Senior Fullstack Developer

Description

Job Summary: Fullstack Developer (React + Java/Spring Boot) focused on end-to-end feature implementation, from UI to APIs and integrations. Key Highlights: 1. End-to-end development (Frontend, Backend, Mobile/Terminal) 2. Implementation of responsive web interfaces with React + TypeScript 3. Working with modern technologies such as Spring Boot and Java We are seeking a Fullstack Developer (React \+ Java/Spring Boot). You will work in pair with our Architect/DevOps, focusing on end\-to\-end feature implementation — from the user interface through APIs and integrations. RESPONSIBILITIES **Backend Development:** Implement REST API endpoints (Spring Boot / Java); develop business logic (terminal management, debt inquiry, payment processing); create adapters for integration with external APIs; implement validations, error handling, and response messages; work with relational databases (PostgreSQL) using JPA/Hibernate; implement unit and integration tests; participate in code reviews and pair programming. **Frontend Development:** Develop responsive web interfaces (React \+ TypeScript); create dashboards for operators and management (charts, tables, filters); implement forms for registration and configuration; develop screens for transaction inquiry and reporting; integrate frontend with REST APIs (consuming endpoints); implement authentication and authorization (JWT); ensure accessibility and high-quality UX; apply UI/UX best practices (responsiveness, feedback, loading states). **Mobile/Terminal Development:** Maintenance and enhancement of the Android application for POS terminals; integration with external SDKs; implementation of confirmation screens, receipts, and inquiry screens; testing on physical devices (POS terminals). Relevant Experience Contract: PJ R$ 8000,00 On-site work at Berrini. **Minimum Education:** Bachelor's Degree