Senior Data Scientist, Growth Alliance (m/f/d)
A senior data science role within the Conversions Tech area of the Growth Alliance at HelloTech in Warsaw. The Conversions area enables meal brands to hit growth targets through a seamless, high-performing conversion funnel, powering marketing with advanced MarTech and product innovation focused on (re)acquisition, conversion optimization and data-driven growth. The data scientist shapes the intelligence that drives customized user journeys, building and running machine learning models in production behind high-traffic, performance-critical conversion pages.
Stack
Responsibilities
- ▹Build and iterate on machine learning models powering personalization in production behind high-traffic conversion pages
- ▹Execute decisioning models that determine the best next step in the conversion funnel for each user
- ▹Contribute to system design and coordinate with Engineering so data science solutions integrate cleanly into the funnel architecture
- ▹Shape how ML-driven decisions are embedded into conversion funnels, including where models decide and how failures are handled
- ▹Direct experimentation design, defining success metrics, guardrails and result interpretation in high-noise environments
- ▹Maintain model safety and effectiveness in production by monitoring performance, input data reliability and latency
Requirements
- ▹5+ years of professional experience in data science or a related quantitative field
- ▹Strong foundation in machine learning concepts relevant to personalization and marketing communications
- ▹Hands-on experience with regression, classification, clustering, recommendation systems and experimentation
- ▹Practical experience designing and analyzing A/B tests and controlled experiments
- ▹Experience working with customer behavior data and segmentation
- ▹Extensive experience operating in production environments and collaborating with engineers
- ▹Clear, structured communication skills and a collaborative mindset
Soft skills
What we offer
- ▹Global collaboration with experienced engineers and product partners across international teams
- ▹Building and operating modern systems at global scale for 6+ million customers
- ▹Technical, product and design leadership in an autonomous, product-led setup
- ▹End-to-end development and delivery ownership
- ▹Access to the Warsaw Centre Point workspace with showers, breakout zones, outdoor space, cycle parking and refreshments
About the company
HelloTech is HelloFresh's global technology backbone with more than 1000 people, building the digital products that power an end-to-end food experience across a subscription-based, direct-to-consumer model.