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Alejandro Saez Castells

Blockchain / Smart Contracts (Solidity) • Full-Stack Engineer • Industrial Automation background

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About me

I’m a Full-Stack Software Engineer with a strong background in Industrial Automation & Controls and a current focus on Blockchain engineering (smart contracts, DeFi, and security).
I like building production-ready systems: clear specs, strong testing, and measurable outcomes.

  • 🧱 Building smart contracts & dApps (Solidity, ERC standards, DeFi primitives)
  • 🛠️ Experience delivering automation projects in the car manufacturing industry across Europe
  • 🎓 In a Blockchain Accelerator: +15 hands-on projects (DEX, tokens, marketplaces, swaps, LPs, yield farming, lending/borrowing, security)
  • 🏆 Hackathon winner: “Blockchain-based turnaround checklist” (Camino Network × Vueling) — on-chain task tracking, SLA/KPIs & ERC-721 badges

What I’m looking for

Blockchain / Smart Contract Engineer roles where I can ship real product, improve protocol safety, and help teams move fast with confidence.


Tech stack

Blockchain: Solidity • Foundry/Hardhat • EVM • ERC-20 / ERC-721 • DeFi (AMMs, LPs, lending) • Security mindset
Backend: Java • Spring • .NET • Python • REST APIs
Frontend: React • TypeScript • Web3 wallet integrations
Industrial: PLCs • SCADA • OT/IT integration (automation & controls)

Solidity Ethereum Foundry OpenZeppelin Hardhat
Java Spring Node.js PostgreSQL MongoDB GraphQL Docker
Python React TypeScript


Highlight project (Hackathon)

On-chain flight turnaround checklist (Camino Network × Vueling)
Smart contract per flight turnaround: task assignments, on-chain completion, deadlines/SLA logic, KPI computation, and a turnaround certificate hash.
Bonus: ERC-721 “TurnaroundBadge” NFTs minted for top performers (IPFS metadata/images).

If you’re building in web3, DeFi, or tokenized incentive systems, I’m happy to connect.


Featured projects (Blockchain)

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