Friedhelm Matten - Freelancer | FHIR Profiling and Validation

Q: Where is Friedhelm based?

Friedhelm is based in Wedemark, Germany .

Q: What languages does Friedhelm speak?

Friedhelm speaks the following languages: German (Native), English (Intermediate) .

Q: How many years of experience does Friedhelm have?

Friedhelm has at least 37 years of experience. During this time, Friedhelm has worked in at least 10 different roles and for 21 different companies . The average length of individual experience is 2 years and 7 months . Note that Friedhelm may not have shared all experience and actually has more experience.

Q: What is Friedhelm's latest experience?

Friedhelm's most recent position is Project at Deutsche Gesetzliche Unfallversicherung .

Q: What companies has Friedhelm worked for in recent years?

In recent years, Friedhelm has worked for Deutsche Gesetzliche Unfallversicherung , Cloudeatery GmbH / Yobst GmbH , Cash Cow Farmers GmbH , and ISCaD GmbH - Independent Software Consulting and Development .

Q: Which industries is Friedhelm most experienced in?

Friedhelm is most experienced in industries like Information Technology (IT) , Professional Services , and Healthcare . Friedhelm also has some experience in Education , Government and Public Administration , and Agriculture .

Q: Which business areas is Friedhelm most experienced in?

Friedhelm is most experienced in business areas like Information Technology (IT) , Product Development , and Business Intelligence . Friedhelm also has some experience in Research and Development (R&D) , Quality Assurance (QA) , and Project Management .

Q: Which industries has Friedhelm worked in recently?

Friedhelm has recently worked in industries like Information Technology (IT) , Professional Services , and Agriculture .

Q: Which business areas has Friedhelm worked in recently?

Friedhelm has recently worked in business areas like Information Technology (IT) , Product Development , and Business Intelligence .

Recommended expert

Wedemark, Germany

Experience

May 2025 - Nov 2025

7 months

Remote

Project

Deutsche Gesetzliche Unfallversicherung

Collaborated on HL7 FHIR profiling and validation
Created CodableConcepts (code/value systems), extensions, and profiles like Composition and Bundle
Extensive instance creation and validation
Used Simplifier.net, Forge, and the FHIR Java Validator

Nov 2023 - Oct 2024

1 year

Project

Cloudeatery GmbH / Yobst GmbH

Integration of kitchens and online orders via Uber, Wolt, and Lieferando
PostgreSQL database optimization
DevOps infrastructure setup with WireGuard and GitLab
Extensive Python programming

Jan 2021 - Apr 2025

4 years 4 months

Project

Cash Cow Farmers GmbH

Setup of a ZFS-based NAS system with decentralized replication
Setup of a Samba server with ACLs for macOS, Windows, and Linux
Development of analysis and administration applications
Migration to an object storage with MinIO Cloud

Jan 2017 - Dec 2020

4 years

Project

Herzzentrum Leipzig

Collection of clinical data from HL7 systems (KIS), HLM systems, legacy databases, and iMedOne
Setup of a MirthConnect server to process HL7 A01–A013 and ORU-R01 messages
Expanded to include quality assurance data for pediatric cardiology and surgical data
Storage in HDF5, Redis, Parquet, and SQLite
Correlation with patient-related data streams and metadata collection
Development of a web application for automatic control and correction of quality assurance data

Mar 2014 - Oct 2014

8 months

External Consultant and Shareholder

HealthSafe24 GmbH

Jan 2013 - Feb 2014

1 year 2 months

CIO and Partner

HealthSafe24 GmbH

Oct 2009 - Mar 2012

2 years 6 months

Hanover, Germany

External IT Consultant, Software Architect/Developer

Medizinische Hochschule Hannover

Oct 2007 - Oct 2009

2 years 1 month

Hanover, Germany

Research Associate, Software Architect/Developer

Medizinische Hochschule Hannover

Planning and development of a web-based analysis system for clinical data

Oct 2007 - Mar 2012

4 years 6 months

Project

Niedersächsisches Studieninstitut

Planning and development of an intranet web application for creating and managing online catalogs
Generation of print-ready catalogs for a printing company

Dec 2003 - Jan 2009

5 years 2 months

Project

ISCAD GmbH

CDV (Clinical Data View): Development of a data structure to manage and analyze complex clinical data
NICOLAI migration tool: Consolidation of clinical data from subsystems with heterogeneous database structures into the CDV

Jan 2003 - Jun 2006

3 years 6 months

Project

Sanitätshaus

Planning an online presentation with database connection
Developing an online ordering system and a workflow-based order processing
Implementing an online staff management and a wheelchair management system connected to health insurance systems
Working with health insurance billing systems

Apr 2000 - Present

25 years 11 months

Managing Director and Software Architect

ISCaD GmbH - Independent Software Consulting and Development

Jan 2000 - Dec 2007

8 years

Project

Region Hannover

Developing a CMS and an image database
Building various online applications
Transmitting and processing A01–A013 patient and ORU-R01-LIS messages

Dec 1999 - Sep 2000

10 months

Project

Deutsche Telekom AG

Internet portal for an electrical wholesaler on behalf of Deutsche Telekom

Dec 1998 - Dec 2004

6 years 1 month

Project

Deutscher Industrie- und Handelskammertag

Implementing the first German environmental company database for BUND
Developing additional web applications for DIHT Bonn and ITUT Leipzig

Oct 1998 - Nov 1999

1 year 2 months

Project

Informix Deutschland GmbH

Management of a data warehouse
Intranet application using an applet and Swing GUI
Use of an Informix database and Sun Directory Server
Web application for online data collection and analysis of children with heart conditions

