Leega is a company focused on delivering efficient and innovative service to its clients. This could not be any different with our primary fuel: people! Our culture is inspiring, and our values are present daily: ethics and transparency, quality excellence, teamwork, economic, social and environmental responsibility, human relationships, and credibility. We seek innovative professionals who are driven by challenges and focused on results. If you are looking for a dynamic, collaborative company that invests in its employees through continuous training, Leega is the place for you! **>> LEEGA IS FOR EVERYONE**, and we would be delighted to welcome you to our team. Join us in shaping our story and building our future. Apply now to our open positions! **Responsibilities and duties** We are seeking a highly skilled **Full Stack Developer**, with solid experience in **React (Front-end)** and **Java (Back-end)**, to work on projects focused on **instant payment solutions (PIX)** within a banking environment. The professional will be responsible for developing new features, integrations, architectural enhancements, and maintaining critical systems, ensuring high performance, security, and scalability. * Develop and enhance web applications using **React** on the front end. * Implement and maintain services, APIs, and microservices in **Java** (preferably Java 11+ or Spring Boot). * Work on building instant payment (PIX) solutions, including validations, integrations, and compliance. * Participate in technical decisions, architectural design, and definition of development standards. * Collaborate with multidisciplinary teams (product, QA, architecture, business). * Ensure code quality through reviews, testing, and adherence to best practices. * Work on internal and external integrations, including messaging systems, enterprise service buses, and banking APIs. * Provide support and resolve incidents in critical banking systems. * Contribute to continuous improvement of application performance, security, and observability. **Requirements and qualifications** **Front-end (React):** * Experience with **React.js**, Hooks, and Context API. * Knowledge of **TypeScript**, CSS-in-JS, Styled Components, or equivalent frameworks. * Consumption of REST APIs and WebSockets. * Knowledge of front-end testing (Jest, React Testing Library). **Back-end (Java):** * Java 11+ * **Spring Boot** and modules (Web, Data, Security, Cloud). * Development of REST APIs. * Knowledge of design patterns and microservice architecture. * Experience with messaging systems (Kafka, RabbitMQ, MQSeries, etc.). **Databases:** Experience with **NoSQL** databases, especially: * **MongoDB** * **Redis** **Banking Context / PIX:** * Experience with **banking systems** and understanding of the financial ecosystem. * Knowledge of processes and integrations related to the **Instant Payment System (PIX)**. * Familiarity with security standards, cryptography, and secure communication (TLS, certificates, JWT, OAuth). **Additional information** **Work model: Hybrid, with 3 days per week in-person in São Paulo (address: Rua Canadá / Jardim América)** **LEEGA** is a reference in consulting and outsourcing for Data Analytics solutions. We have **15 YEARS** in the market and over **20 YEARS** of experience in Business Intelligence, Data Integration, and Analytics solutions, serving major companies across diverse industry sectors, and we currently employ over 580 professionals. We have built strong technical capabilities and assembled top talent to deliver the best possible experience to our clients. Brazilian-based, with project offices, a software factory, and a training center in São Paulo (capital), and international operations with an office also in Portugal, we are known for living and breathing Analytics and Big Data—innovating our technology, sharing knowledge, developing talent, and delivering **VALUE.** Our service portfolio includes specialized consulting, staff augmentation, training, and development of customized solutions for Cloud Computing, Business Intelligence, Big Data, Data Analytics, Machine Learning, Artificial Intelligence, Data Quality, MDM, Data Governance, and other data-related solutions