Fullstack Developer - FlexHub (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 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.

• 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.