gm, I'm Didier Krux.

The Devcon and Devconnect websites and the interactive event app: a web app attendees install on their phone for the schedule, the map, and what is happening right now.

The app ran the Devconnect World Fair in Buenos Aires in November 2025, a week of real Ethereum applications for real people, with in-person crypto payments across the venue. Since 2026, tickets can be bought onchain through the pretix Ethereum payment plugin.

The quiet part of the job is adoption: helping the Argentine community and the wider ecosystem use Ethereum for things people actually need.

Bankless Academy teaches Ethereum, DeFi, NFTs, and DAOs through short lessons and hands-on quests, free and open source, in 28 languages. Lessons live as Markdown in the repository and compile at build time; translations are generated by AI against the English source and re-run only for what changed.

Learners sign in with Ethereum and bring their identity along: ENS, Basenames, EFP, Farcaster. Quests make you actually do the thing: bridge, swap on a DEX, cast an onchain vote. Badges are NFTs on Base, minted gasless through a smart wallet and paymaster, with proof of personhood from Human Passport keeping bots out. An indexer tracks progress inside and outside the Academy, and every learner gets dynamic social images with their score.

Around the core: a Farcaster mini app and a React SDK that embed lessons anywhere, a white-label version for partners, lessons co-built with 1inch, Optimism, Velodrome, Gitcoin, Zerion, and Rocket Pool, and an AI assistant on Discord, Telegram, and X that answers crypto questions with a link to the right lesson.

EthPage turns ENS records into a link-in-bio page: avatar, header, bio, socials, links, served from IPFS at yourname.eth.limo. Change a record, the page follows. No backend, no analytics, no API keys.

The twist is onchain recommendations: visitors sign an EAS attestation on Base for a few cents, and it goes public only when you follow the author on EFP. Follow is the moderation. Fork, edit one config file, pin, and it is yours.

NewToWeb3, November 2024, was an event for people who had never touched Ethereum, organized with OrnellaWeb3. Its app, built in six weeks: program, sponsors, and hands-on quests to get your first crypto, mint a POAP and an NFT, claim an ENS on Base, and swap a token. Multilingual, because the room was.

It grew into Onchain Quest, a white-label event platform: wallet login, profiles, quests with points, QR booth check-ins, leaderboards, ENS subnames via Durin, EFP follows, EAS attestations, Zupass ticket proofs, a Farcaster mini app, and an onchain shop. It has since run at EthCC.

A hackathon entry for Base's Onchain Summer: from zero to a first onchain action in under a minute, with a smart wallet created on the spot and gas covered by a paymaster.

A swipe app to find peers, co-founders, mentors, or a team at a hackathon, built in a weekend at ETHGlobal Lisbon. Optimism Silver prize for Decentralize Our Identities, plus the Worldcoin and The Graph pool prizes.

A companion to the BanklessDAO proof-of-competence tasks: the POAPs and NFTs earned along the way, and where you stand on the journey.

Every BanklessDAO season opened with a launch site. Four of them: one showcased 36 projects in an interactive 3D scene, one ran a hex shader, one spun a dodecahedron. Small sites for a big community, and three.js learned in public.

A video conferencing product for interactive virtual meetings, launched into the first months of the pandemic: admin panel, videoconference web app, and dedicated Jitsi servers on AWS with live monitoring.

A business matchmaking platform pairing event attendees with natural language processing: admin panel, meeting scheduler, mobile web app, and a serverless matching engine scoring people against each other.

Event discovery, ticketing, and the admin panel behind them. The piece worth keeping: dynamic image resizing on AWS with Thumbor, Lambda, and CloudFront, pages up to fifteen times faster.

Custom CMS and front-end work at Les Echos, on a team running Symfony, ElasticSearch, and agile sprints for a site the French business world reads every morning.

Almost seven years at Le Parisien: custom CMS, front-end, single sign-on, payment gateways, the Facebook API, and shipping to millions of daily readers without breaking the morning paper.

A work-study year at IRCAD: the institute's websites and internal tools, from a geolocation map to seating plans generated on the fly for surgical courses.

A Snapchat lens that puts Meebit 11752 on my face for video calls, with mouth tracking and eye blinking. The same character lives on this site.

Built during the first lockdown so friends could play together online: an open-source gaming platform with a private Jitsi video room built in. Free, no account, share a link and play.

A bootcamp capstone and a first mobile app: prices for 1,600 coins in several currencies, favorites, tagged news, price and news alerts, dark mode. Designed, shipped to both stores, and marketed in three weeks.

A one-week build for teachers and speakers: a slideshow the room can draw on, ask questions about, and vote on from their phones, all over WebSocket.

A personal development coaching blog for a friend, designed and built from scratch, entirely remote.

A sustainable lifestyle and innovation platform whose site had to work before a major conference in China: new hosting, desktop and mobile fixed, pages ten times faster.

An electronic music news site with a custom admin panel and automatic track imports from YouTube, SoundCloud, iTunes, Beatport, and Shazam. Fifteen years of new releases.

Digital Krux is my DJ alias: seventy podcasts and live sets between 2007 and 2017, from Karnakut parties to Miami. Once a WordPress blog synced to iTunes, since 2025 a Vue player with a canvas grid that lights up to the music. The same sets play in the DJ booth here.