Ernst Höfler - E-Invoicing Process Developer 21 Years

🚀 FRATCH GPT 2.0 - Find freelancers with a single prompt. With rate benchmark.

Recommended expert

Munich, Germany

Check rate

Experience

Jan 2025 - Present

1 year 10 months

Germany

Support/Development/Consulting – Process Development, E-Invoicing, XRechnung, ZUGFeRD

Support and further development of a complex process for creating XML documents for electronic invoices / E-Invoicing (XRechnung, ZUGFeRD)
Automation of operational processes, process development and optimization
Development of frontend applications with MS Power Apps
Porting SQL Server 2016 to SQL Server 2022
SQL Server database administration

Mar 2024 - Jul 2024

5 months

Design/Development/Consulting – Digital Print Products, Configuration and Calculation

Design, development and further development of custom software (backend) for an online portal for configuring and calculating digital print products
Review and expansion of the database structure
Implementation of a new configuration and calculation process
Optimization/automation of process workflows
Performance analyses and database tuning
Design and development of an admin client (MS Access) for maintaining and managing master data
Data provision for the web frontend
Project management with Taiga

Nov 2023 - Mar 2024

5 months

Design/Development/Consulting – Calculation of Sales Prices

Further development of an application for calculating sales prices for any items
Connection of an existing inventory data system (MS SQL Server)

Sep 2023 - Dec 2024

1 year 4 months

Design/Development/Consulting – Process Development, E-Invoicing, XRechnung, ZUGFeRD

Design, development and further development of various routines for handling business processes with SQL Server, MS Access and MS Outlook
Automation of operational processes (office automation, electronic invoices / E-Invoicing, XRechnung, ZUGFeRD)

Feb 2022 - Jul 2023

1 year 6 months

Design/Development/Consulting – Process Development, E-Invoicing, XRechnung, ZUGFeRD

Design, development and further development of custom software for handling and optimizing business processes with SQL Server, MS Access and MS Outlook
Design and further development of a process for creating XML documents for electronic invoices (XRechnung, ZUGFeRD)
SQL Server database administration
Support and further development of a Data Warehouse
Automation of operational processes, process development and optimization
Configuration of web applications
Administration and monitoring of a CRM application
Performance analyses and database tuning
Porting SQL Server 2014 to SQL Server 2019

Mar 2021 - Jun 2021

4 months

Design/Development/Consulting – Sales Commission Management

Design, development and further development of an application for recording, maintaining and analyzing commission data for sales employees
Connection of an existing warehouse data system via ODBC

Oct 2019 - Dec 2020

1 year 3 months

Design/Development/Consulting – E-Commerce, Big Data

Application development for a complex E-Commerce system (Couponing System, Online Shops, Campaign Automation) to implement GDPR requirements
Implementation of a complex concept for deleting personal data in a Big Data environment
Creation of tools for process optimization and automation (Unix, Oracle)
Creation of interfaces for monitoring tools and processes

Apr 2018 - Feb 2023

4 years 11 months

Design/Development/Consulting – Process Development and Optimization, Database Administration

Design, development and further development of custom software for managing and supporting databases with SQL Server, MySQL, MS Access and MS Outlook
Design and further development of an existing Access application (client-server) for recording, maintaining and analyzing database administration data
Optimization of database operations (Oracle, MS SQL Server, MySQL, PostgreSQL)
SharePoint integration to provide database administration data
Automation of operational processes, process development and optimization
Planning and implementation of a patch strategy
Extension of database monitoring with SCOM and OEM
Design and implementation of a monitoring solution for MySQL databases
Performance analyses and database tuning
Design and new development of an Access application (client-server) for recording, maintaining and analyzing asset information for MySQL databases

Apr 2018 - Nov 2021

3 years 8 months

Design/Development/Consulting – Kopano Mail Server

Design, installation and configuration of a Kopano Mail Server (with Postfix and Fetchmail), including WebApp
Operations and support

Mar 2018 - Feb 2023

5 years

Design/Development/Consulting – Event Management

Design, development and further development of an existing application for recording, maintaining and analyzing event management data
Installation and configuration of SQL Server 2017
Porting of the database and backend application from SQL Server 2008 to SQL Server 2017
Performance tuning
Porting of the frontend application from Windows 7/MS Office 2010 to Windows 10/MS Office 2016
Integration of new functionalities
Connection of a media database
Incident and CR management with SharePoint
Project management

Apr 2016 - Jun 2016

3 months

Concept/Development/Consulting – Calculation of Sales Prices

Further development of an application for calculating sales prices for any items
Connection of an existing warehouse data system via ODBC

Feb 2015 - Nov 2015

10 months

Concept/Development/Consulting – Gastronomy, Fully Automated Cocktail Machine

Further development of an existing application for controlling a fully automated cocktail machine and for recording, maintaining and evaluating master and transaction data
General revision of the application
Performance tuning
Internationalization
Integration of new functionalities
Project management

