Mattias Fjellvang
Chief Technology Officer at Constant Solutions
Copenhagen, Capital Region of Denmark
Summary
🤩
Rockstar🎓
Top SchoolMattias Fjellvang is a seasoned CTO and founder with 11 years of hands-on experience building scalable consumer and SaaS platforms from MVP to multi-market scale. He led Doubble’s tech vision to ~300,000 users and billion-plus swipe volume, architecting multi-regional, auto-scaling infrastructure and high-performing matchmaking systems that outperformed major competitors on app ratings. Comfortable both shipping product features and orchestrating cross-discipline teams, he has repeatedly turned early ideas into production-ready platforms—CMS/CRM systems, e-commerce headless migrations, serverless storefronts, and security-focused tools. Based in Copenhagen, he pairs deep full-stack expertise (Node/React, serverless, cloud infra) with a public-facing interest in cybersecurity and pragmatic business strategy. Currently on sabbatical, he’s available to consult on scaling, security, and product-led engineering challenges.
11 years of coding experience
11 years of employment as a software developer
Baunehøj EfterskoleN. Zahles GymnasieskoleInnovation, Innovation at Niels BrockSkovgårdsskolen
Danish, English, Swedish, Norwegian
Github Skills (200)
autocomplete10
http-client10
visual-studio10
google-maps10
google-tag-manager10
lazyload10
api10
full-stack10
selector10
nodejs10
phone-number-input10
css10
oracle10
orm10
png10
Programming languages (24)
Github contributions (5)
simplenotezy/typeorm
Jun 2022 - Aug 2024
ORM for TypeScript and JavaScript (ES7, ES6, ES5). Supports MySQL, PostgreSQL, MariaDB, SQLite, MS SQL Server, Oracle, SAP Hana, WebSQL databases. Works in NodeJS, Browser, Ionic, Cordova and Electron platforms.
Contributions:18 pushes, 1 branch in 2 years 1 month
ionic-cordovasap-hanahanaormsql-server
simplenotezy/phone_form_field
Feb 2023 - Nov 2023
Flutter phone number input
Contributions:20 pushes, 8 branches in 8 months
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