Holger Klink - Sage 100 to Odoo Migration Specialist

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Merzalben, Germany

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Experience

Feb 2025 - Apr 2025

3 months

Data Migration Sage 100 to Odoo

LRT Automotive

SQL database development, design, documentation of procedures, functions, and triggers
Migration of data from the Sage Line 100 database to Odoo
DB design with MS SQL Server and SQL (T-SQL)
Use of Power Query and Excel

Jun 2024 - Feb 2025

9 months

Application Development and Database Development

Aktive-Time

Implementation of a general web API for various clients (WPF, ASP.Net Core app)
Design and documentation of database and application architecture
Technologies: C#.Net Core 8.0, SQL, Entity Core 9.0, LINQ, ASP.Net Core Web API (JSON), Docker, Serilog

Aug 2020 - Mar 2024

3 years 8 months

Munich, Germany

ASP.Net Application Development

IF Blueprint AG

ASP.Net application development and database development
Design and documentation of WebAPIs
Bug fixing in C#, WPF, and unit tests
Adjustments at ADO document level and VSTO add-ins
Development of Office add-ins for Excel, Word, and SLV
Technologies: C#, .Net Framework 4.8, VBA, Python, WPF, VSTO, Windows API, .Net Core, Excel-DNA, SQLite DB, Autofac, ClosedXML, Log4Net, COM Interop, Active-X, Custom Task Pane, WCF, XAML

Jul 2019 - Mar 2020

9 months

Unterschleißheim, Germany

Application Development

Alpine

Implementation of a 64-bit legacy wrapper
Implementation of EF Core (context manager, repository, SQLite DB)
Bug fixing with debugging and testing in C#, WPF
Implementation of an ASP.Net Core Web API for data exchange
Technologies: C#.Net, SQL, Entity Core 2.2/3.1, LINQ, ASP.Net Core Web API (JSON), SQLite

Oct 2018 - Mar 2019

6 months

Stuttgart, Germany

Visual Studio Application Development

MDC Stuttgart

Integration of .Net WinForms and WPF into the Sage 100 GUI (MS Access)
Project management, design, planning, and development
Technologies: C#, Entity Framework, LINQ, Access VBA, WPF, WinForms, SQL

Aug 2018 - May 2019

10 months

Stuttgart, Germany

Application Development

MDC Stuttgart

DRACOON cloud integration with Sage Line 100
Project management, design, planning, and development
Technologies: C#.Net, Sage Add-In (Access, VBA), SQL, Entity Framework 6.2, LINQ, ADO

Oct 2017 - Feb 2018

5 months

Stuttgart, Germany

Application Development

MDC Stuttgart

Revision and further development of the existing Sage Access Add-In
Project management, design, planning, and development
Technologies: Access, VBA, ADO, SQL, Word, Outlook

Jun 2017 - Oct 2017

5 months

Stuttgart, Germany

Application Development

MDC Stuttgart

Development of the Sage task center
Project management, design, planning, and development
Technologies: C#, Entity Framework 6.2, LINQ, ADO.Net, SQL

Mar 2017 - Apr 2017

2 months

Stuttgart, Germany

Application Development

MDC Stuttgart

Integration of Bonobo Git Server and DRACOON Cloud with JSON REST and version control
Use of Thomson Reuters RFA API and OpenDacs
Project management, design, planning, and development
Technologies: IIS, Git

Jan 2017 - Apr 2017

4 months

Stuttgart, Germany

Application Development

MDC Stuttgart

Creation of reports in SSMS (Reporting Services) and Excel
Project management, design, planning, and development
Technologies: VBA, SQL, ADO

Oct 2016 - Feb 2019

2 years 5 months

Schwaig, Germany

Application Development

1stVision

Retrieval of currency, foreign exchange, and precious metal rates via Reuters RFA API
Development of Windows services for time-based processing of export and import interfaces
Technologies: C#.Net, SQL, XML

Sep 2016 - Jan 2017

5 months

Stuttgart, Germany

Application Development

MDC Stuttgart

Revision of auditor assignment and server certificate management in Windows Domain (AD)
Creation of new documents in Word and programming of text modules
Project management, design, planning, and development
Technologies: MS-SQL Server, Sage Add-In (VBA), SQL

Sep 2016 - Oct 2016

2 months

Application Development

O & S EDV Weingarten

Updating legacy systems
Project management, design, planning, and development
Technologies: VB.Net, Sage Add-In (VBA), SQL

Sep 2016 - Sep 2016

1 month

Stuttgart, Germany

Application Development

MDC Stuttgart

Development of an interface for data transfer to DADIS
Project management, design, planning, and development
Technologies: Core FTP, Sage Add-In (VBA), SQL

