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Nicolas User

@nicolasuser4

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Full-stack JavaScript/TypeScript developer building production web apps from architecture to deployment.

France

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What I'm looking for

I’m looking for on-site, hybrid, or remote roles in Europe where I can build full-stack JavaScript/TypeScript products end-to-end, own architecture-to-production delivery, and work async across distributed teams.

I’m a full-stack JavaScript/TypeScript developer with a state-certified qualification (RNCP) and hands-on experience across the full technical stack—from architecture to production deployment. I’m comfortable working autonomously, async-first, and across distributed teams, and I’m open to on-site, hybrid, or remote roles across Europe.

I shipped a production application, Questmaker2, using Next.js 16 (App Router) + TypeScript with PostgreSQL (Neon), deployed on Vercel. I built a D&D-style productivity RPG with a rules-engine decision system, turn-based combat, and state recovery via pre-combat snapshots, plus security-focused authentication using HTTP-only cookies, CSRF validation, server-side input validation middleware, and database-level rate limiting.

I also contribute to open source: I integrated an academic neuroscience solution into a published Python package on PyPI and documented it on ReadTheDocs. Working with large 3D brain mesh data, I solved a structural occlusion problem using tools like VTK/PyVista/NumPy, and delivered a reusable function (vis_merged_flat()) with automated orientation and labeled outputs.

Experience

Work history, roles, and key accomplishments

Questmaker2 Full-Stack App

Questmaker2

Jan 2025 - Jan 2026 (1 year)

Built and shipped Questmaker2, a Next.js/TypeScript productivity app with an RPG layer that improves follow-through via player-driven D&D-style quests. Implemented session-based authentication with HTTP-only cookies, CSRF protection, database rate limiting, REST endpoints, and Docker/Vercel production deployment (~9,400 lines of TypeScript across 128 files).

Next.js TypeScript PostgreSQL Zustand Docker Vercel REST APIs CSRF

AI Chatbot w/ Persistent Context

AI Chatbot

Jan 2025 - Jan 2026 (1 year)

Developed an AI chatbot using LangChain.js and the OpenAI API with persistent long-term memory stored in PostgreSQL. Built a configurable, extensible UI and prompt system with robust error handling and architecture ready for function calling.

JavaScript TypeScript OpenAI API PostgreSQL Docker Error Handling Extensible Function Calling Architecture

SubCortexMesh Open-Source

SubCortexMesh

Jan 2025 - Jan 2026 (1 year)

Contributed to SubCortexMesh by solving a structural occlusion issue in 3D brain mesh visualization across 19 neuroanatomical structures (~95,000 merged vertices). Implemented a vis_merged_flat() pipeline with PCA-based orientation and added left/right rendering modes, integrating the fix into the public pip package and ReadTheDocs documentation.

Python VTK Pyvista NumPy PCA Orientation ROI Based Extraction PIP ReadTheDocs Documentation GitHub

Education

Degrees, certifications, and relevant coursework

CEFII, Angers

RNCP Professional Qualification — Full-Stack Web Developer (DWWM), Full-Stack Web Development

2025 - 2026

State-certified RNCP Professional Qualification for Full-Stack Web Developer (DWWM), completed through a 10-month intensive program covering modern JavaScript/TypeScript full-stack development.