Senior Software Engineer

Every day, Global Payments makes it possible for millions of people to move money between buyers and sellers using our payments solutions for credit, debit, prepaid and merchant services. Our worldwide team helps over 3 million companies, more than 1,300 financial institutions and over 600 million cardholders grow with confidence and achieve amazing results. We are driven by our passion for success and we are proud to deliver best-in-class payment technology and software solutions. Join our dynamic team and make your mark on the payments technology landscape of tomorrow.

The Role

The Merchantware and Semi‑Integrated platform is developed and maintained by our Belfast team. The platform handles millions of daily card transactions for customers ranging from small merchants to 70,000‑seat stadiums. Throughput and resilience are critical as the platform is running at 100% uptime.

As a Senior Software Engineer on the Merchantware Gateway, you will contribute to the design and delivery of features on our product roadmap. You will develop backend services (and occasionally frontend components where needed) in collaboration with other engineers, product partners and technology teams. You will help refine solutions, ensure code quality, improve engineering practices, and support the delivery of secure, scalable and reliable payment services.

Duties include

Designing and implementing roadmap features to a high standard within your team

Participating in technical design discussions and contributing to architectural decisions

Improving development processes, methodologies and tools through hands‑on implementation and continuous improvement

Ensuring deliverables are technically accurate, well‑tested and delivered on time

Helping with estimation, planning and communication of progress or issues

Supporting software deployment activities across internal test and production environments

Providing mentorship and guidance to junior engineers through code reviews and pairing

Investigating issues, gathering information from multiple sources and contributing to clear, actionable solutions

Contributing to overall team success by sharing ideas, improving communication and collaborating effectively

Position Requirements

Degree in Computer Science or equivalent experience

4+ years of software development experience

Experience with server‑side development in a Windows c# .NET environment

Experience designing and implementing scalable web service solutions

Strong experience with relational databases (SQL Server or related)

Strong experience with Test Automation (unit testing, BDD/SpecFlow)

Experience with CI/CD pipelines (Bamboo, Jenkins, GitLab or similar)

Strong understanding of design patterns, OO design and refactoring practices

Knowledge of software design principles including cohesion, modularity, encapsulation and separation of concerns

Strong analytical, problem‑solving and organisational skills

Proven ability to work as part of a collaborative engineering team

Excellent communication skills

Experience in Agile/Scrum or Lean/Kanban environments

Eligibility to work in the UK on a permanent full‑time basis

Must be resident or within 1 hour commute to Belfast

Preferred

Knowledge of payment processing or PCI standards

Experience with software usability, system architecture or information security