.NET Developer with payments experience (remote)

Project/Client: Fintech

Duration: 12 months

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