One engineer.
The output of a studio.
A senior engineer who orchestrates AI end to end — shipping crypto, AI, and product work that usually takes a whole team. The expertise leads; AI scales it.
One builder, the range of a studio.
Every layer engineered to the same standard, with AI directed as a force multiplier — never a substitute for craft.
Cross-platform products
Web, mobile, and desktop from a single Kotlin Multiplatform core — one codebase, every screen.
Crypto & smart contracts
Bitcoin, Lightning, and Ark; Sui and Move; Ethereum and Solidity — wallets, DeFi, and real-world assets, from protocol to interface.
AI-native products
Agents, LLM applications, and orchestration designed in from the start, not bolted on.
Brand & content
Identity, narrative, and visuals shipped through an AI-assisted creative pipeline, held to an editorial standard.
Proofs of one builder.
Four shipped proofs — crypto, AI, product — and the method that makes them possible.
Piko
A consumer product taken solo from blank repository to the store — engineering, design, content, and growth held by one hand.
Thalia · Volalti AG
A Kotlin Multiplatform wallet spanning on-chain, Lightning, and Ark, with TradFi alongside — one self-custodial surface over the whole stack.
BitGPT · x402
Native payment rails for autonomous agents — machines that hold value and settle in crypto without a human in the loop.
TDEX
A non-custodial exchange on Liquid — atomic swaps settled trustlessly, no order book, no counterparty to trust.
One engineer, a decade of craft, shipping at the scale of a studio.
His command of the modern tools is the studio: for every task, the right one, in his hands.
How the work gets made.
We begin in observation — mapping the problem, its constraints, and its real users before a single line is committed.
The foundations are set by hand: architecture, security, the shape of the interface. A senior engineer owns every structural decision.
From there, one engineer directs a fleet of AI to build at the pace of a full team — shipping fast, refining under a steady hand until the work holds.
One engineer.
A studio's range.
Stéphane Roche has spent a decade building software that ships — from Ledger in 2015, where Bitcoin became the discipline, through Liquid and atomic swaps, Solidity, and Move smart contracts on Sui. He builds financial products he understands as the investor who trades them, not just the engineer who codes them. The work spans dev, design, and product because one person now directs what once took a team: AI is the instrument, not the author. Seniority sets the standard; orchestration sets the pace. Founding member of Ethereum France. Bitcoin-dev trainer. Still shipping.
production software
Open frequencies.
Founders charting a first build, crypto teams mapping the next protocol — the work begins the same way, with one conversation.