Over the last four years, I built financial systems for crypto-finance at XBTO, launched a SaaS platform for AI-assisted development (Merlin Cloud), and am shipping Out of Body, a video game in Jai (low-level systems language between C and C++, launching 2026).
With agentic coding, the surface area a single engineer can own has expanded radically. That's how I shipped Merlin Cloud solo: product positioning and pricing, full UX/UI design, marketing landing pages, multi-tenant container infrastructure, reverse tunneling, Stripe billing, Clerk auth, admin dashboard.
But I refuse to let low-level skills atrophy in the AI era. That's why I write the game in Jai, from scratch, by hand. AI makes POCs easy. Production systems still need an engineer who understands what they're building.
I do both: agentic where it accelerates, hand-written where judgment matters.
Founder & Product Engineer, BigSeed Studio
May, 2019 - Present
Founder. Two current projects: Merlin Cloud (production SaaS platform for AI-assisted development) and Out of Body (video game in Jai, launching 2026). Also take freelance and consulting work through BigSeed Studio on full-system product builds: SaaS launches, MVP rescues, architecture audits, AI integrations.
Senior Software Engineer – Financial Systems, XBTO
Jan, 2022 - Mar, 20264 years 2 months
Designed and owned the architecture of a financial data platform for a crypto-finance company (~100 employees), covering trade ingestion, reference data management, balance and position engines, and the computation of AUM, NAV, PnL, and exposures.
Built internal tools and dashboards for accounting, operations, and product teams to input, reconcile, and consume financial data.
Stack: Python, C#, PostgreSQL, SQL Server, NATS, internal data pipelines.
Full Stack Software Engineer, Ekimetrics
Feb, 2021 - Sep, 20217 months
Full-stack engineer on a data-driven application integrating outputs from an AI/ML pipeline.
Stack: Node.js, React, Next.js, BigQuery, Google Cloud.
Software Engineer, L'Oréal
Oct, 2020 - Jan, 20213 months
Built a full-stack application from scratch for a strategic L'Oréal cosmetics project.
Stack: Node.js, React, Next.js, BigQuery, Google Cloud.
Software Engineer, Forest Admin
Sep, 2017 - May, 20191 year 8 months
Full-stack engineer at Forest Admin, a SaaS that plugs into a database to generate a full-featured admin panel.
Joined as the company scaled from seed to Series A ($3M then $7M raised). Forest Admin was part of eFounders (the startup studio behind Mailjet, Spendesk, Front, Slite, Aircall), a high-growth ecosystem that shaped how I think about scaling early-stage products.
Stack: Node.js, Ruby on Rails, React, Ember.js, PostgreSQL, MongoDB, Docker, Redis.
CTO, Chatel Properties
Aug, 2016 - Sep, 20171 year 1 month
CTO of a real estate company specialized in high-quality goods. Built and managed the technical stack.
Stack: Node.js, AngularJS.
Founder, CodeTown
Jan, 2016 - Aug, 20167 months
Built an interactive online platform offering coding courses in different programming languages.
Stack: React, Node.js, PostgreSQL, Docker.
Co-Founder, MindUp
Oct, 2014 - Nov, 20151 year 1 month
Co-founder and lead developer of MindUp, a mobile proximity-chat startup. Reached 10,000 users.
Stack: JavaScript, MongoDB.
Software Engineering R&D, Intersec Group
Apr, 2014 - Sep, 20145 months
R&D on a big-data platform for large French telecommunications companies.
Stack: C, C++.
Software Engineering R&D Intern, Atos
Sep, 2013 - Mar, 20146 months
R&D internship on a big-data platform.
Stack: Java.
Merlin Cloud, BigSeed Studio
Jan, 2025 - Present
SaaS platform for AI-assisted development. Production at merlincloud.dev. Built solo, end-to-end.
Defined the product: positioning, target audience, pricing tiers, free trial, subscription model.
Designed the full product surface end-to-end: user flow, portal UX/UI, marketing landing pages, brand. Web access to terminal, files, git, notes from any device including mobile.
Architected multi-tenant isolation (per-user managed containers) and reverse tunneling for public dev-environment URLs.
Built operational tooling: admin dashboard with events, analytics, user lifecycle controls.
Stack: Python/FastAPI, HTMX, Tailwind, rootless Podman, Stripe, Clerk, PostgreSQL.
