocessing pipeline (device to VPS/S3) to re-run the algorithm on recorded data and track quality across versions.

Full-Stack Developer

Pulsar S&M (industrial SaaS) via DigitalAgeTeam
Features and fixes in a large production codebase: Java/Spring Boot REST APIs, JPA/Hibernate, Angular, SQL, Docker.

Full-Stack Developer

Private client (psychology practice) (via UpIA Solutions)
TypeScript monorepo with a deterministic scoring engine covered by automated tests, data packs validated against JSON schemas, and Docker deployment on a VPS with HTTPS and login. No personal data stored by design.

Interactive Educational 3D Web Experience Developer

Humboldt-Universitat zu Berlin (via UpIA Solutions)
Selected to build an interactive physics experience for workshop tablets (iPad), with mini-game modules and multi-language support. Fixed-price, milestone-based delivery with a documented proof of concept.

Senior Unity Developer

Metapark World
Designed the XR architecture and delivered a municipal-scale XR project in Unity.

XR Research Developer

Atos
Contributed to an internal XR research framework for real-time, multi-user experiences focused on latency and performance. Integrated the WebRTC plugin into Unity to enable multi-user XR sessions and deployed the STUN/TURN infrastructure as Docker images. Took part in the EU research project ICOS (cloud-edge continuum), with edge deployments in Romania and Italy on Kubernetes environments.

VR Developer

SyncVR Medical
Developed a VR rehabilitation application and iterated on it through usability sessions with clinicians.

Game Programmer

Tap Tap Tales
Unity/C# programming of educational games for children, shipped titles with 400,000+ downloads.

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