C# .NET Core Backend Engineer – APIs & SQL | Remote

Client Server Limited is seeking a senior Software Developer in Madrid to lead the rebuild of a major payments platform. You will work on C# .NET Core APIs, design scalable backend services, and own projects from design through production, while mentoring peers. You will split time between the Madrid office and remote work, with 2-3 days in-office and flexible days at home. The role requires strong C# and SQL skills, cloud experience, and English fluency. J-18808-Ljbffr