Desenvolvedor .NET Sênior — (C# / SQL Server / AppSec)

This position is listed on behalf of a partner company, which manages all applications and next steps. Our partner is looking for a Desenvolvedor .NET Sênior — (C# / SQL Server / AppSec) based in Brazil. In this role, you will develop, maintain, and secure enterprise applications, combining advanced .NET engineering with database optimization and application security practices. You will contribute to the evolution of existing systems while ensuring the reliability and integrity of critical business operations. Working across backend development, SQL Server performance, and application security, you will help identify vulnerabilities and implement robust safeguards against potential threats. You will also strengthen secure development practices through code reviews, automated testing, and security checks integrated into CI/CD pipelines. Your work will be particularly important in protecting sensitive data, preserving transactional accuracy, and supporting compliance and audit requirements. This is an opportunity to take technical ownership, solve complex engineering challenges, and make a measurable impact in a quality-focused, security-conscious environment.