Interactive worlds · 3D · Browser games
Nicolás Demaria
I build visual, interactive experiences for the browser: interactive 3D worlds and digital twins, browser games, real-time conversational avatars, and agent simulations.
available for remote work in 2026 · freelance or full-time remote
Work
Perplace
Perplace is the most important project I work on today. It is a 3D world creation tool: it generates editable 3D cities, buildings and interiors.
- editable 3D cities, buildings and interiors
- cities → buildings → interiors as one connected world
- private beta with paid per-project pilots
Doubland
Doubland is my most important freelance project with a client: eight months so far, working inside their team. It is a product by Doubland, Inc. in Pittsburgh: you create an AI Double based on your personality and watch it live in a town with other Doubles, as a show about you and your friends.
- most important freelance client engagement, eight months
- AI Doubles of real people, live 24/7 with replay
- agent movement, conversations, place data, replay, performance
Valley of Guardians
Valley of Guardians is a browser game product that kept growing beyond the core mechanic. It combines React + Vite + Supabase across auth, battle surfaces, leaderboards, shop flows, seasonal systems, admin tooling, and live operations.
- React + Vite + Supabase
- battle + leaderboard + shop + auth surfaces
Flópiti
Flópiti is a 2D multiplayer game I built around low-latency feel: React and Phaser on the client, a Node and uWebSockets authoritative server, destructible terrain, and custom networking with client prediction and reconciliation.
- React 19 + Phaser 3.90
- Node + uWebSockets.js + Matter.js
- destructible terrain + delta sync
This landing
This landing is one of my projects: a personal landing where a 3D VRM avatar talks with the visitor by voice in real time and answers in first person about the work.
- real-time voice conversation with Gemini Live
- VRM avatar with lip sync, blinking, gaze and gestures
- a whiteboard that draws on the audio clock
Jarre
I built Jarre as an open learning platform that turns YouTube videos into structured courses with generated lessons, quizzes, timestamps, voice tutoring, and spaced repetition.
- 44+ Supabase tables
- 6 pipeline stages
- 7 voice modes
Experiments
Besides the main projects, I keep 67 experiments and smaller builds since 2021, where I test techniques before using them for real: games, 3D scenes, desktop companions, apps with auth and data, AI agents and tools.
Experience
around 6 years overall · 5+ years of React and TypeScript in production
- IndependentDoubland: from Upwork to a direct contract
- PowtoonLondon-based company · AI video generation + TTS2022–2025
- Nano Appsfirst front-end job
- Digital HouseCertified Tech Developer2021–2023
- CoderhouseJavaScript tutor
- Lemondatatech company in Buenos Aires
About
I am obsessive about detail. I enjoy spaces, sensations and colors and have an eye for aesthetics, and three years of Architecture gave my creativity a technical method. I listen to what the client wants and never put my own preferences above it.
My stack leads with the visual side: Three.js, React Three Fiber and WebGL for 3D worlds, Phaser for browser games, and three-vrm for this avatar, all on React and TypeScript, where my production depth is 5+ years. Backend is a capability I integrate, not my lane: I know and can wire Supabase, SQL, auth, Docker and some Kubernetes, plus Node on game servers, and Python where a project needs it, like the e-translator document pipeline.
Off the clock I ride my motorcycle, swim in the sea and go hiking; I used to play basketball. I have always painted, drawn and written.
Contact
I am available for remote work in 2026, right away, depending on my freelance schedule at the time. That covers freelance projects, ideally ones that grow into long-term work, and full-time remote roles at a company I am passionate about.