
About Marius
Shopify & Next.js developer — Leiden, Netherlands
I'm a full-stack developer based in Leiden, Netherlands. I build e-commerce stores and custom web applications for brands that need more than a template. Every project is built by me personally — no outsourcing, no junior devs, no handoffs. That means faster delivery, direct communication, and someone who actually cares about the result.
I work with clients across Europe, the UK, the US, and beyond. Most projects start within three days of the first call and ship in under two weeks.
What I do
My day-to-day work falls into three buckets:
- Shopify stores — new builds, theme customization, store rebuilds, and speed optimization for stores that aren't converting
- Custom Next.js applications — e-commerce, B2B portals, and internal tools built on Next.js, Supabase, and Tailwind CSS
- Tracking & analytics — Meta Pixel, GA4, Klaviyo, and Conversions API setup so paid ads can actually optimize
I don't do WordPress, I don't do hourly billing, and I don't take on projects I can't ship myself. The stack stays modern (Shopify Liquid, Next.js, Supabase, Tailwind) and the scope stays honest.
Recent work
The most public project is MurmReps — a multi-currency Next.js storefront managing 15,000+ products with Klaviyo, Meta Pixel, and GA4 integration. Built end-to-end on Next.js and Supabase. Most other client work is under NDA, but the homepage project section covers what I can share.
Why fixed pricing
I don't bill by the hour. Hourly billing creates the wrong incentives for everyone — the developer is rewarded for being slow, and the client never knows what the final number will be. Every project I take on is quoted as a fixed price up front, with a clear scope and a clear deliverable. If something takes me longer than expected, that's my problem, not the client's. Full pricing is on the pricing page.
Quick facts
- Name
- Marius Kerkvliet
- Location
- Leiden, Netherlands
- Business
- murmweb.dev
- KVK
- 99702738 (Dutch Chamber of Commerce)
- hello@murmweb.dev
- Phone
- +31 6 5562 9684
- Languages
- English, Dutch
- Stack
- Shopify Liquid, Next.js, Supabase, TypeScript, React, Tailwind CSS
Have a Shopify or Next.js project in mind?
Get in touch →