About the role We’re looking for a senior engineer who enjoys understanding a customer’s problem, designing a solution and taking responsibility for how it performs in production. This is a hands-on role with substantial ownership. You’ll have the autonomy to move work forward, alongside colleagues who contribute through shared design, reviews and pairing. You will: Own solutions from problem to production. Work with product managers and engineers to understand partner needs, shape the approach, and design, build, test and operate backend services. Make thoughtful technical decisions. Explain tradeoffs clearly and balance delivery time, reliability and maintainability, including when the information available is incomplete. Build across system boundaries. Work with other teams to agree clear interfaces and understand how changes affect the wider payment journey. Improve the systems you operate. Strengthen testing and observability, diagnose production issues, and use what you learn to make services more dependable. Help the team succeed. Contribute across workstreams, share domain knowledge and help other engineers grow through reviews, pairing and mentoring. Our backend stack includes Java, Spring Boot, Kafka and PostgreSQL. You’ll deepen your understanding of funding, settlement and currency conversion, using that knowledge to make better product and engineering decisions. As the team’s scope grows, there will be opportunities to take on broader technical ownership and influence how we build. What will you be doing? Design, develop, and maintain highly scalable services in Java and Spring Boot within a microservices architecture. Apply domain-driven design to build robust, scalable solutions. Lead development efforts in event-driven architectures using Kafka or similar messaging systems. Architect, design, and optimise relational databases (e.g., PostgreSQL) to ensure performance and scalability. Collaborate with cross-functional teams to support partner integrations and expand the Wise payment platform globally. Participate in code reviews, champion best coding practices and mentor junior engineers.