Overview

About Bossar

Bossar is a specialized eCommerce email marketing agency focused on email and SMS. With 5+ years of experience and a proven track record across 100+ stores, we focus exclusively on retention marketing that drives measurable results.

Most of the brands we work with are established eCommerce businesses, and the majority of our clients operate in the 6- to 8-figure revenue range. This focus allows us to craft strategies built for scale, helping growth-minded brands unlock the full potential of email and SMS. Our longest-standing client has been with us for over 4 years, proof that our strategies create growth that lasts.

As a full-service email marketing agency, our core offer is done-for-you email & SMS management, which covers every aspect of retention marketing, including:

✔️ Automated email & SMS flows tailored to your brand and customer journey
✔️ Campaign planning, execution, and optimization
✔️ Audience segmentation and advanced personalization
✔️ Custom design + conversion-driven copywriting
✔️ Deliverability monitoring and inbox placement
✔️ A/B testing and performance optimization
✔️ Detailed reporting and actionable insights

If your store is under $50K/month in sales or you’re not ready for ongoing monthly management, we also offer one-time flow setups and custom projects designed to match your tech stack and business needs. Whether you need a dedicated Klaviyo email marketing agency or support with another ESP, our team builds flows and campaigns tailored to your system.

With Bossar, you’re not hiring a generic provider, you’re partnering with a retention-focused email marketing agency that lives and breathes email & SMS, turning them into your most profitable growth channels.

Want to identify missed revenue opportunities in your retention marketing? Visit our website and apply for a free audit here: https://bossar.agency/free-audit (no obligations) to get actionable insights tailored to your store.

What clients say

Review Analytics of Bossar

Every review is verified through Goodfirms before it's published.

5.05 Verified Reviews
Quality5.0
Schedule & Timing5.0
Communication5.0
Overall5.0
Review Summary
Summarized from 5 verified reviews · Updated August 2026
Clients consistently praise Bossar's design expertise and professional service delivery. The team is noted for clear communication, attention to detail, and reliable adherence to timelines and project specifications. Shopify expertise and quality of work are highlighted as standout strengths. Reviewers characterize the company as easy to work with and producing results that meet expectations.
✦ AI-generated summary. May not reflect every review.
Detailed Reviews of Bossar
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What reviewers mention most

Paras RaichuraVerified Review
Posted on Jul 3, 2020

“Excellent Company ”

Overall rating5.0
Quality5.0
Communication5.0
Schedule & Timing5.0
Digital MarketingEmail Marketing

Sergey and his team are great! They are results driven and have made a big impact to our e-commerce clients and email marketing. They’ve helped scale some of our clients to over 40% additional revenue. Highly recommend!

ShawnVerified Review
Posted on Mar 25, 2020

“Amazing Work”

Overall rating5.0
Quality5.0
Communication5.0
Schedule & Timing5.0
Digital MarketingWeb DevelopmentSocial Media MarketingEmail MarketingConversion Rate Optimization

I had an amazing experience working with this firm. They were fast, professional, detailed, and super patient with me. They were able to hold my hand during the process. Definitely will work with Bossar again.

Tobias Külper
Tobias Külper, Founder & COO at brandions GmbHVerified Review
Posted on Mar 22, 2019

“Awesome Shopify experts”

Overall rating5.0
Quality5.0
Communication5.0
Schedule & Timing5.0
E-commerce Development

We've worked with Bossar to create our Shopify store and they are awesome experts on this field. They've developed an ultra fast and great store for us and documented & explained every function well with tutorial videos.

Hugo Cardinale
Hugo Cardinale, President/CEO at LeadBurst Marketing, LLCVerified Review
Posted on Mar 19, 2019

“Excellent Work”

Overall rating5.0
Quality5.0
Communication5.0
Schedule & Timing5.0
Web Design

We provided a mock and scope of the design we needed. They delivered a perfect design of the pages exactly as we wanted them. Communication was excellent. Very talented team. We will work with them again.

Neville Woller
Neville Woller, Cofounder at ZudelloVerified Review
Posted on Feb 25, 2019

“The best design firm we have worked with”

Overall rating5.0
Quality5.0
Communication5.0
Schedule & Timing5.0
E-commerce DevelopmentWeb Design

The team works hard and provides an exceptional product. I'm continually amazed at what they are able to design and develop, whether it be one of the many Shopify stores we have done for them or a Saas website. I am a perfectionist and often have multiple revisions, which they have implemented without any fuss. I highly recommend the Bossar design team.

Focus

Service Focus of Bossar

How the team's effort is distributed across services.

100%

Industries Focus

100%

Client Focus

Small Business50%
Medium Business50%
Selected Work

Client Portfolio of Bossar

Where their work concentrates - by industry, budget, and timeline.

Clients: 8

CupidsTentBoxGymproluxeTheraPetMDAirmotoThe Case ClubGalaxateMagische Pfoten

Where we are

Locations (1)

Offices where Bossar operates.

Headquarter
Poland

Poland

Anny German
Warsaw, Masovian Voivodeship 01794