Senior Data Scientist - Personalization & Predictions

<div class="content-intro"><div class="p-rich_text_section">Bloomreach is building the world’s premier <strong data-stringify-type="bold">agentic platform for personalization</strong>.We’re revolutionizing how businesses connect with their customers, building and deploying AI agents to personalize the <strong data-stringify-type="bold"><em data-stringify-type="italic">entire</em></strong> customer journey.</div> <ul class="p-rich_text_list p-rich_text_list__bullet p-rich_text_list--nested" data-stringify-type="unordered-list" data-list-tree="true" data-indent="0" data-border="0"> <li data-stringify-indent="0" data-stringify-border="0">We're taking <strong data-stringify-type="bold">autonomous search</strong> mainstream, making product discovery more intuitive and conversational for customers, and more profitable for businesses.</li> <li data-stringify-indent="0" data-stringify-border="0">We’re making <strong data-stringify-type="bold">conversational shopping</strong> a reality, connecting every shopper with tailored guidance and product expertise — available on demand, at every touchpoint in their journey.</li> <li data-stringify-indent="0" data-stringify-border="0">We're designing the future of <strong data-stringify-type="bold">autonomous marketing</strong>, taking the work out of workflows, and reclaiming the creative, strategic, and customer-first work marketers were always meant to do.</li> </ul> <div class="p-rich_text_section">And we're building all of that on the intelligence of a single AI engine — <strong data-stringify-type="bold">Loomi </strong>— so that personalization isn't only autonomous…it's also consistent.From retail to financial services, hospitality to gaming, businesses use Bloomreach to drive higher growth and lasting loyalty. We power personalization for more than 1,400 global brands, including American Eagle, Sonepar, and Pandora.</div></div><p>You'd be joining the <strong>Artificial Intelligence team</strong>. We own the algorithmic core of the platform: Predictions, Contextual Personalization, contextual bandits, autosegmentation, and the agentic workflows behind Loomi. We work with behavioural data at terabyte scale, across 1,400+ customers, in production, every day. We are currently allowing flexibility for our employees to work from anywhere for the respective region <strong>(Central & Eastern Europe) </strong>or we are happy to <strong>meet you in our offices in Bratislava (Slovakia) or Brno, Prague (Czechia) on a full-time basis.</strong></p> <h3>The mission</h3> <p><strong>You find the signal in how 1,400 brands' customers actually behave — and you prove it moved a business metric.</strong> Your models decide which customers are predicted to churn, which segments form themselves, which offer a shopper sees, and whether the discount changed anything or was going to convert anyway.</p> <h3>What you'll actually do</h3> <ul> <li><strong>Frame the problem before modelling it.</strong> Most of our highest-impact work arrives as a vague business question, and turning it into something measurable is the first job.</li> <li><strong>Work the data at scale.</strong> Behavioural data, product catalogues and event streams across BigQuery and Databricks — finding features that carry real predictive signal, not the ones that are easy to compute.</li> <li><strong>Build and evaluate models</strong> across Predictions and Contextual Personalization: propensity and churn, contextual bandits, autosegmentation, uplift and incrementality.</li> <li><strong>Design the evaluation, not just the model.</strong>