(Senior) Fullstack .NET Developer (m/f/d)

Cyber-Solutions Software GmbH; Eferding; Hybrid; EUR 40,000 - 48,000; Full time

Benefits offered by this job

Hybrid work

38.5-hour week

Claude Code from day one

Direct management access

Training & certifications

Job summary

Cyber-Solutions Software GmbH, an Austrian software agency in Eferding near Linz, seeks a Senior Fullstack .NET Developer to design and build web apps using C#/.NET, Azure, and CMS platforms. You will translate Figma designs, integrate Umbraco or Kentico, and contribute AI features.

You will work in a hybrid setup with direct customer contact, CI/CD, and an AI-first development workflow. The ideal candidate has 3+ years in C#/.NET, German B2 (min), and a passion for hands-on coding and quality.

Qualifications

• 3+ years of professional software development with C#/.NET.
• German language skills at least B2 and good English.
• Experience with Azure PaaS and deployment/monitoring.
• Hands-on with CMS platforms Umbraco or Kentico.

Responsibilities

• Design and develop web applications using C#/.NET (ASP.NET Core) and Azure PaaS.
• Translate Figma designs into reusable, pixel-perfect components.
• Integrate and expand CMS platforms (Umbraco or Kentico).
• Integrate AI features via Claude API and MCP.
• Work with CI/CD and perform code reviews.
• Interface with customers from request to go-live.
• Shape AI-first development workflow with Claude Code and MCP.

Skills

C#/.NET

Azure

German (B2)

AI-driven development

Tools

Umbraco

Kentico

Figma

Job description

(Senior) Fullstack .NET Developer (m/f/d)

Who We Are

Cyber-Solutions Software GmbH is a software agency with around 15 people in Eferding, 20 minutes from Linz. We build web platforms, portals, and CMS solutions for enterprise clients in energy, industry, and logistics, including VERBUND, EVN, and TGW Logistics. Technologically, we live and breathe .NET, Azure, Umbraco, and Kentico. We are a Microsoft, Umbraco Platinum, and Kentico partner and a member of the Anthropic Claude Partner Network.

AI Is Not a Buzzword for Us

We build AI-first, and we mean it: Claude Code is a standard tool for us, like Git, not a gimmick for Friday afternoons. Our in-house MCP servers connect Claude to our coding standards, our ERP, and our operations logs. With the AI Essentials Toolkit for Umbraco, we build our own AI products, and in client projects we integrate AI features directly via the Claude API. If you want to see what AI-assisted development actually looks like day to day, instead of just reading about it: welcome.

Your responsibilities:

• You will design and develop web applications using C#/.NET (ASP.NET Core) and Azure PaaS (App Services, Functions, SQL, Service Bus, etc.)
• You translate Figma designs into clean, reusable components that are pixel-perfect and responsive
• You will integrate and expand CMS platforms (Umbraco or Kentico, depending on the project)
• You'll integrate AI features into client projects (Claude API, MCP, Agents)
• You'll work with CI/CD (Azure DevOps, GitHub Actions), perform code reviews, and write testable code
• You'll be in direct contact with our customers, from the initial request through to the go-live
• You'll play an active role in shaping our AI-first development workflow (Claude Code, Skills, MCP)

Your profile:

• At least 3 years of professional experience in software development with C#/.NET; there is no upper limit—senior candidates are expressly welcome
• Practical experience with Azure (PaaS services, deployment, monitoring)
• Proficiency in using Figma (design handoff, components, design tokens)
• You see AI-driven development as a way to enhance your craft and want to play an active role in shaping it
• Very good German (at least B2) and good English
• An independent, solution-oriented approach to work and a passion for direct communication with customers
• Nice to have: Experience with one of our CMS platforms (Umbraco, Kentico, or Truvio PIM)
• Nice to have: React, Vue, or Blazor
• Nice to have: Hands-on experience with Claude Code, the Claude API, or MCP
• Nice to have: DevOps expertise (Infrastructure as Code, Bicep, Pipelines)

What we offer:

• Hybrid work: Office in Eferding plus home office, flexible scheduling
• 38.5-hour week according to the IT collective agreement
• Claude Code from day one, plus our own MCP infrastructure and skills library
• Enterprise projects with visible impact instead of anonymous ticket factories
• Short decision-making paths and direct contact to management
• Time and budget for further training and certifications (Microsoft, Umbraco and Co)
• Up-to-date hardware and tooling as needed
• According to the IT collective bargaining agreement, at least 3,954 euros gross per month (ST1 standard level, 14 payments per year). In reality: 57,000 to 75,000+ euros gross per year, depending on experience.