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 and architect robust solutions using C# and .NET Core/6+ Create modern and high-performance interfaces with Next.js Design and implement scalable systems applying Design Patterns and SOLID principles Work with microservices architecture and messaging systems Actively participate in code reviews and provide technical mentorship to the team Contribute to architectural decisions and platform evolution **Technical Requirements:** Solid experience with C# and .NET (Core/6+) Proficiency in algorithms, data structures, and Design Patterns Strong knowledge of SOLID principles Experience with automated testing (xUnit, NUnit, MSTest) Proficiency in Git and Gitflow Experience with Docker and containerization Advanced SQL and query optimization Experience with RabbitMQ or other messaging solutions Next.js: SSR/SSG, routing, internal APIs, and performance optimization **Nice-to-have qualifications:** Experience with Cloud platforms (AWS, Azure, or GCP) Knowledge of CI/CD and pipeline automation Experience with observability (logs, metrics, tracing) Open-source contributions or side projects **Hiring type:** PJ – 100% Remote Job type: Freelance / PJ Contract duration: 12 months Compensation: BRL 10,000.00 – BRL 12,000.00 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)