Senior Softwareentwickler C# / .NET (m/w/d)

About

For one of our clients, we are looking for a Senior Software Developer (m/f/d) with a focus on C# / .NET for permanent employment as soon as possible. We are not looking for a pure implementer, but for an experienced personality who goes technically beyond the average and actively takes responsibility - both in development and at the architectural level.

Responsibilities

• Development and further development of complex applications based on C# and .NET (.NET Core / .NET 8+)
• Co-design and further development of the software architecture (e.g., modular architectures, Clean Architecture, Microservices)
• Technical evaluation of requirements and development of sustainable solution approaches
• Ensuring code quality, performance, maintainability, and scalability
• Use of modern development approaches such as Dependency Injection, Clean Code, SOLID principles
• Optional: Taking on professional responsibility, e.g., mentoring developers or a technical lead role
• Close collaboration with internal stakeholders such as Product Owners, QA, and Infrastructure

Qualifications

• Several years of professional experience in C#/.NET development at a senior level
• Very good knowledge in:
  • C#, .NET Core / .NET Framework
  • ASP.NET / Web APIs
  • Entity Framework / ORM concepts
  • Relational databases (e.g., SQL Server)
• Sound experience in software architecture and design patterns
• Ideally, knowledge in areas such as Cloud, CI/CD, Docker, or distributed systems
• Initial experience in professional leadership, technical responsibility, or architectural decisions is an advantage
• Analytical mindset, independent work, and high quality standards
• Very good German language skills, both written and spoken

Benefits

• Permanent employment with long-term perspective
• Challenging projects with real design freedom at the technical level
• Home office option and flexible working hours
• Modern development environment and professional tool landscape
• Flat hierarchies and short decision-making processes
• Attractive salary model and additional benefits

This position is explicitly aimed at experienced developers who want more than just implementing features and want to actively contribute their expertise.

We look forward to your application as Senior Software Developer C# / .NET (m/f/d) in Lübbecke.

SThree_Germany is acting as an Employment Agency in relation to this vacancy.