Senior Backend Engineer
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Summary
Senior backend engineer designing and building Java 21/Spring microservices for a next-generation network management platform for mission-critical radio systems, deployed on Kubernetes and Azure with Kafka event streaming and PostgreSQL. Hybrid role in Kraków, 5+ years experience, B2B pay of 20.2k–23.5k PLN net/month.
Czym będziesz się zajmować?
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- 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
Kogo poszukujemy?
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
- 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
Czego wymagamy?
5 lat doświadczenia na podobnym stanowisku
Znajomości:
- Java
- Spring Boot
- OOP
- Kubernetes
- Azure
- Kafka
- PostgreSQL
- Git
- GitHub
- Polski
- Angielski
Jakie warunki i benefity otrzymasz?
- 20.2k–23.5k PLN netto/m (B2B)
- 14.4k–16.8k PLN brutto/m (Umowa o pracę)
- B2B - Elastyczne godziny pracy (100%)
- Praca zdalna: Hybrydowo
- Szkolenia wewnętrzne
- Pakiet medyczny, Ubezpieczenie, Pakiet sportowy
- Kawa / Herbata
- Parking rowerowy
- Pakiet relokacyjny
Kim jesteśmy?
Od 20 lat wspieramy liderów IT, dostarczając technologie, ekspertów i pełne wsparcie operacyjne - w tym legalizację pobytu i pracy międzynarodowych specjalistów IT Do naszych projektów poszukujemy specjalistów Java, JavaScript, C embedded, C++, PHP, specjalistów od mobile, testerów oprogramowania, administratorów sieci i systemów i wielu innych.