May 1998 - May 2007

9 years 1 month

Managing Director and Software Architect

Phoenix Database Informationstechnologie GmbH

Development of web applications with database integration

Sep 1997 - Apr 1998

8 months

Hanover, Germany

IT Consultant, Software/Database Developer, System Administrator

Technologie-Zentrum Hannover GmbH

Consulting and development in the print and media sector
System administration

Nov 1996 - Aug 1997

10 months

Duisburg, Germany

IT Consultant, Software/Database Developer

Pageline Layout & Satz GmbH

Consulting and development in the print and media sector

Nov 1995 - Oct 1996

1 year

Duisburg, Germany

IT Consultant, Software/Database Developer

Dahmen & Morgenstern

Consulting and development in the print and media sector

Oct 1994 - Oct 1995

1 year 1 month

Bad Oeynhausen, Germany

Research Associate

Heart and Diabetes Center NRW

MRI
Software and database development

Dec 1993 - Sep 1994

10 months

Freelance Software Developer

Dec 1988 - Nov 1993

5 years

Research Associate

University of Duisburg-GH

Mathematical methods in physics
Vectorizing Fortran programs
Assembly programming

Industries Experience

See where this freelancer has spent most of their professional time. Longer bars indicate deeper hands-on experience, while shorter ones reflect targeted or project-based work.

Experienced in Information Technology (28.5 years), Professional Services (27 years), Healthcare (17 years), Education (9.5 years), Government and Administration (8 years), and Agriculture (4.5 years).

Information Technology

Professional Services

Healthcare

Education

Government and Administration

Agriculture

Business Areas Experience

The graph below provides a cumulative view of the freelancer's experience across multiple business areas, calculated from completed and active engagements. It highlights the areas where the freelancer has most frequently contributed to planning, execution, and delivery of business outcomes.

Experienced in Information Technology (37 years), Product Development (27 years), Business Intelligence (10.5 years), Research and Development (8 years), Quality Assurance (4.5 years), and Project Management (0.5 years).

Information Technology

Product Development

Business Intelligence

Research and Development

Quality Assurance

Project Management

Summary

Software architect and data analyst with over 30 years of experience in the development, integration, and analysis of complex IT and healthcare data systems. Many years of work in clinical and public health settings focusing on interoperability, data consolidation, and quality assurance.

Extensive experience in processing and analyzing structured and unstructured clinical data, as well as integrating heterogeneous source systems. Very deep analytical skills backed by a solid background in physics and mathematics. Structured, solution-oriented work style with high perseverance and focus on sustainable, practical solutions.

Skills

Stakeholder Management
Fhir Profiling
Clinical Systems
Data Architecture
Data Analysis
Quality Assurance
Metadata
Migration
Standardization
Health It

Programming Languages

Python
Java
Javascript
Bash

Standards & Interfaces

Hl7 V2
Fhir
Dicom

Databases

Postgresql
Oracle
Mysql
Mssql
Sqlite

Data Formats / Storage

Hdf5
Parquet
Redis

Frameworks & Tools

Mirthconnect
Django
Flask

Devops & Infrastructure

Gitlab
Docker
Proxmox
Vmware
Minio

Operating Systems

Linux (Debian, Ubuntu)
Windows
Macos

Languages

German

Native

English

Intermediate

Education

Oct 1982 - Jun 1989

Gerhard-Mercator-Universität Duisburg

Diploma · Mathematics · Duisburg, Germany · very good

Oct 1980 - Jun 1988

Gerhard-Mercator-Universität Duisburg

Diploma · Physics · Duisburg, Germany · good

Profile

Created

February 2026

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Frequently asked questions

Do you have questions? Here you can find further information.

Where is Friedhelm based?

Friedhelm is based in Wedemark, Germany.

What languages does Friedhelm speak?

Friedhelm speaks the following languages: German (Native), English (Intermediate).

How many years of experience does Friedhelm have?

Friedhelm has at least 37 years of experience. During this time, Friedhelm has worked in at least 10 different roles and for 21 different companies. The average length of individual experience is 2 years and 7 months. Note that Friedhelm may not have shared all experience and actually has more experience.

What roles would Friedhelm be best suited for?

Based on recent experience, Friedhelm would be well-suited for roles such as: Project, External Consultant and Shareholder, CIO and Partner.

What is Friedhelm's latest experience?

Friedhelm's most recent position is Project at Deutsche Gesetzliche Unfallversicherung.

What companies has Friedhelm worked for in recent years?

In recent years, Friedhelm has worked for Deutsche Gesetzliche Unfallversicherung, Cloudeatery GmbH / Yobst GmbH, Cash Cow Farmers GmbH, and ISCaD GmbH - Independent Software Consulting and Development.

Which industries is Friedhelm most experienced in?

Friedhelm is most experienced in industries like Information Technology (IT), Professional Services, and Healthcare. Friedhelm also has some experience in Education, Government and Public Administration, and Agriculture.

Which business areas is Friedhelm most experienced in?

Friedhelm is most experienced in business areas like Information Technology (IT), Product Development, and Business Intelligence. Friedhelm also has some experience in Research and Development (R&D), Quality Assurance (QA), and Project Management.

Which industries has Friedhelm worked in recently?

Friedhelm has recently worked in industries like Information Technology (IT), Professional Services, and Agriculture.

Which business areas has Friedhelm worked in recently?

Friedhelm has recently worked in business areas like Information Technology (IT), Product Development, and Business Intelligence.

What is Friedhelm's education?

Friedhelm holds a Master in Mathematics from Gerhard-Mercator-Universität Duisburg and a Master in Physics from Gerhard-Mercator-Universität Duisburg.

What is the availability of Friedhelm?

Friedhelm will be available from February 2026.

What is the rate of Friedhelm?

Friedhelm's rate depends on the specific project requirements. Please use the Meet button on the profile to schedule a meeting and discuss the details.