Backend Developer C# / .NET (m/f/d) at DIRS21, interim Group, DE

At DIRS21, we are the market leader in online booking and channel management systems for the hotel, hospitality, and tourism industries. Over 5,300 customers—primarily mid-sized, owner-managed hotels in the 3- to 4-star segment—use DIRS21 across Germany, Austria, and Switzerland. With 110 team players based in Wernau (Stuttgart/Essen region) and Leipzig, we embody the spirit of Swabian inventors, thinkers, and tinkerers.

To strengthen our team, we are looking for a Backend Developer (m/f/d) C# / .NET to join us in Wernau , either full- or part-time.

Tasks

As a Backend Developer (m/f/d), you will support our development team, particularly in the design, implementation, and documentation of API integrations for the hotel and tourism sector.

Your responsibilities include:

• Further development and new design of our workflow, database, and interface systems
• Integrating external interfaces into our software solutions
• Working with common protocols and data formats such as HTTP/S, XML, SOAP, REST, and JSON
• Ongoing development of our existing backend systems
• Ensuring scalability and performance
• Participating in agile development processes within sprint cycles
• Using our modern framework based on container technologies

# Tech-Stack

While we ensure browser compatibility, all new developments support only modern browsers, allowing us to focus on innovative features rather than legacy hacks.

Backend:

• .NET 6, MongoDB, CockroachDB, Aerospike
• NodeJS with Fastify or Express

General:

• Source control using Git on GitHub
• CI/CD pipelines
• Docker and Kubernetes

Requirements

Your Profile – Hard Skills

• A degree in Computer Science/Media Informatics or an excellent IT vocational qualification
• Strong programming skills in C#, .NET, and SQL
• Solid understanding of broad technology stacks for data-centric development (e.g. relational and NoSQL databases, data-driven architectures, APIs)
• Familiarity with container technologies such as Docker and Kubernetes
• Ideally, experience with agile project work (SCRUM)
• Proficient English skills (at least C1 level)

Your Profile – Soft Skills

• Strong analytical and conceptual thinking, with the ability to quickly understand complex issues
• An affinity for analysis and pattern recognition
• Strong problem-solving skills and a _get_-it-done mentality
• Willingness and ability to share knowledge internally
• A true team player in an agile development environment (SCRUM)
• Readiness to take responsibility and work independently

Benefits

Beyond technical skills, it’s just as important to us that you’re a good fit for our team: someone who brings energy and enthusiasm to the table. As part of our GoodWork concept, we offer:

• A modern working environment with flexible structures and open doors
• A modern leadership culture: flat hierarchies and appreciation across all levels
• Independent and varied tasks in a young, innovative company
• Comprehensive onboarding and ongoing, high-quality training
• Work-life balance: flexible hours, remote work, a children’s room in the office for extra flexibility
• Free coffee, lunch, fruit, and soft drinks
• Team-building activities, company events, and a lounge with a PlayStation, etc.
• Additional benefits: supplementary health insurance and company pension scheme
• Fitness perks: gym membership via EGYM Wellpass

We expect you to be proactive, demand high standards from your own work, and be eager and brave enough to grow professionally and personally. Our vibrant and fair corporate culture has earned us recognition as one of Germany’s top employers.

Interested? We look forward to hearing from you!

Please send your application to Linda Syrbe or get in touch with her directly by phone if you have any questions: +49 176 4787 5518