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Fullstack Engineer Java, React, AWS

EnergyHub
Kraków, Poland
Full Time
Posted November 11, 2025
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Job Description

A Full Stack Software Engineer II responsible for designing, developing, and maintaining scalable backend and web applications, primarily using Java and React, to support the migration to microservices architecture and enhance the EnergyHub platform's flexibility and performance.

Key Responsibilities

  • Design, develop, and maintain scalable, secure backend services using Java Spring Boot
  • Participate in code reviews, mentor junior developers, and promote best practices in software development
  • Troubleshoot, debug, and optimize application performance
  • Collaborate with cross-functional teams to deliver robust, scalable solutions
  • Create and maintain service architecture, platform, and tools for a microservices ecosystem
  • Ensure adherence to CI/CD, testing, and code quality standards
  • Stay updated with emerging technologies and industry trends

Requirements

  • 3 years of professional software engineering experience, preferably with prior senior-level responsibilities.
  • Strong experience with Spring Framework.
  • Strong experience in Java, preferably Java 11.
  • Experience with at least one scripting language, e.g., Python3.
  • Excellent problem-solving skills, analytical thinking, and attention to detail.
  • Strong communication and collaboration skills.
  • Design and implement high-quality, scalable, and secure backend services using Java Spring Boot.
  • Participate in code reviews, mentoring junior developers, and driving best practices in software development.
  • Troubleshoot, debug, and optimize application performance.
  • Work within real-world constraints to develop creative solutions that maintain platform flexibility and scalability.
  • Ensure best practices in CI/CD, unit testing, integration testing, end-to-end testing, and code quality.

Benefits & Perks

Long-term employment based on a permanent employment contract
Attractive benefits package including medical care, life insurance, sports package, annual budget for professional development
Opportunity to work with the latest technologies in IoT, SaaS, and machine learning
Collaborate with outstanding people and learn from each other
Make an immediate impact with real responsibilities from day one
Gain diverse and dynamic experience across multiple areas of the business

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