Senior Backend Developer (Java/Kotlin) with Frontend knowledge

ING Group; Katowice; On-site; PLN 180,000 - 240,000; Full time

Job summary

A leading financial institution in Poland is seeking an Engineer IV to develop and maintain backend services for the Gaia web application. The role requires strong experience in Java and/or Kotlin, familiarity with Spring Boot, and understanding of agile methodologies. You will collaborate closely with frontend developers and participate in agile ceremonies. The position offers a dynamic working environment within a large international team that values innovation and trust.

Qualifications

• Strong experience in Java and/or Kotlin.
• Familiarity with Spring Boot and object-oriented design.
• Basic knowledge of frontend technologies like React or WebComponents.

Responsibilities

• Develop and maintain backend services for the Gaia web application.
• Design APIs and microservices using Java/Kotlin and Spring Boot.
• Collaborate with frontend developers to ensure smooth integration.
• Participate in agile ceremonies and DevOps practices.
• Contribute to service design, strategy, and availability.

Skills

Java

Kotlin

Spring Boot

Agile methodologies

CI/CD pipelines

Relational databases

Frontend technologies

Tools

Azure DevOps

Kubernetes

Job description

ING Hubs Poland is hiring!

We are looking for you if:

• You have strong experience in Java and/or Kotlin.
• You're familiar with Spring Boot and object-oriented design.
• You understand relational databases (MS-SQL is a plus).
• You have experience with CI/CD pipelines (e.g., Azure DevOps).
• You're comfortable working in agile teams and DevOps environments.
• You have basic knowledge of frontend technologies like React or WebComponents.

You’ll get extra points for:

• Experience with Kubernetes and cloud-native deployments.
• Familiarity with frontend testing tools (e.g., Cypress, Vitest).
• Understanding of UI/UX principles.
• Exposure to frontend frameworks and willingness to collaborate on UI integration.
• Experience with containerization and DTAP environments.

Your responsibilities:

• Develop and maintain backend services for the Gaia web application.
• Design APIs and microservices using Java/Kotlin and Spring Boot.
• Collaborate with frontend developers to ensure smooth integration.
• Participate in agile ceremonies and DevOps practices.
• Contribute to service design, strategy, and availability.

Information about the squad:

Work in a large international team, in cooperation with many units of the ING Group. At ING Hubs Poland, we operate in accordance with the Agile approach, based on agile methodologies such as Scrum and Kanban. We are an innovative organization that bases its activities on trust in the people we work with. Thanks to the great freedom of action, we stimulate motivation and creativity, which speeds up work and allows us to flexibly adapt to the changing expectations of our business partners. The basis of our organization are small units called squads, which have a clear vision of their product, independently overcome emerging challenges and together develop the most flexible and effective ways of operating.

The role naming convention in the global ING job architecture will be “Engineer IV”