Senior Backend Engineer: Java 21+, Spring, Kubernetes & Azure

HeadHR; Kraków; Hybrid; PLN 260,000 - 340,000; Full time

Job summary

HeadHR is seeking a Senior Backend Engineer to join the NGSM team and help build a modern network management platform for mission-critical radio systems. You will design, develop and maintain scalable backend services and microservices, contributing to architecture decisions and ensuring high performance and reliability.

You will work with Java 21+ and Spring, deploy in Kubernetes and cloud environments, and develop event-driven solutions with Kafka and Azure Event Hubs.

Qualifications

• Strong commercial experience with Java (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 like GitHub Copilot or Google Gemini.

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 in Kubernetes and cloud environments.
• Develop event-driven solutions using Kafka and Azure Event Hubs.
• Design, manage, and optimise PostgreSQL databases.
• Improve performance, scalability, reliability, and resource utilisation.
• Troubleshoot complex backend, networking, performance, and orchestration issues.
• Collaborate with Azure, Kubernetes, Linux, Git, and GitHub.
• Use GitHub Copilot and Google Gemini in daily development workflow.
• Maintain high standards of clean code and software engineering practices.
• Participate in code reviews and architectural improvements.
• Collaborate in an Agile environment.

Skills

Java

Java 21+

Spring / Spring Boot

OOP & clean code

Distributed systems

Microservices

Kubernetes

Cloud platforms (Azure)

Kafka

Azure Event Hubs

PostgreSQL

Performance tuning

Git & GitHub

Linux

Networking fundamentals

Generative AI tools (GitHub Copilot,/G

Troubleshooting & analytics

English communication

Tools

Kubernetes

Azure

Kafka

Azure Event Hubs

PostgreSQL

GitHub Copilot

Google Gemini

Job description

HeadHR is seeking a Senior Backend Engineer to join the NGSM team and help build a modern network management platform for mission-critical radio systems. You will design, develop and maintain scalable backend services and microservices, contributing to architecture decisions and ensuring high performance and reliability.

You will work with Java 21+ and Spring, deploy in Kubernetes and cloud environments, and develop event-driven solutions with Kafka and Azure Event Hubs.