Senior Java Backend Engineer | Spring Kubernetes & Azure

Infolet; Kraków; Hybrid; PLN 210,000 - 320,000; Full time

Benefits offered by this job

Relocation package (4,500 PLN total)

Extended medical care

Multisport card

Life insurance

Job summary

Infolet is seeking a Backend Engineer in Kraków (Hybrid: 2 days in the office, 3 days remote) to join the NGSM team. You will design and develop scalable backend services and microservices, influence architecture, and ensure high performance and reliability of distributed systems.

You will work with Java 21+ and Spring, Kubernetes, Kafka, Azure, PostgreSQL, and modern CI/CD practices in an agile environment. Strong English communication is required.

Qualifications

• Strong commercial experience with Java, preferably Java 21+.
• Very good knowledge of Spring / Spring Boot.
• Understanding of OOP, clean code, and software engineering.
• Experience designing microservices and distributed systems.
• Experience with Kubernetes and cloud platforms (Azure).
• Messaging using Kafka and/or Azure Event Hubs.
• Strong PostgreSQL knowledge, including design and optimisation.
• Performance tuning and optimisation of backend services.
• Good Git and GitHub workflow, Linux familiarity.
• Networking fundamentals and scripting/automation basics.
• Experience using AI tools like GitHub Copilot or Gemini.
• Excellent troubleshooting and international communication in English.

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 with Kafka or 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 engineers in an Agile environment using Azure, Kubernetes, Linux, Git, and GitHub.
• Incorporate Gen AI tools in daily development workflows (Copilot, Gemini).
• Maintain high standards of clean code, testing, and software practices.
• Participate in code reviews and architectural improvements.

Skills

Java

Spring Boot

OOP

Microservices

Kubernetes

Azure

Kafka

PostgreSQL

Performance tuning

Git

Linux

Networking

AI tools

English

Tools

GitHub Copilot

Google Gemini

Git

Job description

Infolet is seeking a Backend Engineer in Kraków (Hybrid: 2 days in the office, 3 days remote) to join the NGSM team. You will design and develop scalable backend services and microservices, influence architecture, and ensure high performance and reliability of distributed systems.

You will work with Java 21+ and Spring, Kubernetes, Kafka, Azure, PostgreSQL, and modern CI/CD practices in an agile environment. Strong English communication is required.