Mid Backend Engineer (UK Remote)

We re disrupting the antiquated, paper-based mortgage market by delivering better products and a superior customer experience. In your role, you will:

Responsibilities

• 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!

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 security basics, including authentication, authorization, and OAuth 2.0 concepts.
• Experience working with MongoDB or other NoSQL databases, including basic data modelling and indexing.
• Experience with Git and standard collaborative workflows (pull requests, code reviews, resolving conflicts).
• Ability to work independently on tasks, collaborate in a team, and deliver features from design to production.

Nice to have

• Experience with Kotlin for backend development.
• Experience with Keycloak or other Identity and Access Management solutions.
• Experience with observability tools such as Grafana, Loki, Prometheus, and logging/monitoring systems.
• Experience with Docker and Kubernetes.
• Experience with Python and FastAPI for building backend services.