Software Developer – .NET, C# / VB.NET, Customer Projects

Aspire Software

.NET-Entwickler für geschäftskritische Hafen-, Logistik- und Beschaffungssoftware bei INPLAN. Kundenanforderungen aufnehmen, Anwendungen weiterentwickeln und Lösungen bis zur Abnahme begleiten.

Posted 8/14/2026full-timeMülheim • 🇩🇪 GermanyMid-LevelSeniorWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in .NET application development, including C# and VB.NET, with a strong focus on performance optimization and technical solution design. Proficient in database management with Oracle and MS SQL Server, and skilled in customer communication and requirement gathering.

Highest-signal resume keywords

C# DevelopmentVB.NET DevelopmentOracle Database ManagementMS SQL Server ManagementASP.NET

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

C#VB.NETSQLREST InterfacesSOAP InterfacesXMLHTMLCSSJavaScriptCode Reviews

Soft Skills

Customer CommunicationCoordination MeetingsTechnical DocumentationClear Communication

Tools & Technologies

DevExpressJQueryJiraConfluence

Industry Keywords

Logistics SoftwareERP SoftwareProcurement SoftwarePort SoftwareAI Tools

Tech Stack

Tools & technologies

ASP.NETERPJavaScriptjQueryMS SQL Server.NETOracleSOAPSQL

About the role

Key responsibilities & impact

Further development of productive .NET applications with new features, technical optimization and performance improvements
Implementation of change requests and new developments in coordination with project management and Professional Services
Design of technical solutions including effort estimation
Development and maintenance of REST and SOAP interfaces as well as XML and file import/export
Database-related work with Oracle and MS SQL Server, including queries, views and stored procedures
Conducting code reviews, technical documentation as well as release and deployment processes
Gather and refine requirements together with customers
Specify change requests functionally and technically, estimate effort and represent them in customer discussions
Independently conduct coordination meetings and product demos via video call or on-site
Communicate results clearly
Optional: Contribute to AI and automation topics

Requirements

What you’ll need

German at native level, spoken and written
Residence within a maximum radius of 60 km of Mülheim an der Ruhr
Good knowledge of C# or VB.NET
Confident manner in customer-facing conversations
Several years of professional experience in software development in a corporate environment
Good knowledge of .NET, C# and/or VB.NET
Experience with large-scale, production-deployed applications
Good SQL skills with Oracle and/or MS SQL Server
Solid web and integration fundamentals: ASP.NET, HTML, CSS, JavaScript and XML
Good English for collaboration within the Valsoft Group
Advantageous: Experience with DevExpress, jQuery or comparable UI frameworks
Advantageous: Practical use of AI tools in development
Advantageous: Experience with logistics, port, ERP or procurement software
Advantageous: Proficiency with Jira and Confluence

Benefits

Comp & perks

Products that are used by well-known customers in business-critical environments
Direct customer contact and visible impact of your work
Short decision-making paths and individual responsibility from day one
Hybrid working with a fixed location in Mülheim an der Ruhr
Training and development, including on current AI topics
Long-term prospects in an established company within an international corporate structure