Meermin Shoes
Shopify Plus storefrontDesign and development on a high-volume Plus footwear store: landing pages, product and collection templates, and an ERP-synced catalog running across markets.
Shopify Plus · Liquid · Theme dev meermin.com
Shopify · Storefronts · CRO
Shopify storefronts, designed and built to convert.
I design it and I build it: the theme, the product page, the cart, and the bundles and upsells that lift average order value. I've also shipped two bundle and upsell apps to the Shopify App Store, so I know those mechanics from the inside.
01
Selected Work
Golf club configurator
Storefront · CROCustom product configurator for Avoda Golf with real-time build, pricing, and validation, built straight into the storefront so a complex made-to-order product can be bought in one pass.
Shopify · Liquid · JavaScript avodagolf.com
The Knotty Ones
Shopify storefrontDesign and build for a knitwear brand: storefront design, product and collection pages, and the theme development to match.
Shopify · Liquid · UI design theknottyones.com
Le Melo
Storefront · CROBuild-a-set mix and match on the storefront: customers assemble their own bundle, with pricing and discounting handled at the cart to lift average order value.
Shopify · Liquid · JavaScript le-melo.com
Katana MRP sync
IntegrationTwo-way manufacturing and production sync between Katana MRP and Shopify over the Admin API, keeping inventory and orders in step for a production client.
Admin GraphQL API · Webhooks · Node
Tiergain
Public Shopify appMix and match bundle app with tiered discounts, free gifts, and shipping rewards, built on a discount function and theme app extensions. Built it, so I know what actually moves AOV.
Shopify Functions · Liquid · React tiergain.com
Abu
Public Shopify appA product recommendation and upsell app: related-product and add-on widgets across the product page, cart, and post-purchase, with discount bundles and analytics.
Remix · App Bridge · Polaris abuapp.io
02
Clients
tiergain 
Parting Stone
The Knotty Ones
Abu
03
Testimonials
★★★★★
Excellent service rendered by Martynas! He was professional and efficient, ensuring that all our expectations were met. We are delighted with the overall experience and highly recommend his services to others.
★★★★★
Superb work! Very hands on and easy to work with.
★★★★★
A very solutions-oriented pro! Martynas was a pleasure to work with.
★★★★★
Loved working with Martynas! Fast and clear.
★★★★★
Exactly what I needed done!
★★★★★
Kind and understandable. Thank you for your work!
★★★★★
Great, thank you.
★★★★★
Thank you.
04
Stack
- Storefront
- Themes, Liquid, Online Store 2.0, sections, metafields
- Design
- UI / UX, art direction, design systems, landing pages
- CRO
- Bundles, upsells, configurators, product page and cart flows
- Checkout
- Discount functions, cart transforms, checkout UI extensions
- Apps
- Embedded admin apps, theme app extensions, app proxy
- APIs
- Admin GraphQL, Storefront API, webhooks, bulk operations
- Integrations
- ERP / MRP sync, catalog data, order and inventory automation
- Craft
- Performance, accessibility, Core Web Vitals
05
About
A designer and a developer, building Shopify storefronts end to end.
I design the interface and then write the code that ships it, so nothing gets lost in a handoff and pixel-perfect means what it says. Most of my work is storefronts on Plus and standard plans: theme design and build, landing pages, and the conversion work on top — bundles, upsells, configurators, and the product and cart flows where the revenue is actually won or lost.
I've also shipped two bundle and upsell apps to the Shopify App Store, plus dozens of private builds running in live stores. That side is useful mainly because it means I've built the CRO mechanics myself rather than only installing someone else's.
Before Shopify I spent five years as a software engineer at Danske Bank and three years building Brickshare, a real-estate crowdfunding platform. Across enterprise and startups, I've gone from systems used at scale to greenfield products. My background is in design, which shapes how I build.