Out of Body, BigSeed Studio
Oct, 2023 - Present
Building a video game from scratch in Jai (low-level systems language between C and C++), without a game engine. Launching 2026 on Steam.
Sokoban-inspired puzzle game with classic Super Nintendo-era top-down pixel-art. Death-and-possession mechanic with elemental interactions (fire melts ice, rain extinguishes fire) across 112 hand-authored levels.
My roles: programming, game design, level design, music composition.
Custom engine: OpenGL renderer, custom audio (mixer, DSP, low-pass filter), custom asset pipeline.
Handmade immediate-mode UI with a Flexbox-style layout engine.
In-engine level editor.
Platforms: Windows, Linux, macOS
Python
TypeScript
Go
Rust
C
C++
Jai
C#
FastAPI
Node.js
PostgreSQL
SQL Server
MongoDB
Redis
NATS
REST
BigQuery
React
Next.js
AngularJS
HTMX
Tailwind CSS
Jinja2
Linux
Podman
Docker
Caddy
LXCFS
AWS
Google Cloud
Azure
OVH
Vercel
Stripe
Clerk
Doppler
Sentry
Claude Code
OpenCode
Agent orchestration
Unity
Custom engines
OpenGL
Network programming
Procedural generation
Shaders
SaaS platforms
Financial systems (crypto-finance)
Full-system product engineering
Real-time / networked systems
Game dev / Graphic programming
Computer Science, Master's degree, EPITECH - European Institute of Technology
Sep, 2012 - Sep, 2014
Computer Science, 4th year (exchange), California State University-San Marcos
Jan, 2013 - Dec, 2013
Computer Science, BTS IRIS, St Jean Baptiste de La Salle
Sep, 2010 - Jun, 2012
I've had the pleasure of working with Arnaud at XBTO for over 4 years — he is an exceptional full-stack engineer who moves from inception to delivery with incredible speed without sacrificing quality. He builds solutions that are intuitive, highly performant, and scalable — consistently meeting the most demanding requirements. Beyond his skills, Arnaud's positive attitude and collaborative spirit make him a true asset to any team.
J'ai eu la chance de travailler avec Arnaud sur le développement d'une web app métier. L'app était basée sur la visualisation de data complexe. J'étais dans l'équipe design et Arnaud recevait nos maquettes haute fidélité en input pour le développement. Arnaud a un sens du détail, il s'appliquait à respecter les maquettes à la lettre (Pixel perfect). Nous prenions le temps de revoir son développement ensemble. Arnaud a un bon sens de la communication, il a également su nous challenger sur certaines interactions, il a toujours eu de bonnes propositions. ça a été un plaisir de travailler avec lui !
J'ai eu la chance de travailler avec Arnaud sur un projet de développement web pour un grand groupe international. Arnaud est à la fois efficace, teamplayer, et apporte cadrage et bonne humeur à l'équipe. Son implication sur ce projet nous a permis de produire une application de grande qualité en un temps record en tirant parti de ses fortes compétences techniques, de ses suggestions pertinentes alliant innovation, réalisme et valeur à l'usage. Je le recommande et espère pouvoir collaborer à nouveau pour nos futurs projets.
Je suis impressionnée par le travail d'Arnaud sur ce projet : il est efficace, soigneux et attentif, il arrive à faire vivre les maquettes sophistiquées. J'espère que nous pourrons à nouveau travailler ensemble sur un nouveau projet.
Nous avons fait appel à Arnaud sur un projet stratégique avec des délais de livraisons très courts. Il a fallu monter une appli web from scratch. Arnaud a été un super partenaire sur la mission et a amené ses compétences de dev (React/Node), sa polyvalence et sa bonne humeur au projet. Il a un bon état d'esprit et a mené avec succès plusieurs demo à nos clients internes. Je le recommande !
Arnaud worked at Forest Admin for nearly 2 years and the whole technical team is sad to lose him. Arnaud has brought us a lot both technically and humanely. Passionate about code and avid learner, he has strongly contributed to improving our codebase while delivering quality features in a short time. Arnaud is also a person you can count on when it comes to passing on knowledge and helping his team members.
Arnaud spent about 6 months with us, and he will be missed. He is a passionate, result-oriented software engineer with the drive of a reckless entrepreneur. Both opiniated and constructive, Arnaud also has a very good sense of humor that comes with consistently high spirits, and I have absolutely no doubt he will succeed in turning his projects into successful products & services.