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.

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.
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
Without advanced Solidity expertise, your smart contracts expose you to massive hacks: 3.7 billion $ lost in 2022 on Ethereum alone.
Miss 80% of internal audits, incur external fees of 20-50k€ per contract, deploy with 2x more gas blocking DeFi scalability.
Competitors dominate with optimized L2, you stagnate on expensive mainnet.
Reentrancy or flashloan exploits drain treasuries: hacked DAOs lose 100% of funds.
Invest 28 hours or pay the high price in irreversible losses and missed opportunities.
Dive into the latest Solidity 0.8 features, explore expert design patterns like factories and delegates, code modular contracts with OpenZeppelin, complete exercises on proxies, produce a functional tested deliverable locally, while optimizing from the start for maximum efficiency.
Analyze and reduce gas via Hardhat benchmarks, implement optimized storage and inline assembly, track leaks with Slither, simulate high-load real cases, generate performance reports, transform your contracts into scalable machines ready for DeFi production.
Detect advanced reentrancy and oracle manipulation via manual audits, deploy Echidna fuzzing on your code, validate with formal verifiers, dissect famous hacks like Ronin (625M$), produce a complete audit report, secure your DApps against zero-day threats.
Deploy on Optimism/Arbitrum with upgradability, integrate Chainlink VRF for secure randomness, configure Gnosis Safe multisig, test cross-chain bridges, finalize a complete DeFi project deployed, leave with an expert toolbox to dominate the Ethereum ecosystem.
The Solidity Expert Training - Secure and Optimized Smart Contracts 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.
For the smooth delivery of the Solidity Expert Training - Secure and Optimized Smart Contracts 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 Solidity Expert Training - Secure and Optimized Smart Contracts 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 built for corporate L&D budgets and delivered onsite or remotely.
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.
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30 minutes with a learning advisor. No commitment. No sales pitch dressed up as a demo.