Senior Backend Engineer - PayLink

You design and build payment-critical backend services end to end on a modern Java stack, with a high bar for correctness, reliability and security. What you'll do • Design and build payment-critical backend services and APIs on Java / Spring Boot. • Ensure correctness and reliability under load. • Build robust integrations and event-driven flows. • Write thorough tests and help maintain high engineering standards. • Mentor mid-level engineers. Requirements • 5+ years in Java backend with Spring Boot. • Hands-on payments / fintech experience is required — you have worked on real payment or financial-transaction systems. • Hands-on experience with at least one payment processor or gateway (e.g. MPGS, Cybersource or mada). This is a requirement for this role. • Strong microservices and REST API design; relational databases. • Solid grasp of transactional integrity and reliability. • Containers / CI/CD and strong automated testing. • AI-augmented engineering — you actively use AI coding tools such as Claude Code in your day-to-day development. This is a requirement for this role. Nice to have • Experience with more than one payment processor / gateway. • Cloud platforms (OCI, AWS or Azure); Kafka.