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Windows .Net Software Engineer

Madfish

Madfish

Software Engineering
Europe
Posted on Nov 19, 2025

Join our dynamic team at CoreWillSoft GmbH as a Software Engineer specializing in Windows .Net applications! We focus on innovative security solutions for critical facilities and infrastructures, building automation, and IoT physical access control software.

We are looking for a skilled Software Engineer to help us maintain and develop Windows-based applications. Our Agile team, based in various locations with headquarters in Bonn, Germany, handles the full software development lifecycle; from initiation to implementation and operation of our specialized software solutions.

This is an excellent chance to work on important projects involving high-security hardware and technology in a creative, international setting. You will collaborate with a talented team and make a significant impact on our customers' businesses.

Location:

  • Remote
  • On-site in Bonn

Responsibilities:

  • Develop, maintain, and enhance Windows-based desktop applications using .Net 2.6.1 – 6.0.
  • Implement CI/CD pipelines for development and QA processes.
  • Act as a liaison between the customer and the development team, collecting and synthesizing feedback into actionable tasks.
  • Ensure on-time delivery of high-quality products.
  • Collaborate with cross-functional teams, including engineering, sales, marketing, and support, to deliver successful projects.
  • Identify potential risks and issues within the project and propose mitigation strategies.
  • Maintain and develop DLLs written in C++.

We offer:

  • Great customer impact: the solutions you deliver will be used by thousands of large and small businesses.
  • Ability to shape the product, working, and delivery process.
  • Great team spirit and close collaboration.
  • Agile and innovative environment.
  • Working on the latest hardware.

Your skills:

  • Proven experience in Windows .Net Desktop application development.
  • Familiarity with System.Reactive and its extensions for reactive programming.
  • Experience with System.Security.Cryptography for cryptographic operations.
  • Basics knowledge of C++ and DLL development.
  • Experience in implementing CI/CD pipelines.
  • Excellent communication and collaboration skills.
  • Advanced Business English language knowledge.
  • Good analytical skills, oriented on continuous process improvement.
  • Responsibility for customer/partner relation growth.

Nice to have:

  • Experience with IoT products in building automation and physical access control.
  • Mastery Degree in Computer Science or related field.
  • Understanding of general security concepts.
  • German language skills.