Mid Backend Engineer

About Selina

At Selina Finance , our mission is to provide exceptional value with simple and flexible financial products. We’re achieving this by building a next-generation digital lender targeting homeowners across the UK. More than £2tn of equity value is locked up in UK homes, while homeowners still need to rely on high-interest-rate consumer loans, credit cards, or overdrafts. We believe this is unfair and unnecessary. We offer a financing product unlike anything else out there, one that is as flexible as a current account, as affordable as a mortgage, and as easy to apply for as a consumer loan.

We are building an incredible team and culture of high performance, development, reward and recognition, ready for the next phase of our adventure, and this is where you come in!

We have quite a few things to be proud of:

🌏 We have 19 different nationalities across our London + Manchester offices

🏆 Voted as ‘one of the fastest-growing businesses in the UK’ by Business Leader Growth 500 for 2025

🏆 Voted top 30 of ‘Tempos 100 best start-ups to work for 2023’

🦾 Disability Confident Committed employer

🏆 BCorp Certified

✏️ Rated highly in our employee survey on:

✔ Workplace Culture

✔ Work Life/Balance

✔ Employee Recognition

Purpose of the Role

We’re disrupting the antiquated, paper-based mortgage market by delivering better products and a superior customer experience.

In your role, you will:

Help design, shape and deliver a leading FinTech product and engineering team

Contribute to the team’s work with high-quality, well-tested and scalable code

Develop high-class back-end code in a microservice architecture that builds the foundation of all Selina’s tech products

Support the development of the software stack (e.g. code reviews, unit tests, CI) and documentation

Work closely with our team to understand our customers’ needs

You’ll be right in the heart of the action here at Selina. We’re looking for driven, detail-oriented team players. We win by placing customers' interests first!

Requirements

About You

Strong knowledge of Java Core, including collections, generics, streams, concurrency basics, and modern Java features.

Good understanding of object-oriented design principles and clean code practices.

Commercial experience with Spring Boot and the Spring ecosystem

Experience building REST APIs, including an understanding of HTTP fundamentals

Experience with service-to-service communication and event-driven architecture, including messaging/streaming with Apache Kafka

Experience with unit and integration testing using tools such as JUnit and Mockito (Testcontainers or WireMock is a plus).

Understanding of web application securi