👋 Hello, I’m Helder (@Helder77270)
Blockchain & Smart‑Contract engineer passionate about teaching web3 and building it !.
- 🔭 I’m currently developing upgradeable UUPS/ERC‑1967 betting hubs (
MatchHub,SportsBet) in Solidity using Foundry. - 🌱 I’m diving deep into XRPL (Escrow, Wallet integration) with TypeScript & React.
- 👯 I’m open to collaborating on cool & sustainable projects
- 💬 Ask me about on‑chain randomness, UUPS proxies, or how to fuzz‑test with Forge.
- 📫 How to reach me: via GitHub Issues or Discussions on my repos.
🔹 Languages & Frameworks
- Solidity (0.8.x) — Upgradeable contracts, ReentrancyGuard, UUPS
- Foundry (forge, cast) — Tests, fuzzing, scripts, coverage
- TypeScript & JavaScript — Front‑end integration (Next.js, React, Wagmi)
- Rust / Anchor — Solana on‑chain programs
🔹 Libraries & Protocols
- OpenZeppelin (contracts & upgradeable)
- Chainlink VRF for provable randomness
- xrpl.js — XRPL Client, Wallet, Escrow
- Kayen (Uniswap‑V2 style) router on Chiliz / Socios chain
🔹 Tools & Security
- Slither & MythX — static analysis & auditing
- Hardhat & Truffle — alternative dev environments
| Repo | Description |
|---|---|
| chiliz-betting | UUPS‑upgradeable “SportsBet” and “MatchHub” factory on Chiliz / Socios testnet |
| xrpl-escrow-ui | React/Next.js dApp to connect XRPL wallet, create & manage escrows (with TypeScript & Tailwind) |
| Mini Marketplace for teaching Solidity | Forge tests & sample contracts demonstrating reentrancy, overflow/underflow protection, custom errors |
| Trackin- | Rust/Anchor program for minting and metadata on Solana via Metaplex Token Metadata v3 |
- 🌐 Portfolio (coming soon)
“Building transparent, secure, and upgradeable on‑chain systems—one block at a time.”