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Founded by passionate advocates of learning and innovation, Learni set out to make professional training accessible to everyone, everywhere in the world. Our team works in the largest cities such as Paris, Lyon, Marseille, and internationally, to support talents and organizations in their skills development.
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30 free minutes with a training advisor — no commitment.
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Artificial Intelligence training in Raleigh in June 2026 with Learni. Certified, expert trainers, eligible for employer funding. Free quote.
Professional Training training in New York in September 2026 with Learni. Certified, expert trainers, eligible for employer funding. Free quote.
Cybersecurity training in Sheffield in November 2026 with Learni. Certified, expert trainers, eligible for employer funding. Free quote.
Discover how design thinking training programs in March 2026 will equip innovation teams with cutting-edge skills for problem-solving, collaboration, and breakthrough creativity in a rapidly evolving business landscape.
Don't let this gap widen
Sans maîtrise Web3.js expert, 70% des dApps échouent à l'audit sécurité, exposant à des hacks coûtant en moyenne 3M€ par incident comme Ronin (625M$ volés).
Perdez 40% de gas inutilement sur transactions mal optimisées, manquez 25% de performances en subscriptions défaillantes, ratez des opportunités DeFi/NFT générant x10 ROI.
Vos concurrents déploient scalables sur L2 tandis que vos prototypes crashent en prod, gas fees explosent +200% sans batching.
Investissez 28h ou risquez obsolescence : 80% devs juniors stagnent sans upskill Web3.js, fuyez retards projets et pertes clients.
The Formation Web3.js - Développez des dApps blockchain avancées training is delivered in-person or remotely (blended-learning, e-learning, virtual classroom, remote in-person). At Learni, a Qualiopi-certified training organization, each program is designed to maximize skills acquisition, regardless of the training mode chosen.
The trainer alternates between demonstrative, interrogative, and active methods (through practical exercises and/or real-world scenarios). This pedagogical approach ensures concrete and directly applicable learning in the workplace.
To ensure the quality of the Formation Web3.js - Développez des dApps blockchain avancées training, Learni provides the following teaching resources:
For in-house training at a location external to Learni, the client ensures and commits to having all necessary teaching materials (IT equipment, internet connection...) for the proper conduct of the training action in accordance with the prerequisites indicated in the communicated training program.
The assessment of skills acquired during the Formation Web3.js - Développez des dApps blockchain avancées training is carried out through:
Learni is committed to the accessibility of its professional training programs. All our training programs are accessible to people with disabilities. Our teams are available to adapt teaching methods to your specific needs. Do not hesitate to contact us for any accommodation request.
Learni training programs are available for inter-company and intra-company settings, both in-person and remote. Registration is possible up to 48 business hours before the start of training. Our programs are eligible for OPCO, Pôle emploi, and FNE-Formation funding. Contact us to discuss your training project and funding possibilities.
Plongez dans l'installation et configuration de Web3.js 4.x, connectez-vous à divers providers comme Infura ou Alchemy via exercices pratiques, manipulez comptes, balances et transactions batchées sur testnets, créez vos premiers scripts utilitaires pour signer et broadcaster, testez en live sur Sepolia pour valider robustesse et scalabilité, repartez avec des templates prêts à l'emploi qui boostent votre productivité immédiate.
Maîtrisez les appels view/pure et mutations state-changing avec ABI dynamiques, encodez/décodez paramètres complexes via exercices sur contrats ERC-721/1155, gérez multisig et batch transactions pour gas savings, simulez interactions sur forks mainnet avec Hardhat, développez un wallet décentralisé fonctionnel, intégrez logs parsing pour debugging avancé, vivez l'excitation de déployer vos propres contrats interactifs en temps réel.
Configurez subscriptions WebSocket pour événements en temps réel sur Polygon et Optimism, filmez logs avec topics avancés et bloom filters, intégrez IPFS pour metadata décentralisée via exercices dApps NFT, optimisez polling hybride pour fiabilité maximale, gérez reconnexions automatiques et backoff strategies, construisez un dashboard live monitoring transactions, ressentez le pouvoir d'une dApp réactive qui capte chaque blockchain event instantanément.
Sécurisez contre reentrancy et sandwich attacks avec guards Web3.js, profilez gas via estimations batch et optimisez loops, intégrez TheGraph pour indexing queries, déployez dApps full-stack avec React/Vue via ateliers pratiques, auditez votre code avec slither intégré, setup CI/CD GitHub Actions pour tests automatisés, finalisez un projet capstone déployé sur Vercel/IPFS, repartez certifié avec portfolio pro qui impressionne recruteurs.
Target audience
Développeurs blockchain seniors, architectes dApps Ethereum, lead devs Web3 en quête de montée en compétences sur Web3.js.
Prerequisites
Maîtrise avancée JavaScript ES6+, expérience Solidity et Ethereum, connaissance APIs blockchain comme Ethers.js.
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