About
Hi! I'm Jonathan Nielsen, a freelance fullstack developer with 7+ years of professional experience building modern websites, scalable web applications, CMS platforms, and design systems - both independently and as part of larger development teams.
Contact me for any enquiries or just say hello: jonathan.sparvath@gmail.com
Work Experience ↓
Period Company Role
- Jun 2025 - Sep 2025 Frankly Freelance Frontend Developer
- May 2024 - Aug 2024 Delogue Freelance Web Developer
- Sep 2022 - Dec 2022 Frankly Freelance Frontend Developer
- Sep 2021 - Jan 2022 NoA Ignite Freelance Web Developer
- May 2021 - Apr 2024 Delogue Freelance Web Developer
- Apr 2021 - Sep 2021 Mercell Freelance Fullstack Developer
- Apr 2020 - Apr 2021 SOUNDBOKS Frontend Developer
- Nov 2019 - Feb 2020 DHI Freelance Frontend Developer
- Aug 2019 - Aug 2019 Danmarks Miljøportal Freelance Fullstack Developer
- Jun 2019 - Aug 2019 Jonas Elsgaard Freelance Frontend Developer
- Sep 2017 - Apr 2017 Kraftvaerk Student Fullstack Developer
- Period Jun 2025 - Sep 2025Company FranklyRole Freelance Frontend Developer
- Period May 2024 - Aug 2024Company DelogueRole Freelance Web Developer
- Period Sep 2022 - Dec 2022Company FranklyRole Freelance Frontend Developer
- Period Sep 2021 - Jan 2022Company NoA IgniteRole Freelance Web Developer
- Period May 2021 - Apr 2024Company DelogueRole Freelance Web Developer
- Period Apr 2021 - Sep 2021Company MercellRole Freelance Fullstack Developer
- Period Apr 2020 - Apr 2021Company SOUNDBOKSRole Frontend Developer
- Period Nov 2019 - Feb 2020Company DHIRole Freelance Frontend Developer
- Period Aug 2019 - Aug 2019Company Danmarks MiljøportalRole Freelance Fullstack Developer
- Period Jun 2019 - Aug 2019Company Jonas ElsgaardRole Freelance Frontend Developer
- Period Sep 2017 - Apr 2017Company KraftvaerkRole Student Fullstack Developer
Technologies → ↓
I specialize in modern technologies to ensure fast and reliable results.
- React
- Next.js
- Tailwind CSS
- TypeScript
- Tanstack query
- Storybook
- CSS3
- HTML5
- Shadcn
- Material UI
- Playwright
- Cypress
- Node.js
- Express
- C#
- .NET Core
- Sanity CMS
- Umbraco CMS
- AWS
- Netlify
- Vercel
- Azure
- Docker
- Claude Code
- Agentic workflows
- Figma