Backend Software Engineer
I'm a backend software engineer dedicated to building scalable systems, secure integrations, and innovative solutions, based in Quixadá, Ceará, Brazil. My primary focus is on architecting microservices within the Java ecosystem (Spring Boot) and developing decentralized applications (dApps) exploring Blockchain technologies (Stellar, Soroban, and EVM).
I am passionate about building highly efficient solutions, from robust API design to infrastructure deployment and optimization.
- Backend & Architecture: Java (17/21), Spring Boot, Spring Security, Microservices, RabbitMQ.
- Blockchain & Web3: Rust, Soroban (Stellar), Solidity, Hardhat, Chainlink.
- Frontend (Full-stack): TypeScript, React, Next.js, Node.js, Tailwind.
- Infra & Databases: Docker, MongoDB, SQL, Linux, n8n.
| Project | Description | Main Stack |
|---|---|---|
| COINCONUT | Decentralized impact ledger for reverse logistics of coconut shells with ESG Soulbound NFTs and PIX Oracle integration. | Solidity, React, TypeScript |
| SyloPay | Decentralized Buy Now, Pay Later solution built on Stellar with Soroban Smart Contracts and PIX on-ramp. | Rust, Soroban, TypeScript |
| Bible Web3 EVM | Complete DeFi and DAO ecosystem with ERC20 Token, Staking, Governance, and NFTs with Oracles. | Solidity, Hardhat, Chainlink |
| Bible Contract (Web3) | Rust Smart Contract for proof-of-reading and social dApp with tokenized rewards (TAL Token). | Rust, Soroban, Stellar |
| BTG Pactual Challenge | Order processing microservice with asynchronous event-driven architecture and structured messaging. | Java, RabbitMQ, MongoDB |
| Url Shortener | Scalable URL shortening API with expiration time support and containerization. | Java, Spring, MongoDB, Docker |
| Birthday Reports Auto | Automation and Web Scraping tool that extracts ERP data and generates consolidated PDF reports. | Java, Spring, Selenium, OpenPDF |
| DEMADEQ - Missionary Mgmt | Fullstack platform for congregational reporting management with a dynamic dashboard. | React, TypeScript, Supabase |
Tip: Check out my Practical Unit Testing Examples with JUnit 5 and feel free to explore my repositories.
Get in touch:
Feel free to reach out for collaborations in backend engineering and Web3!
- Portfolio: josias-batista-portfolio.vercel.app
- LinkedIn: https://www.linkedin.com/in/josias-batista/
- GitHub: https://github.com/josiasdev