Profile & project experience

Microsoft Power Platform expert Reiner Keller

I am a Microsoft Power Platform expert, Microsoft 365 consultant, and Microsoft Certified Power Platform Solution Architect Expert - with more than 30 years of professional experience in information technology. Since 2022, I have run my own company, powerbunch GmbH.

  • Euskirchen near Cologne and Bonn, Germany
  • since 10/1994 in IT
  • German and English
Reiner Keller, Microsoft Power Platform expert and Managing Director of powerbunch GmbH
Reiner KellerManaging Director · powerbunch GmbH

01Introduction

Complex technology. Implemented clearly.

As a Microsoft Power Platform expert and Microsoft 365 consultant with more than 30 years of professional experience in information technology, I take a comprehensive approach to designing and implementing business solutions. My in-depth IT knowledge, especially around the Microsoft Power Platform, makes me a reliable partner for companies looking for smart solutions for digitalization and process automation.

It is important to me to make complex technologies understandable while developing custom solutions that fit my clients' requirements exactly. With my broad experience and ongoing professional development in a changing IT landscape, I help companies realize the full potential of the Microsoft Power Platform and achieve their business goals.

I analyze requirements, provide consulting, and implement digitalization and automation solutions. My particular focus is on Microsoft Power Automate (cloud flows) and Microsoft Power Apps (canvas apps) in combination with Microsoft SharePoint and Lists, Dataverse, and integrations with other systems.

Since October 1, 2022, I have been self-employed with my own company, powerbunch. As the sole shareholder and managing director of powerbunch GmbH, I am personally your point of contact for every project. For many years, I also supported companies, teams, and business units as a trainer - today I focus entirely on consulting and project implementation. I share knowledge where it makes a difference: during the project, at handover, and in the documentation.

30+Years

Professional experience in IT

12

Microsoft certifications

28

documented projects

since

2018

Focus on Microsoft 365 and the Power Platform

02Skills

What I bring to the table.

Core competencies

  • Business process automation
  • AI integration (ChatGPT, Claude)
  • Microsoft Power Platform adoption
  • Microsoft Power Apps
  • Microsoft Power Automate
  • Microsoft SharePoint and Microsoft Lists
  • Microsoft 365 and Office 365
  • Robotic process automation (RPA)
  • Business process automation (BPA)
  • Application programming interface (API)

Professional skills

Analysis, development, enhancement, and optimization of IT structures and processes - through consulting, support, and implementation.

Strengths

  • innovative
  • constructive
  • analytical
  • structured

Qualities

  • creative
  • agile
  • communicative
  • persistent

Microsoft technologies and integrations from client projects

  • Microsoft Power Apps (canvas apps and model-driven apps)
  • Microsoft Power Automate (cloud flows and desktop flows)
  • Microsoft Dataverse
  • Microsoft SharePoint and Microsoft Lists
  • Microsoft Teams
  • Microsoft Outlook
  • Microsoft Planner
  • Microsoft Forms and Dynamics 365 Customer Voice
  • Microsoft Word, Excel, and PowerPoint
  • Microsoft AI Builder
  • Microsoft Power BI
  • Microsoft Graph API
  • Microsoft Power BI API
  • Microsoft Dynamics 365 Business Central (integrations)
  • sevDesk API
  • Lexware API
  • Adobe Acrobat Sign API
  • Philips Hue API

03Certifications

Proven knowledge, from the fundamentals to architecture.

Expert

  • PL-600Power Platform Solution Architect Expert

Associate

  • PL-500Power Automate RPA Developer Associate
  • PL-400Power Platform Developer Associate
  • PL-200Power Platform Functional Consultant Associate
  • PL-100Power Platform App Maker Associate
  • DP-203Azure Data Engineer Associate

Fundamentals

  • PL-900Power Platform Fundamentals
  • AI-900Azure AI Fundamentals
  • DP-900Azure Data Fundamentals
  • MS-900Microsoft 365 Fundamentals
  • AZ-900Azure Fundamentals
  • SC-900Security, Compliance, and Identity Fundamentals

Other

  • MCTInstructional skills for the Microsoft Certified Trainer (MCT) Program - Certificate of completion
  • T3Fourth Dimension Technologies Train the Trainer Program

View all certifications on Microsoft Learn (opens in a new tab)

04Client projects

My project experience, most recent first.

All projects anonymized - without client names. With filters and case studies on the case studies page.

