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Mantas Karmaza

Available for work

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

Based out of LithuaniaReview this user

Shopify DevelopmentUX / UI DesignBusiness Process Automation

Portfolio8

Open a project to see it in full
  • Waterpik Lithuania: 22% more orders after CRO audit & redesignThe official Waterpik store in Lithuania (waterpik.lt) had traffic but was leaving orders on the table. We ran a CRO audit, then designed and built the recommended changes and optimized the store for mobile, while keeping existing SEO rankings and traffic intact. Client-reported result: 22% more orders.mantasdigital.com
  • Gaivus Kvapas: faster, mobile-first WooCommerce store after CRO auditOral and body care store in Lithuania (gaivuskvapas.lt). We audited what was blocking conversions, redesigned the UI/UX and rebuilt the WooCommerce codebase. Result: a faster, clearer store that works better on mobile, on a new codebase built for long-term stability.mantasdigital.com
  • Charity fund: automated donations website + €10,000/month ad supportDesigned and built a secure, easy-to-use website for a charity and support fund with automated donation features, and secured EUR 10,000/month in advertising support. Ongoing consulting and technical maintenance.mantasdigital.com
  • 360 Degrees Cycles: 70% email open rates with POS + Omnisend automationConnected the online store and Lightspeed POS of a major European cycling and repair retailer to Omnisend with a custom API integration. In-store and online data now feed one customer profile, powering segmentation, automated service reminders and post-purchase upsells, and replacing SMS updates staff used to send by hand. Results featured by Omnisend: 70% average open rates, 15-30% click-through rates and 422 contacts reactivated before the holidays.omnisend.com
  • MeriWoolArt: +42% conversions with a wholesale Shopify store & CROBuilt a wholesale Shopify store for MeriWoolArt, a yarn manufacturer selling to retail and wholesale customers, working around Shopify's platform limits. Also optimized the retail store for conversions, mobile and speed. Client-reported result: +42% conversions.mantasdigital.com
  • Flatyz: Shopify stores launched in 2 marketsShopify development for Flatyz, a maker of premium handmade candles, to expand into two markets: market-specific design, catalog customization, translations, conversion optimization and consulting.mantasdigital.com
  • BBQ4You: orders, stock & VAT synced automatically (Sage + WooCommerce)Integrated Sage with WooCommerce through Make.com for BBQ4You (bbq4you.ie), an Irish grill and accessories retailer: automatic syncing of orders, customers, payment methods and inventory, VAT refund calculation across 3 rates, and debit/credit statements.mantasdigital.com
  • Draco Slides: +23% conversions from Shopify speed optimizationShopify speed optimization for Draco Slides, a US footwear and clothing brand: image optimization, cleaner code and removal of inefficient scripts, browser caching, JavaScript and CSS compression, and load-priority tuning. Google PageSpeed went from 53 to 91 on mobile and from 95 to 99 on desktop. Results: +265% mobile speed, +40% desktop speed, +23% conversions.mantasdigital.com

About

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

Services 12

See all services
  • Marketing & Growth10% more conversions in 60 days, same traffic, or your money backPosted 2 days ago
  • Web & App DevelopmentWebsite care so your site never breaks the day your sales spikePosted 2 days agoFrom$40 /month
  • Marketing & GrowthSEO that brings buyers ready to pay, not just pretty traffic graphsPosted 2 days agoFrom$800 /month

Experience 4

  • Founder & CRO Specialist

    Mantas Digital, MBSelf-employed
    Jan 2021 – Present5 yrs 11 mosLithuania

    Run a CRO studio for e-commerce brands: visual CRO and UX/UI audits, A/B testing, landing and product page redesigns, web design and development, store migrations, site speed and SEO.

    Results

    • 4,000+ A/B tests run, generating €100M+ in additional revenue across the US and EU for 200+ DTC brands. 400+ visual CRO audits delivered in 2026. €1.5M+ sales for 360 Degrees Cycles on €30k+ invested, +23% conversions for Draco Slides, 22% more orders for Waterpik, +42% conversions for MeriWoolArt. 4.9 rating across Clutch, Google, Trustpilot & Facebook (50+ verified reviews).
  • AD

    IT Specialist (CRO & Web Development)

    ARNO DigitalContract
    Oct 2019 – Jan 20211 yr 4 mosRemote

    Conversion rate optimization: website CRO audits, planning CRO campaigns and A/B testing. Website development: built Shopify and WordPress sites and coded new functionality. Graphic design for social media and ad banners. Facebook and Instagram paid ads.

  • LM

    Social Media Marketing Specialist

    Lucid MarketingFreelance
    Aug 2018 – Oct 20191 yr 3 mosRemote

    Managed social media profiles, planned monthly content calendars (images, videos and copy), and planned and ran Facebook and Instagram ad campaigns.

  • O/

    IT Specialist

    Ovoko / RRR.LTFull-time
    Jun 2017 – Apr 201811 mosOn-site

    E-commerce platform and marketplace integration at RRR.lt, an auto aftermarket e-commerce platform.

See Mantas’s full profile

Industries, more reviews and certifications are visible to members.

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  • AutomotiveMarketing & AdvertisingMedia & EntertainmentIndustries6 industries

At a glance

Available for workReach out to talk about a project
Location
Lithuania
Services posted
12
Rating
No reviews yet
Member since
12 Nov 2026

Skills 16

The skills this member works with.

  • Shopify Development
  • UX / UI DesignExpert · 10 years
  • Business Process Automation
  • E-commerceExpert · 10 years
  • Performance Optimization
  • Technical SEO

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