Jul 2016 - Aug 2016

2 months

Application Development

O & S EDV Weingarten

Development of an interface from Sage Line (ERP, PPS) to Calitime (time tracking)
Project management, design, planning, and development
Technologies: VB.Net, Sage Add-In (VBA), SQL

Apr 2016 - Jun 2016

3 months

Application development

O & S EDV Weingarten

Adjustments and updates to legacy systems
Project management, concept, planning, and development
Technologies: VB.Net, Sage Add-In (VBA), SQL

Apr 2016 - Apr 2016

1 month

Application development

O & S EDV Weingarten

Update of legacy systems
Project management, concept, planning, and development
Technologies: VB.Net, Sage Add-In (VBA), SQL

Mar 2016 - Apr 2016

2 months

Application development

O & S EDV Weingarten

Development of SQL database triggers for table matching across different Sage databases
Project management, concept, planning, and development
Technologies: SQL

Jan 2015 - Sep 2015

9 months

Munich, Germany

Application development

Smeg Hausgeräte GmbH

Development of a logistics interface between Sage OfficeLine and Rhenus
Setup of a transfer database and a Windows service
Implementation of an SFTP interface and MSSQL Reporting Services
Technologies: VB.Net, Sage Add-In (VBA), SQL

Jul 2014 - Jul 2015

1 year 1 month

Dahn, Germany

Application development

SLS Kunststoffverarbeitungs GmbH & Co. KG

Pre-calculation with quote creation for AktiveTime production
Development of quantity-based quote creation based on a resource list
Technologies: Powerbuilder Application, VBA

Jun 2013 - Aug 2013

3 months

Munich, Germany

Application Development

Smeg Hausgeräte GmbH

Development of an inventory planning tool in Excel with document workflow
Project management, concept, planning, and development
Technologies: VBA, SQL

Oct 2012 - Nov 2012

2 months

Munich, Germany

Application Development

Smeg Hausgeräte GmbH

Expansion of the ServiceTool software with a dunning system for technicians
Project management, concept, planning, and development
Technologies: PowerBuilder .NET Win Form Application

May 2012 - Jul 2016

4 years 3 months

Dahn, Germany

Database Development

SLS Kunststoffverarbeitungs GmbH & Co. KG

Development and delivery of reports with MS SQL Reporting Services
Project management, concept, planning, and development
Technologies: SQL (T-SQL), stored procedures and functions

Mar 2012 - Dec 2012

10 months

Munich, Germany

Application Development

Smeg Hausgeräte GmbH

Development of a logistics interface from Sage OfficeLine to COGLAS GmbH Logistic Solutions
Project management, concept, planning, and development
Technologies: Sage Add-In (VBA Access), SQL

Jan 2012 - May 2012

5 months

Munich, Germany

Application Development

Smeg Hausgeräte GmbH

Development of a .NET WCF service to connect the service software and the web client
Project management, concept, planning, and development
Technologies: PowerBuilder .NET Winform application, VB.NET WCF service, Tapi interface

Jan 2010 - Jul 2010

7 months

Munich, Germany

Application Development

Smeg Hausgeräte GmbH

Development of a service center web client for field service employees
Functions for reports, customer lists, online orders, and bonus billing
Technologies: Powerbuilder .Net Web Form Application

Mar 2009 - Mar 2016

7 years 1 month

Munich, Germany

System Administrator

Smeg Hausgeräte GmbH

Administration of servers, networks, devices, and software
Support of Windows Server domains (DNS, DHCP, AD), SQL Server, Exchange Server, ESXi Server
Use of Symantec Backup Exec, time tracking systems, and phone systems

Sep 2004 - Oct 2005

1 year 2 months

Dortmund, Germany

Application Development

Hadley Profiltechnik GmbH

Adjustments to the AktiveTime production system for coils in roll production
Project management, concept, planning, and development
Technologies: Powerbuilder Application, Sage Add-In (VBA), VBA

Mar 2003 - May 2006

3 years 3 months

Application Development

Aktive-Time Software

Development of a PPS production management system as an add-in for Sage OfficeLine
Project management, concept, planning, and development
Technologies: Powerbuilder Application, Sage Add-In (VBA), VBA

Industry experience

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

Experienced in Information Technology, Manufacturing, Banking and Finance, and Automotive.

Information Technology

Manufacturing

Banking and Finance

Automotive

Business area experience

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

Experienced in Information Technology, Project Management, Product Development, Business Intelligence, Logistics, and Supply Chain Management.

