Sonia Batista

Sonia Mara Batista Executive Summary ●​ Developer with more than 25 years of experience in software development, starting with specialization in Java and, in recent years, focusing on Web3 and Blockchain. Previously acted as CTO in a real estate tokenization startup and graduated from the SheFi program. ●​ I recently participated as a speaker at Web3 and Blockchain events, including TokenNation and TDC (The Developers Conference) in São Paulo. I was also invited to speak at the Technology Week of FATEC Zona Sul, where I presented the talk “Blockchain Beyond Cryptocurrencies: Career Opportunities”. Also, I have actively participated in hackathons, contributing innovative blockchain solutions that demonstrate my ability to deliver impactful projects and reinforce my engagement in industry events. ●​ In addition to my experience in software development and project management, I have experience in training and user support. Self-taught with a predisposition to learn. Ease of integration, dynamism, interpersonal relationships, organization, and ease in teamwork. My Blockchain projects can be found on my GitHub. Professional Experience ●​ Self-Employed Blockchain/Web3 Specialist ​ October 2025 – Present​ I work as a Full-Stack Engineer in Blockchain/Web3, continuing to develop decentralized applications and platforms based on smart contracts, while expanding my involvement in AI-driven automation. My focus is on developing scalable and secure systems that integrate Web3 infrastructure with intelligent workflows, optimizing operations and unlocking new digital efficiencies. I design and develop end-to-end solutions—from smart contracts and backend services to responsive front-end interfaces—applying blockchain and artificial intelligence to deliver transformative next-generation product experiences. ●​ Firmeza Token - Co-Founder and CTO​ May 2024 – October 2025​ As CTO, I led the technical vision and architecture of a blockchain-based real estate model in Brazil, designing systems that allow fractional ownership of properties and gradual acquisition mechanisms. Development of smart contracts, platform scalability, and secure wallet integrations, aligning engineering priorities with product needs, regulatory requirements, and business objectives. My work focused on transforming complex real estate and compliance flows into simple and fluid digital experiences, expanding access to real estate investment and ownership opportunities through distributed technology. ●​ Self-Employed Blockchain/Web3 Developer​ September 2023 – April 2024​ Development of smart contracts on the Ethereum blockchain using Remix, Foundry, HardHat, and OpenZeppelin. Deployment of contracts on Testnet networks, including Sepolia, Avalanche Fuji, Scroll, Amoy, Chiliz. Building DApps for interaction with smart contracts, using libraries such as Web3.js, Ethers.js, React.js, and Next.js. Use ●​ ●​ ●​ ●​ of scaffold for quick project initialization, integrating libraries like daysiui and wagmi. Configuration and deployment of DApp applications in production using Vercel. VR Benefícios - IT Specialist – Java Developer​ São Paulo, Brazil​ September 2021 – July 2023​ Maintenance and Development of REST APIs in Java. Data analysis in Oracle. Creation of monitoring using Grafana. GetNet Tecnologia - IT Specialist – Java Developer​ São Paulo, Brazil​ May 2011 – September 2021​ Active participation in the implementation and responsible for the maintenance of a Recurring Payment system in Web and Linux environments (stand-alone). Creation of Unix scripts. Implementation of an agile team (reports, dashboards in Jira). Integration of systems with user approval/permission using Active Directory. Project Management by Software Factory. Maintenance and Development of REST APIs, involving the entire development cycle and delivery in Production (SpringBoot, Maven, Oracle Database, Unit and Functional Tests, Tests in Postman, Jenkins, Sonar Test Coverage, OpenShift, ELK-Kibana, Monitoring by AppDynamics), Migration of legacy systems to updated technology environments. HP (Hewlett Packard Enterprise) - Senior Java​ Córdoba, Argentina​ April 2009 – April 2011​ American Airlines Project (http://www.aa.com) - Maintenance of applications, from analyses, coding, testing, code review. Development in WEB technologies, using Jakarta-Struts framework, interacting with BEA-Weblogic Application Server, using JUnit for tests, Starteam for version control. Trips to the USA for training