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.
Describe your need, get a tailored program and a pre-filled quote in 3 min. A 100% free call with an advisor.
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
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.
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.
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.
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.
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.
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.
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.
For the smooth delivery of the Training Web3.js - Master Ethereum DApps in 5 Days program, the following equipment is required:
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.
Assessment of skills acquired during the Training Web3.js - Master Ethereum DApps in 5 Days program is performed through:
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.
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.
« 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 »
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.
Each trainer is validated on three criteria: hands-on field expertise, proven pedagogy and alignment with your industry.
30-minute video call between you and the selected trainer to validate the fit, adjust content and clear any final doubts.
No recycled slides. The syllabus is reworked from your real cases: tools, constraints, vocabulary, ongoing projects.
Live evaluations, 30/90/180-day check-ins and a consolidation plan. If the impact misses the mark, we rework it.
A simple promise: you don't pay to discover the trainer on day one. Everything is validated upfront, by you.
Développement BlockchainIndustry-certified
Développement BlockchainIndustry-certified
Développement BlockchainIndustry-certified
Développement BlockchainIndustry-certified
Développement BlockchainIndustry-certified
Développement BlockchainIndustry-certified
Développement WebIndustry-certified
Développement WebIndustry-certified
Développement WebIndustry-certified
Développement WebIndustry-certified
Développement WebIndustry-certified
Développement WebIndustry-certified
CryptographieIndustry-certified
CryptographieIndustry-certified
CryptographieIndustry-certified
CryptographieIndustry-certified
CryptographieIndustry-certified
CryptographieIndustry-certified
Langages de ProgrammationIndustry-certified
Langages de ProgrammationIndustry-certified
Langages de ProgrammationIndustry-certified
Langages de ProgrammationIndustry-certified
Langages de ProgrammationIndustry-certified
Langages de ProgrammationIndustry-certified30 minutes with a learning advisor. No commitment. No sales pitch dressed up as a demo.