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ARZ Haan AG Tech Stack

Healthcare billing platform serving 16,000+ providers across Germany

IT Services and IT Consulting Haan, Nordrhein-Westfalen 1,001–5,000 employees Public Company

ARZ Haan AG operates a billing and data services platform for the German healthcare sector, processing claims for roughly 16,000 customers across 30+ medical specialties. The company is mid-way through a large-scale modernization—moving from legacy applications toward .NET and cloud infrastructure (Azure, LangChain, OpenAI API)—while maintaining mission-critical compliance and audit controls. Hiring velocity is decelerating, but engineering and finance roles remain active, reflecting the dual pressure of legacy system support and forward-looking software development.

Tech Stack 35 technologies

Core StackC# Dynamics 365 .NET Azure DevOps Jira Confluence SQL Server Linux LangChain Hugging Face Python PyTorch NET Core REST HTML CSS Microsoft Office REST API Blazor CI/CD Informix Excel PowerPoint Outlook Word VMware vSphere Proxmox CentOS Debian OpenAI API+3 more

What ARZ Haan AG Is Building

◆Challenges

Modernizing technology for four medical business areas
Monitoring for system stability
Complex support cases
Optimizing existing processes
Billing discrepancy resolution
Maintaining legacy applications
Ensuring effective internal controls
Monitoring remediation of audit findings
Managing information risk compliance
Reconcile invoice discrepancies

▲Active Projects

Modernization of technology for four medical business areas
Developing modern web applications in .net environment
Modernization roadmap
Software architecture modernization
Modernizing existing software architecture
Developing software solutions for healthcare market
Continuous optimization of support processes
Digitization measures
Internal it documentation development
Entwicklung von organisationsabläufen

Hiring Activity

Decelerating70 roles · 10 in 30d

Department

Engineering

19

Finance

19

Support

13

Ops

7

Healthcare

6

Data

3

Sales

2

Product

1

Seniority

Junior

24

Mid

23

Intern

10

Lead

7

Manager

4

Senior

2

Notable leadership hires: Helpdesk Lead, Team Lead

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About ARZ Haan AG

ARZ Haan AG is a public holding company specializing in billing services and healthcare IT solutions. Over five decades, the firm has built core competency in claims processing and settlement services, supporting more than 16,000 healthcare organizations across Germany. The company operates as a holding with subsidiary businesses and over 850 staff. Current strategy centers on digital transformation: migrating legacy billing logic to modern platforms (.NET, Azure, cloud infrastructure) while developing new eHealth and software offerings (e-prescription support, intelligent software solutions). The firm faces typical modernization challenges—monitoring system stability, managing legacy application maintenance, and ensuring billing accuracy and regulatory compliance—while scaling new digital products.

HeadquartersHaan, Nordrhein-Westfalen

Company Size1,001–5,000 employees

Hiring MarketsGermany

Frequently Asked Questions

What tech stack does ARZ Haan AG use?

Primary stack: .NET Core, C#, SQL Server, Azure DevOps. Infrastructure: Azure, VMware vSphere, Proxmox. Emerging: LangChain, Hugging Face, OpenAI API, PyTorch for AI-driven solutions. Legacy systems include Informix.

How many employees does ARZ Haan AG have?

Over 850 staff across the operating company. Largest teams: engineering (19), finance (19), support (13). Organization size range: 1,001–5,000 (public company with multiple subsidiaries).