Staff Software Engineer

This is a Staff-level engineering position within a high-performing Belfast team responsible for a large-scale, high-throughput payments platform.

You will operate as a technical leader and hands-on engineer, contributing to complex system design while shaping long-term architectural decisions. You'll work closely with senior stakeholders, mentor engineers across the team, and play a key role in driving engineering excellence across the platform.

This role suits someone who enjoys balancing deep technical problem-solving with strategic influence.

Key Responsibilities

• Lead the design and development of complex, scalable, high-throughput systems
• Influence architectural decisions and contribute to long-term technical strategy
• Drive best practices across code quality, testing, and maintainability
• Provide technical leadership and mentorship to engineers across the team
• Collaborate with cross-functional teams to deliver features from roadmap to production
• Identify performance, scalability, and reliability improvements across the platform
• Support production systems, troubleshoot complex issues, and drive root cause analysis
• Contribute to CI/CD pipelines and continuous delivery practices
• Promote a culture of engineering excellence, ownership, and continuous improvement

• 7+ years' commercial software engineering experience
• Strong background in backend development using C# / .NET
• Proven experience designing and building scalable, distributed systems
• Strong experience with RESTful APIs and web services
• Solid knowledge of relational databases (SQL Server or similar)
• Strong understanding of object-oriented design, design patterns, and system architecture
• Experience influencing technical direction or mentoring engineers
• Excellent problem-solving and communication skills
• Experience working in Agile environments

Eligibility: Must be based in Northern Ireland or within commuting distance of Belfast, with the right to work in the UK.

• Competitive salary up to £75k plus bonus
• Hybrid working with a Belfast city centre office
• 26 days annual leave plus bank holidays
• Private medical and dental cover
• High-trust environment with real ownership and autonomy
• Opportunity to shape architecture on a mission-critical platform
• Strong focus on engineering excellence and career progression

Our client is a Fintech technology organisation operating at significant scale, enabling seamless commerce across international markets. Their platforms process millions of transactions daily and are engineered for high availability, security, and performance. With a well-established and growing engineering hub in Northern Ireland, they continue to invest heavily in modernising and scaling systems that underpin critical payment flows across multiple regions.