Markus Demmler - Senior Developer, Coach: Retail

Q: Where is Markus based?

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

Q: What languages does Markus speak?

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

Q: How many years of experience does Markus have?

Markus has at least 19 years of experience. During this time, Markus has worked in at least 14 different roles . The average length of individual experience is 1 year and 1 month . Note that Markus may not have shared all experience and actually has more experience.

Q: What is Markus's latest experience?

Markus's most recent position is Senior Developer, Coach: Retail .

Q: Which industries is Markus most experienced in?

Markus is most experienced in industries like Information Technology , Healthcare , and Retail . Markus also has some experience in Transportation , Banking and Finance , and Manufacturing .

Q: Which business areas is Markus most experienced in?

Markus is most experienced in business areas like Information Technology , Product Development , and Sales . Markus also has some experience in Business Intelligence .

Q: Which industries has Markus worked in recently?

Markus has recently worked in industries like Retail , Transportation , and Information Technology .

Q: Which business areas has Markus worked in recently?

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

Q: What is Markus's education?

Markus holds a Master in Computer Science .

Recommended expert

Augsburg, Germany

Check rate

Experience

Sep 2022 - Present

3 years 9 months

Senior Developer, Coach: Retail

Developed an app for store management
Technologies: C#/XAML, Xamarin.Forms, MvvmCross, NUnit, Xamarin.UITest, Entity Framework Core, ASP.NET Core Web API, Azure DevOps, Visual Studio App Center

May 2022 - Aug 2022

4 months

Senior Developer, Coach: Logistics

Built a new app framework for unified app development in the logistics domain
Technologies: C#, .NET MAUI, Reactive, SkiaSharp, moq, XUnit, Xamarin UI Test, Confluence, Jira, Bitbucket, Jenkins

Jan 2022 - Apr 2022

4 months

Senior Developer, Coach: Logistics

Built a web application for log file analysis and data replay
Technologies: C#, Blazor, MudBlazor, Reactive, ASP.NET Web API, moq, XUnit, Confluence, Jira, Bitbucket, Jenkins

Feb 2020 - Dec 2021

1 year 11 months

Senior Developer, Coach: Logistics

Modernized the driver workstation for a logistics market leader by developing a modern Android app and integrating it into existing business processes using web services
Technologies: C#/XAML, Xamarin.Forms, Xamarin.Android, Xamarin.Forms Shell, Jenkins, Jira, Bitbucket, Swagger, Scrum

Sep 2019 - Jan 2020

5 months

Lead Developer: Public Transport

Built a new ticketing app for Android and iOS
Technologies: C#, Xamarin.iOS, Xamarin.Android, SVN, Jira, Location Services, Activity Recognition, Background Services

Nov 2018 - Jul 2019

9 months

Senior Developer, Coach: Logistics

Modernization of the driver workstation of a market leader in logistics by redeveloping a modern Android app and integrating it into existing business processes using web services
Technologies: C#/XAML, Xamarin.Forms, Xamarin.Android, MvvmCross, Jenkins, Jira, Bitbucket, Swagger, Scrum

Jul 2018 - Oct 2018

4 months

Senior Developer, Coach: IT Document Management

Development of a new WPF app and related Office add-ins to securely manage, edit, and share documents
Technologies: C#/XAML, WPF, MVVM, MahApps.Metro, Zeplin, moq, Visual Studio 2017, Team Foundation Server 2017, Scrum

Apr 2017 - Jun 2017

3 months

Lead Developer: Industry

Development of an app for service technicians to manage all production-related resources and carry out maintenance tasks
Technologies: C#/XAML, Xamarin.Forms, MvvmCross, Visual Studio 2017, Team Foundation Server 2017, Scrum, App Center

Jan 2017 - Dec 2018

2 years

Consultant: Microsoft

Provided technical presales support to Microsoft as a P-TSP (Partner Technology Solution Professional) focusing on Xamarin, mobile development, and mobile DevOps tools (Visual Studio App Center)

