Fullstack Developer - FlexHub Team (m/f/d)
Confirmed on the employer's own hiring board on Nov 5, 2026. First seen by Alion on Nov 4, 2026. Commerzbank Poland scores A on the Alion truth index.
Join our FlexHub team as a Fullstack Developer!
What is FlexHub?
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.
What's in it for you:
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 Specialist Fullstack Developer at flexhub, you drive the technical quality and architecture of our integrated systems. You architect scalable solutions, mentor junior colleagues, and solve the most difficult engineering problems we face. Your deep expertise in both Java and frontend architectures allows you to make decisions that last. You are the technical anchor your team relies on.
What will you be doing?
- Design and develop critical full-stack modules capable of handling high transaction volumes.
- Define interface contracts and ensure data consistency across distributed systems.
- Solve complex technical challenges, including concurrency and memory management issues.
- Define testing strategies and ensure adherence to security and development best practices.
- Support the team during technical planning and help resolve technical blockers.
- Analyse production metrics to identify bottlenecks and support capacity planning.
- Document key architectural decisions using Architectural Decision Records (ADRs).
- Mentor and support developers, helping them grow their technical skills and advance their careers.
- Advise Product Management on the technical feasibility, complexity, and risks of new features.
- Drive continuous improvement by introducing tools, frameworks, and practices that increase developer productivity and software quality.
What is important for us?
- Hands-on experience with Java and React
- Experience with RESTful Web Services
- Good knowledge of SQL, HTML5, and Git
- Experience with unit testing
- Good understanding of object-oriented design principles
- Experience working with Agile methodologies
- Fluency in English and Polish, both at a minimum B2 level
- Strong analytical and problem-solving skills, with attention to detail
- Customer-oriented mindset with a proactive approach and a strong sense of ownership
- Ability to deliver high-quality results on time
- Excellent communication and collaboration skills
- Flexibility and ability to adapt to a fast-changing environment
- A strong team player, comfortable working in international and cross-functional teams
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.