Arppen is looking for a Backend Developer with a focus on C# to strengthen our technology team! If you are passionate about software development, scalability, and sound architectural practices, this position is for you. Responsibilities: * Develop and maintain APIs and backend services using C# and .NET (Framework/Core); * Design and implement scalable and secure solutions for high-performance applications; * Create and optimize SQL and NoSQL database queries and routines; * Implement integrations with external systems via RESTful APIs, gRPC, or messaging; * Apply sound architectural practices, design patterns, and SOLID principles; * Perform unit and integration testing to ensure code quality; * Collaborate with multidisciplinary teams using agile methodologies (Scrum/Kanban); * Participate in defining strategies for backend performance, scalability, and security. Requirements: * Proven experience with C# and .NET (Core/Framework); * Solid knowledge of relational databases (SQL Server, PostgreSQL, MySQL) and NoSQL databases (MongoDB, Redis); * Experience developing RESTful APIs and Web Services; * Knowledge of Entity Framework, Dapper, or other ORMs; * Experience with source code versioning (Git); * Familiarity with web application security (authentication, authorization, OWASP); * Ability to solve complex problems and work effectively in a team. Job type: Full-time Compensation: R$8.000,00 per month