06/2026 - 09/2026Implementation

Industry

Part of a group of companies with more than 12,000 employees · internationally active company within a group of companies

For a manufacturing company, I implemented a multi-stage approval process for customer orders with Power Automate and SharePoint. Engineering, installation, order management, purchasing, and a second purchasing review handle approvals in sequence; rejections are routed back to the appropriate step with a required explanation. Nine flows, eight SharePoint lists, escalation, and an audit trail form the core system.

  • Power Automate (cloud flows)
  • Power Automate Approvals
  • SharePoint Online (lists)
  • Office 365 Outlook
  • Power Platform solutions (managed and unmanaged)
  • HTTP triggers and JSON-based integrations between flows
  • HTML email templates
Read case study: Order approval in manufacturing with Power Automate and SharePoint

12/2025 - 09/2026Implementation

Energy and cable industry

more than 10,000 employees · international, QHSE application in scope for several thousand users in many countries

For an international group in the energy and cable industry, I supported the migration of SharePoint and Power Platform applications. I developed the security and Azure architecture concept for a QHSE application and rebuilt three Power Apps for hazardous substance management, replacing an on-premises SharePoint solution with Nintex workflows.

  • Power Automate (cloud flows)
  • Power Apps (canvas apps)
  • SharePoint Online
  • On-premises SharePoint (source system)
  • SharePoint REST API
  • Entra ID (app roles, B2B, External ID, Conditional Access)
  • Azure (App Service, Azure SQL, Blob Storage, Key Vault, private endpoints)
  • Office 365 Users and Office 365 Outlook
  • Power Fx (ParseJSON)
  • HTML/CSS
  • Nintex Workflow (analysis of the legacy system)
Read case study: SharePoint migration, Power Apps, and Azure in the cable industry

since 11/2025Implementation

Metalworking - precision turned and milled parts

more than 100 employees · supplier with customers in Germany and abroad, production in shifts

For a manufacturer of precision turned and milled parts, I designed and implemented a responsive canvas app for quality inspections in production. It determines which inspection characteristics are due for each machine, part, and inspection trigger, evaluates measured values against tolerances, and stores the results in an auditable form in SharePoint, with versioning and restricted editing rights. In addition, I advise on migrating an existing production app that has evolved over time into separate environments.

  • Power Automate (cloud flows)
  • Power Apps (canvas app, responsive design)
  • SharePoint Online
  • Azure SQL
  • Entra ID and Microsoft 365 groups
  • Power Platform solutions (ALM)
  • Office 365 Outlook
  • Dataverse
  • Dynamics 365 Business Central
  • JSON
  • Q-DAS DFQ (analysis)
Read case study: Digital quality inspection with Power Apps in precision machining

08/2024 - 06/2025Knowledge transfer

Automotive industry

more than 190,000 employees · international

For an international automotive group, I created English-language learning paths, Q&A formats, and a 122-page handbook on developing Power Apps, working through a partner. This was later followed by guides that enabled employees to migrate their apps, flows, and SharePoint forms to a new Microsoft 365 tenant themselves.

  • Power Automate (cloud flows, desktop flows)
  • Power Apps (canvas app)
  • SharePoint Online (lists, forms with Power Apps)
  • Teams
  • Power BI
  • Power Platform environments
  • Excel
Read case study: Power Platform learning paths, handbook, and migration guides, automotive

01/2024 - 02/2024Knowledge transfer

Technologies for industry, infrastructure, and mobility

Group with more than 300,000 employees, site with more than 1,400 · international group

Through a training academy, I delivered an online Power Platform training course for an international technology group. In five sessions, 17 employees learned the fundamentals and implemented a use case with SharePoint, Power Automate, and Power Apps.

  • Power Automate (cloud flows, desktop flows, approvals)
  • Power Apps (canvas app)
  • SharePoint Online
  • Dataverse
  • Forms
  • Teams

11/2023Knowledge transfer

Lubricant manufacturing

more than 5,000 employees · international sales

Through a training academy, I delivered a four-day online Power Platform training course for an internationally active lubricant manufacturer. The participants implemented a use case for managing customer data with SharePoint, Power Automate, and Power Apps, including the approval workflow.

  • Power Automate (cloud flows, desktop flows, approvals)
  • Power Apps (canvas app)
  • SharePoint Online
  • Dataverse
  • Forms
  • Teams
  • Word (templates)
  • Power Platform adoption framework

09/2023 - 10/2023Consulting

Waste disposal, dumpster services, and separator maintenance

small or medium-sized enterprise (SME) · regional

For a waste disposal company, I identified on site where processes could be digitized and automated with Microsoft 365. In addition, I advised on the application for a voucher from a funding program for innovation and digitalization in small and medium-sized businesses.

