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.
Learning objectives
- Master the Web3.js API for interacting with EVM-compatible blockchains
- Develop secure connections to Ethereum nodes and wallets
- Implement read and write calls and transactions to smart contracts
- Manage blockchain events and real-time data indexing
- Design performant DApps integrating Web3.js in enterprise projects
- Optimize the security and performance of Web3 applications
- Deploy scalable blockchain solutions with professional skills
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.
Program
Module 1Web3.js Fundamentals: Setup and Connection to Blockchains (Ethereum, Providers)
Installation of Web3.js in a Node.js or browser project, configuration of providers like Infura or Alchemy for reliable connections to testnets, initial scripts to read the blockchain and query the latest block number, practical exercises on retrieving Ethereum account information, creation of a secure development environment using dotenv for API keys, initial unit tests to validate connections in a professional context.
Module 2Web3.js and Smart Contracts: ABI, Read and Write Calls (Comparison with ethers.js)
Loading ABIs of deployed contracts via Web3.js, performing static read calls like balanceOf or totalSupply on ERC20 tokens, sending signed transactions with web3.eth.sendTransaction for transfers, integration with MetaMask for local signing, practical case of interacting with an NFT marketplace contract, debugging common errors like gas estimation, production of a reusable automated script for enterprise projects.
Module 3Web3.js Events: Listeners, Filters, and Real-Time Indexing (TheGraph Intro)
Subscribing to contract events with web3.eth.subscribe to track Transfer or Approval events live, filtering by addresses or topics for performance optimization, parsing decoded logs with ABI, integration into a React DApp for a real-time blockchain dashboard, exercises on indexing thousands of historical events, comparison with TheGraph subgraphs, development of a robust persistent listener for professional enterprise monitoring.
Module 4Advanced DApps with Web3.js: Frontend Integration and State Management (React/Vue)
Seamless integration of Web3.js with a modern frontend using custom hooks, decentralized state management with user accounts and dynamic balances, implementation of an interface for minting and trading ERC721 tokens, end-to-end testing with Cypress on blockchain interactions, bundle optimization for mobile Web3, capstone project of a complete decentralized marketplace, focus on intuitive UX for widespread adoption.
Module 5Web3.js Security and Deployment: Audits, Optimization, and Production (Hardhat, IPFS)
Analysis of common vulnerabilities like reentrancy via Web3.js calls, implementation of multisig and slippage protection for transactions, deployment to mainnet with automated scripts and gas monitoring, decentralized hosting of a DApp via IPFS and ENS, simulated audit of your capstone project with Slither tools, performance optimization to scale to 1000+ users, post-deployment maintenance plan for enduring enterprise skills.
Evaluation method
- Multiple-choice quiz (MCQ) to validate Web3.js skills at the end of the training
- Continuous assessment through practical blockchain exercises
- Defense of the capstone DApp project before the expert trainer
Learning method
- Courses led by an active blockchain expert trainer
- Practical exercises based on real enterprise Web3 cases
- Progressive capstone project integrating Web3.js
- Complete course materials and source code provided to each participant
Methods, materials and delivery
The Training Web3.js - Integrating Blockchain into Your Web Apps 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 - Integrating Blockchain into Your Web Apps 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 - Integrating Blockchain into Your Web Apps 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
★★★★★
« cool, j'ai appris des trucs »
★★★★★
« j'etais perdu au debut mais Ramy Saharaoui m'a pas laché, il a pris le temps. merci vraiment »
★★★★★
« la formation dev etait intense mais grave bien. merci Anthony Khelil »
★★★★★
« 😊👍 »
★★★★★
« bien 👍 »
★★★★★
« Allan Busi t'es au top, continue comme ça. formation géniale »
★★★★★
« cool, j'ai appris des trucs »
★★★★★
« j'etais perdu au debut mais Ramy Saharaoui m'a pas laché, il a pris le temps. merci vraiment »
★★★★★
« la formation dev etait intense mais grave bien. merci Anthony Khelil »
★★★★★
« 😊👍 »
★★★★★
« bien 👍 »
★★★★★
« Allan Busi t'es au top, continue comme ça. formation géniale »
★★★★★
« cool, j'ai appris des trucs »
★★★★★
« j'etais perdu au debut mais Ramy Saharaoui m'a pas laché, il a pris le temps. merci vraiment »
★★★★★
« la formation dev etait intense mais grave bien. merci Anthony Khelil »
★★★★★
« 😊👍 »
★★★★★
« bien 👍 »
★★★★★
« Allan Busi t'es au top, continue comme ça. formation géniale »
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.
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.
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.
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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