Backend Developer

Commerzbank Digital Technology Centre Poland

Specialist Backend Developer at flexhub architecting backend services for Commerzbank. Collaborating with teams to deliver high-quality technical solutions without sales pressure in a stable environment.

Posted 5/14/2026full-timeŁódź • 🇵🇱 PolandMid-LevelSeniorWebsite

Tech Stack

Tools & technologies

Distributed SystemsJavaJavaScriptSpringSQL

About the role

Key responsibilities & impact

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

Requirements

What you’ll need

Proficient in Java and JavaScript
Hands-on experience with the Spring Framework
Strong knowledge of RESTful Web Services and APIs
Solid command of SQL for database operations and querying
Skilled in Git for version control and collaborative workflows
Competency in Object-Oriented Design principles
Expertise in writing and executing Unit Tests
Familiar with Agile methodologies, including Scrum or Kanban

Benefits

Comp & perks

Development Plans for employees
Life insurance
flexible working hours
integration events

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

JavaJavaScriptSpring FrameworkRESTful Web ServicesAPIsSQLGitObject-Oriented DesignUnit TestsAgile methodologies

Soft Skills

mentoringtechnical planningproblem-solvingcommunicationteam guidancecapacity planningadvisingcollaborationleadershipsecurity best practices