Senior Java Developer (Keycloak)

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

Benefits offered by this job

Hybrid work model

Private medical care

Sports card subsidy

Group insurance

Paid time off

Mentoring programs

Job summary

Vaillant Group in Katowice is seeking a Senior Java Developer (Keycloak) to design and deliver scalable digital identity solutions for customers and employees across the lifecycle of heating solutions.

You will own a Keycloak-based Customer Identity Management system, develop secure Java web services with JEE and Spring using REST, and deploy with CI/CD in a modern cloud-ready environment. English on a business level is required.

Qualifications

• Degree in Computer Science or a comparable qualification.
• Over five years of professional experience as a Software Developer.
• Experience in Java web services using JEE and Spring with REST architectures.
• Solid knowledge of Identity and Access Management (Keycloak, OAuth, OpenID Connect).
• Nice to have Kotlin, cloud-based SDLC, Kubernetes, CI/CD pipelines and GitOps.
• Familiarity with agile development methods and modern architectural patterns.
• Business-fluent English communication.

Responsibilities

• Own a Keycloak-based Customer Identity Management system and further develop it for stability and scalability.
• Transform reusable functionalities into secure, high-performing APIs.
• Implement monitoring and testing solutions to ensure platform quality and reliability.
• Collaborate with an interdisciplinary team to operate GitOps-based CI/CD pipelines and infra provisioning.

Skills

Java

Keycloak

REST APIs

JEE

Spring

IAM

Kotlin

Kubernetes

CI/CD

GitOps

Education

Degree in Computer Science

Tools

Git

OpenID Connect

OAuth

Jenkins

Job description

Building long-term digital solutions at scale for our customers and employees. And enabling our employees to push their own boundaries and developing in their own individual way. Both count. Both are us.

Company: Vaillant Group Location:Katowice-POL Country: Poland (PL) Brand: Vaillant Group

Contract type: Temporary Working time: Full-time

What we achieve together

In your role as Senior Java Developer (Keycloak), you will contribute to delivering a seamless digital journey for customers and partners across the entire lifecycle of our heating solutions. Working within our Digital Solution Foundations Platform, you will help shape a scalable, secure and future-oriented identity management ecosystem.

• You take full ownership of a Keycloak-based Customer Identity Management system and continuously further develop it to ensure stability and scalability.
• Your responsibilities will include transforming reusable functionalities into reliable, secure and high-performing APIs.
• By implementing monitoring and testing solutions, you ensure the continuous quality and reliability of our digital platform.
• Together with an interdisciplinary team, you evolve and operate GitOps-based CI/CD pipelines and infrastructure provisioning workflows.

What makes us successful together

Qualification: You have a degree in Computer Science or a comparable qualification.

Experience: You bring more than five years of professional experience as a Software Developer.

Know-how and skills: You are experienced in developing Java web services based on JEE and Spring using REST architectures and have solid knowledge of Identity and Access Management, including Keycloak, OAuth and OpenID Connect.

Nice to have: Experience with Kotlin, cloud-based software development lifecycle, Kubernetes, CI/CD pipelines and GitOps will support your success in this role.

Personality: You are familiar with agile development methods and modern architectural patterns, combined with an open, reliable and collaborative mindset.

Language skills: Your business-fluent English enables you to communicate confidently with developers, stakeholders and product owners.

What you can count on

• Flexible work model: adjustable starting times (7:30 – 9:00AM), hybrid work 70/30, and up to 30 days of remote work from abroad from selected countries.
• Health & Wellness support : private medical care (Medicover), sports card subsidy (Multisport), group insurance (Warta), and ergonomic office spaces.
• Time off & balance: additional paid 2 days off and subsidies for recreation.
• Financial perks: up to 30% discount on company products, support for commuting and eyewear.
• Growth & Development: access to internal training, mentoring programs, self-learning platform for languages (eTutor) and international projects.
• Culture & Community: company events, family friendly activities, and open opportunities within Vaillant Group.

What makes us special

We take care of a better climate. In every home and our environment. As a successful family business, we have been living up to this claim for over 150 years. We are one of the world's leading providers of heat pumps, digital services and efficient gas heating appliances and offer energy-saving solutions.

You will find sustainability everywhere at the Vaillant Group. In the office, at the production sites and on the road. Around 16,000 employees from over 70 countries are committed to this every day. As an international team, we take responsibility - for our future and that of our planet. We promote your personal development so that you can act with passion and together we can ensure a better climate.

Become part of the Vaillant Group and help us shape the future of heating!

We promote equity and do not tolerate any form of discrimination. We value the uniqueness of each individual and encourage all people to apply.