• System Architecture & Design: Lead the design and implementation of scalable and maintainable systems, ensuring alignment with business requirements and technical standards. • Development & Coding: Write efficient and maintainable code using Node 20 LTS (back-end), Next 15+ (Backend + Front end), React 19+, React Native 0.80+, and Expo SDK 54+ technologies, following best practices for software development, including test-driven development and continuous integration. Primary focus will be on backend services, RESTful API development, Next.js API routes, and SQL database design and optimization. • Backend & Database Development: Design and optimize SQL database schemas, write complex queries, and implement ORMs (Prisma, TypeORM, Sequelize, or similar). Build and maintain robust backend services using Express.js, Fastify, or similar Node.js frameworks. • API Design & Documentation: Create well-documented RESTful APIs using OpenAPI/Swagger specifications, ensuring consistency and ease of integration for frontend and mobile applications. • Technical Leadership: Provide technical guidance and mentorship to junior engineers, conducting code reviews, and ensuring adherence to established coding standards and practices. • Performance Optimization: Identify and resolve performance bottlenecks in systems, databases, and APIs, ensuring high availability and reliability of services. • Collaboration: Work closely with cross-functional teams, including .NET core developers and product managers, to deliver software solutions. • Documentation: Create and maintain technical documentation for systems, processes, and codebases to ensure knowledge sharing and continuity. • Security & Compliance: Implement and enforce security best practices, ensuring that backend systems are secure and compliant with relevant regulations and standards. • Problem Solving: Troubleshoot and resolve complex technical issues, providing timely and effective solutions to minimize downtime and ensure smooth operation of systems. • Cloud & DevOps: Deploy and manage applications on Azure cloud platform, implement CI/CD pipelines, and work with containerization technologies (Docker). Familiarity with GitHub actions and workflows.

• Develop and maintain web applications using React JS • Build responsive and user-friendly interfaces using Tailwind CSS or Bootstrap • Translate business requirements into scalable frontend solutions • Write and maintain end-to-end (E2E) test cases using Playwright • Perform manual and automated testing to ensure application quality • Identify, troubleshoot, and resolve issues in both development and production • Collaborate with developers, designers, and product teams

• Lead the development of web interfaces in React (SPA), ensuring performance, scalability and usability; • Translate business requirements and banking customer journeys into efficient digital experiences; • Work on modernizing legacy front-ends (e.g., MVC, WebForms, older portals) to modern architectures; • Define and evolve front-end architecture standards (componentization, design systems, micro-frontends where applicable); • Integrate with backend APIs (REST/GraphQL) following security and performance best practices; • Ensure compliance with banking security requirements and LGPD (Brazilian General Data Protection Law); • Perform troubleshooting and performance optimization of critical applications; • Collaborate with backend, architecture and UX teams to ensure end-to-end consistency; • Support technical decisions and mentor more junior engineers;

• Assist in developing web-based user interfaces using TypeScript and React • Support efforts to modernize legacy applications by helping re-implement functionality in React • Utilize software engineering tools such as source control systems, build tools, and debuggers • Participate in team activities including Agile ceremonies, sprint planning, and code reviews • Collaborate with team members to troubleshoot issues and propose solutions • Contribute to testing, debugging, and improving application performance • Learn and apply best practices in software development, design patterns, and coding standards • Perform other duties as assigned