Portfolio & Case Studies โ€” Md Shariar Hossain | Klaviyo Email Marketing
Limited slots: Accepting 3 new Shopify clients in May 2026 โ€” book a free audit before they're gone

Real results from real Shopify stores

Detailed case studies with actual revenue numbers โ€” plus 20 email designs from real client projects. This is the work, not just talk.

$500K+
Email Revenue Generated
30+
Shopify Stores Helped
92%
Avg Inbox Placement
5
Countries Served
Detailed Case Studies

More wins from real Shopify stores

Each case below shows the exact problem, my solution, and the measurable results โ€” so you know what to expect.

01

Health & Beauty Brand โ€” Deliverability Rescue

Texas, USA ยท Shopify ยท US USA
The Problem

Their open rates had crashed from 28% to 8% over six months. Most emails were landing in spam. SPF and DKIM were misconfigured, their sender reputation had tanked, and they were losing thousands in monthly revenue. They were considering shutting down email altogether.

My Solution

I conducted a full deliverability audit, fixed SPF/DKIM/DMARC records, ran a 14-day domain warm-up, cleaned 12,000+ inactive subscribers from the list, and rebuilt their sender reputation with engaged audiences first. I also rewrote their sending strategy to prioritize high-engagement segments.

The Results (in 6 weeks)
60% โ†’ 92% Inbox placement rate
+247% Open rate recovery
$0.04 โ†’ $1.85 Revenue per recipient
~0% Spam complaint rate
Klaviyo DNS / SPF / DKIM List Cleaning Reputation Repair
"Our inbox placement went from terrible to excellent after Shariar audited our DNS setup and rewrote our sending strategy. The difference in open rates was immediate and significant." โ€” Marketing Lead, Health & Beauty Brand
02

Home Goods Store โ€” Welcome & VIP Flow Rebuild

New York, USA ยท Shopify Plus ยท US USA
The Problem

Strong first-time buyers but customers rarely came back. Their welcome flow was a single thank-you email, and they had no VIP recognition for top spenders. CLV was stuck at $87 โ€” far below their $200 industry benchmark. They were losing 70% of customers after the first purchase.

My Solution

Built a 5-email welcome series that educated new subscribers on the brand story, plus a 4-email VIP flow triggered by repeat purchase behavior. Set up RFM segmentation to identify high-value customers automatically. Added personalized product recommendations based on past orders.

The Results (in 60 days)
+22% Repeat purchase rate
$87 โ†’ $164 Customer LTV
+89% Email-attributed revenue
38% Welcome flow conversion
Klaviyo Shopify Plus RFM Segmentation VIP Flow
03

Sustainable Apparel Brand โ€” Full Klaviyo + SMS Setup

London, UK ยท Shopify ยท UK UK
The Problem

A growing UK apparel brand was running on Mailchimp basic templates, no flows, no SMS. They had a 18,000-person email list but were only sending occasional newsletter blasts. Cart abandonment was high (76%) and they had no way to recover lost sales automatically.

My Solution

Migrated their entire email program from Mailchimp to Klaviyo. Built 5 core flows (Welcome, Cart, Browse, Post-Purchase, Win-Back) with brand-matched designs from Figma. Set up SMS via Postscript with cart abandonment + new launch flows. Created 4 advanced segments for targeting.

The Results (in 90 days)
31% Email + SMS revenue share
+41% Cart recovery rate
ยฃ18K/mo New email + SMS revenue
2.4x ROI in first quarter
Klaviyo Postscript SMS Figma Design Mailchimp Migration
"Shariar delivered exactly what he promised โ€” a clean Klaviyo setup, great templates, and a segmentation strategy that makes sense for our audience. Will work with him again." โ€” Marketing Executive, Sustainable Apparel Brand ยท UK
04

Supplement Brand โ€” Subscription Retention Engine

Amsterdam, Netherlands ยท Shopify + ReCharge ยท NL Netherlands
The Problem

A subscription-based supplement brand had high subscription churn โ€” 38% of customers cancelled within 90 days. They had no replenishment reminders, no education flows, and no win-back automation for lapsed subscribers. Each lost subscriber cost them ~$420 in lifetime value.

My Solution

Designed a complete retention system: replenishment reminder flow (3 emails), education series with product usage tips, churn prevention flow triggered by subscription pauses, and a 5-email win-back sequence for cancelled subscribers. Integrated all flows with ReCharge subscription data.

The Results (in 4 months)
38% โ†’ 19% Subscription churn
+$340 Avg subscriber LTV
23% Win-back conversion
โ‚ฌ32K/mo Retained revenue
Klaviyo ReCharge Win-Back Flow Replenishment
05

Specialty Coffee Brand โ€” From Zero Email Setup to $14K/mo

Melbourne, Australia ยท Shopify ยท AU Australia
The Problem

A new specialty coffee Shopify brand launched 4 months earlier with zero email infrastructure. They had 2,400 subscribers from a popup but no welcome flow, no abandoned cart, no segmentation. They were leaving an estimated $10K+ on the table every month from missed email opportunities.

My Solution

Built their entire Klaviyo program from scratch over 3 weeks: 3 core flows (Welcome, Cart, Post-Purchase), 8 monthly campaign templates with brand-matched coffee photography, advanced segmentation by roast preference, and a list-growth popup that converted 4.2% of visitors.

The Results (in 5 months)
$0 โ†’ $14K/mo Email revenue
2,400 โ†’ 8,900 Email subscribers
28% Email revenue share
42% Avg open rate
Klaviyo Shopify Figma Design Coffee/F&B Popup Optimization
Industries

Niches I've worked with

Diverse experience across Shopify verticals โ€” each with their own retention dynamics.

Pet Care
Grooming, food, supplies
Health & Beauty
Skincare, wellness, makeup
Apparel
Fashion, sustainable wear
Home Goods
Decor, furniture, kitchen
Supplements
Subscription, vitamins
Food & Beverage
Coffee, snacks, gourmet

Want to be the next case study?

Book a free 30-minute audit. I'll review your store, your current email setup, and tell you exactly what's leaving money on the table โ€” no pressure, just a clear plan.