and interaction with clients (AA). EDS (Electronic Data System) - Senior Java​ São Paulo, Brazil​ June 2000 – April 2009​ Projects: GMAC (USA) / Financial Tools (USA) – Banco GM (Brazil). Project Analysis and Design. Implementation of Websites using J2EE, Javascript, HTML, CSS, EJB, Design Patterns, JUnit Tests. Extensive experience using Oracle Database and Stored Procedures-PL/SQL. Projects and Hackathons ●​ Lumx Hackathon - 7th place among more than 20 projects - Project Oly​ May 2024​ Construction of Smart Contract in Solidity. Project focused on the Olympic athletes community. Being an NFT platform, allowing fans to interact with their favorite athletes and athletes to receive financial support.​ Link: https://github.com/DevSoniaBatista/lumx_blockchain ●​ Lumx Hackathon – Polygon Partner - 1st place - Project Oly​ May 2024​ With the same project supporting Olympic athletes, but responsible for building the Smart Contract, also in Solidity with deployment on the Polygon Cardona network and frontend using the Scaffold framework, with VERCEL implementation.​ Link: https://github.com/DevSoniaBatista/oly-polygon ●​ NearX Hackathon - 8th place among more than 40 projects - Project BlockStay​ March 2024​ Construction of smart contracts and a basic front end. The project idea was to create Hotel Package Contracts on the Blockchain as tokens, with metadata specifying the room photo, dates, and particularities, having an administrative part for package creation by the Hotel owner and user access to make reservation, payment, or cancellation of reservation, check-in and check-out via blockchain.​ Link: https://github.com/DevSoniaBatista/hackNearx-BlockStay ●​ Startup Weekend Fintech - 1st place - Project Mercado Carbon​ October 2023​ Idea to create a startup to operationalize the production and distribution of Carbon Credits, controlled via Smart Contracts, ensuring the existence and control of credits.​ Site: https://mercadocarbon.godaddysites.com ●​ Startup Weekend Impact (Sustainability) - 3rd place - Project Super Pancs​ June 2023​ Idea to create a startup of a marketplace for PANCs (non-conventional food plants). Education ●​ Graduation: Bachelor's Degree in Data Processing – Faculdades Santa Rita de Cássia – 1999 ●​ Post-Graduation: Course: Java Enterprise/WebServices Component Engineering FIAP – 2004 ●​ Extension: Course: Main Architectures and Protocols of the Internet of Things/IoT – PUC – 2018 ●​ Extension: Course: Digital Currency – University of Nicosia – 2024 ●​ Extension: Course: Optimism Blockchain Network: Governance and Retroactive Incentives – Federal University of Rio de Janeiro – UFRJ – 2024 ●​ Extension: SheFi Graduation – Web3-Blockchain – Online - 2024 ●​ Extension: Legal HackBuilders: Law & Smart Contracts in Practice – Web3-Blockchain – Online - 2025 Certifications ●​ Blockchain: Solidity - Creation of Smart Contracts with Solidity – Front-End Integration ●​ Language: Certificado de Calificación Español - SIELE GLOBAL ●​ Agile: Scrum Master (International Scrum Institute) and Product Owner (International Scrum Institute) Languages ●​ Portuguese: Native ●​ English: Intermediate ●​ Spanish: Fluency – 2-year experience in Córdoba, Argentina, and International Certification - SIELE Technical Skills ●​ Full Stack Blockchain/Web: Creation of Smart Contracts in Solidity language, in Foundry, HardHat, Remix, and Deployment on main compatible EVMs, as well as use of OpenZeppelin libraries. Front-end Integration with Web3.js, Ethers.js, React.js, and Next.js libraries. Scaffold framework, DApp Implementation using Vercel. ●​ Development Environments: Linux/Unix ●​ GitHub for code version control, team collaboration, repository management, and Continuous Integration and Continuous Delivery/Deployment. ●​ Backend Development with Node.js, including creation of RESTful APIs using the Express framework. ●​ Modeling and management of NoSQL database with MongoDB, including integration with Node.js applications and CRUD operations using Mongoose. ●​ Management Tools: Jira, Confluence, Microsoft Project, Word, PowerPoint, Advanced Excel, Trello. ●​ Java Specialist: Development and Support Tools: Rest APIs, SpringBoot, Maven, Jenkins, Sonar, BitBucket, Openshift, Struts Framework, J2EE, Servlets, EJB, Java Server Pages, JavaScript, HTML, sFTP, Active Directory, JUnit tool. ●​ Development IDEs: Eclipse Marketplace, IntelliJ. ●​ Database: Oracle, Sybase, MySQL, stored procedures (PL-SQL), JDBC, DataSource, and Connection Pool.