  • 365
  • Power Platform

07/2023Consulting

Facade construction (metal)

around 300 employees, group of companies with around 500 employees · internationally active group with several production sites

A mid-sized facade builder manages production and shipping with several canvas apps on tablets, using SharePoint lists as the data foundation. I analyzed the apps and formulas and developed recommendations on performance, data integrity, usability, and the unambiguous mapping of ERP data.

  • Power Automate
  • Power Apps (canvas apps)
  • SharePoint Online (lists)
  • Power BI

06/2023 - 12/2023Knowledge transfer

Microsoft 365 consulting and software development provider

more than 10 employees

For a consulting firm specializing in Microsoft 365, I delivered a four-day online Power Platform training course. In a specially prepared training tenant, 17 employees implemented an end-to-end use case, from data entry to the approval workflow.

  • SharePoint Online
  • Dataverse
  • Power Automate (cloud flows, desktop flows, approvals)
  • Power Apps (canvas app)
  • Forms
  • Teams
  • Word (templates)
  • Power Platform adoption framework

06/2023 - 12/2023Consulting

Manufacturer of shading systems

more than 5,000 employees · international sales

For a manufacturer of shading systems, I supported the rollout of the Power Platform. I developed an environment strategy with sandbox and production environments, gathered the first use cases from the business units, and equipped business users to implement a use case of their own.

  • Power Platform admin center (environments, security roles)
  • Entra ID (security groups)
  • SharePoint Online (lists)
  • Power Automate (cloud flows, approvals)
  • Power Apps (canvas apps)
  • Forms
  • Teams

02/2023 - 03/2023Consulting

Food manufacturing

more than 100 employees

For a food manufacturer, I provided consulting on Microsoft 365. The focus was on the possibilities SharePoint, Power Automate, and Power Apps offer for digitizing and automating processes.

  • SharePoint Online
  • Power Automate
  • Power Apps

12/2022 - 03/2023Consulting

Manufacturing and development of gears and drive components

more than 70 employees

For a manufacturer of gears and drive components, I provided consulting on Microsoft 365 and the Power Platform. The session focused on a digital inventory management system for vehicles, operating equipment, tools, measuring equipment, and lifting devices.

  • SharePoint Online
  • Power Automate
  • Power Apps
  • Teams

12/2022 - 05/2023Consulting

Environmental analyses and indoor climate products for residential and commercial customers

small company · sales through its own online stores and online marketplaces

For a company that sells environmental analyses and indoor climate products via online marketplaces, among other channels, I analyzed manual processes. The analysis focused on importing monthly marketplace sales into the inventory management system as inventory deductions.

  • Power Automate
  • SharePoint Online
  • Excel
  • CSV/TXT reports
  • Import interface of an inventory management system

12/2022 - 01/2023Consulting

Electrical engineering, electronics, and automation

more than 20,000 employees · international sales

For an internationally active electrical engineering group, I provided Power Platform consulting in two blocks of hours. The topics were SharePoint, Power Automate, and Power Apps, as well as technical support with specific questions.

  • SharePoint Online
  • Power Automate
  • Power Apps

12/2022 - 08/2024, then support as neededImplementation

Social work and care (nonprofit welfare)

more than 2,000 employees · more than 80 services and facilities

For a nonprofit welfare organization, I rebuilt the approval process for quality management documents with SharePoint and 25 Power Automate flows. In addition, I built a canvas app for business travel requests and travel expense reports.

  • SharePoint Online (document libraries, lists, content approval, managed metadata)
  • Power Automate (cloud flows, approvals)
  • Power Apps (canvas app)
  • Word (document templates with content controls)
  • Word Online (Business) and OneDrive for Business
  • SharePoint REST API
  • Office 365 Users and Microsoft Entra ID
  • Office 365 Outlook
  • Power Platform solutions with connection references
Read case study: Quality management approval and a business travel app with SharePoint and the Power Platform

since 04/2022Implementation

Automotive supplier

more than 3,000 employees · international sales at more than 20 locations

For an automotive supplier, I digitized internal request processes with the Microsoft Power Platform. A canvas app for purchase requests to procurement has been in use company-wide since 2023; a second app covers seminar requests from application to feedback. Around 100 cloud flows control approvals, reminders, Planner tasks, and the automatic synchronization of HR data.

