Backend Developer FlexHub Lodz

Join our team as a Backend 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 Backend Developer at flexhub, you drive the technical quality and architecture of our core systems. You architect scalable solutions, mentor junior colleagues, and solve the most difficult engineering problems we face. Your deep expertise in Java and distributed systems allows you to make decisions that last. You are the technical anchor your team relies on to deliver excellence.

Your main tasks are:

• Primary Action:
  Architect and build critical backend services that handle high transaction volumes.
• Integration:
  Define interface contracts and ensure data consistency across distributed systems.
• Implementation:
  Solve complex concurrency and memory management issues in our applications.
• Quality:
  Establish testing strategies and ensure the team adheres to security best practices.
• Collaboration:
  
  Guide the team during technical planning and help resolve blockers.
• Operations:
  Analyse production metrics to identify bottlenecks and plan capacity.
• Documentation:
  Write architectural decision records (ADRs) to track important technical choices.
• Learning:
  Mentor junior and professional developers to help them advance their careers.
• Stakeholder:
  Advise product management on technical feasibility and risks of new features.
• Improvement:
  Drive the adoption of new tools or frameworks that increase developer productivity.

Your Profile:

You possess deep expertise in software engineering with a strong track record in Java, Spring, and microservices architecture. You have experience guiding other developers and making architectural trade-offs. You speak English fluently and can explain complex technical concepts to non-technical colleagues. You value clean code and are always looking for better ways to build software.

• Java
• Spring Framework
• RESTful Web Services
• SQL
• Git
• Object-oriented Design
• Unit Testing
• Agile Methodologies
• Problem Solving
• Technical Documentation

How?

Hybrid on Ogrodowa 8 street Łódź

What we offer?

• Medical care packages inEnel-med,
• Additional Generaliinsurance,
• Multisport Plus Card,
• Pluxee Lunch card,
• Co-financing of glasses or contact lenses,
• PPE - Employee pension scheme, in which the employer's contribution is 5.5% of the monthly salary,
• Special offer at mBank for Commerzbank employees,
• Special offers within mBankgroup
• Access to the Speexxe-learning language platform,
• Access to O’Reilly and Clix (Linkedin Learning) e-learning platform,
• Internal training program Skills@work (Coffee Learning Session - informal quarterly meetings among employees focusing on a given technological or business issue, BigUP - individual mentoring program, Trainer Academy - trainings organized by employees for employees, Guilds - groups focusing on a given technological or business issue),
• External trainings,
• Interest groups and integration events,
• Relocation packages inside and outside Poland,
• Psychological support program for employees and their families, additionally financial and legal consultations (chat, phone, 24/7),
• Additional holiday days after each year worked at Commerzbank (maximum 5 additional days),
• Compensation of upto 100% for sick pay (up to 33 days in a given calendar year),
• Equivalent for electricity and internet while working for home,
• Flexible working time,
• Master benefit - car subscription,
• Travel allowance of 150 PLN for each arrival for the first year of work in Commerzbank for employees traveling…