Friedhelm Matten-Freelancer | FHIR Profiling and Validation
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Experience
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
Project
Cloudeatery GmbH / Yobst GmbH
- Connected kitchens and online orders via Uber, Wolt and Lieferando
- Optimized PostgreSQL database
- Built a DevOps infrastructure with WireGuard and GitLab
- Extensive Python programming
Project
Cash Cow Farmers GmbH
- Set up a ZFS-based NAS system with decentralized replication
- Configured a Samba server with ACL for macOS, Windows and Linux
- Developed analysis and administration applications
- Migrated to object storage with MinIO cloud
Project
Herzzentrum Leipzig
- Captured clinical data from HL7 systems (KIS), HLM systems, legacy databases and iMedOne
- Set up a MirthConnect server to process HL7 A01–A013 and ORU-R01 messages
- Extended with quality assurance data for pediatric cardiology and cardiac surgery
- Stored data in HDF5, Redis, Parquet and SQLite
- Correlated with patient-related data streams and captured metadata
- Developed a web application for automatic control and correction of quality assurance data
External consultant and shareholder
HealthSafe24 GmbH
CIO and shareholder
HealthSafe24 GmbH
External IT consultant, software architect/developer
Medizinische Hochschule Hannover
Research associate, software architect/developer
Medizinische Hochschule Hannover
- Planning and development of a web-based evaluation system for clinical data
Project
Niedersächsisches Studieninstitut
- Planning and development of an intranet web application for creating and managing online catalogs
- Generating print-ready catalogs for a printing company
Project
ISCAD GmbH
- CDV (Clinical Data View): development of a data structure for managing and analyzing complex clinical data
- Migration tool NICOLAI: consolidation of clinical data from subsystems with heterogeneous database structures into the CDV
Project
Medical supply store
- Planning an online presentation with database integration
- Developing an online ordering system and workflow-based order processing
- Implementing an online employee management system and a wheelchair management system integrated with health insurance systems
- Working with health insurance billing systems
Managing Director and Software Architect
ISCaD GmbH - Independent Software Consulting and Development
Project
Hanover Region
- Development of a CMS and an image database
- Setting up various online applications
- Transmission and further processing of A01–A013 patient messages and ORU-R01-LIS messages
Project
Deutsche Telekom AG
- Internet portal for an electrical wholesaler on behalf of Deutsche Telekom
Project
Association of German Chambers of Industry and Commerce
- Implementation of the first German environmental company database on behalf of BUND
- Development of further web applications for DIHT Bonn and ITUT Leipzig
Project
Informix Deutschland GmbH
- Managed a data warehouse
- Intranet application using an applet and Swing GUI
- Used an Informix database and Sun Directory Server
- Web application for online data collection and analysis for children with heart disease
Managing Director and Software Architect
Phoenix Database Informationstechnologie GmbH
- Developed web applications with database connectivity
IT Consultant, Software/Database Developer, System Administrator
Technologie-Zentrum Hannover GmbH
- Consulted and developed in the printing and media sector
- System administration
IT Consultant, Software/Database Developer
Pageline Layout & Satz GmbH
- Consulted and developed in the printing and media sector
IT Consultant, Software/Database Developer
Dahmen & Morgenstern
- Consulted and developed in the printing and media sector
Research Associate
Heart and Diabetes Center NRW
- MRI
- Software and database development
Freelance Software Developer
Freelance Software Developer
Research Associate
University of Duisburg-GH
- Mathematical methods in physics
- Vectorization of Fortran programs
- Assembly programming
Industry experience
See where this freelancer has spent most of their professional time.
Experienced in Information Technology, Professional Services, Healthcare, Education, Government and Administration, and Agriculture.
Business area experience
See which departments and functions this freelancer has contributed to most.
Experienced in Information Technology, Product Development, Business Intelligence, Research and Development, Quality Assurance, and Project Management.
Summary
Software architect and data analyst with over 30 years of experience in developing, integrating and analyzing complex IT and healthcare data systems. Many years working in clinical and public health settings with a focus on interoperability, data consolidation and quality assurance.
Extensive experience in processing and evaluating structured and unstructured clinical data as well as integrating heterogeneous source systems. Very strong analytical depth due to a solid background in physics and mathematics. Structured, solution-oriented approach with high perseverance and a focus on sustainable, practical solutions.
Skills
- Stakeholder Management
- Fhir Profiling
- Clinical Systems
- Data Architecture
- Data Analysis
- Quality Assurance
- Metadata
- Migration
- Standardization
- Healthcare 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
Education
Gerhard-Mercator-Universität Duisburg
Diploma · Mathematics · Duisburg, Germany · very good
Gerhard-Mercator-Universität Duisburg
Diploma · Physics · Duisburg, Germany · good
Statistics
Experience
Global experience
Expertise
Qualifications
Profile
Frequently asked questions
Have questions? Find more information here.
Friedhelm is based in Wedemark, Germany and can operate in on-site, hybrid, and remote work models.
Friedhelm speaks the following languages: German (Native), English (Intermediate).
Friedhelm has at least 38 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 8 months. Note that Friedhelm may not have shared all experience and actually has more experience.
Based on recent experience, Friedhelm would be well-suited for roles such as: Project, External consultant and shareholder, CIO and shareholder.
Friedhelm's most recent position is Project at Deutsche Gesetzliche Unfallversicherung.
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.
Friedhelm is most experienced in industries like Information Technology, Professional Services, and Healthcare. Friedhelm also has some experience in Education, Government and Administration, and Agriculture.
Friedhelm is most experienced in business areas like Information Technology, Product Development, and Business Intelligence. Friedhelm also has some experience in Research and Development, Quality Assurance, and Project Management.
Friedhelm has recently worked in industries like Information Technology, Professional Services, and Agriculture.
Friedhelm has recently worked in business areas like Information Technology, Product Development, and Business Intelligence.
Friedhelm holds a Master in Mathematics from Gerhard-Mercator-Universität Duisburg and a Master in Physics from Gerhard-Mercator-Universität Duisburg.
The availability of Friedhelm needs to be confirmed.
Daily rate distribution
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Average rates for similar positions
Rates are based on recent contracts and do not include FRATCH margin.
The average daily rate is the mean of all daily rates from recent contracts of comparable freelancers on our platform.
The median daily rate is the middle value of all daily rates — half of comparable freelancers charge less, half charge more. Unlike the average, it is barely affected by outliers.
Calculated based on our freelancers’ daily rates as of 7 Sep 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
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