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.
1 seat held for the next session
30:00Held for another
Request a call back and an advisor reaches you within 24 business hours, Monday to Saturday.
Trusted by — schools, companies and industrial groups
Every program built with a dedicated engineer
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
Our social commitment
A school kit donated to a child for every training booked
To fight inequalities in access to education, Learni donates a complete school kit to a child in need for every training booked. You build your skills, a child heads back to school.
- Backpack, notebooks and essential supplies
- Distributed through our partner charities
- Included, at no extra cost to you
The Learni story
Founded by engineers and learning experts, Learni's mission is to make high-impact tech training accessible to teams everywhere. We work remotely with organizations across the US and Canada, in your time zone, to help teams upskill fast.
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.
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, 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 built for corporate L&D budgets and delivered onsite or remotely.
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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FAQ
Frequently asked questions
What can participants do after Web3.js training?+
They can install and configure Web3.js with Ethereum providers, manage accounts, private keys, and secure transactions and interact with smart contracts via ABI and calls. Those are the stated objectives of the Web3.js program at Intermediate level, checked by the end-of-session assessment.
What does the Web3.js program cover, day by day?+
Day 1: Web3.js Fundamentals: Installation, Providers, and First Blockchain Interactions. Day 2: Web3.js Accounts and Transactions: Signatures, Sending, and Monitoring. Day 3: Web3.js Smart Contracts: ABI, Read/Write Calls, and Deployments. Day 4: Web3.js Events and Filters: Real-Time Listening and Data Streams. Day 5: Advanced Web3.js DApps: Integration, Debugging, and Optimization. The Web3.js program runs over 5 days, delivered on site.
How is Web3.js training assessed?+
Assessment relies on daily practical quizzes, final certifying DApp project and live code reviews. Learni issues a completion certificate together with the individual assessment report at the end of the Web3.js program, which an L&D team can file as evidence.
How much does Web3.js training cost per participant?+
$5,775 (USD) per participant. A detailed quote is sent within one business day, and team pricing applies from the second participant.
How long does Web3.js training take?+
5 days, available live online (US time zones) or on-site at your offices. Half-day tracks spread over several weeks are possible so the team stays operational.
Who pays for Web3.js training?+
Most US teams pay directly through their company L&D or training budget. Learni invoices in US dollars and accepts bank transfer (ACH/wire) or card, with volume pricing for teams. A purchase order is welcome.
What do participants need to know before Web3.js training?+
Mastery of JavaScript ES6+, basic knowledge of Ethereum and smart contracts, Node.js installed.
Is a certificate issued after Web3.js training?+
Yes. A Learni completion certificate is issued, along with the individual evaluation report. Learni is a certified training provider and prepares for third-party certifications, but does not award them itself.
Does Learni provide the equipment for Web3.js training?+
No. A computer and a stable internet connection are required for each participant. Learni provides the learning platform, the trainer and all course materials.
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