Senior .NET Developer (Banking) – Remote (Poland)

We are looking for an experienced Senior .NET Developer to join a distributed engineering team working on critical banking systems. The role focuses on extending and modernising applications used across securities and banking operations, with a strong emphasis on system design, scalability, and cloud transformation.

You will work end-to-end on business-critical systems, closely collaborating with Business Analysts, without a separate QA team. A solid background in banking or financial services is essential.

Main Responsibilities

• Design, develop, and extend .NET-based systems supporting multiple banking entities
• Contribute to the integration of securities and core banking platforms
• Support and enhance a portfolio of approximately 17 applications across product control and risk management
• Work with an in-house development framework in a full-stack capacity
• Participate in scaling applications for cloud-based, containerized environments
• Collaborate closely with business stakeholders to deliver robust solutions
• Ensure high code quality through unit and integration testing

Key Requirements

• 5+ years of professional experience as a .NET / C# Developer
• Hands-on experience in the banking or investment banking sector
• Full-stack development experience, with a backend focus and frontend involvement
• Strong understanding and practical application of SOLID design principles
• Experience with document-based databases, such as MongoDB
• Experience with event-driven / event-based messaging frameworks
• Solid knowledge of unit and integration testing
• Experience working end-to-end on applications, including development, testing, and support
• Ability to work independently in a fast-paced, regulated environment
• Availability during UK business hours

Nice to Have

• Experience with cloud platforms and application migration to cloud
• Experience with container technologies, such as Docker and Kubernetes
• Exposure to systems such as Murex or large in-house banking platforms
• Background in securities, risk, or product control systems