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.

Skills

Java
Spring / Spring Boot
OOP
Microservices & distributed systems
Kubernetes
Azure
Kafka / Azure Event Hubs
PostgreSQL
Performance tuning
Git / GitHub
Linux scripting
Networking fundamentals
Generative AI tools
Troubleshooting & analytical skills
English communication

Tools

Java 21+
Spring
Kubernetes
Azure
Kafka
PostgreSQL
Git
GitHub
Linux

Job description

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.

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