Senior Backend Engineer — Java 21+, Spring, Kubernetes

SOLID.Jobs

Kraków

On-site

PLN 180,000 - 260,000

Full time

2 days ago

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Job summary

SOLID.Jobs is seeking a Senior Backend Engineer to join the NGSM team building a modern network management platform for mission-critical radio systems. You will design scalable backend services, contribute to architecture decisions, and ensure performance and reliability of distributed systems.

Join us to work with Java 21+ and Spring, Kubernetes and cloud environments, Kafka/Azure Event Hubs, PostgreSQL, and AI-assisted development.

Qualifications

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.
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.

Responsibilities

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 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.