Principal Engineer (Payments)

We’re looking for a Principal Engineer - Payments to join Masabi’s Architecture team, with a primary focus on our payments domain. This role suits someone who can move between system-level thinking and implementation, who understands trade-offs, can navigate ambiguity and helps turn complex or loosely defined problems into clear, practical technical approaches.

Requirements

• Strong experience working on payment systems, including integrations with PSPs, gateways or acquirers
• Good understanding of payment flows, transaction lifecycles and system design considerations
• Experience designing and evolving distributed systems and microservices architectures
• Strong judgement and the ability to balance short-term delivery with long-term architectural outcomes
• Comfortable navigating ambiguity and turning complex problems into clear, practical technical approaches
• Clear and thoughtful communicator, able to engage both technical and non-technical audiences
• Comfortable being hands-on where needed, while maintaining a focus on system-level impact
• You have strong experience with cloud platforms (AWS preferred) and modern infrastructure practices
• You’ve worked on systems where scale, reliability, performance and cost trade-offs matter, and can navigate those decisions thoughtfully
• You’ve contributed to engineering standards, architecture patterns or platform direction
• Interest in or exposure to AI-enabled systems, particularly understanding architectural implications in production

Benefits

• Flexible working hours
• Remote work option
• Hybrid work option (for those based in or around London)
• Clear and thoughtful communication
• Opportunities for career growth and development
• Diverse and inclusive work environment
• Support for underrepresented groups and individuals with disabilities