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

This is a fully remote position, open to applicants in Portugal.

📋 Description

• You will engage in backend services and application integrations within a fintech platform, linking back-office systems with both in-house and third-party applications.

• The environment is dynamic and fast-paced — you will be required to design, build, and maintain production-grade systems where traceability, security, and data integrity are essential.

• The technology stack focuses on modern .NET, utilizing RESTful APIs, domain-driven service architecture, and SQL Server or Oracle data layers.

⛳️ Requirements

• A minimum of 4+ years of C# and .NET backend development experience in production settings.

• At least 2 years of practical experience with .NET Core 8 or .NET 10.

• Demonstrated experience in application integration — linking back-office systems with in-house and third-party platforms.

• Strong proficiency in RESTful API design and principles of domain-driven service architecture.

• Essential: previous hands-on experience in fintech, trading, or brokerage projects — this is a firm requirement, not just a preference.

• Experience in optimizing database queries and data access layers in SQL Server or Oracle.

• Comprehensive understanding of secure coding practices and financial data handling standards.

• Familiarity with API versioning, OAuth/JWT authentication, and integration patterns.

• Experience in supporting live production systems — identifying issues, diagnosing root causes, and providing solutions under pressure.

• Capability to deliver scalable, maintainable backend services using contemporary .NET practices.

• Strong problem-solving and analytical abilities, with the capacity to work independently across various workstreams.

• Effective communication skills in English (B2 or higher).

🏝️ Benefits

• 15th month salary.

• Health insurance that covers your family.

• Birthday off.

• Mobility program for digital nomads.

• Genuine work-life balance.