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Training Web3.js 2026 - Interacting with Ethereum Blockchains

Ref: HHP102
10 people max.
5500€ HT / per person
−15% from 2 people−30% from 3 people−50% from 5 people
Pay in 3 installments · +$170/day onsite · +$500 with certification exam
5 journées
distanciel

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Learning objectives

  • Master Web3.js 2026 to interact with Ethereum smart contracts in production.
  • Develop professional DApps connected to multiple blockchains.
  • Implement secure wallets and signatures in Web3 applications.
  • Optimize RPC calls and blockchain events for scalable performance.
  • Design fluid user interfaces integrating decentralized data.
  • Deploy certified solutions tailored to corporate professional training needs.

The Learni story

Founded by passionate learning and innovation experts, Learni's mission is to make professional training accessible to everyone, anywhere in the world. Our team operates in major hubs — London, New York, Boston — and internationally, to support talents and organizations in upskilling.

Don't let this gap widen

Why this program matters

  • Without this upskilling, your team accumulates a technological gap that translates directly into productivity loss.

  • Organizations that don't train their talents on key topics see their competitiveness drop.

  • Every quarter without training is a gap widening with competitors who invest.

  • The cost of inaction quickly exceeds that of well-targeted training.

Allan Busi
Allan Busi

Learni Trainer · Expert

73%productivity gap
×3cost of inaction

Program

Module 1Web3.js 2026 Fundamentals: Installation and Blockchain Connections (MetaMask, RPC Providers)

Discover the installation of Web3.js 2026 and its evolutions, configure providers like Infura or Alchemy for stable connections to Ethereum and Polygon networks, perform your first blockchain calls through practical exercises on testnets, integrate MetaMask for secure user interactions, produce a simple ETH balance reading script, and test live with integrated debugging tools to validate your professional skills from day one.

Module 2Smart Contract Management with Web3.js 2026: ABI, Calls, and Transactions (ethers.js Comparison)

Dive into ABI manipulation to interact with deployed smart contracts, code read-only and write calls with optimized gas fee management, simulate transactions on Sepolia testnet using advanced Web3.js 2026, compare with ethers.js to select best practices, develop a decentralized voting contract through practical workshops, and generate event logs to monitor blockchain states in real time.

Module 3Wallets and Security with Web3.js 2026: Signatures, ENS, and Multi-Chain (Layer 2 Support)

Integrate wallets like MetaMask and WalletConnect with Web3.js 2026 for advanced EIP-712 signatures, implement ENS resolution for readable addresses, manage multi-chain interactions on Optimism and Arbitrum, strengthen security against front-running through simulations, code a cross-chain transfer DApp with verifications, and produce a personal dashboard tracking your secure transactions.

Module 4Events and Indexing with Web3.js 2026: Listening, Subgraphs, and IPFS (Data Decentralization)

Master real-time blockchain event listening with Web3.js 2026, integrate The Graph to index complex data, store metadata on IPFS for full decentralization, develop a listener for an NFT marketplace through a concrete case study, optimize queries for enterprise scaling, test with high-frequency streams, and deploy a functional prototype tracking live sales.

Module 5Advanced Projects with Web3.js 2026: Full-Stack DApps and Deployment (Vercel, Blockchain CI/CD)

Build a complete DeFi DApp with Web3.js 2026, integrate React for the UI and Node.js backend, deploy on Vercel with automated CI/CD, audit code for common vulnerabilities, simulate attacks and remediations, finalize with a deliverable portfolio certifying your professional skills, and prepare post-deployment monitoring for scalable enterprise applications.

Evaluation method

  • Daily interactive quizzes on Web3.js 2026 concepts.
  • Final DApp project evaluated by Qualiopi certified experts.
  • Competency attestation delivered at the end of the training.

Learning method

  • 70% hands-on practice on real Ethereum blockchain cases.
  • 30% theory with live Web3.js 2026 demos.
  • Groups limited to 10 for personalized coaching.
  • Unlimited access to resources and post-training replays.

Methods, materials and delivery

The Training Web3.js 2026 - Interacting with Ethereum Blockchains program is delivered onsite or remote (blended-learning, e-learning, virtual classroom, remote presence). At Learni, an industry-certified training organization, every program is built to maximize skills acquisition regardless of the chosen format.

The trainer alternates between demonstrative, interrogative and active methods (through hands-on labs and/or scenarios). This pedagogical approach guarantees concrete learning that's immediately applicable at work.

Equipment required

For the smooth delivery of the Training Web3.js 2026 - Interacting with Ethereum Blockchains program, the following equipment is required:

  • Mac or PC computers, high-speed fiber internet, whiteboard or flipchart, projector or interactive touch screen (for remote sessions)
  • Training environments installed on workstations or accessible online
  • Course materials, hands-on exercises and complementary resources
  • Post-training access to materials and educational resources

For intra-company training on a site outside Learni, the client commits to providing all required teaching materials (computers, internet, etc.) for the smooth delivery of the program in line with the prerequisites in the communicated program.

