Senior Backend Engineer

Required skills: Java, Spring, Spring Boot, OOP, Clean Code, Microservices, Kubernetes, PostreSQL, Git, GitHub PROJECT Join the Next Generation System Management (NGSM) team developing a modern network management platform for mission-critical radio systems. As a Senior Backend Engineer , you will design and develop scalable backend services and microservices, contribute to architectural decisions, and ensure high performance, reliability, and maintainability of distributed systems. You will work in an experienced engineering team where technical discussions, clean code, modern technologies, and continuous improvement are an important part of everyday work. YOU WILL Design, develop, and maintain backend services and microservices using Java 21+ and Spring Contribute to architecture and technical design decisions for distributed systems Build and orchestrate microservices running in Kubernetes and cloud environments Develop event-driven solutions using Kafka and Azure Event Hubs Design, manage, and optimise PostgreSQL databases Improve application performance, scalability, reliability, and resource utilisation Troubleshoot complex backend, networking, performance, and orchestration issues Work with Azure, Kubernetes, Linux, Git, and GitHub Use GitHub Copilot and Google Gemini as part of the daily software development workflow Maintain high standards of clean code, testing, and software engineering practices Participate in technical discussions, code reviews, and architectural improvements Collaborate with other engineers in an Agile environment MUST HAVE Strong commercial experience with Java , preferably Java 21+ Very good knowledge of Spring / Spring Boot Strong understanding of OOP, clean code, and software engineering principles Experience designing and developing microservices and distributed systems Experience with Kubernetes Experience with cloud platforms, preferably Microsoft Azure Hands-on experience with messaging technologies such as Kafka and/or Azure Event Hubs Strong knowledge of PostgreSQL , including database design and optimisation Experience with performance tuning and optimisation of backend services Good knowledge of Git and GitHub Practical knowledge of Linux and scripting/automation Understanding of networking fundamentals , including protocols, routing, and network services Experience using generative AI tools such as GitHub Copilot or Google Gemini in software development Very good troubleshooting and analytical skills English allowing effective communication in an international engineering environment NICE TO HAVE Experience working with mission-critical or high-availability systems Hands-on experience with lab environments, including system configuration, installations, upgrades, and manual testing Experience working as an external contractor or consultant within Agile engineering teams Experience creating and maintaining technical and architectural documentation Experience mentoring engineers and driving technical discussions Knowledge of CI/CD pipelines and DevOps practices Ability to quickly learn new technologies and adapt to changing technical requirements OUR OFFER The relocation package (4500 PLN total value) is paid in three installments (1500 PLN per month) if your permanent office presence is mandatory and you need to relocate from another city. Benefits: Extended medical care (over 2000 medical facilities in Poland, 80 in Kraków) for you and your family; Multisport card ; Life insurance