We are looking for a **Junior or Intermediate Back-End Developer** with experience developing scalable APIs and systems using C# and .NET. We value professionals who adhere to best practices in architecture, security, and performance, and who contribute efficient, well-structured solutions. **Responsibilities:** * Develop and maintain robust RESTful APIs, organized within modular solutions based on Clean Architecture. * Integrate and optimize relational databases (SQL Server, PostgreSQL, MySQL) and NoSQL databases (MongoDB, Redis). * Implement best practices for API structuring, versioning, and documentation. * Write and maintain unit and integration tests to ensure code quality and stability. * Monitor and optimize application back-end performance, resource consumption, and scalability. * Collaborate with front-end, DevOps, and product teams to develop efficient solutions. * Apply CI/CD practices for agile and secure deployments. * Ensure developed solutions align with architectural best practices and design patterns. **Requirements:** * Practical experience developing RESTful APIs using C# and .NET. * Familiarity with patterns such as Clean Architecture and SOLID principles. * Knowledge of at least one data access approach: ADO.NET, Dapper, or Entity Framework Core. * Experience with relational databases, especially SQL Server. * Basic knowledge of NoSQL databases (e.g., MongoDB) and caching solutions (e.g., Redis). * Experience with Git and team-based code versioning. * Understanding of web application authentication, authorization, and security best practices. * Ability to analyze and optimize code to ensure scalability and performance. **Preferred Qualifications:** * Experience with other programming languages or frameworks such as ASP.NET, React, JavaScript, Node.js, or Python. * Experience with cloud computing (preferably AWS) and container usage, including orchestration via ECS, EKS, or Kubernetes. * Experience with CI/CD pipelines and automated deployments. * Experience with distributed architecture, microservices, or serverless architectures. * Familiarity with messaging systems (e.g., RabbitMQ, Kafka). * Knowledge of application monitoring tools (e.g., Grafana, Prometheus, CloudWatch). * Certifications in .NET development, cloud platforms (AWS, Azure, GCP), or software architecture. * Technical reading and writing proficiency in English. **Benefits:** - Service provider contract — PJ (We seek long-term partnerships); * Remote work; * 8-hour daily workload (168 hours per month); * Flexible time bank, settled every four months (positive balances paid out); * Variable compensation starting after 4 months of contract; * Flexible Card: R$700.00/month food allowance (via Flash card); * Paid leave: 7 consecutive days after 1 year of contract; 15 consecutive days after 2 years; 21 consecutive days (3 non-consecutive weeks) for contracts between 5 and 8 years; and 30 consecutive days thereafter (to be scheduled in separate periods); * Birthday Friday (1 day off during the employee’s birth month); * Partnership with Wellhub; * Partnership with Open English; * Partnership with FIAP; * Partnership with psychological counseling services. **Want to understand how we drive innovation for global enterprises? Visit our website and explore our case studies and digital solutions.** https://www.kognit.com.br/