Staff Software Engineer – C# / .NET
At a glance
- Staff-level engineering role on a high-scale, mission-critical payments platform
- Drive architecture, technical strategy, and engineering standards
- Hybrid working with Belfast city centre office
- Salary up to £75k
About the Company
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.
The Role
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
What You’ll Need
- 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.
Why Apply?
- 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
For more information, connect with Neill Ferguson on LinkedIn or submit your CV via the link below.
