Sebastian Seilund
Co-Founder at Arc Edge
Copenhagen, Capital Region of Denmark
Summary
👤
Senior🎓
Top SchoolSebastian Seilund is a veteran software founder and engineer with 13 years of experience building product-led SaaS platforms and developer-facing web applications from Copenhagen. He co-founded and scaled Userflow, a user onboarding product for SaaS companies that exited in January 2024, and now leads Arc Edge as Co-Founder. Sebastian combines hands-on front-end craftsmanship—evidenced by notable contributions to the Ember.js framework around components, rendering, and testing—with CEO-level product and growth experience. His background spans early-stage startups and tech giants, including a stint at Google, plus founding Denmark’s first user-friendly accounting startup, Billy. He’s comfortable shipping across the stack, turning complex UX problems into pragmatic software, and often surfaces engineering improvements that reduce friction in component-driven UIs. Colleagues describe him as a pragmatic builder who pairs attention to developer experience with a founder’s focus on measurable product metrics.
13 years of coding experience
18 years of employment as a software developer
Software Engineering, Software Engineering at IT-Universitetet i KøbenhavnFalkonergårdens Gymnasium
Stackoverflow
454reputation
62kreached
8answers
1question
Github Skills (10)
emberjs10
javascript10
ember10
testing9
handlebars9
javascript-framework6
sql-server6
ember-data6
model-view-controller6
tsql6
Programming languages (11)
Github contributions (5)
emberjs/ember.js
Mar 2013 - Oct 2013
Ember.js - A JavaScript framework for creating ambitious web applications
Role in this project:
Front-end Developer
Front-end DeveloperContributions:14 commits in 7 months
Contributions summary:Sebastian primarily contributed to the Ember.js framework by implementing new features and fixing bugs related to the component and view layers. Their work included adding a `length` property to `Ember.Map`, addressing issues with action unregistration in virtual views, and modifying the render helper to correctly handle multiple model scenarios. The user's commits also included improvements in documentation and testing, specifically addressing the use of JSDoc and ensuring correct behavior of action contexts within components.
web-applicationsjavascript-frameworkjavascriptemberjsember
billysbilling/ember-tool
Oct 2015 - Jul 2018
Contributions:1 PR, 1 push, 1 tag in 2 years 9 months
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