Senior Backend Developer (.NET)

About us: Talent has no borders. Proxify's mission is to connect top developers around the world with the opportunities they deserve. So, it doesn't matter where you are; we are here to help you fast-track your independent career in the right direction. 🙂 Since our launch, Proxify's developers have successfully worked with 1200+ happy clients to build their products and growth features. 5000+ talented developers trust Proxify and its network to fulfill their dreams and objectives. Proxify is shaped by a global network of supportive, talented developers interested in remote full-time jobs. Our Glassdoor (4.5/5) and Trustpilot (4.8/5) ratings reflect the trust developers place in us and our commitment to our members' success. The Role: We are looking for a Senior .NET Developer to join one of our high-growth client teams as a core backend architect. In this role, you will lead the design and implementation of enterprise-level applications, moving beyond simple CRUD operations to build complex, high-throughput distributed systems. You will be the technical engine behind the client’s product evolution, ensuring that their backend infrastructure is not only performant and secure but also prepared for the latest cloud-native advancements. You are a perfect candidate if you are growth-oriented, you love what you do, and you enjoy working on new ideas to develop exciting products. What we are looking for: 6+ years of professional experience in backend development, with deep expertise in C# and the .NET ecosystem (.NET 6/8/9). Advanced proficiency in building scalable Web APIs, including custom middleware, filter pipelines, and dependency injection. Mastery of Entity Framework Core, including performance tuning, migrations, and handling complex relational schemas in SQL Server. Solid experience with Azure services (or AWS equivalents), particularly in serverless functions, message queues (Service Bus), and containerization. Proven experience with Microservices, Domain-Driven Design (DDD), and event-driven architectures. A strong "test-first" mindset with experience in xUnit/nUnit and Moq for comprehensive unit and integration testing. Strong verbal and written English; comfortable leading technical discussions with cross-functional stakeholders. Time zone: CET (+/- 3 hours). We are unable to consider applications from candidates in other time zones. Nice-to-Have: Experience with Dapr or other microservices runtimes. Familiarity with NoSQL databases such as MongoDB or CosmosDB. Knowledge of Frontend frameworks (React or Angular) to facilitate better API contracts. Relevant Microsoft certifications (e.g., Azure Solutions Architect). Responsibilities: Architect and implement robust, maintainable, and testable backend services from scratch. Identify and resolve performance bottlenecks, optimizing memory usage and query execution times. Lead peer code reviews and establish coding standards to ensure long-term system health. Partner with Product Owners and Frontend Engineers to define technical requirements and API specifications. Work with DevOps to manage deployment pipelines and ensure smooth, zero-downtime releases. What we offer: Get paid, not played No more unreliable clients. Enjoy on-time monthly payments with flexible withdrawal options. Predictable project hours Enjoy a harmonious work-life balance with consistent 8-hour working days with clients. Flex days, so you can recharge Enjoy up to 24 flex days off per year without losing pay, for full-time positions found through Proxify. Career-accelerating positions at cutting-edge companies Discover exclusive long-term remote positions at the world's most exciting companies. Hand-picked opportunities, just for you Skip the typical recruitment roadblocks and biases with personally matched positions. One seamless process, multiple opportunities A one-time contracting process for endless opportunities, with no extra assessments. Compensation Enjoy the same pay, every month with positions