Didier Krux

Fullstack Web3 Developer · Ethereum Foundation, Devcon team

I build and maintain the web apps behind Devcon and Devconnect, the Ethereum Foundation's flagship events.

• devcon.org, devconnect.org, and the interactive event app, a PWA attendees use on site.
• Showcased real-world Ethereum applications at the Devconnect World Fair in Buenos Aires, November 2025.
• New event and event app for Mumbai, with crypto payments for tickets through the pretix Ethereum payment plugin.
• Ethereum adoption work in Argentina and across the global ecosystem.

Next.js · TypeScript · PWA · Ethereum · pretix · Ticketing

Lead Developer and Co-Founder · Bankless Academy

A free, public-good education platform that onboards people to Ethereum, lesson by lesson, quest by quest.

• Content pipeline that turns Notion pages into published lessons, translated through Crowdin.
• Gasless, sybil-resistant badges built on Gitcoin Passport, and a white-label version of the platform for partners.
• Lessons built with 1inch, Optimism, Velodrome, Gitcoin, and Zerion.
• Interactive onchain quests: bridging, a DEX swap, an onchain vote.
• Sign in with Ethereum, plus ENS, EFP, Farcaster, Unstoppable Domains, and Lens profiles.
• Installable PWA with guided setup, and an onchain indexer that tracks progress across lessons and outside achievements.
• Dynamic social images per learner, with score and achievements.
• An AI assistant on Discord, Telegram, and X that answers crypto questions and points to the right lesson.

React · TypeScript · Next.js · PostgreSQL · Chakra UI · ethers.js · Notion API · ENS · NFTs · AI

Level 2 Contributor · BanklessDAO

Led development of four BanklessDAO season launch websites and helped the Education and Dev guilds get going in the early days.

• Season 2 to season 5 launch sites, each with its own interactive twist, including a three.js hex shader and a rotating 3D scene.

Tailwind CSS · three.js · JavaScript

Senior Software Engineer · Toasty (formerly Juven)

Video conferencing for interactive virtual meetings, and before that a business matchmaking platform driven by natural language processing.

• Admin panel and the interactive videoconference web app for Toasty Virtual.
• Set up and deployed dedicated Jitsi servers with live monitoring on AWS.
• Wrote technical specs, ran code review and UAT, mentored junior developers, handled deployments.
• Proposed and shipped backend structure changes that cut development time.
• For Toasty Matchmaking: admin panel, meeting scheduler, mobile web app, and a serverless matching engine scoring people with NLP.

React · TypeScript · Redux-Saga · Node.js · WebSocket · Redis · PostgreSQL · Python · NLP · Material UI · Jitsi · AWS · Grafana · Nginx

Software Engineer · Juven

Event management, membership, and online ticketing platform.

• Admin panel, event discovery, and ticket purchasing.
• Dynamic image resizing on AWS with Thumbor, Lambda, and CloudFront, up to 15 times faster page loads.
• SEO work and a custom Google Analytics dashboard in Data Studio.

React · Next.js · React Native · Redux · Node.js · MySQL · Knex.js · AWS · SEO

Full Stack Developer · SdV Plurimedia

Nine years building custom CMS and websites for three of the ten biggest French newspapers, LeParisien.fr, LePoint.fr, and LesEchos.fr, with millions of daily visitors.

• Custom CMS and front-end development on large-scale infrastructure with strict quality standards.
• Single sign-on, payment gateways, Facebook API, ElasticSearch, and years of Symfony.

PHP · Symfony · Laravel · MySQL · ElasticSearch · SSO · OAuth · Payment Gateways · jQuery · Responsive Design · SEO

Web Developer, work-study · IRCAD, WeBSurg

Websites and internal tools for a leading international medical research institute.

• Geolocation map with Google Maps, email filtering, and dynamic generation of course seating maps.

PHP · JavaScript · XML · Google Maps API

Web Developer Intern · IP-Media

Admin panel and Jabber server web interface for a videoconferencing product.

PHP · JavaScript · XML · Jabber

Devcon and Devconnect apps · Fullstack Web3 Developer

devcon.org, devconnect.org, and the Devcon event PWA for the Ethereum Foundation, including crypto ticket payments for the Mumbai event.

Bankless Academy · Lead Developer and Co-Founder

Free web3 education platform with a Notion-to-lesson pipeline, onchain quests, sybil-resistant badges, and an AI lesson assistant.

EthPage · Creator

Open-source ENS profile page served from IPFS, with EAS recommendations gated by EFP follows.

Onchain Quest and NewToWeb3 · Creator and developer

Web3 event platform for onboarding newcomers, with quests, QR check-ins, ENS subnames, EFP, EAS, and Zupass, built for NewToWeb3 and EthCC.

Onchain Summer Challenge · Hackathon project

Base Onchain Summer hackathon entry, first onchain action in under a minute with a smart wallet and a paymaster.

Peermatch · Hackathon project, ETHGlobal Lisbon

ETHGlobal Lisbon 2023, Optimism Silver prize plus Worldcoin and The Graph pool prizes.

VirtualGames · Founder and developer

Open-source online gaming platform with built-in video conferencing, built during the 2020 lockdown.

CoinMarketNews · Product and mobile developer

Cryptocurrency tracking app for iOS and Android with news, alerts, and 1,600 coins, built in three weeks.

Pieneer · Product and developer

Interactive presentation tool with live drawing, Q&A, and polling over WebSocket, built in one week.

Digital Krux · DJ and developer

DJ podcast with seventy sets and an audio-reactive Vue player, RSS feed included.

Smart Contract Programming · Ivan on Tech Academy

Programming smart contracts and building dApps on Ethereum, EOS, and NEM, from developer tools to testnet and mainnet deployment.

Full-time immersive coding bootcamp · Accelerate

Sixteen weeks and a thousand-plus hours building modern web and mobile apps, from React and React Native to Docker, CI with CircleCI, and both app stores.

Blockchain Deep Fundamentals · Ivan on Tech Academy

Cryptography, Bitcoin and Ethereum basics, scaling, consensus, UTXO, tokens, and smart contract use cases.

Bachelor's degree in Computer Science and Software, distributed systems designer-developer · IUT Robert Schuman, University of Strasbourg

Associate degree in Computer Science · IUT Robert Schuman, University of Strasbourg