Sascha Kiefer
Co-Geschäftsführer & Softwareentwickler at vensas GmbH
Saarland, 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 (16)
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-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.
flutterslider
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.