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Circle K Logo Circle K · IT - Software Development

Intern Java Backend Developer

Poland, Warsaw · Job Posted March 20, 2026
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Job Description

We are looking for a Java Back-End Developer Intern to join our dynamic engineering team. As an intern, you will contribute to the development and enhancement of our EV and Fuel platforms, working on microservices architecture, cloud integration, and API development. You will gain hands-on experience in enterprise-level application development while collaborating with senior developers, architects, product managers and other roles involved in SDLC.

Job Responsibility

  • Assist in developing and maintaining RESTful APIs using Java and Spring Boot for eMobility services
  • Work with databases (PostgreSQL, MySQL) to store and process EV charging and mobility data
  • Write clean code and follow best practices and participate in code reviews
  • Collaborate with senior developers to debug, optimize, and enhance backend services
  • Participate in Agile development processes, including daily stand-ups and code reviews

Requirements

  • Understanding of Java programming fundamentals
  • Understanding of basic OOP principles
  • Basic understanding of algorithms and data structures
  • Basic understanding of SQL and database management
  • Basic understanding of RESTful APIs
  • Familiarity with Git
  • Exposure to testing frameworks
  • Exposure to frameworks like Spring or Hibernate (optional)
  • Interest in emerging technologies, especially in AI tolls supporting SDLC
  • Willingness to learn
  • Good communication
  • Team collaboration
  • Basic problem-solving
  • English level B2+ (written and spoken) + IT terminology

Nice to have

  • Exposure to frameworks like Spring or Hibernate (optional)
  • Interest in emerging technologies, especially in AI tolls supporting SDLC

What we offer

  • Hands-on experience with modern backend technologies in the Retail, EV and Fuel market in Global scale
  • Hands-on experience with SCRUM and SAFe
  • Exposure to industry-leading smart EV and Fuel projects
  • Mentorship from experienced developers and domain experts
  • Potential for a full-time offer upon completion of the internship
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