Jul 2015 - Jul 2017

2 years 1 month

Lead Developer: Banknote Processing

Development of a cross-platform framework (Windows UWP+WPF, iOS, Android) for banknote processing applications
Technologies: C#/XAML, WPF, Xamarin.Forms, MvvmCross, Universal Windows Platform, Visual Studio 2017, Team Foundation Server 2015, Scrum

Mar 2015 - May 2015

3 months

Lead Developer: IT-Consulting

Requirements analysis, design and implementation of a mobile application for consolidated access to processing tasks
Technologies: C#, HTML5, CSS3, JavaScript, AngularJS, Apache Cordova, Ionic, Bootstrap, ASP.NET WebAPI, Visual Studio 2015, Azure Mobile Apps, Team Foundation Server 2013, iOS, Android, Balsamiq Mockups

Jan 2015 - Mar 2015

3 months

Lead Developer: Healthcare

Development of a mobile application for iPad and Android tablets to provide secure access to key performance indicators (KPIs), including financial and personnel data for management and controlling
Technologies: C#/XAML, Xamarin.Forms, MVVM, Syncfusion Essential Studio Xamarin, ASP.NET WebAPI, Visual Studio 2013, Team Foundation Server 2012, iOS, Android

Dec 2013 - Dec 2016

3 years 1 month

Senior Developer: IT Document Management

Development of a responsive web application for secure management, editing, and sharing of documents
Technologies: ASP.NET MVC 5, ASP.NET Web API 2, JavaScript, HTML5, CSS3, Knockout.js, Bootstrap, QUnit, Visual Studio 2013, Team Foundation Server 2013, Git, Scrum

Jan 2013 - Jun 2015

2 years 6 months

Lead Developer: IT-Consulting

Development of a Windows 8 line-of-business app to record work and performance times and assign them to projects/orders using Microsoft Dynamics CRM as the backend system
Technologies: C#/XAML, Windows 8/WinRT, MVVM, .NET 4.5, layered architecture, caching, user experience, Visual Studio 2012, Team Foundation Server 2012, Microsoft Dynamics CRM 2011, OData, LINQ, SQLite, Scrum

Jan 2011 - Sep 2012

1 year 9 months

Senior Developer: Smart Card and Security Applications

Development of a new one-time password application
Technologies: C#, .NET 4.0, Enterprise Library, moq, Coded UI Tests, Visual Studio 2010, Scrum

Jan 2010 - Sep 2013

3 years 9 months

Lead Developer: Healthcare Industry

Developed a distributed practice application for a therapy center
Technologies: C#, .NET 4.0, WPF, WCF, Entity Framework, Enterprise Library, DevComponents UI Controls, SQL Server 2008, Visual Studio 2010, Team Foundation Server 2010, LINQ

Oct 2009 - Dec 2010

1 year 3 months

Senior Developer: Chip Card and Security Applications

Further developed a TPM application with its management server
Technologies: C#, ASP.NET 3.5 Web Forms, Coded UI Tests, Visual Studio 2008/2010, Scrum

Aug 2005 - Aug 2008

3 years 1 month

Enterprise Developer: Surveying

Developed a new distributed product framework for GPS surveying applications to process real-time data
Technologies: C#, .NET 2.0/3.5, Windows Forms, .NET Remoting, Windows Services, SQL Server 2005, XML, Enterprise Library, Visual Studio 2005 Team System, MSTest

Industry Experience

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

Experienced in Information Technology, Healthcare, Retail, Transportation, and Banking and Finance.

Information Technology

Healthcare

Retail

Transportation

Banking and Finance

Business Area Experience

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

Experienced in Information Technology, Product Development, and Sales.

Information Technology

Product Development

Sales

Summary

As a freelance .NET senior software developer/architect, I support my clients in the development process, architecture design, coaching measures, and technical project management.

I master the complete .NET development environment.

My core competency is in developing mobile business apps with Xamarin.Forms or .NET MAUI and .NET web development with Blazor.

