Stefan Kassler - Developer C# .NET/WPF

Q: Where is Stefan based?

Stefan is based in Halle (Saale), Germany and can operate in on-site , hybrid , and remote work models.

Q: What languages does Stefan speak?

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

Q: How many years of experience does Stefan have?

Stefan has at least 13 years of experience. During this time, Stefan has worked in at least 11 different roles and for 11 different companies . The average length of individual experience is 1 year and 2 months . Note that Stefan may not have shared all experience and actually has more experience.

Q: What is Stefan's latest experience?

Stefan's most recent position is Developer C# .NET/WPF at Hessian Centre for Data Processing .

Q: What companies has Stefan worked for in recent years?

In recent years, Stefan has worked for Hessian Centre for Data Processing , Brooks Automation (Germany) GmbH , TQ-Systems GmbH , and E.ON Digital Technology GmbH .

Q: Which industries is Stefan most experienced in?

Stefan is most experienced in industries like Information Technology (IT) , Manufacturing , and Energy . Stefan also has some experience in Automotive , Healthcare , and Education .

Q: Which business areas is Stefan most experienced in?

Stefan is most experienced in business areas like Information Technology (IT) , Product Development , and Project Management . Stefan also has some experience in Research and Development (R&D) and Quality Assurance (QA) .

Q: Which industries has Stefan worked in recently?

Stefan has recently worked in industries like Energy , Manufacturing , and Education .

Q: Which business areas has Stefan worked in recently?

Stefan has recently worked in business areas like Information Technology (IT) , Project Management , and Product Development .

Recommended expert

Halle (Saale), Germany

Experience

Nov 2023 - Jul 2024

9 months

Developer C# .NET/WPF

Hessian Centre for Data Processing

Redeveloped outdated software for the Hessian school system in C# .NET/WPF
Understanding and analyzing old Delphi and Visual Basic 6 source code
Using Visual Studio 2022 as the IDE
Team collaboration through pull requests and version control with Git/SourceTree
Project management using custom wiki software and OpenProject
TechStack: C#, .NET 8.0, WPF, Visual Studio 22, Delphi, Visual Basic 6, LDAP, Active Directory, FTP, SMB, Git, SourceTree
Workflow: pull requests, OpenProject, weeklies, weekly meetings, dynamic communication

May 2023 - Jun 2023

2 months

C#/.NET Developer

Brooks Automation (Germany) GmbH

Further development of the user software for complex semiconductor cleaning machines according to SEMI standards
Background communication with PLC software for machine control
Using the Spring.NET framework alongside standard .NET components
Development in Visual Studio 2019 with ReSharper
Team collaboration via pull requests and version control with Git/SourceTree
Project management with Atlassian Confluence and Azure DevOps
Introduced a SCRUM model with daily stand-ups
Full communication in English
TechStack: C#, .NET Framework, Spring.NET, Git, SEMI standard, Visual Studio 2019, ReSharper, PLC, Semiconductor

Jan 2022 - Sep 2022

9 months

Full-Stack Developer

TQ-Systems GmbH

Further development of apps on embedded devices with Go for the backend and Vue.JS for the frontend
Development in an Ubuntu 20.04 LTS VM using Visual Studio Code
Containerizing each app in Docker containers
Quality assurance through unit tests in Go and integration tests with Cypress
Team collaboration with merge requests and version control via GitLab
Automated pipelines in GitLab CI for testing on merge requests
Project management with Jira and Confluence in a SCRUM framework (dailies, weeklies, sprint meetings, retrospectives)
TechStack: Go, Vue.JS, JavaScript, GitLab, Docker, Ubuntu, Visual Studio Code, Webpack, Cypress, MQTT, Modbus, D-Bus, Yocto, Yarn, BASH, microservices, REST API

