constantsolutions.dk↗

Software that feels finished - Mattias Siø Fjellvang | Constant Solutions

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About

Senior full-stack developer and architect in Copenhagen. Fifteen years shipping products - most visibly Doubble, a dating app I architected and built from 15,000 to 300,000+ users across six markets, with an App Store rating above Tinder, Hinge and Bumble.

Technologies2detected on the homepage

Site languageEnglishdeclared by the page

Profiles & contact0published on the homepage

Last crawled2026-09-20homepage read

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Site details

Website	mattiasfjellvang.com ↗
Site language	English
PageRank position	#2,845,451
Rank · Jun–Aug 2026	#2,096,922

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