Ready to use Strategies every Thursday

Top 1% eCommerce Retention Agency

Retention
Side

RETENTION TEAM for ecommerce brands

Instead of more campaigns and discounts, we build retention systems that drive repeat buying and sustainable growth.

Core team roles

Our teams operate in dedicated PODs designed for depth, not scale. Each POD supports no more than five clients to preserve execution quality, ownership, and long-term accountability.

Client Success

Client Success

Leads the engagement end to end, holding full strategic ownership. This role is your main point of touch. Understands the entire eCommerce system beyond retention, connects all moving parts, and directs the POD. Decisions are made based on data, experience, and long-term business impact.

Klaviyo Specialist

Klaviyo Specialist

Designs the technical foundation behind retention performance, guiding tool selection and system setup to support scale. By setting clear filters and managing frequency, this role protects the customer experience and prevents over-communication. It translates strategic intent into tangible structure.

Graphic Designer

Graphic Designer

Has a deep understanding of the visual aspect for retention channels in eCommerce. Balances brand guidelines with structures that drive attention, clarity, and action across devices and viewing modes. It translates strategy into visuals built for engagement and conversion.

Copywriter

Copywriter

Understands how to connect with customer emotion and intent in the eCommerce industry. Experienced in researching action drivers across different audience segments to shape messaging direction. It puts the cherry on top by completing the final layer of front-end work.

QA Tester

QA Tester

Eliminates all errors caused by human oversight through systematic review and validation. Ensures every execution meets defined standards before launch, and it serves as the final control layer protecting quality, performance, and customer experience.

process built
around the outcome

We design our process around defined goals to ensure every decision is deliberate. Structure replaces assumptions, reducing risk and protecting performance over time.

Foundational Research
We start by understanding the brand, customers, and retention landscape before any execution begins. This phase focuses on uncovering behavioral patterns, gaps, and opportunities that directly influence long-term retention performance.
Optimization Workshops
Workshops are structured working sessions designed to turn insights into clear, actionable improvements. Together, we prioritize what to fix, test, and optimize based on impact rather than assumptions or preferences.
Retention Strategy Design
Strategy design connects research and execution into a clear retention roadmap. Every decision is aligned with business goals, customer behavior, and measurable retention metrics to ensure the strategy is built to perform.
Controlled A/B Framework
All experiments are run within a controlled framework that isolates variables and produces reliable results. This approach allows us to validate ideas, reduce risk, and scale only what has been proven to work.
Behavioral Data Analysis
We continuously analyze customer behavior across channels to identify trends, friction points, and growth opportunities. Data is used to inform decisions, refine strategy, and improve performance over time.

our core
Values

True Integration

We operate as an extension of your marketing team, aligning with all channels to ensure retention efforts never exist in isolation.

Radical Transparency

All work, priorities, and progress are visible through our Notion Client Portal, supported by daily Slack communication and weekly reviews.

Deep Ownership

We immerse ourselves in each client’s business, building context around challenges and opportunities to advise with confidence.

Honest Direction

We don’t optimize for comfort or agreement, we optimize for outcomes, explaining and standing behind the better path when needed.

Data-Led

All decisions are grounded in data, not preference or assumption, using evidence and measurable signals to guide direction.

Continuity

We build systems meant to hold under growth, change, and pressure—not just during ideal conditions.

Marko Mandic, Founder of Retention Side eCom Email Marketing Agency

Marko Mandic 

Founder

Retention Club was built in response to inefficiency, when acquisition outpaced the systems designed to retain customers.

Today, we operate as a retention-driven agency built on structure, accountability, and measurable outcomes.

Our focus remains unchanged: helping eCommerce brands grow profitably by mastering what happens after the first purchase.

Marko Mandic, Founder of Retention Side, Retention Marketing eCommerce Agency

Join us

Every Thursday, we share a strategy or insight we’ve discovered while working with top 1% eCommerce brands. Some sell this knowledge through courses, others lock it behind monthly retainers, and some don’t even know it exists. We share it for free, every week.

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Practical retention strategies we implement for our clients, shared weekly!

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