Head of Backend (.NET)

• Lead the backend engineering team (.NET).
• Apply microservice and service-oriented architecture principles in practice.
• Own code quality, code reviews, and technical design.
• Develop and improve intelligent routing, including RL / Q-learning approaches.
• Develop and improve anti-fraud systems.
• Build resilient services using patterns such as idempotency, saga, outbox/inbox, and retries.
• Ensure application-level reliability: performance, correctness, and fault tolerance.
• Implement and scale AI tools in software development and testing.

Social Discovery Group is seeking a Head of Backend (.NET) in Castro-Urdiales, Spain. The role involves leading a backend engineering team, applying microservice architecture, and ensuring application-level reliability. Ideal candidates should possess strong expertise in C# and .NET, with proven leadership experience.

Join a global team dedicated to creating impactful social discovery products, tackling challenges of performance and fault tolerance. Fluent Russian is required for this position., * Strong experience with C# and ASP.NET Core (.NET 6+).

• Proven experience as a Team Lead / Tech Lead.

• Conducting code reviews and making architectural decisions., ASP.NET Core (.NET 6+) Microservices High-load systems RabbitMQ / MassTransit MS SQL Distributed systems Frontend (Angular) Fluent Russian, * Strong experience with C# and ASP.NET Core (.NET 6+).

• Proven experience as a Team Lead / Tech Lead.

• Strong backend expertise with microservices, high-load systems.

• Experience with RabbitMQ / MassTransit.

• Strong SQL skills (MS SQL), including performance optimization.

• Hands-on experience building distributed systems (consistency models, messaging patterns).

• Solid understanding of frontend (Angular) at the level required to manage development.

• Experience conducting code reviews and making architectural decisions.

• Fluent Russian.

Social Discovery Group (SDG) is one of the world's largest groups of social discovery companies, uniting millions of users on dozens of products. SDG solves the problem of loneliness, isolation, and disconnection, transforming virtual intimacy into the new normal. SDG products redefine the way people interact and connect. Our portfolio includes social entertainment platforms designed to connect people online across diverse cultures and regions worldwide. This includes globally recognized brands such as DateMyAge, Dating.com, EuroDate, Dil Mil and Cupid Media. SDG has a presence in more than 150 countries. We bring together a team of like-minded people and IT professionals specializing in the creation and development of globally impactful social discovery products. Our international team of 1000+ professionals and digital nomads works all over the world. Our teams of digital nomads work remotely from Cyprus, Malta, the USA, Armenia, Georgia, Kazakhstan, Montenegro, Poland, Latvia, Serbia, Spain, Portugal, UAE, Israel, Turkey, Thailand, Indonesia, Japan, Hong Kong, Australia and many other locations. We're proud to be a two-time "Great Place to Work" winner (USA & Japan, 2024-2025) and a Top-5 Company for Work-From-Anywhere Jobs (FlexJobs, 2025).