[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 coding standards and technical documentation in good shape
• - Work with DevOps and QA on build pipelines, deployments and production support
• - Help investigate and fix incidents across environments

• What you need (must-have)
• - Around 5 years of professional experience in backend development with Java (Java 11+, ideally 17/21)
• - Solid automated testing skills with JUnit, plus mocking frameworks such as Mockito
• - Hands-on experience with Maven: multi-module projects, dependency management and build lifecycle
• - Experience building Java web applications: REST APIs, JSON/XML handling, HTTP and request/response lifecycle
• - Good knowledge of a Java application framework (Spring Boot, Jakarta EE or similar) and persistence with JPA/Hibernate
• - A solid grasp of object-oriented design, SOLID principles and common design patterns
• - Experience with Git, branching strategies and pull request workflows
• - Familiarity with CI/CD pipelines (e.g. Jenkins, GitHub Actions, GitLab CI or Azure DevOps)
• - Experience working in agile teams (Scrum or Kanban)
• - Good English communication skills for working with international stakeholders

• Nice to have
• - Quarkus, or other cloud-native Java frameworks
• - Apache Kafka: producers, consumers, topics and event-driven design
• AWS S3, and AWS services in general
• - Maintaining or migrating legacy pages built with XSLT (and XML/XPath)
• - Database migration tools such as Flyway or Liquibase
• - API documentation with OpenAPI/Swagger
• - Containerisation with Docker; exposure to Kubernetes or OpenShift
• - Application security basics: OAuth2/OIDC, JWT, and OWASP Top 10 awareness
• - Observability: structured logging, metrics and tracing (e.g. ELK, Grafana, OpenTelemetry)
• - Code quality tools such as SonarQube
• - Experience in banking or other regulated environments

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