[Job-32362] Senior Backend Developer (Java), Brazil

At CI&T, we help large enterprises transform the potential of AI into real business impact with AI Deployment, AI-native execution, and tech-integrated business solutions. With 30 years of experience in technological transformation, we accelerate innovation with expertise in Agentic SDLC, Application modernization, Data & AI, Martech and Business strategy. We are 8,000 CI&Ters across more than 25 countries, collaborating to build solutions with real impact. AI is already part of how we work, evolve, and innovate every day. We’re looking for a Senior Java Backend Developer to join a CI&T squad working on a financial services client. You’ll help modernise an established Java web platform. That means building new services and APIs, keeping the existing platform stable, and gradually moving legacy functionality onto a cleaner architecture. You’ll work closely with frontend developers, QA, a Product Owner and a Tech Lead, using agile practices. What you’ll do - Design, build and maintain backend services and RESTful APIs in Java - Write clean, testable code with good unit and integration test coverage using JUnit - Model data and write efficient SQL against Oracle DB, and tune queries, indexes and transactions - Understand, maintain and refactor legacy modules, including XSLT-rendered pages, and help plan their migration - Join refinement sessions: break features down into technical tasks, estimate them and raise risks early - Review pull requests and help keep cod