Know ATS Score
CV/Résumé Score
  • Expertini Resume Scoring: Our Semantic Matching Algorithm evaluates your CV/Résumé before you apply for this job role: Senior Kotlin/Java Backend Engineer (#4150).
Poland Jobs Expertini

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

Senior Kotlin/Java Backend Engineer (#4150)



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



    Your Complete Job Search Toolkit

    ✨ Smart • Intelligent • Private • Secure

    Start Using Our Tools

    Join thousands of professionals who've advanced their careers with our platform

    Rate or Report This Job
    If you feel this job is inaccurate or spam kindly report to us using below form.
    Please Note: This is NOT a job application form.


      Unlock Your Senior Kotlin Potential: Insight & Career Growth Guide


    • Real-time Senior Kotlin Jobs Trends in Poland, Poland (Graphical Representation)

      Explore profound insights with Expertini's real-time, in-depth analysis, showcased through the graph below. This graph displays the job market trends for Senior Kotlin in Poland, Poland using a bar chart to represent the number of jobs available and a trend line to illustrate the trend over time. Specifically, the graph shows 5210 jobs in Poland and 689 jobs in Poland. This comprehensive analysis highlights market share and opportunities for professionals in Senior Kotlin roles. These dynamic trends provide a better understanding of the job market landscape in these regions.

    • Are You Looking for Senior Kotlin/Java Backend Engineer (#4150) Job?

      Great news! is currently hiring and seeking a Senior Kotlin/Java Backend Engineer (#4150) to join their team. Feel free to download the job details.

      Wait no longer! Are you also interested in exploring similar jobs? Search now: .

    • The Work Culture

      An organization's rules and standards set how people should be treated in the office and how different situations should be handled. The work culture at N-iX adheres to the cultural norms as outlined by Expertini.

      The fundamental ethical values are:
      • 1. Independence
      • 2. Loyalty
      • 3. Impartiality
      • 4. Integrity
      • 5. Accountability
      • 6. Respect for human rights
      • 7. Obeying Poland laws and regulations
    • What Is the Average Salary Range for Senior Kotlin/Java Backend Engineer (#4150) Positions?

      The average salary range for a varies, but the pay scale is rated "Standard" in Poland. Salary levels may vary depending on your industry, experience, and skills. It's essential to research and negotiate effectively. We advise reading the full job specification before proceeding with the application to understand the salary package.

    • What Are the Key Qualifications for Senior Kotlin/Java Backend Engineer (#4150)?

      Key qualifications for Senior Kotlin/Java Backend Engineer (#4150) typically include Computer Occupations and a list of qualifications and expertise as mentioned in the job specification. Be sure to check the specific job listing for detailed requirements and qualifications.

    • How Can I Improve My Chances of Getting Hired for Senior Kotlin/Java Backend Engineer (#4150)?

      To improve your chances of getting hired for Senior Kotlin/Java Backend Engineer (#4150), consider enhancing your skills. Check your CV/Résumé Score with our free Tool. We have an in-built Resume Scoring tool that gives you the matching score for each job based on your CV/Résumé once it is uploaded. This can help you align your CV/Résumé according to the job requirements and enhance your skills if needed.

    • Interview Tips for Senior Kotlin/Java Backend Engineer (#4150) Job Success
      N-iX interview tips for Senior Kotlin/Java Backend Engineer (#4150)

      Here are some tips to help you prepare for and ace your job interview:

      Before the Interview:
      • Research: Learn about the N-iX's mission, values, products, and the specific job requirements and get further information about
      • Other Openings
      • Practice: Prepare answers to common interview questions and rehearse using the STAR method (Situation, Task, Action, Result) to showcase your skills and experiences.
      • Dress Professionally: Choose attire appropriate for the company culture.
      • Prepare Questions: Show your interest by having thoughtful questions for the interviewer.
      • Plan Your Commute: Allow ample time to arrive on time and avoid feeling rushed.
      During the Interview:
      • Be Punctual: Arrive on time to demonstrate professionalism and respect.
      • Make a Great First Impression: Greet the interviewer with a handshake, smile, and eye contact.
      • Confidence and Enthusiasm: Project a positive attitude and show your genuine interest in the opportunity.
      • Answer Thoughtfully: Listen carefully, take a moment to formulate clear and concise responses. Highlight relevant skills and experiences using the STAR method.
      • Ask Prepared Questions: Demonstrate curiosity and engagement with the role and company.
      • Follow Up: Send a thank-you email to the interviewer within 24 hours.
      Additional Tips:
      • Be Yourself: Let your personality shine through while maintaining professionalism.
      • Be Honest: Don't exaggerate your skills or experience.
      • Be Positive: Focus on your strengths and accomplishments.
      • Body Language: Maintain good posture, avoid fidgeting, and make eye contact.
      • Turn Off Phone: Avoid distractions during the interview.
      Final Thought:

      To prepare for your Senior Kotlin/Java Backend Engineer (#4150) interview at N-iX, research the company, understand the job requirements, and practice common interview questions.

      Highlight your leadership skills, achievements, and strategic thinking abilities. Be prepared to discuss your experience with HR, including your approach to meeting targets as a team player. Additionally, review the N-iX's products or services and be prepared to discuss how you can contribute to their success.

      By following these tips, you can increase your chances of making a positive impression and landing the job!

    • How to Set Up Job Alerts for Senior Kotlin/Java Backend Engineer (#4150) Positions

      Setting up job alerts for Senior Kotlin/Java Backend Engineer (#4150) is easy with Poland Jobs Expertini. Simply visit our job alerts page here, enter your preferred job title and location, and choose how often you want to receive notifications. You'll get the latest job openings sent directly to your email for FREE!