Job Responsibilities:

• Design, develop, test, and maintain backend services written in Java and Kotlin using the Spring Boot framework, deployed on cloud infrastructure (AWS)
• Build and maintain RESTful APIs that serve millions of customers across web and mobile platforms
• Develop and optimise services powering the card pay-in payment method — one of the most popular payment methods, enabling Wise customers to move around £1 billion every month
• Design and implement database schemas, write and optimise SQL queries against PostgreSQL databases handling high-volume transactional data
• Build and maintain event-driven architectures using Apache Kafka for asynchronous processing of financial events across distributed services
• Develop and maintain a payment orchestration system that dynamically routes payments across Payment Service Providers to optimize for cost and reliability
• Write automated tests (unit, integration, and end-to-end) to ensure correctness and reliability of financial systems
• Conduct code reviews for team members, ensuring code quality, security, and adherence to engineering standards
• Participate in on-call rotations to monitor and respond to production incidents for Tier 2 critical services
• Collaborate with product managers, designers, analysts, and engineers across other teams to deliver cross-functional projects
• Identify and resolve performance bottlenecks, scalability issues, and technical debt in existing systems
• Ensure development follows security best practices, particularly around handling of sensitive financial data and compliance with financial regulations