Simon Lasselsberger
Founder at Simon Lasselsberger - Lasssim
Austria
Summary
👤
Senior🎓
Top SchoolSimon Lasselsberger is a founder and software architect with 13 years of experience designing scalable web architectures and leading backend teams, notably growing Runtastic from a few users to over 130 million registered users and helping steer two acquisitions. He advises startups and established companies through his firm Lasssim, combining hands-on architecture, mentoring, and decision-maker coaching with pragmatic guidance for microservices and cloud-native systems. A former hardware designer turned software-first engineer, he brings a systems-level perspective that helps teams reason across hardware constraints, infrastructure, and higher-level abstractions. He also teaches Scalable Web Architectures at FH Salzburg and contributes to open-source tooling such as enhancements to a popular VS Code Draw.io extension, reflecting his focus on developer experience. Outside work he’s an avid Ultimate Frisbee and tennis player, woodworker, and occasional DJ — a blend of technical rigor and creative hobbies that informs his practical, people-centered approach to architecture.
13 years of coding experience
4 years of employment as a software developer
Master's degree, Hardware/Software Systems Engineering, Master's degree, Hardware/Software Systems Engineering at University of Applied Sciences Upper Austria
Github Skills (11)
typescript10
javascript10
typescripts10
vscode-extension10
typescript-types10
diagramming9
configuration-management9
user-interface8
interface-design8
ui-design8
diagram6
Programming languages (6)
Github contributions (5)
hediet/vscode-drawio
Oct 2021 - Oct 2021
This unofficial extension integrates Draw.io (also known as diagrams.net) into VS Code.
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:8 commits, 7 comments in 9 days
Contributions summary:Simon focused on enhancing the functionality and configurability of the Draw.io extension for VS Code. They implemented settings for styles, custom color schemes, default vertex and edge styles, and color names, providing users with more control over the visual appearance of diagrams. The commits modified several key files, including configuration files and client-side code, demonstrating a focus on both the user interface and the underlying logic of the extension. These changes aimed to improve the customization options and user experience within the VS Code integration.
diagramsmermaiddrawvscode-extensiondrawio
lasssim/diagrams.net-templates
Nov 2021 - Nov 2022
Contributions:6 releases, 26 commits, 18 pushes in 1 year
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