Salary: £75,000 - 75,000 per year Requirements: 6 years software engineering experience Strong backend experience in .NET / C# Experience building scalable web services / distributed systems Strong understanding of software design and architecture Experience working in Agile environments Strong problem-solving and communication skills Must be based in NI / commutable to Belfast Nice to Have: Payments / fintech experience Nice to Have: PCI or security-focused environments Nice to Have: Frontend exposure (HTML, CSS) Responsibilities: Lead and mentor a team of engineers Design, build and maintain scalable backend systems and APIs Contribute to architecture, standards and engineering best practices Support testing, deployment and production environments Troubleshoot complex issues and drive solutions Collaborate with cross-functional teams to deliver roadmap features Ensure compliance with security and industry standards Technologies: Backend C# CSS Frontend Support Security Web ASP.NET UX UI Design More: We are offering an opportunity for a Staff Software Engineer to join our high-performing Belfast-based engineering team working on a large-scale payment platform. This is a hands-on technical leadership role, where you will lead engineers while contributing to the design and development of highly scalable, high-availability systems processing millions of transactions daily. We provide 26 days holiday plus bank holidays (increasing with service), flexible and remote-first working, private medical and dental cover, a pension with 5-8% matched, enhanced maternity leave, life assurance and income protection, as well as electric car and cycle to work schemes and a share purchase plan. Join us in creating exceptional solutions! last updated 13 week of 2026