4+ years of hands-on experience (PhD research counts), with a track record building marketing mix or advertising response models that moved real budgets - in-house at a consumer, fintech or app business, or at a measurement company (Recast, Haus, PyMC Labs, Google, Meta or similar) - with results you can explain and evidence. We're making a founding hire: a Staff Data Scientist in Marketing Science to own the mathematics behind our paid growth - the causal measurement, the response curves, the customer-value models and the optimisation that decide where our multi-million-dollar, always-on acquisition budget goes across Google, Apple Search Ads, OpenAI ads, Meta, TikTok and X.