Jul 2014 - Feb 2018

3 years 8 months

Concept/Development/Consulting – E-Commerce, Business Process Management

Partner and application support for a complex E-Commerce system (couponing system, online shops)
Online Quality Management and Business Process Management
Process support and optimization for promotion and coupon processing
Creation of tools for process automation (Unix, Oracle)
Implementation of various modules and reports for data analysis and evaluation (Oracle)
Creation of monitoring tools and processes
Third-level support for various applications

Feb 2014 - Jan 2015

1 year

Concept/Development/Consulting – SharePoint-Server

Design, installation and configuration of a SharePoint-Server (user management, web content management, collaboration, access deployment)
Operation and support

Dec 2013 - Jun 2015

1 year 7 months

Concept/Development/Consulting – Management of Price Comparison Data

Design and implementation of an application for recording, maintaining and evaluating price comparison data
Connection of an existing warehouse data system via ODBC
Excel export from MS Access

Mar 2012 - Jan 2014

1 year 11 months

Design/Development/Consulting – Supply Chain Management

Creation and further development of various backend components of an application for managing and maintaining master data in Supply Chain Management
Creation and optimization of queries, implementation of various analyses and exports (Access, Excel, SharePoint)
Creation of various interface components (Data Warehouse, SAP)
Rollout management and incident management

Mar 2011 - Feb 2018

7 years

Design/Development/Consulting – Event Management

Further development of an existing application for recording, maintaining and analyzing Event Management data
Migration to SQL Server as the backend database
Performance tuning
Integration of new functionalities
Incident and CR management with SharePoint
Project management

Sep 2010 - Dec 2017

7 years 4 months

Design/Development/Consulting – Zarafa Mail Server

Design, installation and configuration of a Zarafa Mail Server (with Postfix and Fetchmail), including WebApp
Operations and support

Jul 2005 - Jul 2014

9 years 1 month

Design/Development/Consulting – Construction Industry, Custom Software (ERP System)

Implementation of various modules for a system for centralized operational accounting / results accounting, cost recording, financial analysis, cost accounting, working time recording, investment management, subcontractor/supplier management, guarantees management and flat-rate tax recording
Extension of existing interfaces to SAP, Dynamics and Navision
Development of administration tools and complex analysis tools
Process administration
Third-level support for all applications
Migration of several databases from MS SQL Server 2000 to 2008

Industry experience

See where this freelancer has spent most of their professional time.

Experienced in Information Technology, Construction, Professional Services, Retail, Food and Beverage, and Manufacturing.

Information Technology

Construction

Professional Services

Retail

Food and Beverage

Manufacturing

Business area experience

See which departments and functions this freelancer has contributed to most.

Experienced in Information Technology, Operations, Project Management, Finance, Accounting, and Quality Assurance.

Information Technology

Operations

Project Management

Finance

Accounting

Quality Assurance

Skills

Specialized Knowledge

Design, Programming And Use Of Relational Databases
Application Development For Relational Databases
Business Process Optimization
E-Invoicing / Electronic Invoices (Xml, Xrechnung, Zugferd)
Design And Implementation Of Interface Programs
Performance Tuning For Relational Databases
Migration And Software Porting
Client-Server Solutions
Application Development (Design And Implementation)
Crm Systems (Customer Relationship Management)
Solaris/Unix/Sinix Shell Programming
Sharepoint / Sharepoint Server
Mail Servers (Kopano, Zarafa)
Design, Programming And Use Of Websites

Professional Focus Of The Last Projects

Agile Software Development
Development Of Various Applications In The Sql Server And Windows Environment
Development Of Business Processes For E-Invoicing (Electronic Invoices)
Implementation Of Custom Software (Windows, Ms Access, Vba, Sharepoint)
Further Development/Migration Of Access Databases (Various Areas Of Use)
Design And Implementation Of Interfaces (Oracle / Sql Server)
Business Process Optimization
Project Leadership / Project Management
Process Optimization / Monitoring In The E-Commerce Environment
Development Of Various Applications In The Oracle And Unix-/Solaris Environment
Customer Relationship Management
Online Quality Management / Business Process Management
Data Deletion (Big Data)

Databases

Ms Sql Server (Transact-Sql)
Oracle (Pl/Sql, Sql*Plus)
Ms Access
Mysql
Postgresql
Informix (Sql, Esql/C, 4gl Under Online And Se)

