🎁Azure · AWS · Google — 1 free certification per learner, up to $400.Get the offer →
← Back

Training Web3.js - Master Ethereum DApps in 5 Days

Ref: HCL462
10 people max.
$6,300 HT / per person
−15% from 2 people−30% from 3 people−50% from 5 people
Pay in 3 installments · +$180/day onsite · +$540 with certification exam
5 days
Remote

Share in 2 clicks

EquansAptarArcelorMittalUbisoftINSEECLa PlateformeCESIEFREIEPSIINGETISMy Digital SchoolYnovEquansAptarArcelorMittalUbisoftINSEECLa PlateformeCESIEFREIEPSIINGETISMy Digital SchoolYnov

Learning objectives

  • Install and configure Web3.js with Ethereum providers
  • Manage accounts, private keys, and secure transactions
  • Interact with smart contracts via ABI and calls
  • Subscribe to events and blockchain logs in real-time
  • Develop and integrate frontend-backend DApps
  • Debug common errors and optimize gas fees
  • Deploy Web3 applications on live testnets

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 mastering Web3.js, 65% of DApps fail blockchain integration, gas fees explode by 200-500% on poorly optimized transactions, exposing you to hacks like the $3 billion lost in 2023 via contract vulnerabilities.

  • Your projects stagnate against a Web3 market growing 250% annually, while competitors deploy scalable DApps and you miss freelance opportunities at 80€/h.

  • Avoid deployment delays, protect user funds, and boost your career today with our certified experts.

Allan Busi
Allan Busi

Learni Trainer · Expert

73%productivity gap
×3cost of inaction

Program

Module 1Web3.js Fundamentals: Installation, Providers, and First Blockchain Interactions

Dive into Web3.js by installing the library via npm, configure Infura and Alchemy providers to connect to Ethereum nodes, perform practical exercises reading ETH and ERC20 token balances on Sepolia testnets, create your first automated scripts that query the blockchain live, obtain deliverables like a basic network stats dashboard, all to boost your immediate confidence.

Module 2Web3.js Accounts and Transactions: Signatures, Sending, and Monitoring

Master Web3.js account management by importing private keys, sign and send ETH/ERC20 transactions via real exercises on Goerli, simulate gas estimations to avoid overcosts, integrate MetaMask for interactive wallets, develop an automated transfer bot with confirmation callbacks, produce deliverables like a reusable transactional module, experience the thrill of secure live transactions.

Module 3Web3.js Smart Contracts: ABI, Read/Write Calls, and Deployments

Dive into ABIs to instantiate Solidity contracts with Web3.js, practice gas-free read-only calls and write transactions, deploy simple contracts from Node.js scripts on Remix, code complex interactions like NFT minting via guided exercises, test on mainnet forks, generate deliverables such as a full-stack contract client, feel the power of controlling DeFi live.

Module 4Web3.js Events and Filters: Real-Time Listening and Data Streams

Subscribe to smart contract events using Web3.js filters and WebSocket subscriptions, capture transfer/approval logs live on Polygon Mumbai, analyze data via ABI decoding, integrate into React apps for dynamic UI updates, practice on real cases like trading alerts, produce an interactive events dashboard as a deliverable, discover the magic of real-time blockchain.

Module 5Advanced Web3.js DApps: Integration, Debugging, and Optimization

Build a complete Web3.js DApp with Vue.js frontend and Express backend, optimize batch calls to reduce latency, debug provider/ABI errors via console and logs, secure against reentrancy, deploy on Vercel with IPFS pinning, finalize with a personal capstone project evaluation, leave with a pro portfolio and certificate, ready to conquer Web3.

Evaluation method

  • Daily practical quizzes
  • Final certifying DApp project
  • Live code reviews

Learning method

  • 80% hands-on practice on real testnets
  • Hands-on exercises with MetaMask
  • Real-world DeFi and NFT cases

Methods, materials and delivery

The Training Web3.js - Master Ethereum DApps in 5 Days 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 - Master Ethereum DApps in 5 Days 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 - Master Ethereum DApps in 5 Days 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

Registration is possible up to 48 business hours before the start of training. All our programs are eligible for corporate training budgets and employer-funded plans.

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.

Your professional training, anywhere

Let's build
your next
program.

30 minutes with a learning advisor. No commitment. No sales pitch dressed up as a demo.

Reply within 24 h · Industry-certified · Corporate funding
WhatsApp