Swell

A boutique growth team based in Berlin, Swell works as an international growth partner for scale-ups and established teams expanding into new markets, with a particular focus on e-commerce, fintech and select media and consumer brands. Case material references a US-based DTC brand at scale, indicating experience with larger, fast-growing clients as well as smaller organisations. Each client is assigned a senior-led team, with some members having backgrounds as Amazon and eBay operators, rather than a single generalist account handler. The agency's work spans acquisition and conversion. On the acquisition side, it manages paid media across Google, Meta and affiliate channels, alongside owned media through email and SEO/GEO, and produces creative assets informed by performance data. On the conversion side, it runs CRO experiments across key pages, conducts UX research to identify where users drop off in the funnel, and adapts offer, messaging and channel choice to local market realities. Its stated method centres on structured testing frameworks and growth loops rather than one-off recommendations, combining insights across the funnel to identify and prioritise growth levers already present within a client's business. Swell also describes a "growth culture" approach, training internal client teams to run experiments and base decisions on data, alongside publishing a recurring newsletter covering growth marketing frameworks and models.