Blockchain Developer & Protocol Engineer | Java & Spring Boot Backend Specialist
I am a Software Engineering student at the Federal University of Ceará (UFC Quixadá) and a Web 3.0 Resident Developer at iRede. Based in Quixadá, Ceará, Brazil, I specialize in engineering decentralized protocols, high-assurance Smart Contracts, and scalable backend microservices.
My primary technical focus centers on Solidity (EVM), Rust & Soroban (Stellar Network), Zero-Knowledge proofs (Noir), Foundry, DeFi Primitives, and Java 17/21 (Spring Boot) architectures.
- 🌐 Portfolio Site: josias-batista-portfolio.vercel.app
- 💼 LinkedIn: linkedin.com/in/josias-batista
- 📁 GitHub Repositories: github.com/josiasdev
- ✉️ Email: josiasmartins098@gmail.com
- 📱 Phone: +55 (85) 98231-7976
- 📍 Location: Quixadá, Ceará, Brazil
- Web3 & Blockchain: Solidity (EVM), Rust, Soroban (Stellar), Noir (ZK Proofs), Foundry, Hardhat, W3C Verifiable Credentials, DeFi Primitives.
- Backend & Engineering: Java 17/21, Spring Boot, Spring Security, Microservices, Node.js, NestJS, TypeScript, Python (RAG / AI Agents), RabbitMQ, REST APIs.
- Databases & DevOps: PostgreSQL, MySQL, MongoDB, Docker, Git, GitHub Actions, Linux (LPI), Vercel.
- Agile & Architecture: Scrum, Kanban, Clean Architecture, Domain-Driven Design (DDD), QA & Software Testing.
- 🥇 PULSO Hackathon (Stellar Network 2026): Project COINCONUT — Impact ledger for reverse logistics of coconut waste built on Stellar Soroban with ZK Proofs (Noir) & ESG Soulbound NFTs.
- 🥈 UNICEF Youth Challenge Blockchain 2026 (UNICEF Brasil & Blockchain.RIO): Project EloCiv — Decentralized W3C Verifiable Credentials platform on Stellar Soroban for youth civic history.
- 🏅 Hack Meridian 2025 (Stellar Network): Project SyloPay — Decentralized BNPL (Buy Now, Pay Later) protocol on Stellar blockchain.
- 🥉 HackaLedger XRPL 2024: 3rd Place Web 3 Track with AI tutor integration on XRP Ledger.
| Project | Description | Tech Stack |
|---|---|---|
| COINCONUT | Decentralized impact ledger on Stellar certifying coconut waste reverse logistics into ESG Soulbound NFTs with Noir ZK proofs and PIX off-ramp. | Stellar, Soroban, Rust, Noir ZK, TypeScript |
| EloCiv | Decentralized Web3 platform for UNICEF Youth Challenge 2026 anchoring W3C Verifiable Credentials for youth civic engagement onto Stellar Soroban smart contracts. | Stellar, Soroban, Rust, W3C VC, TypeScript |
| SyloPay | Decentralized Buy Now, Pay Later (BNPL) protocol built on Stellar with Soroban Smart Contracts and instant merchant settlement. | Rust, Soroban, NestJS, Docker, TypeScript |
| ChainMed | Blockchain medical prescription ecosystem that revolutionizes how doctors prescribe and patients manage medications with EVM immutability. | Solidity, EVM, React, TypeScript |
| Kyra DeFi AI Agent | AI agent specialized in DeFi yield strategies, acting as an on-chain analyst for lending, staking, and swaps on SUI Network. | SUI, Next.js, TypeScript, DeFi AI |
| BTG Pactual OrderMS | Event-driven order processing microservice with asynchronous messaging and high throughput. | Java 17, Spring Boot, RabbitMQ, MongoDB |
| Birthday Reports Auto | Web Scraping and automated reporting system that extracts ERP member data, formats PDF reports, and dispatches via WhatsApp API. | Java 17, Spring Boot, Selenium, OpenPDF |
Feel free to explore my repositories or get in touch for collaborations in Web3 & Backend Engineering!