I bridge business needs and engineering. After a senior pre-sales/architecture track, I moved into hands-on development to build Web3 dApps and full-stack systems focused on real outcomes.
- Focus: Web3 (Solidity, ZK — Circom) + Full-stack (Next.js/React/TypeScript)
- Also: Hyperledger Fabric on Azure, Docker, wagmi/viem, ethers, Hardhat/Foundry
- Strength: self-learner, turning vague requirements into clear specs and working software
- Mode: remote/hybrid · open to relocation with sponsorship
- Languages: English, Spanish (native)
ZKPPROOF-CREDITAPP — 2025 · React | Circom Demo app that proves an employee’s salary is above a creditor’s minimum without revealing the actual amount. UI scaffolded with Lovable, then extended and reviewed by me. Verifying Contract deployed on Sepolia (0xAd0fB84F188DF7Bb7A889FFC734739f34bBA2a14) to validate ZK Proofs • Repo: Client · server
RFP/Tender dApp on Polygon — 2022 (extended/migrated in 2023) · Next.js | Solidity | Hardhat | Bundlr → Irys | MongoDB
Blockchain-based RFP & Tender manager. Secure process flow with client-side encrypted files uploaded via Irys (ex-Bundlr). Deployments to Mumbai/Amoy (testnets) and Polygon mainnet.
• Repo: Client · Contracts
Gubbi Pay — Exchange Contract — 2024 · OpenWeb Frutal WH ETHMexico Hackathon · Solidity | OpenZeppelin | Pangolin | Foundry on Avalanche Fuji (Award: Avalanche recognition)
Smart Contracts to programmatically swap assets (via Pangolin, a Uniswap-type DEX on Avalanche) for treasury balancing.
• Repo: Contracts
• Hackathon: Project page
RWA Gubbi Contract (ERC-1155) — 2024 · Base LATAM Hackathon · Solidity | OpenZeppelin on Base Sepolia (Award: Community Mention)
ERC-1155 issuance/tokenization to enable lending with asset-backed guarantees involving issuers, enforcement agents and buyers.
• Repo: Contracts
• Hackathon: Project page
NFTs for Education (ERC-721) — 2022 · solidity | Hardhat | React | Google Sheets API Deployed to Matic (Polygon)
NFT minting app where donors support students by minting NFTs tied to their physical paintings, registering physical address to receive them
• Repo: Code
Blockchain for Retail — Executive Course + Demo — 2024 · Next.js | Solidity
Video Course for Executives. Curriculum covering architecture, technical fundamentals, use-case validation with a blockchain use-case selection matrix, and IT implementation considerations, plus a dApp where attendees sign quiz answers with a wallet
• Repo: Client · Contracts · Course
Retail Tickets on Hyperledger Fabric (Azure) — 2018 · Express | React | Hyperledger Fabric
Immutable ticket registry for audits, featuring a Fabric contract deployed to IBM Blockchain, server infrastructure on Azure, and a local development environment in Docker
• Repo: Client & server
Health Club — 2021 · React | Firebase
Web app for managing patient records (vitals, custom catalogs, PDFs, treatment notes).
No HL7/IHE/FHIR — custom data model by request.
• Repo: Project On request · Demo Videos
Solidity · Next.js/React/TypeScript · Tailwind · wagmi/viem · ethers · Hardhat/Foundry · Polygon · Hyperledger Fabric · Docker · Circom (foundational POCs) · MongoDB
- Prototyping Machine Learning & Smart Contract application on Retail Industry
- Exploring ZK proof patterns (Circom) and zkTLS-adjacent ideas for privacy-preserving identity and credential checks in Retail/Legal Industries
- Building a HIIT timer PWA (Next.js/TypeScript/Supabase). Built with AI-assisted development and human-in-the-loop review
- Email: [email protected]
- LinkedIn: https://linkedin.com/in/roberto-vicuna
- X: https://x.com/RoberVH
- Location: Mexico City (CDMX), Mexico · Remote
