Sestimi.pl is a fast-growing fashion retailer that has built its long-term growth and expansion strategy on marketplace platforms. Sales are generated through strategically selected online marketplaces across Europe, with a portfolio of tens of thousands of products.
With a broad assortment and multiple markets comes complexity: competitive price changes, different types of discount campaigns, varying promotional conditions, the need to manage advertising efficiently, and at the same time stay within defined margins and internal strategy.
This brings a reality that all large-scale marketplace sellers know well:
Yet all decisions must fit into one internal strategy, respect margins, budgets, and target profitability – on a daily basis.
Sestimi knew exactly what it wanted to do on marketplaces.
It had clearly defined pricing policies, discount rules, and advertising budgets.
The real issue was not the decisions themselves – it was their volume and frequency.
As the number of products, markets, and marketplace activities grew, it became necessary every day to:
Every decision – whether reacting to competitors, joining a discount campaign, or investing in promotion – had to be made in the context of internal rules such as margins, budgets, and acceptable selling costs.
Remaining consistently active and competitive on marketplaces such as Allegro and Kaufland is demanding in itself.
Sestimi was already using integration platforms.
They helped with the technical side of selling – listings, orders, basic automation.
But they did not address the key question:
Without a system capable of taking over this decision-making burden, part of the marketplace sales potential remained untapped.
Not because data or strategy were missing, but because there was no capacity to execute them in practice.
Sestimi therefore deployed Merchantee not as another tool, but as an agentic marketplace specialist – a software layer that connects decision-making with automated execution.
Instead of manually controlling individual actions, Sestimi defined in Merchantee:
The strategy remained in Sestimi’s hands. Execution and daily decision-making shifted to Merchantee.
The biggest impact on growth came from automated discount campaigns.
Sestimi uploaded so-called campaign limits into Merchantee – the lowest prices at which it was willing to include products in campaigns such as Allegro Days or Black Week.
Merchantee then:
Between October and December 2025, Merchantee:
Hundreds of products were automatically included in campaigns where it made sense.
Thousands more were blocked to prevent margin strategy violations.
No manual work. No team expansion.
Dynamic pricing was also part of the agentic approach and:
Merchantee updated inputs multiple times per day and monitored competitor prices several times per hour.
Based on defined rules, it decided whether to:
The additional margin generated by price increases was pure profit – without a negative impact on sales volume.
High-conversion products worth actively promoting.
Products with high interest but low sales. Removing them from PPC led to immediate cost savings with no revenue impact.
Products with minimal interaction, suitable for visibility testing or listing optimization.
Thanks to this segmentation, Sestimi invested PPC budgets where they delivered the highest business impact.
Already within the first month after launching key features, Sestimi recorded: