**Senior .NET Developer** **About the company** We are a technology company focused on developing high-complexity backend solutions for clients in industries such as banking, fintech, and cybersecurity. We build mission-critical platforms handling high data volumes and thousands of operations per second, prioritizing clean architecture, scalability, and software quality. We work with high technical standards and a strong focus on engineering best practices. **Responsibilities** * Design, develop, and maintain backend applications in .NET * Build distributed, scalable, and high-performance microservices * Apply design patterns, Clean Architecture, DDD, and CQRS * Implement asynchronous processing, background tasks, and concurrency handling * Integrate messaging and caching systems such as Kafka and Redis * Design and integrate solutions for large-scale data volumes * Work with databases such as MongoDB, ElasticSearch, or Cosmos DB * Analyze and optimize performance, memory consumption, and CPU usage * Perform debugging, profiling, and memory leak analysis * Participate in architectural and technical design decisions **Requirements** * Solid experience developing backend applications in .NET * Proven experience building scalable and distributed microservices * Hands-on experience applying Clean Architecture, DDD, CQRS, and design patterns * Practical experience with Kafka and/or Redis in production environments * Experience working with large-scale data volumes * Experience with MongoDB, ElasticSearch, or Cosmos DB * Advanced knowledge of asynchrony, multithreading, and background tasks * Experience in system performance analysis and optimization **Desirable qualifications** * Experience in critical domains such as banking, fintech, or cybersecurity * Experience with high-transaction-load systems * Experience with event-driven architectures * Use of AI tools to enhance development productivity and code quality **Competencies** * Proactive and highly solution-oriented profile * High autonomy and accountability * Capacity for continuous learning * Strong quality orientation and commitment to engineering best practices **Conditions** * Work mode: 100% remote * Contract type: Freelance / Contractor * Working hours: Full-time * Salary: To be agreed upon based on experience * Stable, long-term project Job type: Full-time Application question(s): * Monthly salary expectation in USD (freelance contract): * Years of professional experience with .NET: * Do you have experience handling large-scale data volumes with MongoDB, Elasticsearch, or Cosmos DB? * Have you worked with Kafka or Redis in production? * Do you have real production experience with .NET microservices using Clean Architecture, DDD, or CQRS? Work location: Remote