.NET Developer with Payments Experience

Role Overview:

We are looking for a Senior .NET Developer to join a fintech project delivering greenfield payment initiatives across Europe. This is a hands-on engineering role focused on building modern, compliant payment platforms from the ground up, requiring deep expertise in real-time and batch payment systems, banking standards, and Open Banking within regulated environments.

Key Responsibilities:

Develop and maintain backend payment processing services using C# / .NET

Implement and process ISO 20022 and SWIFT MT/MX payment messages

Integrate with bank APIs, real-time payment rails, and file-based channels

Support the full payment lifecycle from initiation to clearing, settlement, and reconciliation

Ensure security, compliance, error handling, and auditability of payment flows

Collaborate with engineering, product, and compliance teams

Contribute to code reviews, testing, CI/CD, and technical documentation

Must-Have Requirements:

6+ years of hands-on experience with C# / .NET (Core / 6 / 7 / 8)

Strong, practical experience with payment systems and banking integrations

Advanced knowledge of ISO 20022, SEPA, and payment messaging standards

Hands-on experience with SWIFT, FPS, BACS, CHAPS, TARGET2

Proven experience with Open Banking and regulated payment environments

Experience with REST, SOAP, SFTP, XML/JSON, message queues, and SQL Server

Secure coding practices and familiarity with Docker

Excellent English communication skills

Nice to Have:

Experience with core banking systems or digital wallets

Knowledge of cut-off times, clearing, and settlement processes