E-Commerce Development

Shopify stores built to turn your ad spend into sales, not bounces

2 days ago

Performance Optimization
Front-End Development
E-Commerce Development
Full-Stack Development
API Design

Shopify stores built to turn your ad spend into sales, not bounces cover

Overview

Most Shopify stores don't have a traffic problem. They have a conversion problem. You pour money into ads. People land. Look around. Leave. And you blame the ads. It's usually the store. I build Shopify stores engineered on buyer psychology, so the visitors you already pay for actually buy. What you get: • Custom Shopify store designed to convert, not to win design awards • Payments, shipping and taxes connected in one system • Migration from your old platform with zero data loss • Integrations: email marketing, accounting, inventory, suppliers, parcel lockers • Support through launch until the first orders come in Proof: MeriWoolArt got +42% conversions. Draco Slides got +23% conversions after we sped up their Shopify store. Why me: 5+ years, 200+ US & EU brands, 4.9 rating. Sites we've built serve 1,500,000+ customers. Projects start from $2,400 + VAT. Every build begins with a free estimate, so you know exactly what you're paying for before a cent moves. Send me your current store (or your idea). I'll tell you straight whether I can make it profitable.

Deliverables

Custom Shopify store designed and built for conversions
Payments, shipping and taxes connected and tested
Migration from your old platform with zero data loss
Email, accounting and inventory integrations set up
Mobile-first, speed-optimized product and checkout pages
Launch support until your first orders come in

How it works

Free call: you show me the store (or idea), I show you where the money is leaking
Fixed estimate and plan, so you know the price before a cent moves
Design and build, with progress you can see at every step
Launch, test every checkout path, and stay with you until orders roll in

FAQ

How long does a Shopify store take?

It depends on your products, integrations and whether we're migrating. You get an exact timeline together with your free estimate, before anything starts.

Can you move my store from WooCommerce, Wix or another platform?

What if I already have a Shopify store?

About the seller

Mantas Karmaza

€100M+ added via 4,000+ A/B tests for 360Cycles, Draco and over 200 other DTC brands

Lithuania

Most e-commerce sites bleed revenue. I plug the leaks, so the traffic you already pay for turns into orders. 10+ years in e-commerce growth, from RRR.lt to Flatyz.com and CCS Baltic. Founder of Mantas Digital (Vilnius, 2021). The numbers: • 4,000+ A/B tests run, €100M+ in extra revenue for clients across the US & EU • 200+ DTC brands helped • 400+ visual CRO audits delivered in 2026 • 4.9 rating across Clutch, Google, Trustpilot & Facebook (50+ verified reviews) Recent results: • 360 Degrees Cycles: €1.5M+ in sales on €30k+ invested • MeriWoolArt: +42% conversions • Draco Slides: +23% conversions, +265% mobile speed • Waterpik: 22% more orders What I do: CRO & UX audits, A/B testing, Shopify, WooCommerce & WordPress builds, speed, SEO, email & business automation, AI integration. If you want pretty, hire a designer. If you want profit, message me. Case studies: mantasdigital.com/case-studies

Member since2026

View Mantas's profile

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10% more conversions in 60 days, same traffic, or your money back Website care so your site never breaks the day your sales spike SEO that brings buyers ready to pay, not just pretty traffic graphs Find out exactly why visitors leave without buying, and fix it

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