Senior .NET Engineer Belfast | Hybrid | Permanent At a Glance Role: Senior .NET Engineer within a high-throughput payments backend team Location: Belfast, hybrid working Type: Permanent Stack: C# / .NET, SQL, CI/CD, Agile Level: Senior with mentoring responsibility Focus: Scalable, mission-critical payment systems processing millions of daily transactions Who You'll Work For Our client is a technology-led organisation operating at significant scale in the payments space. Their engineering teams build and maintain backend systems that process millions of transactions every day, where reliability, performance, and security are non-negotiable. They have a collaborative engineering culture with high standards, and a genuine focus on continuous improvement. What You'll Be Doing As a Senior .NET Engineer, you'll be embedded in a backend engineering team responsible for a high-throughput payment platform. Your day-to-day will include: Designing and delivering backend services across the payment platform Contributing to architectural decisions and system design discussions Building scalable, secure, and highly available distributed systems Improving development processes and raising engineering standards Supporting deployments across test and production environments Mentoring junior engineers through code reviews and pair programming Collaborating closely with product and engineering stakeholders Your Impact In this role, you'll have real influence. You'll help shape the architecture of systems that underpin critical financial operations at scale. Beyond the technical work, you'll play a key role in elevating the team around you, contributing to a culture of quality, accountability, and continuous improvement. What We're Looking For Essential Strong, demonstrable experience with C# and .NET backend development Proven ability to design and build scalable, production-grade web services Solid SQL and relational database experience Experience with automated testing and CI/CD pipelines A firm grasp of software design principles and clean code practices Comfortable working within Agile delivery environments Desirable Experience in payments, fintech, or other high-throughput transaction processing domains Familiarity with cloud infrastructure and deployment tooling Prior experience formally mentoring or supporting junior engineers What's In It For You Work on genuinely mission-critical systems operating at large scale Strong engineering culture with high standards and collaborative ways of working Real opportunity to influence architecture and technical direction Flexible, hybrid working from Belfast Private healthcare and pension scheme included If you're interested or have any further questions on the role, please feel free to reach out to Eve Geddis directly on LinkedIn. Skills: C# Distributed Systems Architecture SQL CI/CD Database Design Benefits: Medical Aid / Health Care Pension Fund ADZN1_NI