At Paymentology, we're building the global payments platform of the future. Our mission is to empower banks, fintechs, and innovators with modern, scalable, cloud-first issuing and processing solutions. As a fully distributed organisation operating across 60+ countries, we move fast, think globally, and build technology that supports millions of transactions daily. We're looking for a Senior Software Engineer to design, build, and scale Java backend services that power our global payments infrastructure. You'll lead end-to-end delivery, contribute to technical strategy, and help raise the engineering bar across the organisation. Key Responsibilities: - Lead the design and development of backend services, distributed systems, and APIs - Own features end-to-end (architecture, coding, testing, observability, and deployment) - Write clean, maintainable, well-tested code following engineering best practices and test-driven development - Break down complex technical work into manageable chunks - Work in a collaborative, cross functional, agile team environment - Mentor associate and mid-level engineers, fostering a culture of technical excellence - Identify, document, and deliver technical improvements (performance, reliability, scalability) - Participate in incident response and support rotations Requirements: - Significant commercial experience with modern Java 15+ (5+ years of experience with multiple projects) - Proven experience designing, building and maintaining distributed systems and microservices - Deep understanding of Object-Oriented programming - Familiarity with event-driven architectures or Domain Driven Design - Strong grasp of relational databases (PostgreSQL, MySQL) and data modeling - Solid understanding of cloud infrastructure (AWS preferred), containerisation, CI/CD, and Infrastructure-as-Code - Love of test-driven development - Desire to learn, grow and collaborate with an amazing team Nice to have: Experience in fintech, payments, or other high-throughput/regulated domains. What you can look forward to: - 100% remote, globally distributed team - High-impact role supporting real-time global payments - Growth path toward Senior Engineer 2, Staff Engineer, or Engineering Manager - Diverse, mission-driven engineering culture