Principal Developer

Salary: £70,000 - 70,000 per year

Requirements:

• Strong experience with Java or Kotlin on JVM 11+
• Strong experience with Spring Boot
• Strong experience in enterprise backend development
• Strong experience with REST APIs and microservices
• Strong experience with SQL and NoSQL databases
• Strong experience with Docker and Kubernetes
• Strong experience with Git and modern development practices
• Comfortable operating at Principal level, making technical decisions, solving complex problems, and helping other engineers develop
• Desirable experience with telecommunications billing
• Desirable experience with Azure
• Desirable experience with CI/CD
• Desirable experience with Linux
• Desirable experience with Redis
• Desirable experience with Elasticsearch or additional programming languages

Responsibilities:

• Stay hands-on with around 90% of the role focused on backend development
• Work on a large platform with high-throughput APIs, Azure Cloud, and an event-driven architecture
• Help shape technical direction, engineering standards, and architecture
• Mentor other engineers
• Evaluate new technologies
• Work closely with customers and stakeholders to turn requirements into robust technical solutions

Technologies:

• Azure
• Backend
• CI/CD
• Cloud
• Docker
• ElasticSearch
• Git
• JVM
• Java
• Kotlin
• Kubernetes
• Linux
• NoSQL
• REST
• Redis
• SQL
• Spring
• Spring Boot
• microservices
• Angular
• DevOps
• MongoDB
• PostgreSQL
• RabbitMQ
• React
• Ruby
• TypeScript

More:

We are a growing business within the telecommunications and online payments space, working on a large, high-throughput platform. This is a remote-first Principal Software Developer role based around our Newbury office, with only 2-3 visits per year expected, though you are welcome to spend more time there if you prefer. You will join our 16-person R&D development team, made up largely of senior engineers, and benefit from monthly and quarterly all-hands events including summer and Christmas gatherings. Our benefits include 24 days holiday plus your birthday off, private medical cover, life assurance, critical illness cover, an employee assistance programme, and a contributory pension.

last updated 34 week of 2026