Marta Kosmalska

Product Lead - Supply & Category Expansion @Vinted

Berlin, DE

Owning category expansion & markets strategy across marketplace. Accountable for GMV growth, operational readiness, and platform stability across multiple markets- Orchestrated US market entry for categories, aligning product, legal, trust & safety, and program teams to ensure regulatory compliance and scalable operations- Led critical incident recovery in the UK market, making rapid trade-offs across supply controls, UX, and growth velocity to stabilize operations ahead of international rollout- Defined and led a 9-month category expansion strategy with explicit GMV targets, investment priorities, and market sequencing across supply verticals- Drove navigation and discovery experiments that improved category sell-through rates by +0.5 – 1.7%, directly contributing to GMV uplift- Steered cross-domain alignment with 10 teams on a strategic “Sizing” initiative, improving category conversion- Acted as a single product interface to Legal, absorbing regulatory and compliance requests to protect delivery focus across 5 supply teams- Mentored and up-leveled 2 Product Managers, enabling independent ownership of complex problem spaces, including Listing AI and Price Suggester.Role concluded following a company-wide strategic pivot and centralization of category expansion to HQ.

Freie Universität Berlin

GFPS scholarship exchange program

Teacher Training College in Wroclaw

Bachelor of Arts (B.A.), Methodology and Didactics, Teaching Foreign Languages

University of Wroclaw

Bachelor of Arts (B.A.), English and Russian Linguistics Studies

University of Wroclaw

Master of Arts (MA), English Philology, Translation Studies