Information Technology

Project Management

Product Development

Business Intelligence

Logistics

Supply Chain Management

Summary

Creative professional with extensive project experience. My strengths include analytical thinking, creativity, perfectionism, passion, patience, and teamwork.

As a self-employed database and software developer, I have designed and developed projects for medium-sized industrial companies, banks, public authorities, and automotive suppliers over the past years. My main focus areas are ERP systems (Sage 100), PPS, PowerBuilder applications, interfaces, and also custom solutions for public authorities.

Besides project work, I am also open to new things and can easily imagine bringing my experience into temporary agency work or a permanent position.

Skills

Project Management And Consulting
Migration Of Legacy Systems
Digitalization Of Public Authorities And Offices
Analysis, Planning, Programming, Implementation, Documentation, And Training

Programming And Development

Back-End And Front-End Programming In C#/Vb.Net (Framework, Core), Vba (Winforms, Wpf, Wcf, Soap, Json/Rest, Asp.Net Web Services, Services, Interfaces)
Database Programming (Ms Sql Server, Sqlite, Transact-Sql)
Application Development Erp, Especially Sage Line 100 (Officeline) In C#, Powerbuilder, Vb.Net, And Access (Vba)
Customizations For Sage Line 100 (Documents, Dcm, Add-Ins, App Designer, Task Center)
Interface Programming For Logistics, Pps, Bde, Time Tracking, Cloud Integration
Ms Office Programming (Vba, Vsto, Com Interop)

Programming Focus

C#
Vb.Net
Vba
Sql
Ms Office
Powerbuilder

Databases

Ms Sql Server (Ssms, T-Sql, Procedures, Functions, Triggers, Db Design, Reporting Server)
Sqlite
Sybase Ase

Frameworks And Technologies

Entity Framework / Core
Asp.Net Webapi
Linq
Ado / Ado.Net
Winforms
Wpf
Wcf

Data Formats

Xml
Json
Xaml

Tools

Visual Studio
Git
Docker
Jira
Vs Code

Special Knowledge

Thomson Reuters Api Rfa (Robust Foundation Api), Opendacs
Dracoon Cloud (Json Rest, Swagger-Codegen)
Sage Task Center (Logisoft)

Administration

Exchange
Windows Domain (Ad), Networks
Windows Server
Ms Sql Server
Vmware Esxi
Hyper-V
Linux Server
Iis
Core Ftp

Ms Office

Word
Excel
Access
Powerpoint

Languages

German

Native

English

Intermediate

Education

Sep 2000 - Jul 2002

Vocational School Donaueschingen

Secondary school certificate · Secondary school certificate · Donaueschingen, Germany

Sep 2000 - Jul 2002

EDV-Beratung Weiss Schiltach

IT specialist application development · IT specialist for application development · Schiltach, Germany

Statistics

Experience

Total positions 29

Experience in Information Technology 10.5 y

Avg length 1 y

Longest experience 7 y

Global experience

Countries worked in 1 (Germany)

Primary country Germany

Expertise

Recent roles Data Migration Sage 100 to Odoo, Application Development and Database Development, ASP.Net Application Development

Main industries Information Technology, Manufacturing, Banking and Finance

Main business areas Information Technology, Project Management, Product Development

Qualifications

Profile

Member since

August 2025

Last update

August 2026

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Frequently asked questions

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Holger is based in Merzalben, Germany and can operate in on-site, hybrid, and remote work models.

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

Holger has at least 18 years of experience. During this time, Holger has worked in at least 8 different roles and for 11 different companies. The average length of individual experience is 1 year and 8 months. Note that Holger may not have shared all experience and actually has more experience.

Based on recent experience, Holger would be well-suited for roles such as: Data Migration Sage 100 to Odoo, Application Development and Database Development, ASP.Net Application Development.

Holger's most recent position is Data Migration Sage 100 to Odoo at LRT Automotive.

In recent years, Holger has worked for LRT Automotive, Aktive-Time, and IF Blueprint AG.

Holger is most experienced in industries like Information Technology, Manufacturing, and Banking and Finance. Holger also has some experience in Automotive, Agriculture, and Chemical.

Holger is most experienced in business areas like Information Technology, Project Management, and Product Development. Holger also has some experience in Business Intelligence, Logistics, and Supply Chain Management.

Holger has recently worked in industries like Information Technology and Automotive.

Holger has recently worked in business areas like Information Technology and Product Development.

Holger attended Vocational School Donaueschingen for Secondary school certificate.

The availability of Holger needs to be confirmed.

Daily rate distribution

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<€640 €640-800 €800-960 €960-1120 €1120+

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

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Daily rate avg. 800 €

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

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Median rate 760 €

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.