Backend Developer - FlexHub Team (m/f/d)

We are Commerzbank's internal delivery capability – a team of engineers, architects, analysts and experts working directly with business units. Unlike external consultancies, we are colleagues who stay. Based in Frankfurt, Sofia, and Łódź, we drive high-priority initiatives while building internal expertise that lasts.

Consulting variety meets corporate stability. You join different teams across the bank when your expertise is needed, then move on to the next challenge. This approach helps you build strong internal know-how and gives you the chance to contribute to meaningful work – one initiative at a time – without sales targets or utilization pressure. No selling. Just a consistent focus on engineering solutions that matter.

As a Professional Backend Developer at flexhub, you engineer robust solutions that serve our customers reliably. You take ownership of specific components, designing and implementing Java-based services with minimal supervision. Your work directly impacts the stability and speed of our banking platform. By solving technical problems independently, you help the team meet its delivery goals sprint after sprint.
Your main tasks are:

• Primary Action: Design and implement complex backend logic using Java and the Spring ecosystem.
• Integration: Integrate third-party services and internal systems using secure REST or messaging protocols.
• Implementation: Translate business requirements into functional, high-performance code.
• Quality: Write comprehensive tests and conduct thorough code reviews to maintain high standards.
• Collaboration: Actively contribute to sprint refinement and estimate technical tasks with the team.
• Operations: Deploy your services to production and troubleshoot incidents when they occur.
• Documentation: Create detailed technical specifications and architecture diagrams for your components.
• Learning: Keep up with Java updates and share interesting findings with your peers.
• Stakeholder: Explain technical challenges to product owners in understandable language.
• Improvement: Refactor legacy code to improve performance and maintainability.

• Java
• Spring Framework
• RESTful Web Services
• SQL
• Git
• Object-oriented Design
• Unit Testing
• Agile Methodologies
• Problem Solving
• Technical Documentation
• Fluency in English and Polish at a minimum B2 level

How?
📌 Hybrid on Ogrodowa 8 Łódź


What we offer? 🥳

Of course, we offer Development Plans for employees, Life insurance, flexible working hours, integration events and much more 😎

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🚩 Please add the following clause to your application:
1. I consent to the processing of personal data contained in this document by Commerzbank AG with its registered office in Frankfurt am Main, Germany, 60261 Kaiserplatz, operating through the Branch in Poland with its registered office in Łódź, 91-203 Łódź, ul. Wersalska 6, KRS 0000631053, for the implementation of the current recruitment process and for the future recruitment for a period of 6 months, in accordance with the Regulation of the European Parliament and of the Council (EU) 2016/679 of 27 April 2016 on the protection of individuals with regard to the processing of personal data the free flow of such data and the repeal of Directive 95/46 / EC (RODO) and in accordance with the Act of 10 May 2018 on the protection of personal data (Journal of Laws of 2018, item 1000). I provided my personal data voluntarily and I declare that they are truthful. I have the right to withdraw this consent at any time. The withdrawal of consent shall not affect the lawfulness of processing based on consent before its withdrawal.
2. I have read the content of the information clause, including information about the purpose and methods of processing personal data and the right to access to my personal data and about the right to correct, rectify and delete it.