Operating Systems

Windows / Windows Server
Sunos (Solaris), Unix, Ubuntu
Ms-Dos

Programming Languages

Transact-Sql (Ms Sql Server)
Pl/Sql, Sql*Plus (Oracle)
Visual Basic (Vba, Ms Access, Ms Word, Ms Excel, Ms Outlook)
Sql, Esql/C, 4gl (Informix)
Shell (Solaris, Unix, Sinix, Ubuntu)
Ms-Dos Batch, Windows Powershell
Html
Python
C

Tools

Sql Server Enterprise Manager, Sql Query Analyzer, Ssms
Sql Server Integrated Services (Ssis), Sql Server Report Services (Ssrs)
Ms Visual Studio
Ms Power Apps
Toad, Pl/Sql-Developer, Oracle Sql Developer
Red Gate Sql (Data) Compare
Mysql Workbench
Confluence Wiki Software (Atlassian)
Sharepoint, Sharepoint Designer
Servicenow, Iet Itsm (Integrated Service Level Management)
Svn (Subversion), Tortoisesvn, Visualsvn Server
Rcs, Cvs, Wincvs
Control-M
Joomla (Cms)
Nextcloud
Taiga (Project Management)
Idoc (Sap)
Webmethods
Awk / Sed

Areas Of Work / Methods

Accounting / Electronic Invoices
Agile Software Development / Prototyping / Scrum
Application Development / Custom Software Development
Order Processing
Business Process Management
Controlling
Customer Relationship Management
Database Administration
Database Design / Data Modeling / Relational Databases
Devops / Continuous Delivery
E-Commerce (Couponing, Online Shops, Promotions, Online Quality Management)
E-Invoicing / Electronic Invoices (Xml, Xrechnung, Zugferd)
Full Stack Development
Business Process Optimization
Incident Management
Internet/Intranet Development
Design And Implementation
Mail Servers, Messaging
Marketing / Sales
Migration / Porting
Monitoring (Processes, Databases)
Project Leadership / Project Management / Project Controlling
Rollout
Interfaces / Interface
Supply Chain Management
Support
System Administration
Tuning
Workflow

Languages

German

Native

English

Advanced

Education

Munich University of Applied Sciences

Business Informatics · Munich, Germany

Statistics

Experience

Total positions 19

Experience in Information Technology 15 y

Avg length 2 y 9 m

Longest experience 9 y

Global experience

Countries worked in 1 (Germany)

Primary country Germany

Expertise

Recent roles Support/Development/Consulting – Process Development, E-Invoicing, XRechnung, ZUGFeRD, Design/Development/Consulting – Digital Print Products, Configuration and Calculation, Design/Development/Consulting – Calculation of Sales Prices

Main industries Information Technology, Construction, Professional Services

Main business areas Information Technology, Operations, Project Management

Profile

Member since

December 2023

Last update

October 2026

Need a freelancer? Find your match in seconds.

Try FRATCH GPT

Frequently asked questions

Have questions? Find more information here.

Ernst is based in Munich, Germany.

Ernst speaks the following languages: German (Native), English (Advanced).

Ernst has at least 21 years of experience. During this time, Ernst has worked in at least 17 different roles. The average length of individual experience is 1 year and 1 month. Note that Ernst may not have shared all experience and actually has more experience.

Based on recent experience, Ernst would be well-suited for roles such as: Support/Development/Consulting – Process Development, E-Invoicing, XRechnung, ZUGFeRD, Design/Development/Consulting – Digital Print Products, Configuration and Calculation, Design/Development/Consulting – Calculation of Sales Prices.

Ernst's most recent position is Support/Development/Consulting – Process Development, E-Invoicing, XRechnung, ZUGFeRD.

Ernst is most experienced in industries like Information Technology, Construction, and Professional Services. Ernst also has some experience in Retail, Food and Beverage, and Manufacturing.

Ernst is most experienced in business areas like Information Technology, Operations, and Project Management. Ernst also has some experience in Finance, Accounting, and Quality Assurance.

Ernst has recently worked in industries like Information Technology, Professional Services, and Manufacturing.

Ernst has recently worked in business areas like Information Technology, Operations, and Project Management.

Ernst attended Munich University of Applied Sciences for Business Informatics.

Ernst will be available full-time from December 2026.

Daily rate distribution

0% 25% 50% 75% 100%

<€800 €800-960 €960-1120 €1120-1280 €1440+

The rates shown represent the typical market range for freelancers in this position based on recent contracts on our platform.

Average rates for similar positions

Rates are based on recent contracts and do not include FRATCH margin.

1000

750

500

250

Daily rate avg. 940 €

The average daily rate is the mean of all daily rates from recent contracts of comparable freelancers on our platform.

1000

750

500

250

Median rate 940 €

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 17 Oct 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.

Similar freelancers

Discover other experts with similar qualifications and experience

Experts recently working on similar projects

Freelancers with hands-on experience in comparable project as a Support/Development/Consulting – Process Development, E-Invoicing, XRechnung, ZUGFeRD