[Job-32240] Senior Java Developer

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 are looking for a Development Engineer with strong Senior Java engineering experience and hands-on expertise using AI-assisted development tools in real software delivery environments. This role is ideal for an experienced engineer who combines deep technical knowledge of enterprise Java systems with a practical understanding of modern AI-enabled engineering workflows. You will work directly with existing applications and engineering teams, using AI development tools to understand complex codebases, accelerate development, modernize legacy systems, improve test coverage, and support structured software development practices. Responsibilities: Work hands-on with complex, existing Java applications and enterprise codebases. Analyze and reverse-engineer existing systems to understand architecture, dependencies, business logic, and technical constraints. Use AI-assisted development tools as an integral part of the engineering workflow, including code generation, analysis, refactoring, testing, and documentation. Apply structured AI development approaches, including reverse engineering, Spec-Driven Development (SDD), and automated test generation. Refactor and modernize existing Java applications, including the removal or replacement of legacy dependencies and outdated components. Generate and improve automated tests to support safe modernization and refactoring. Collaborate closely with engineering teams and stakeholders to translate requirements and existing system behavior into maintainable technical solutions. Help establish effective, repeatable AI-assisted development practices that can be shared across engineering teams. Maintain high standards for code quality, maintainability, testing, and software engineering best practices. Requirements: Strong Java development experience, ideally within enterprise environments and complex existing systems. Strong hands-on experience with Java application development, maintenance, refactoring, and modernization. At least 3 months of hands-on experience using Copilot as the primary AI code-generation tool within a team project, OR at least 6 months of practical experience with comparable AI coding tools, such as Claude Code, Codex, GitHub Copilot, Antigravity, or similar. Practical experience with shared, structured AI development workflows, particularly reverse engineering and/or Spec-Driven Development (SDD). Hands-on experience using AI-assisted workflows for test generation. Practical experience refactoring existing Java systems to remove or replace legacy dependencies. Strong ability to understand and navigate unfamiliar and complex codebases. Solid software engineering fundamentals, including clean code, automated testing, version control, and collaborative development practices. Strong communication skills and the ability to collaborate effectively with technical teams and stakeholders. Nice to Have: Hands-on experience with Java 17 and Java 21. Experience working with SQL (relational) databases. Familiarity with NoSQL databases 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.