Senior .NET Backend Developer, C#/.NET Core, Fintech

• You'll be working on backend services and application integrations within a fintech platform, connecting back‑office systems with in‑house and third‑party applications.
• The environment is live and demanding — you'll be expected to design, build, and support production‑grade systems where traceability, security, and data integrity are critical.
• The stack centres on modern .NET, with RESTful APIs, domain‑driven service architecture, and SQL Server or Oracle data layers.

Requirements

• At least 4+ years of C# and .NET backend development experience in production environments.
• Minimum 2 years of hands‑on experience with .NET Core 8 or .NET 10.
• Proven experience in application integration — connecting back‑office systems with in‑house and third‑party platforms.
• Strong command of RESTful API design and domain‑driven service architecture principles.
• Mandatory: prior hands‑on experience in fintech, trading, or brokerage projects — this is a hard requirement, not a nice to have.
• Experience optimising database queries and data access layers in SQL Server or Oracle.
• Solid knowledge of secure coding practices and financial data handling requirements.
• Familiarity with API versioning, OAuth/JWT authentication, and integration patterns.
• Experience supporting live production systems — tracing issues, diagnosing root causes, and delivering fixes under pressure.
• Ability to deliver scalable, maintainable backend services using modern .NET practices.
• Strong problem‑solving and analytical skills with the ability to work independently across multiple workstreams.
• Clear communication skills in English (B2 or above).