  • Power Automate (cloud flows, approvals)
  • Power Apps (canvas apps)
  • SharePoint Online / Microsoft Lists
  • Planner
  • Graph API
  • Entra ID (security and Microsoft 365 groups)
  • Office 365 Outlook and Office 365 Users
  • Excel Online (Business) and Office Scripts
  • Visio (process documentation)
Read case study: Procurement and employee training with Power Apps at an automotive supplier

04/2022 - 04/2023Consulting

Energy supplier

more than 7,500 employees · more than 40 locations, international sales

For an energy supplier, I supported the rollout of electronic signatures with Adobe Acrobat Sign. I developed a bilingual training plan, quick-start guides, videos, and recommendations, delivered training sessions tailored to specific audiences, held office hours via Teams, and supported users with questions and form migrations.

  • Adobe Acrobat Sign (incl. web forms, library templates, bulk send)
  • Adobe Acrobat Sign Office add-ins
  • Teams
  • Forms
  • TechSmith Camtasia
  • PowerPoint
Read case study: E-signature rollout with Adobe Acrobat Sign at an energy supplier

04/2022Knowledge transfer

Manufacturer of synthetic resin systems

more than 500 employees · locations in more than 30 countries

Consulting, training, and technical support for migrating analog and digital process workflows (e.g., requests for IT user accounts, software, and hardware, material deliveries, and reservations) to Microsoft Power Automate.

  • Power Automate

since 02/2022Implementation

Specialist retailer of fireplaces and stoves with delivery and installation

more than 50 employees · group of companies with several companies and locations in Germany

For almost five years, I developed the central order processing system for a fireplace and stove retailer with several companies and locations, based on SharePoint, Power Automate, and Power Apps, and I still support it today. Quotes with digital signatures, invoices and payment reminders via sevDesk, Planner tasks, customer surveys with Forms, Power BI, and a mobile installation report on tablets all work together. The solution gave rise to the industry platform FLAMOX365.

Solution in daily use with more than 50 app users at several locations

  • SharePoint Online (lists and libraries)
  • Power Automate (cloud flows)
  • Power Automate approvals
  • Power Apps (canvas apps)
  • Forms (customer surveys)
  • Power BI
  • Planner
  • Teams
  • Outlook / Office 365
  • Entra ID (Azure AD)
  • Excel Online
  • Encodian (Word templates and PDF)
  • Adobe Acrobat Sign
  • sevDesk REST API
  • SOAP API (industry CRM)
  • REST API (inventory management)
  • Word (templates)
  • Mobile device management for tablets
Read case study: Order processing for a stove retailer with Power Apps and SharePoint

01/2022 - 12/2023Consulting

IT service provider for digital transformation

more than 2,200 employees · more than 5 locations in Germany

In an IT service provider's collaboration solutions practice, I supported client projects with Microsoft 365 and the Power Platform and shared knowledge with consultants, including a multi-day Power Platform onboarding program and a session on the Microsoft Graph API.

  • 365
  • SharePoint Online
  • Power Automate
  • Power Apps
  • Graph API
  • Dataverse

01/2022 - 12/2023Knowledge transfer

International airport operations

more than 2,000 employees · more than 100 locations in more than 30 countries

For an international airport operator, I delivered workshops and held office hours in German and English on Microsoft 365, SharePoint, Power Automate, and Power Apps, working through an IT service provider.

  • 365
  • SharePoint Online (libraries, lists)
  • Power Automate (cloud flows)
  • Power Apps

01/2022 - 02/2022Consulting

Chemical industry

more than 1,000 employees · more than 100 locations in more than 20 countries

Consulting and support in developing a strategy to migrate data and applications from a legacy system to Microsoft 365, Microsoft SharePoint, and the Microsoft Power Platform, as well as training on the licensing and components of the Microsoft Power Platform.

  • 365
  • SharePoint Online
  • Dataverse / Dataverse for Teams
  • Power Automate
  • Power Apps
  • Power Virtual Agents
  • Power Pages (portals)

01/2022 - 02/2022Consulting

Packaging industry

more than 20 employees

Consulting and technical support in the areas of Microsoft 365, Microsoft SharePoint, and the Microsoft Power Platform, especially Microsoft Power Apps.

  • 365
  • SharePoint Online
  • Power Apps

11/2021 - 12/2021Implementation

Shading systems

more than 300 employees · international sales

Rollout of Microsoft Power Automate as the central automation platform and automation of invoice processing with Microsoft Power Automate (cloud and desktop flows), Microsoft AI Builder, and Microsoft Dynamics 365 Business Central. In addition, real-time visualization of presence status via the Microsoft Graph API in SharePoint and Microsoft Power BI, as well as training on Dataverse and canvas apps.

