Holger Grittner
IT
Experience
IT
Holger Grittner Consulting
Managing Director and Partner
Polygon GmbH
IT
Freelancer and Lecturer
IT
Frank Neul und Holger Grittner GbR
Apprenticeship as Central Heating and Ventilation Technician
School education, intermediate school leaving certificate
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 Education (26 years), Professional Services (25 years), Information Technology (17 years), and Construction (4 years).
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 (34 years), Operations (13 years), and Strategy (9 years).
Summary
My focus is on application development with VBA (macros) for Microsoft Access, Microsoft Excel and Microsoft Word. This includes process analysis, creating data models, designing the GUI, ribbon-based user guidance, as well as producing meaningful data outputs (lists, pivots and charts).
Microsoft Teams is also increasingly used as a collaboration tool, using many of its features: calling/video, calendar, Planner (Kanban), To Do, Lists, Forms, Whiteboard, Visio, topic-specific channels, etc.
Consulting and development according to IT baseline protection (BSI Standard) and ISO/IEC 27001, government experience (information security management) and General Data Protection Regulation (GDPR).
Skills
Areas Of Expertise
- Software Development
- Process Analysis And Data Modeling
- Network And Desktop Administration
- Remote And On-site Support
- Training
- Sales Of Hardware (Wortmann Ag), Components, Software And Accessories
Industries
- Law Firms
- Medical Practices
- Government Agencies
- Service Providers
- Retail
- Manufacturing
- Logistics
- Media
- Associations
Operating Systems
- Windows 98 To Windows 11
- Windows Server From Nt4.0 To Windows Server 2019
Programming & Scripting Languages
- Vba
- Batch Scripting
Databases
- Microsoft Access
- Microsoft Sql Server
- Mysql
- Sql/400
- Postgresql
Applications
- Microsoft Office Products/applications (Word, Excel, Powerpoint, Outlook), All Versions (Microsoft 365, Office, Published App (Citrix))
- Microsoft Sharepoint
- Various Tools
Collaboration & Tools
- Microsoft Teams (Calling/video, Calendar, Planner (Kanban), To Do, Lists, Forms, Whiteboard, Visio, Topic-specific Channels)
- Active In Topic-specific User Forums (E.g. On Xing)
It Security & Standards
- Consulting And Development According To It Baseline Protection (Bsi Standard)
- Iso/iec 27001
- Government Experience In Information Security Management
- General Data Protection Regulation (Gdpr)
- Protection Requirements Assessment According To Bsi Standard 200-2 Of The It Baseline Protection
Vba & Office Development
- Macro Automation
- Event-driven Programming
- Userform Design
- Ribbon Customization
- Error Handling
- Data Manipulation
- Dynamic Arrays
- Ado (Activex Data Objects)
- Data Access Objects (Dao)
- Adodb (Microsoft Activex Data Objects Database)
- Com Add-ins
- Api Integration
- Custom Functions
- Excel Object Model
- Access Object Model
- Word Object Model
- Database Connectivity
- Data Import/export
- Pivottable Automation
- Chart Automation
- Report Generation
- Template Management
- Document Automation
- Cross-application Scripting
- Performance Optimization
- Code Refactoring
- Debugging Techniques
- Version Control With Vba
- Semantic Versioning
- Reddick Naming Convention / General Coding Conventions
Buzzwords
- User Experience (Ux)
- Usability & User Experience (Uux) Design
- Agile Methodologies
- Devops
- Continuous Integration/continuous Deployment
- Stakeholder Management
- Risk Management
- Change Management
- Project Scheduling
- Government Experience
- Hands-on Mentality
Languages
Education
Apprenticeship as Central Heating and Ventilation Technician · Central Heating and Ventilation Technician · Germany
Secondary School Certificate · School Education · Germany
Profile
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