* contact us for remote delivery feasibility** ratio varies depending on the program

Skills assessment methods

Assessment of skills acquired during the Training Web3.js 2026 - Interacting with Ethereum Blockchains program is performed through:

  • During training: case studies, hands-on labs and professional scenarios
  • End of training: self-assessment questionnaire and skills evaluation by the trainer
  • After training: completion certificate detailing acquired skills

Program accessibility

Learni is committed to making its programs accessible. All our programs are accessible to people with disabilities. Our teams are available to adapt the pedagogical methods to your specific needs. Please contact us for any adjustment request.

Enrollment terms and lead times

Learni programs are available inter-company and intra-company, onsite or remote. Enrollments are possible up to 48 business hours before the program starts. Our programs are eligible for corporate funding paths. Contact us to discuss your training project and funding options.

Verified reviews

What our learners

4.9 · +100 verified reviews
★★★★★

« cool, j'ai appris des trucs »

TomFormation AWS — Cloud Practitioner
★★★★★

« j'etais perdu au debut mais Ramy Saharaoui m'a pas laché, il a pris le temps. merci vraiment »

Eva CarpentierFormation LLM en Entreprise — Claude, ChatGPT, Mistral
★★★★★

« la formation dev etait intense mais grave bien. merci Anthony Khelil »

NolanDWWM - Développeur Web et Web Mobile
★★★★★

« 😊👍 »

AmbreDWWM - Développement Web & Mobile React
★★★★★

« bien 👍 »

Léo BlanchardFormation AWS — DevOps Engineer Professional
★★★★★

« Allan Busi t'es au top, continue comme ça. formation géniale »

MargotFormation Claude & ChatGPT — Comparatif et Cas d'Usage
★★★★★

« cool, j'ai appris des trucs »

TomFormation AWS — Cloud Practitioner
★★★★★

« j'etais perdu au debut mais Ramy Saharaoui m'a pas laché, il a pris le temps. merci vraiment »

Eva CarpentierFormation LLM en Entreprise — Claude, ChatGPT, Mistral
★★★★★

« la formation dev etait intense mais grave bien. merci Anthony Khelil »

NolanDWWM - Développeur Web et Web Mobile
★★★★★

« 😊👍 »

AmbreDWWM - Développement Web & Mobile React
★★★★★

« bien 👍 »

Léo BlanchardFormation AWS — DevOps Engineer Professional
★★★★★

« Allan Busi t'es au top, continue comme ça. formation géniale »

MargotFormation Claude & ChatGPT — Comparatif et Cas d'Usage
★★★★★

« cool, j'ai appris des trucs »

TomFormation AWS — Cloud Practitioner
★★★★★

« j'etais perdu au debut mais Ramy Saharaoui m'a pas laché, il a pris le temps. merci vraiment »

Eva CarpentierFormation LLM en Entreprise — Claude, ChatGPT, Mistral
★★★★★

« la formation dev etait intense mais grave bien. merci Anthony Khelil »

NolanDWWM - Développeur Web et Web Mobile
★★★★★

« 😊👍 »

AmbreDWWM - Développement Web & Mobile React
★★★★★

« bien 👍 »

Léo BlanchardFormation AWS — DevOps Engineer Professional
★★★★★

« Allan Busi t'es au top, continue comme ça. formation géniale »

MargotFormation Claude & ChatGPT — Comparatif et Cas d'Usage
Read all reviews
Our method

Training quality, guaranteed at every step

Before, during, after: we frame the brief, introduce the trainer, tailor the content and measure impact. You stay in control from kickoff to wrap-up.

Step 1

Rigorous trainer selection

Each trainer is validated on three criteria: hands-on field expertise, proven pedagogy and alignment with your industry.

  • Triple validation: technical, pedagogical, sectoral.
  • Minimum rating 4.8/5 over the last 12 sessions.
Step 2

You meet the trainer beforehand

30-minute video call between you and the selected trainer to validate the fit, adjust content and clear any final doubts.

  • Live briefing on goals and team context.
  • Veto right — we swap the trainer for free if needed.
Step 3

Content tailored to your context

No recycled slides. The syllabus is reworked from your real cases: tools, constraints, vocabulary, ongoing projects.

  • Hands-on cases drawn from your stack and projects.
  • Program co-written then validated by your team.
Step 4

Continuous quality follow-up

Live evaluations, 30/90/180-day check-ins and a consolidation plan. If the impact misses the mark, we rework it.

  • NPS, knowledge quizzes and skills self-assessment.
  • Satisfaction guarantee: fully satisfied or free rework.

A simple promise: you don't pay to discover the trainer on day one. Everything is validated upfront, by you.

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