  • Power Automate (cloud flows, desktop flows)
  • AI Builder
  • Dynamics 365 Business Central
  • Graph API
  • Power BI (streaming dataset, REST API)
  • SharePoint Online
  • Dataverse

08/2021 - 10/2022Implementation

Manufacturer of bathroom faucets

more than 50 employees · international sales

For a manufacturer of bathroom faucets, I set up SharePoint as the central repository for product and lifestyle images and connected it to the website with Power Automate. 18 flows read image properties, transfer files via FTP to several web servers, generate JSON import files, and control image editing via Planner tasks.

  • Power Automate (cloud flows)
  • SharePoint Online (picture libraries, document libraries, and lists)
  • Planner
  • Teams
  • Office 365 Outlook
  • Excel Online (Business)
  • FTP connector
  • Cloudmersive Convert API (image analysis)
  • HTTP triggers between flows
  • JSON
Read case study: Power Automate and SharePoint: image data pipeline for bathroom faucets

01/2021 - 04/2021Implementation

Financial services

more than 20 employees

Consulting, design, and technical implementation of landing pages with form data connected to the Microsoft Power Platform, as well as automation of pre-contract, contract, and signature processes with Microsoft Power Automate and Adobe Sign.

  • Power Automate
  • Adobe Sign
  • WordPress

04/2019Knowledge transfer

Manufacturer of compression products

more than 200 employees · worldwide sales

Training in Germany and Switzerland on Microsoft 365, Windows, and the Office applications, as well as an introduction to Microsoft Power Automate and Microsoft Power Apps.

  • 365
  • Teams
  • SharePoint
  • OneDrive for Business
  • Planner
  • Power Automate
  • Power Apps
  • Forms

01/2019 - 03/2022Implementation

Distribution of ultra-fresh food

more than 4,500 employees · more than 2,500 locations in 7 countries

Building a central data foundation on Microsoft Dataverse and Dynamics 365, developing model-driven and canvas apps for location and quality management, and automating processes that affect revenue, such as multilingual online ordering and a delivery service, with Microsoft Power Automate, Web API, and Graph API. In addition, customer feedback with Customer Voice and Power BI, as well as training.

more than 200 automated flows - partially automated maintenance of data for more than 1,000 locations

  • Dataverse
  • Dynamics 365
  • Power Automate (cloud flows, desktop flows)
  • Power Apps (model-driven, canvas)
  • Web API
  • Graph API
  • Power BI
  • Customer Voice / Forms
  • SharePoint Online
  1. 10/1994Start of my career in information technology
  2. 02/2018Focus on Microsoft 365 and the Microsoft Power Platform
  3. 10/2022Founding of powerbunch GmbH - sole shareholder and managing director ever since

06Beyond consulting

Entrepreneurial and with AI.

My focus remains the Power Platform and business process automation. Two ventures alongside consulting and an established partnership show how I bring processes, products, data, and AI together.

Co-founder and managing director · since 2025

FLAMOX365 - the platform for the fireplace and stove industry

Together with two co-founders, I founded FLAMOX365 GmbH. The software connects manufacturers, stove installers, and their end customers in one end-to-end process - from consultation through quote, order, and installation to the invoice. It grew out of almost five years of hands-on experience at a stove installation company.

My role focuses on processes: I bring real-world workflows into the platform, am responsible for the product catalog with more than 10,000 products, and manage work on data protection and contract documents, the website, and explainer videos - largely with AI support. My co-founders develop the software itself.

  • Process design
  • Functional specification
  • Product data
  • Compliance management
  • AI-supported implementation

Private project · 2026

21 learning games in one month - developed with AI

Originally created for my daughter with an AI assistant, this collection includes 21 browser-based learning and movement games for preschool children: counting, arithmetic, reading, listening, telling time, money, and English - no registration, no ads, and available on computers, tablets, and smartphones.

I defined the requirements, made the instructional and design decisions, and tested every version on real devices. The AI wrote the code according to my specifications, tested it automatically, and published it via GitHub and Vercel.

  • AI-supported development
  • Requirements management
  • Automated publishing
  • Acceptance and testing

Partnership · for about two years

Power BI together with AMBLIX

For Power BI, I work with Andre Bauer of AMBLIX GmbH from Mettmann, Germany. He brings data strategy, data modeling, and visualization, and I bring the processes, flows, and apps that deliver the data - resulting in analyses whose numbers are right.

  • Power BI
  • Data modeling
  • Dashboards
  • Data integration

07Personal

At a glance

Place of residence
Euskirchen, Germany
Year of birth
1975
Professional experience since
10/1994
Languages
German and English
Business
powerbunch GmbH, Managing Director

My profiles on professional networks

LinkedIn (opens in a new tab)XING (opens in a new tab)

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