Jan 2020 - May 2021

1 year 5 months

Freelancer C#/.NET Developer

E.ON Digital Technology GmbH

Continued operation and maintenance of an old CRM program in C#/.NET
Providing conversation guides as forms with Vue.JS and RTI Designer
Development in Visual Studio 2019, RTI Designer, and Visual Studio Code for Vue.JS/JavaScript
Version control with TortoiseGit
Project management with Jira and Confluence in a SCRUM model (dailies, weeklies)
TechStack: C#, .NET, JavaScript, Vue.JS, Node.js, CSS, HTML, RTI Designer, REST API, web services, microservices, SoapUI, Postman, Git Bash, TortoiseGit, CosmosDB, AWS

Jan 2019 - Mar 2019

3 months

Freelancer Software Developer

DAVASO GmbH

Analysis and comprehensive documentation of a 13-year-old codebase in 2 months
Adapting the software to new legal requirements
Working with Transact-SQL on MS SQL Server, C++ and C#/.NET components, and Perl scripts
Adapting and further developing the client's website with PHP 7/Zend 1/Composer/Smarty and PrototypeJS
Development tools: various Visual Studio versions, MS SQL Server Management Studio, Eclipse Oxygen 3
Version control with WinCVS
Project management with Jira and wiki in a SCRUM framework (dailies, sprints)
TechStack: C#, .NET, C++, MS-SQL Server 2008, PHP 7, Zend 1, JavaScript, jQuery, PrototypeJS, Transact-SQL, Composer, Smarty, Perl

Jul 2018 - Dec 2018

6 months

Unity3D/VR Developer

Carmeq GmbH

Continued development of a comprehensive driving simulation with VR integration
Simulation of driving and charging scenarios for electric cars with hardware feedback (steering wheel, pedals)
Use of HTC Vive Pro and Leap Motion for hand tracking
Development in Unity3D with VRTK and Visual Studio
Project management with Jira and Confluence
TechStack: Unity3D, C#, mono, VR, AR, HTC Vive Pro, Leap Motion, SVN

Aug 2017 - Sep 2018

1 year 2 months

Delphi Developer

form & function GmbH

Development of a database application in Delphi for planning maintenance procedures based on sensor input from industrial equipment
Calculation of wear and maintenance intervals
Integration with PostgreSQL database and existing software suite
TechStack: Delphi 10.2, PostgreSQL, zeoslib, dcpcrypt2

Nov 2016 - Aug 2017

10 months

VR Learning Software Developer

LeFx GmbH

Implementation of a VR learning software with gamification elements for the automotive industry
Development of a scenario editor and a custom scripting language with parser and interpreter
Use of Unity3D with VRTK and HTC Vive hardware
Project management with Jira and Confluence
TechStack: Unity3D, C#, mono, VRTK, HTC Vive, UniRx, Perforce

Apr 2015 - May 2016

1 year 2 months

Lead Gameplay Developer

FAKT Software GmbH

Development of level and object editors for "Crazy Machines 3" on a custom engine
Implementation of complex mathematical functions
Development in C++ with Visual Studio and in-house engine
Version control with Git (SourceTree GUI)
Project management with Jira and Confluence using Scrum (daily meetings, one-week sprints)
TechStack: C++, 3D programming, physics programming, Visual Studio 13/15

Oct 2013 - Sep 2014

1 year

Startup Software Developer

EXIST-Stipendium

Solo work on medical software for early detection of vascular diseases using OCT image analysis
TechStack: Delphi 7, image processing, medical software

Mar 2008 - Sep 2013

5 years 7 months

Founder and Developer

SAFKAS Games

Founded and led my own software company during my studies
Developed games in Delphi 7 and Andorra2D
Implemented small web projects and my own website in PHP and JavaScript
Tech stack: Delphi 7, Andorra2D, PHP, JavaScript, MySQL, HTML, CSS

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 Information Technology (7.5 years), Manufacturing (2 years), Energy (1.5 years), Automotive (1 year), Healthcare (1 year), and Education (0.5 years).

Information Technology

Manufacturing

Energy

Automotive

Healthcare

Education

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 (11.5 years), Product Development (9.5 years), Project Management (4.5 years), Research and Development (1 year), and Quality Assurance (0.5 years).

