Senior Backend Engineer - Java Spring, Kubernetes (Hybrid)

Infolet; Kraków; Hybrid; PLN 180,000 - 260,000; Full time

Benefits offered by this job

Relocation package (4500 PLN total)

Extended medical care

Multisport card

Life insurance

Job summary

Infolet Kraków is looking for a Senior Backend Engineer to join the NGSM team building a modern network management platform for mission-critical radio systems. You will design and develop scalable backend services and microservices using Java 21+ and Spring, and contribute to architectural decisions.

In a hybrid setup (2 days in the office, 3 days remote), you will work on Kubernetes, Azure, Kafka, PostgreSQL, and cloud environments, focusing on performance, reliability, and maintainability

Qualifications

• Strong commercial experience with Java 21+ and Spring Boot.
• Deep understanding of OOP, clean code, and software engineering principles.
• Experience designing microservices and distributed systems.
• Proficiency with Kubernetes and cloud platforms (Azure).
• Hands-on with Kafka and/or Azure Event Hubs for event-driven apps.
• Strong PostgreSQL knowledge and database design/optimisation.
• Performance tuning and backend service optimisation.
• Git and GitHub proficiency with Linux scripting.
• Networking fundamentals and practical problem solving.
• Use of AI tools like GitHub Copilot or Google Gemini in development.
• Excellent troubleshooting and analytical skills; English in international context.

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 backend, networking, performance, and orchestration issues.
• Work with Azure, Kubernetes, Linux, Git, and GitHub.
• Use GitHub Copilot and Google Gemini in daily development workflow.
• Maintain high standards of clean code, testing, and software engineering practices.
• Participate in code reviews and architectural improvements.
• Collaborate with engineers in an Agile environment.

Skills

Java

Spring Boot

OOP & Clean Code

Microservices

Kubernetes

Azure

Kafka

PostgreSQL

Git / GitHub

Linux scripting

Networking basics

AI tools (Copilot, Gemini)

English communication

Tools

Git

GitHub

Job description

Infolet Kraków is looking for a Senior Backend Engineer to join the NGSM team building a modern network management platform for mission-critical radio systems. You will design and develop scalable backend services and microservices using Java 21+ and Spring, and contribute to architectural decisions.

In a hybrid setup (2 days in the office, 3 days remote), you will work on Kubernetes, Azure, Kafka, PostgreSQL, and cloud environments, focusing on performance, reliability, and maintainability