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JAROCCO | Stellenangebote

The INTERNETONE AG is a specialist for online performance marketing and is a leading online full service provider in Germany. We offer a broad portfolio of services to our customers which contains business analysis, software develoment, creation, product management, online marketing and HR services. We support our customers along the entire life cycle of an online product and because of our passion and our knowledge we are experts all along the line.
We know, we can, we do!

For our software development team we are currently looking for a

Senior Software Web Developer (m/f/d)

Referenz-Nr.: JARO-SWBEe-2025


• development and optimisation of current and new web applications in FrontEnd and BackEnd
• modern, object-oriented software development with C#/ASP.NET Core and ASP.Net MVC using Docker Container
• code review of other team members
• working as a team member or stand alone role in new projects


• University degree in computer science or in a related technical field
• At least 2-3 years of professional experience in software web development
• Very good knowledge with ASP.Net MVC Core, EF Core, ASP.NET MVC, WebApi and TDD
• good knowledge in frontend development in the area of JavaScript, TypeScript and with the client-side frameworks Angular or React
• Quality awareness, hands-on mentality, team spirit, willingness to learn and self-improvement
• Working in English in both written and verbal communication is no problem for you


• Modern working place in a friendly international team
• Flat hierarchies and short decision-making paths
• Central office with excellent transport connections
• Detailed onboarding - we coach you specifically to our technology stack
• Flexible working hours from Monday to Friday
• Flatrate of fruits, snacks, coffee and tea

Sounds like your job? Then please send your full application including your salary expectations stating the reference no. JARO-SWBEe-2025 to

We are looking forward to meeting you!

More information available on

KölnTurm / Im Mediapark 8
50670 Köln

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Köln (Nordrhein-Westfalen)
per sofort
Frau Zsofia Wagensommer
HR Business Partner
Human Resources
KölnTurm / Im Mediapark 8
50670 Köln
Telefon: (0221) 67789830