Software Engineer - Recurring Payin in London

Company Description: The company is a global technology company, building the best way to move and manage the world’s money. Min fees. Max ease. Full speed. Whether people and businesses are sending money to another country, spending abroad, or making and receiving international payments, the company is on a mission to make their life easier and save them money. As part of our team, you will be helping us create an entirely new network for the world's money. For everyone, everywhere.

Job Description: The Recurring Payin team owns the Direct Debit API that powers automated payments into the company. Underneath this, we are building a platform that allows customers to easily schedule top-ups or business collections. The platform is also built on top of our internal Payin Platform rails; which is a critical component to the company money‑movement machine and we’re looking for an engineer motivated to come and help us build for this. We primarily offer APIs for any partner looking to set up automated funding or pre‑authorizations.

• 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 the company 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 optimise 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.

Additional Information: For everyone, everywhere. We’re people building money without borders — without judgement or prejudice, too. We believe teams are strongest when they are diverse, equitable and inclusive. We’re proud to have a truly international team, and we celebrate our differences. Inclusive teams help us live our values and make sure every Wiser feels respected, empowered to contribute towards our mission and able to progress in their careers.