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Senior Kotlin/Java Backend Engineer (#4150) Job Opening In Poland, Poland – Now Hiring N-iX


Job description

Work type: Office/Remote Technical Level: Senior Job Category: Software Development Project: OVO Energy

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

    Required Skill Profession

    Computer Occupations


    • Job Details

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