This is a remote position. We are looking for a Senior Backend Engineer to join an Investment FinTech focused on digital wealth management and automated investment solutions. You will work with a highly specialized international engineering team, helping build and evolve a modern, scalable, and high-availability platform. Important: L-V 12:00h - 22:00h Espaa. Requirements 8+ years of backend development experience. Strong experience with .NET Core and C#. Advanced experience building and designing REST APIs. Strong knowledge of SQL and NoSQL databases (MongoDB, Firestore, or similar). Experience working with AWS, Azure, or GCP. Experience integrating external services and third-party systems. Technical and conversational English (B2+ or higher). Ability to work independently in distributed environments. Highly Preferred Experience Investment FinTech. Robo Advisors. Neobrokers. Wealth Management platforms. Investment or trading platforms. Integrations with brokers, custodians, or financ...