Information Technology

Product Development

Project Management

Research and Development

Quality Assurance

Skills

Programming: C#, .Net, Wpf, C, C++, Vue.js, Javascript, Delphi, Php, Unity3d, Go, Mysql, Ms Sql, Postgresql, Css, Html, Perl, Bash, Typescript, Basic, Turbo Pascal
General Approach: Agile Software Development, Scrum, Object-oriented Programming, Leading My Own Development Teams, Documenting Source Code And Projects, An Eye For Software Architecture, Creating Requirement Specifications, Strong Communicator And Team Player, Results-oriented
Ides: Visual Studio, Visual Studio Code, Rti Designer, Delphi (2, 5, 7, Xe2, 10, 11), Unity3d, Eclipse
Toolchain: Git, Gitlab, Svn, Sourcetree, Perforce, (Win)cvs, Docker, Ansible, Cypress, Soapui, Postman, Yocto
Frameworks / Components - Web Development: Vue.js, Node.js, Webpack, Angular, Jquery, Symfony, Zend, Prototypejs, Composer, Enyo
Frameworks / Components - C#: .Net, Wpf, Spring.net, Unity3d, Vrtk, Unirx
Frameworks / Components - Go Lang / Embedded Systems: Modbus, D-bus, Plc
Frameworks / Components - Delphi: Zeoslib, Unidac, Mydac, Dcpcrypt2, Andorra2d
Frameworks / Components - General: Mqtt, Microservices, Rest Api, Web Services
Collaboration: Jira, Confluence, Azure Devops, Mantis Bt, Trello, Ms Teams, Skype, Rocket.chat, Zoom, Discord, Bbb
Hardware: Htc Vive Pro, Leap Motion, Microsoft Hololens
Formats: Json, Xml, Html, Css, Rauc, Pdf, Word, Excel
Operating Systems: Windows (From 95), Ubuntu (From 18.04), Ms-dos (From 3.0)

Languages

German

Advanced

English

Advanced

Education

Oct 2001 - Jun 2010

University of Leipzig

Master's degree · Computer Science, Logic, and Philosophy of Science · Leipzig, Germany

Profile

Created

June 2025

Last Update

July 2025

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Frequently asked questions

Do you have questions? Here you can find further information.

Where is Stefan based?

Stefan is based in Halle (Saale), Germany and can operate in on-site, hybrid, and remote work models.

What languages does Stefan speak?

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

How many years of experience does Stefan have?

Stefan has at least 13 years of experience. During this time, Stefan has worked in at least 11 different roles and for 11 different companies. The average length of individual experience is 1 year and 2 months. Note that Stefan may not have shared all experience and actually has more experience.

What roles would Stefan be best suited for?

Based on recent experience, Stefan would be well-suited for roles such as: Developer C# .NET/WPF, C#/.NET Developer, Full-Stack Developer.

What is Stefan's latest experience?

Stefan's most recent position is Developer C# .NET/WPF at Hessian Centre for Data Processing.

What companies has Stefan worked for in recent years?

In recent years, Stefan has worked for Hessian Centre for Data Processing, Brooks Automation (Germany) GmbH, TQ-Systems GmbH, and E.ON Digital Technology GmbH.

Which industries is Stefan most experienced in?

Stefan is most experienced in industries like Information Technology (IT), Manufacturing, and Energy. Stefan also has some experience in Automotive, Healthcare, and Education.

Which business areas is Stefan most experienced in?

Stefan is most experienced in business areas like Information Technology (IT), Product Development, and Project Management. Stefan also has some experience in Research and Development (R&D) and Quality Assurance (QA).

Which industries has Stefan worked in recently?

Stefan has recently worked in industries like Energy, Manufacturing, and Education.

Which business areas has Stefan worked in recently?

Stefan has recently worked in business areas like Information Technology (IT), Project Management, and Product Development.

What is Stefan's education?

Stefan holds a Master in Computer Science, Logic, and Philosophy of Science from University of Leipzig.

What is the availability of Stefan?

Stefan is immediately available full-time for suitable projects.

What is the rate of Stefan?

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