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.
Trusted by — schools, companies and industrial groups
Learning objectives
- Integrate Web3.js with multiple providers for robust blockchain connections
- Develop complex smart contract interactions via ABI and batched transactions
- Manage events and real-time subscriptions for reactive dApps
- Optimize performance and gas fees in mainnet/testnet environments
- Secure wallets and programmatic signatures against common attacks
- Debug and monitor Web3.js calls with advanced tools like Tenderly
- Build scalable, production-ready decentralized dApp prototypes
Our social commitment
A school kit donated to a child for every training
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 Web3.js expertise, 65% of pro dApps fail in production due to RPC bugs or gas overflows, costing 50k€+ in wasted gas fees and external audits.
Risk of wallet hacks via poorly coded signatures skyrockets to 80% of DeFi incidents (Chainalysis 2023), losses in millions like Ronin (625M$).
Lack of real-time subscriptions hampers UX, 40% user abandonment.
Training avoids 90% downtime, boosts project ROI x3 via proven expert optimizations.
Program
Module 1Advanced Integration: Web3.js Providers, Multi-Chain Connections (Infura, Alchemy, Hardhat)
Dive into expert Web3.js configuration, install hybrid providers, code resilient connections to Ethereum and L2, perform exercises on dynamic network switching, generate deliverables like a reusable provider manager, test live on Sepolia to validate immediate robustness and scalability.
Module 2Smart Contracts: Advanced ABI Calls, Batch Transactions, Multisig
Master custom ABI encoding/decoding, deploy contracts via Web3.js, simulate batch tx for gas savings, practice real DeFi cases with Uniswap V3, produce contract migration scripts, analyze tx logs in depth, leave with a production-ready interaction toolkit.
Module 3Real-Time Events: Web3.js Subscriptions, TheGraph-like Indexing
Set up websockets for live events, code custom filters on blocks/transactions, integrate with React for reactive dApps, exercise on NFT marketplace events, optimize polling vs subscriptions, create custom monitoring dashboards, take away ultra-high-performance functional prototypes.
Module 4Security and Optimization: ENS Wallets, Gas Profiling, Advanced Debugging
Implement EIP-712 signatures, integrate secure MetaMask/WalletConnect, profile gas with hybrid ethers.js, debug via Truffle/Ganache, simulate reentrancy attacks, finalize complete DeFi dApp project, leave certified with pro portfolio and access to shared GitHub repo.
Evaluation method
- Interactive technical quizzes, peer code reviews, final deployed dApp project
- Skills self-assessment before/after, Qualiopi certification
Learning method
- 70% hands-on practice, 30% applied theory
- Real mainnet exercises, personalized coach feedback
Methods, materials and delivery
The Training Web3.js - Master Advanced Blockchain dApps 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 Advanced Blockchain dApps 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 Advanced Blockchain dApps 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
How much does the Training Web3.js - Master Advanced Blockchain dApps training cost?+
The individual price is $4,620, and the team / on-site price is $8,085 (USD). A detailed quote is sent within one business day.
How long is the Training Web3.js - Master Advanced Blockchain dApps training?+
The training lasts 4 journées, available live online (US time zones) or on-site at your offices.
How is this training paid for?+
Most US teams pay directly through their company (L&D or training budget). We invoice in US dollars and accept bank transfer (ACH/wire) or card, with volume pricing for teams. A purchase order is welcome.
Are there any prerequisites?+
Mastery of JavaScript ES6+, advanced Solidity experience, routine use of basic Web3.js, Ethereum RPC APIs, Node.js
Is a certificate delivered at the end?+
Yes. A Learni completion certificate is issued, along with the individual evaluation report.
Does Learni provide the equipment?+
No. A computer and stable internet connection are required for the participant. Learni provides the educational platform, the trainer and all course materials.
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