Hybrid Backend Engineer - Java/Spring Microservices

INFOLET SP. Z O.O.; Kraków; Hybrid; PLN 180,000 - 300,000; Full time

Benefits offered by this job

Relocation package (4,500 PLN in three

Extended medical care for you and your

Job summary

INFOLET SP. Z O.O. in Kraków is seeking a Backend Engineer to design and develop scalable services and microservices. You will contribute to architecture decisions and ensure high performance in distributed systems.

You will work with an experienced team in a hybrid setup (2 days in the office, 3 days remote), using Java 21+ and Spring, Kafka, Azure, Kubernetes, and PostgreSQL. Emphasis on clean code, testing, and ongoing improvement.

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, including protocols, routing, and network services.
• 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 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 principles

Distributed systems

Kubernetes

Azure

Kafka/Azure Event Hubs

PostgreSQL

Git/GitHub

Linux

Networking fundamentals

GitHub Copilot/Google Gemini

Tools

Kubernetes

Azure

Kafka

Azure Event Hubs

PostgreSQL

Git

GitHub

Job description

INFOLET SP. Z O.O. in Kraków is seeking a Backend Engineer to design and develop scalable services and microservices. You will contribute to architecture decisions and ensure high performance in distributed systems.

You will work with an experienced team in a hybrid setup (2 days in the office, 3 days remote), using Java 21+ and Spring, Kafka, Azure, Kubernetes, and PostgreSQL. Emphasis on clean code, testing, and ongoing improvement.