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

Commerzbank AG – Poland; Łódź; Vor Ort; PLN 180.000 - 240.000; Vollzeit

Benefits dieser Stelle

Development plans

Life insurance

Flexible working hours

Team integration events

Zusammenfassung

Commerzbank AG in Łódź invites a Specialist Fullstack Developer to join the FlexHub team. You will design and implement scalable full-stack modules using Java and React, define interfaces, and help ensure data consistency across distributed systems.

You will mentor teammates, contribute to ADRs, support product management on technical feasibility, and drive continuous improvement with new tools and practices. Fluency in English and Polish (B2+) is required.

Qualifikationen

• 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.

Aufgaben

• 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 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.

Kenntnisse

Java

React

RESTful Web Services

SQL

HTML5

Git

Unit testing

OO design

Agile methodologies

English (B2+)

Polish (B2+)

Jobbeschreibung

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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