Senior Kotlin/Java Backend Engineer

We are looking for a Senior Kotlin/Java Backend Engineer who thrives in complex data-driven environments, learns new frameworks quickly, and contributes to the continuous improvement of our architecture and delivery practices.

The Market-wide Half-Hourly Settlement (MHHS) Program is a key initiative shaping the future of the UK energy market. The system enables the measurement and processing of electricity consumption data every half hour — providing a more accurate view of real energy usage. This drives fairer tariffs, supports renewable integration, and fosters a more efficient, data-driven energy ecosystem.

As a Backend Engineer, you will play a central role in building and maintaining the core data processing flows of the MHHS system, ensuring scalability, reliability, and accuracy of large-scale data operations. You’ll work within the IOps pod, collaborating with cross-functional teams to design, develop, and evolve high-performance backend services running on the JVM stack.

Responsibilities:

Design, build, and maintain core backend components and data processing flows for the MHHS platform
Implement reliable, efficient, and scalable services using Kotlin and Java (JVM)
Work with frameworks such as Quarkus and Spring (DI) to develop and integrate backend services
Apply ORM and persistence best practices using Hibernate
Collaborate closely with other engineers, data specialists, and DevOps to ensure smooth system integration
Contribute to the CI/CD pipeline and modern software delivery practices
Ensure observability, fault tolerance, and performance optimization of backend services
Participate in code reviews, architectural discussions, and continuous improvement of engineering practices
Support Agile delivery through estimation, planning, and iterative value delivery
Promote clean code principles, testing culture, and high engineering standards

Requirements:

5+ years of experience in backend development using Java and/or Kotlin
Proficiency with Hibernate and relational databases (SQL, PostgreSQL)
Hands-on experience with Spring Boot or Quarkus frameworks
Experience with CI/CD pipelines, version control (Git), and Agile delivery practices
Experience with Docker and cloud environments (AWS and/or GCP)
Knowledge of Kafka, message queues
Understanding of event-driven architecture and RESTful APIs
Experience building reliable, scalable backend systems with a strong observability and security focus
Excellent problem-solving and analytical skills
Upper-intermediate English and effective communication in distributed teams

Would be a plus:

TypeScript skills — ability to understand or contribute to backend code when needed
Understanding of energy sector data flows

We offer*:

Flexible working format - remote, office-based or flexible
A competitive salary and good compensation package
Personalized career growth
Professional development tools (mentorship program, tech talks and trainings, centers of excellence, and more)
Active tech communities with regular knowledge sharing
Education reimbursement
Memorable anniversary presents
Corporate events and team buildings
Other location-specific benefits
not applicable for freelancers

Senior Kotlin/Java Backend Engineer

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