Java Backend Engineer – Fintech Payments (Distributed Systems)

MiFinity; Belfast City District; Hybrid; GBP 52,000 - 90,000; Full time

Job summary

MiFinity is expanding its Belfast team to build scalable backend systems for payments and eWallet services. You will design APIs, implement distributed Java services, and ensure reliability across high-transaction workloads.

The role covers the full development lifecycle—from whiteboard architecture with stakeholders to delivering clean, well-tested code and collaborating with cross‑functional teams to improve performance and resilience.

Responsibilities

• Develop new in-house products
• Translate application storyboards and use cases into feasible functional applications
• Design, build, and maintain efficient, reusable, and reliable Java code
• Write clean code supported with unit testing modules
• Ensure the best possible performance, quality, scalability and responsiveness of the applications
• Document features and share knowledge within the team
• Collaborate with other team members and stakeholders
• Help maintain code quality, organization, and automatization including undertaking peer code reviews
• Perform integrations with 3rd party applications

Job description

MiFinity is expanding its Belfast team to build scalable backend systems for payments and eWallet services. You will design APIs, implement distributed Java services, and ensure reliability across high-transaction workloads.

The role covers the full development lifecycle—from whiteboard architecture with stakeholders to delivering clean, well-tested code and collaborating with cross‑functional teams to improve performance and resilience.