This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Sênior Developer Backend Java based in Brazil. This is a senior-level opportunity focused on assessing and evolving a large Java application ecosystem within the financial sector. You will analyze applications across Java 8 through Java 21, identifying technical risks, modernization opportunities, and architectural improvements. The role combines hands-on technical assessment with architecture analysis, documentation, and stakeholder collaboration. You will work closely with architects, developers, and client teams to understand complex environments and recommend viable paths forward. The position offers exposure to modern cloud, observability, CI/CD, and application modernization practices. It is ideal for a technically strong professional who enjoys solving complex problems and turning technical findings into actionable recommendations.