We are looking for a Senior Developer to join our technology team at **Farmacon Contabilidade**, where we develop innovative solutions for the accounting market. **Your responsibilities:** Develop features and APIs using C# and .NET Core/6+ Create components and pages with Next.js following best practices Implement solutions applying Design Patterns and clean code principles Write automated tests and ensure code quality Work with messaging systems and distributed systems Collaborate with the team on code reviews and continuous improvements **Technical Requirements:** Experience with C# and .NET (Core/6+) Strong knowledge of algorithms and data structures Knowledge of Design Patterns and SOLID principles Experience with unit testing (xUnit, NUnit, MSTest) Proficiency with Git and understanding of Gitflow Experience with Docker and containerization concepts Knowledge of SQL and query optimization Experience with messaging systems (RabbitMQ is a plus) Next.js: components, routing, SSR/SSG, and internal APIs **Nice-to-have qualifications:** Experience with Cloud platforms (AWS, Azure, or GCP) Knowledge of CI/CD and automation Interest in observability and monitoring Desire to grow technically and take on new challenges **Hiring type:** PJ – 100% Remote Job type: Freelancer / PJ Contract duration: 12 months Compensation: R$6,000.00 – R$7,000.00 per month Selection question(s): * What is your expected monthly PJ salary? Do not write "to be discussed" Education: * Completed Bachelor’s degree (Preferred) Experience: * Full Stack Development – C# .NET + Next.js (Preferred)