.NET/SQL Developer

About The Company

HPC AG has been serving communities and the environment since 1948. As a leading engineering firm, we specialize in a wide range of technical disciplines including soil and groundwater consulting, mineral and drinking water, construction ground and geotechnics, urban water management, waste management, flora and fauna, permitting procedures, geothermal energy, building deconstruction, site assessments, occupational safety, raw materials, road planning, construction supervision, and more. Our commitment to sustainability guides us as we develop innovative solutions for land recycling, environmental protection, safety, and infrastructure development. We operate across borders with an interdisciplinary approach, combining international experience with engineering precision to deliver effective results for our clients and society at large.

About The Role

We are seeking a dedicated Software Developer (m/w/d) to join our team at HPC AG, either in Harburg (Schwaben) or Lübeck. This full-time, permanent position offers an exciting opportunity for experienced professionals or career changers with relevant backgrounds to contribute to the development and enhancement of our project information system, Prins.NET. As a key member of our IT team, you will be responsible for maintaining and expanding a vital platform that enables comprehensive project planning, management, documentation, and analysis. You will oversee the entire software stack, from database design and business logic to user interface development, ensuring seamless integration with internal systems and continuous improvement of the application.

Qualifications

• Multiple years of professional experience in software development, particularly with VB.NET (or strong knowledge of C# with willingness to work in VB.NET).
• Solid expertise in SQL Server and T-SQL, including index optimization, query analysis, and performance tuning.
• Experience in frontend development using WinForms, WPF, and/or ASP.NET.
• Proficiency in writing clean, maintainable code with clear separation of concerns, meaningful abstractions, and adherence to best practices such as Option Strict On.
• Familiarity with REST APIs, JSON, and integration with Microsoft Graph API.
• Knowledge of version control systems like Git and basic understanding of CI/CD pipelines.
• Structured, self-directed working style with the ability to analyze challenges thoroughly and develop sustainable solutions.
• Excellent command of German and good knowledge of English, both spoken and written.
  
  

Desirable but not essential are experience with Microsoft 365 / SharePoint integration, MSAL/OAuth, asynchronous programming, and performance optimization in data-intensive applications.

Responsibilities

• Continuously develop and maintain Prins.NET in VB.NET within the .NET Framework and .NET Core environments.
• Design, optimize, and maintain the SQL Server database schema, including writing stored procedures, T-SQL scripts, and implementing indexing strategies for performance enhancement.
• Take responsibility for the full development lifecycle, from data modeling and backend logic to designing intuitive user interfaces tailored to user requirements.
• Integrate internal systems and external interfaces, such as Microsoft 365, SharePoint, and Graph API, ensuring smooth data exchange and system interoperability.
• Refactor existing codebases to modernize and improve sustainability, focusing on incremental enhancements and technical debt reduction.
• Implement quality assurance measures through code reviews, automated tests, and comprehensive technical documentation to ensure high software standards.
• Collaborate closely with business units to understand their needs, challenge requirements, and translate them into effective technical solutions.
  
  

This role is not limited to maintenance; it offers an opportunity to influence architecture, introduce new features, and improve overall software quality.

Benefits

At HPC AG, we value our employees and provide a range of benefits to support their professional and personal growth. Enjoy engaging and diverse tasks that promote continuous learning, along with opportunities for career advancement. We foster a healthy work-life balance through flexible working hours, remote work options, and 30 days of annual leave, plus additional days off on Christmas Eve and New Year’s Eve. Our benefits package includes attractive perks such as bike leasing and corporate fitness programs, as well as comprehensive social security benefits. Join a well-connected team of motivated professionals from various disciplines, working in a collaborative and innovative environment that encourages initiative and creativity.

Equal Opportunity

HPC AG is committed to creating an inclusive work environment that values diversity and equal opportunity. We welcome applications from individuals of all backgrounds, regardless of gender, age, ethnicity, disability, or other characteristics protected by law. Our hiring decisions are based solely on qualifications, experience, and the potential to contribute to our company’s success. We believe that a diverse workforce enhances innovation and drives better solutions for our clients and community.