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[Job-32240] Senior Java Developer

CI&T· Pyxis – Prod_Pyxis /
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Hybrid (Brazil)HomeofficePosted 1w ago

About the role

Development Engineer with strong Senior Java engineering experience and hands-on expertise using AI-assisted development tools in real software delivery environments. Role focuses on understanding complex Java codebases, modernizing legacy systems, and applying AI-enabled engineering workflows to improve development, testing, and documentation.

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  • Refactor and modernize existing Java applications, including the removal or replacement of legacy dependencies and outdated components.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.

Qualifications

  • 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 (e.g., Claude Code, Codex, GitHub Copilot, Antigravity).
  • 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.

Skills

Required:JavaAI-assisted development toolsReverse engineering

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!
Last updated Oct 21, 2026. Interested? Apply on the company site.

About CI&T

Technology Transformation Specialists

A global technology consulting and digital transformation firm that combines human expertise with AI to develop innovative solutions.

Technology transformationAISoftware developmentCloud servicesDigital experienceData analyticsApplication modernizationConsulting
Company profileWebsite

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