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Open to smart contract roles · EVM & Solana
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Open to smart contract roles · EVM & Solana
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Achievement: QuickdrawAchievement: Pull Shark

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casaisdev/README.md

Martín Casais

Smart Contract Engineer · EVM & Solana
Stablecoin & payment infrastructure · security research

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Smart contract engineer building stablecoin and payment infrastructure across EVM and Solana since 2024. 18+ projects shipped. Private security review delivered (23 findings, all with PoCs) and 4 resolved findings (3 High, 1 Medium) in competitive audit contests.

Open to smart contract engineering roles: stablecoin & payment infrastructure.

Based in Galicia, Spain (CET). Remote, full-time or contract, comfortable with EU and US East overlap.

Selected work

  • StableGuard · Engineered a collateralized stablecoin from a core ERC-20 and 8 composable modules: MEV-resistant commit-reveal Dutch-auction liquidations, oracle with fallback feeds, repeg, rate limiter, and timelock, gas-optimized and covered by 443 unit, integration, and invariant tests.
    → Whitepaper · Code
  • AutonomiX · Built payment rails with on-chain agent identity: x402 USDC micropayments that paywall live APIs, plus an ERC-8004 registry with on-chain reputation. Contracts, backend, and frontend, shipped and verified on Base Sepolia.
    → Verified contract · Code · Live
  • MessageVault · Shipped an ERC-4337 smart-account dApp (EntryPoint v0.7) with Paymaster-sponsored gasless UX, EIP-191 UserOp validation, and The Graph indexing.
    → Verified contract · Code · Live
  • SolSplit · Built batch payment infrastructure on Solana that pays large recipient lists in single versioned v0 transactions using Address Lookup Tables.
    → Code · Live
  • StakeFlow · Built a Solana staking dApp in Anchor: SPL staking and reward accrual secured by PDA-managed vaults and a program-owned mint authority.
    → Code · Live

More at martincasais.com and labs.martincasais.com.

Security research

Private security review of a production protocol (2026): full manual review, 23 findings delivered, each with an executable proof of concept. Client and report not disclosed.

4 resolved findings (3 High, 1 Medium) in competitive audit contests (HackenProof, 2026). Rigor-first methodology: invariant and fuzz testing, forked-chain PoCs, and blind review calibrated against historical DeFi exploits. Foundry-based.

→ Verified profile: hackenproof.com/hackers/martincasais

Background

  • Product Engineer (AI & Automation) at PYH Global Services Holding, 2026.
  • BS Business & Technology, Universidade de Santiago de Compostela, 2026. Thesis on ML-based sentiment analysis applied to Solana price behavior.

Stack

Solidity Foundry Hardhat OpenZeppelin Halmos Solana Anchor TypeScript Next.js The Graph Docker

Elsewhere

Pinned Loading

  1. StableGuard StableGuard Public

    Modular, gas-optimized stablecoin protocol with oracle safety checks, Dutch auctions, and repeg mechanisms. Built with Foundry, StableGuard provides secure, composable DeFi primitives for on-chain …

    Solidity 1

  2. AutonomiX AutonomiX Public

    AutonomiX is a Web3 platform combining x402 micropayments and ERC-8004 agent NFTs for decentralized AI agents, on-chain reputation, and secure paywalled APIs on Base Sepolia.

    TypeScript 2 1

  3. StakeFlow StakeFlow Public

    StakeFlow is a high-performance Solana staking dApp built with Anchor and React, allowing users to stake SPL tokens, earn rewards, and manage assets effortlessly. It features an on-chain Rust progr…

    TypeScript 1

  4. MessageVault MessageVault Public

    MessageVault is a decentralized ERC-4337 smart account DApp that lets users store and emit on-chain messages with Account Abstraction, The Graph indexing, and a modern React frontend. Built using H…

    TypeScript 1 1

  5. SolSplit SolSplit Public

    SolSplit is a fast, secure Solana multi-send web app that efficiently distributes SOL to multiple recipients using Address Lookup Tables and batch v0 transactions, supporting large recipient lists,…

    TypeScript 1

  6. CryptoLens CryptoLens Public

    CryptoLens is a cutting-edge Web3 dashboard for exploring cryptocurrencies, tracking token prices, visualizing market trends, managing favorites, and linking wallets. Powered by Next.js, Supabase, …

    JavaScript 1