[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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Our benefits:   -Health and dental insurance -Meal and food allowance -Childcare assistance -Extended paternity leave -Partnership with gyms and health and wellness professionals via Wellhub (Gympass) TotalPass; -Profit Sharing and Results Participation (PLR); -Life insurance -Continuous learning platform (CI&T University); -Discount club -Free online platform dedicated to physical, mental, and overall well-being -Pregnancy and responsible parenting course -Partnerships with online learning platforms -Language learning platform And many more!   More details about our benefits here: https://ciandt.com/br/pt-br/carreiras   At CI&T, inclusion starts at the first contact. If you are a person with a disability, it is important to present your assessment during the selection process. See which data needs to be included in the report by clicking here.This way, we can ensure the support and accommodations that you deserve. If you do not yet have the assessment, don't worry: we can support you in obtaining it.   We have a dedicated Health and Well-being team, inclusion specialists, and affinity groups who will be with you at every stage. Count on us to make this journey side by side.