Skills

Mobile – .Net Maui, Xamarin.Forms, Xamarin.Ios, Xamarin.Android, Uwp, Azure Mobile Apps, Mvvmcross, Sqlite, Visual Studio App Center, Skiasharp, Reactive
Windows – C# / .Net, Xaml, Wpf, Uwp, Winui, Mahapps.Metro
Backend – Asp.Net Core Web Api, Rest, Odata, Wcf, Web Services, Entity Framework, Linq, Windows Services
Web – Blazor, Mudblazor, Javascript, Html5, Css3, Bootstrap, Single Page Applications
Testing – Xunit, Moq, Xamarin Ui Test
Engineering / Responsibilities – Clean Code, Software Quality, Software Design, Design Patterns, Architecture: Layers, Mvc, Mvvm, Client / Server, Unit Testing, Tdd, Code Reviews, Pair Programming, Coding Guidelines, Scrum / Agile, Process Models, Tfs, Git, Visual Studio, Resharper, Visual Studio For Mac, Ui Design, Usability, User Experience, Analysis: Business, Technical, Conceptual, Ooa/Ood, Uml, Lead Developer, Consultant, Coach

Languages

German

Advanced

English

Advanced

Education

Diploma in Computer Science (University) · Computer Science

Certifications & licenses

Xamarin Certified Mobile Mobile Developer

Xamarin.iOS

Xamarin Certified Mobile Developer

SQLite

Visual Studio App Center

Microsoft Technical Summit

Reactive Azure Solutions Certification

Microsoft 70-532 Developing Microsoft

SkiaSharp

SCRUM Master Training + Certification

Management 3.0 Training

MahAps.Metro

Lead Developer: Tasks and Workshop

ASP.NET Core Web API

Entity Framework, LINQ

iSAQB Architecture Days

OData

Visual Studio ALM Days 2012

Xamarin.Android

DWX Developer Week

Statistics

Experience

Total positions 18

Experience in Information Technology 12.5 y

Avg length 1 y 6 m

Longest experience 3 y 8 m

Expertise

Recent roles Senior Developer, Coach: Retail, Senior Developer, Coach: Logistics, Lead Developer: Public Transport

Main industries Information Technology, Healthcare, Retail

Main business areas Information Technology, Product Development, Sales

Qualifications

Highest degree Master

Certifications earned 14

Profile

Created

March 2025

Last Update

May 2026

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Frequently asked questions

Have questions? Find more information here.

Where is Markus based?

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

What languages does Markus speak?

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

How many years of experience does Markus have?

Markus has at least 19 years of experience. During this time, Markus has worked in at least 14 different roles. The average length of individual experience is 1 year and 1 month. Note that Markus may not have shared all experience and actually has more experience.

What roles would Markus be best suited for?

Based on recent experience, Markus would be well-suited for roles such as: Senior Developer, Coach: Retail, Senior Developer, Coach: Logistics, Lead Developer: Public Transport.

What is Markus's latest experience?

Markus's most recent position is Senior Developer, Coach: Retail.

Which industries is Markus most experienced in?

Markus is most experienced in industries like Information Technology, Healthcare, and Retail. Markus also has some experience in Transportation, Banking and Finance, and Manufacturing.

Which business areas is Markus most experienced in?

Markus is most experienced in business areas like Information Technology, Product Development, and Sales. Markus also has some experience in Business Intelligence.

Which industries has Markus worked in recently?

Markus has recently worked in industries like Retail, Transportation, and Information Technology.

Which business areas has Markus worked in recently?

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

What is Markus's education?

Markus holds a Master in Computer Science.

Does Markus have any certificates?

Markus has 14 certificates. Among them, these include: Xamarin Certified Mobile Mobile Developer, Xamarin.iOS, and Xamarin Certified Mobile Developer.

What is the availability of Markus?

Markus is immediately available for suitable projects.

What is the rate of Markus?

Markus's rate depends on the specific project requirements. Please use the Meet button on the profile to schedule a meeting and discuss the details.