Job Summary: We are seeking a senior Java backend developer to work on a strategic project for maintaining and evolving critical systems, ensuring high availability and performance. Key Highlights: 1. Working on strategic projects focused on system maintenance and evolution 2. Strong expertise in Java backend development and high-volume transactional systems 3. Actively participating in solution design decisions and providing technical support to the team **We are looking for someone who dares to take the lead with us.** We seek a professional to work on a strategic project for continuous maintenance and evolution of critical systems, focusing on high availability, performance, and operational stability. The professional will join a technical team responsible for both evolutionary maintenance and development of new features, supporting the modernization of existing solutions. The main objective of this project is to ensure the **reliability of high-volume transactional systems, with strong emphasis on Java backend development**, including interface and integration with frontend layers. The environment requires constant failure analysis, observability, performance optimization, and rapid incident response. This is a Senior-level position with significant technical responsibility, active participation in solution decisions, root cause analysis, and technical support to the team. **Requirements and Qualifications:** * Experience in Java development, with strong focus on backend * Proficiency in Spring Boot, including: Spring Security, Spring Data * Experience with Java unit testing * Solid knowledge of: Unit testing, Performance testing, Automated testing * Experience with testing and performance tools such as **JMeter.** * Knowledge and experience in frontend development sufficient to handle integrations, adjustments, and support for the interface layer. **Preferred Qualifications:** * Experience with Splunk (monitoring, log analysis, and observability) * Experience in highly critical environments and large-scale systems **Work Model:** Preferably onsite in Porto Alegre/RS – Navegantes neighborhood area. **Additional Information:** * For your health, we offer **comprehensive medical and dental assistance**, with no co-payment for exams or consultations. * Want more well-being? We offer **Gympass** and **Zenklub** (two free sessions per month) to support your physical and mental health. * When hunger strikes, use our meal benefit **Caju** to shop at any supermarket or restaurant. * Love traveling? We have **Férias & Co**, a benefit that helps make your dream vacation possible. * Have children? Count on our **childcare allowance**. * Growing family? We offer **MomCare**, a flexible monetary incentive post-maternity leave for new Datunian mothers. * To personalize your workspace, count on our **home office allowance**. * Want to invest in your professional development? We partner with several renowned educational institutions to offer you discounts of up to 70% on **undergraduate**, **postgraduate**, **MBA**, **language**, and many other courses! **To learn about all our benefits, visit the homepage of our careers page.**