Senior C# / .NET Core Developer

**Title:** Senior C# / .NET Core Developer **Industry:** IT Software **Reporting Line:** Engineering Manager/ Service Delivery Manager **Position Type:** Full Time **Location:** Cairo We are looking for a highly skilled and driven Senior C# / .NET Core Developer to build and evolve modern backend systems within a complex, service-based architecture. This role involves working on high-performance services, including edge and IoT scenarios, while leveraging modern development practices and AI-enhanced workflows. ### **Key Responsibilities:** **Backend Development:** * Design, build, and maintain backend and background services using modern .NET * Develop and maintain REST and gRPC APIs * Work within a large, mature codebase by extending, refactoring, and modernizing services * Design efficient data access layers using relational databases **System Architecture & Performance:** * Build and operate distributed and event-driven systems * Ensure high performance and resource efficiency, especially in edge/IoT environments * Apply spike-driven development to validate new features and approaches **AI & Modern Practices:** * Leverage AI tools and adapt to agentic workflows to enhance development efficiency * Continuously explore and adopt modern technologies and practices **Collaboration & DevOps:** * Collaborate with cross-functional teams and contribute to shared architecture standards * Use Docker and Azure DevOps (CI/CD pipelines) to support development workflows ### **Desired Skills:** * Strong expertise in C# and modern .NET (latest versions) * Experience with ORMs (e.g., Entity Framework) and relational databases (SQL Server, PostgreSQL, Azure SQL) * Solid understanding of asynchronous programming, multithreading, and concurrency * Experience building REST APIs and gRPC services * Strong experience in unit testing and writing clean, maintainable code * Experience with distributed systems and service-based architectures * Familiarity with event-driven architectures and messaging patterns * Hands-on experience with Docker and CI/CD pipelines (Azure DevOps) * Experience working within complex, existing codebases * Strong problem-solving and critical thinking skills * Experience or interest in AI tools and agentic workflows * Very good English communication skills ### **Nice to Have:** * Experience with Azure services (APIM, AGW, AKS, IoT Edge, Functions, Blob Storage) * Experience with time-series databases (InfluxDB, TimescaleDB) * Experience with MQTT or similar messaging systems * General cloud architecture knowledge * Interest in experimenting with new technologies * Knowledge sharing and mentoring mindset ### **What We Value:** * Ownership and a self-driven mindset * Clean code, maintainability, and strong documentation practices * Pragmatic approach to evolving and modernizing systems * Willingness to understand systems end-to-end * Proactive adoption of new technologies, especially AI-driven approaches * Strong collaboration and knowledge-sharing culture ### **What We Offer:** * Competitive salary * Social & Medical insurance * Flexible working environment * Professional and supportive work environment * Access to modern tools and technologies * Continuous learning and development opportunities * Clear career growth path ### **About** **CrossWorkers** We are a Danish-owned software offshoring company providing European clients with professional Egyptian developers. We have been in business since 2009, delivering high-quality software development services and building long-term partnerships. Our headquarters are in Copenhagen, Denmark, and our Offshore Development Center is located in the Fifth Settlement, New Cairo. We also have a growing presence across Sweden, Norway, Finland, Switzerland, the UK, Germany, and Bahrain.