Peer Richelsen
Co-Founder at Cal.com, Inc.
United States
Summary
🤩
Rockstar🎓
Top SchoolPeer Richelsen is a serial founder and product-focused engineer with eight years of experience building consumer-facing web products and developer tools. As Co-Founder of Cal.com he drives scheduling infrastructure and contributes hands-on to React/Next.js front-end work, helping shape UI components for a fast-growing open-source project. Previously he founded and scaled Mage App (a YC W19 company), raising $880K and serving 50k customers while leading product and engineering. He also founded Lean Hire and led its acquisition by On Deck, where he later ran product and hiring efforts. Based in the United States with a background in Business Information Technology, he blends startup grit, design-minded front-end craftsmanship, and a track record of turning niche ideas into scalable businesses.
8 years of coding experience
6 years of employment as a software developer
Alumni, Winter 2019, W19, Alumni, Winter 2019, W19 at Y CombinatorBusiness Information Technology, Business Information Technology at The University of Kiel
Github Skills (7)
typescript10
nextjs10
typescripts10
react10
typescript-types10
css7
html7
Programming languages (14)
Github contributions (5)
calcom/cal.com
Apr 2021 - Jan 2023
Scheduling infrastructure for absolutely everyone.
Role in this project:
Front-end Developer
Front-end DeveloperContributions:33 releases, 2917 reviews, 625 commits in 1 year 9 months
Contributions summary:Peer primarily focused on front-end development, implementing and updating UI components within the React/Next.js framework. Their work included updating and refining descriptions and also contributing to the design of interactive components such as form fields and other UI-related tasks. The user's contributions show a focus on UI improvements by altering the styles and layout of the components.
tailwindcssturborepotrpcprismascheduling
calcom/platform-starter-kit
Jun 2023 - Mar 2025
Cal.com Platform: Starter Kit
Contributions:8 reviews, 10 PRs, 57 pushes in 1 year 9 months
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