Sascha Kiefer
Co-Chief Executive Officer at vensas GmbH
Germany
Summary
👤
Senior🎓
Top SchoolSascha Kiefer is a seasoned software leader and Co-CEO based in Germany, combining over 16 years of professional experience with a 27-year background in software development and IT consulting. He brings a full-stack toolbox spanning mobile (Xamarin, Flutter), backend (.NET, Node.js), trading systems (C++, FIX, Bloomberg/Reuters APIs) and embedded/secure systems, with a history of solving performance-critical and memory issues at scale. As a freelancer and consultant he has repeatedly delivered cross-platform mobile apps, blockchain-enabled web apps, and production-line optimization software for clients like SAP and HelloFresh. Sascha is an active open-source contributor focused on both front-end UX improvements (Flutter intro slider accessibility) and backend robustness (enhancing OAuth2 .NET clients), reflecting a pragmatic blend of UX sensibility and engineering rigor. His background in information security (MCA) and low-level systems work gives him an unusual comfort navigating both high-level product strategy and intricate protocol- or performance-level problems.
16 years of coding experience
20 years of employment as a software developer
University-entrance diploma, University-entrance diploma at Wirtschaftswissenschaftliches Gymnasium SaarbrückenMaster of Computer Applications (MCA) Computer and Information Systems Security/Information Assurance, Master of Computer Applications (MCA) Computer and Information Systems Security/Information Assurance at Universität des SaarlandesDiploma, Diploma at Donegal High School
German, English, French
Stackoverflow
10,800reputation
1.2mreached
179answers
78questions
file-upload
top-5%
reflection
top-5%
textbox
top-5%
Github Skills (27)
flutter-apps10
net10
dotnet10
asp-net10
dotnet-core10
flutter-game10
sliders10
dart10
csharp10
oauth10
flutter10
api-design9
restful-api9
reflection9
api-rest9
Programming languages (17)
Github contributions (5)
titarenko/OAuth2
Jan 2013 - Jan 2013
OAuth2 client implementation for .NET
Role in this project:
Back-end Developer
Back-end DeveloperContributions:6 commits in 2 days
Contributions summary:Sascha focused on enhancing the `OAuth2` client implementation for .NET. Their contributions included adding features to facilitate easier integration of custom clients and improving code robustness. Key changes involved modifying the `AuthorizationRoot` class and related components to support new client types and API integrations. Further improvements included refactoring and cleanup of the project's structure.
dotnetoauth2-provideroauth2oauthoauth2-client
duytq94/flutter-intro-slider
Sep 2020 - Sep 2020
Simple and configurable app introduction slider for Flutter
Role in this project:Front-end Developer
Front-end DeveloperContributions:5 commits, 1 PR, 1 comment in 5 days
Contributions summary:Sascha focused on enhancing the UI of the Flutter intro slider. Their primary contributions involved implementing a scrollbar for the intro slides, including options for behavior such as always showing the scrollbar, hiding it, or showing it on scroll. They refactored the code to use `SingleChildScrollView` for improved scrollability, and adapted the UI for iOS by using `CupertinoScrollbar`. These changes improved the user experience and accessibility of the introduction slider.
configurableautoplaynavigation-drawersliderflutter
Find and Hire Top DevelopersWe’ve analyzed the programming source code of over 60 million software developers on GitHub and scored them by 50,000 skills. Sign-up on Prog,AI to search for software developers.