Senior Data Scientist, Growth Alliance (m/f/d) at Hellofresh

Hellofresh

Warszawa, Masovian Voivodeship, Poland·5h ago

SeniorFull-timeRailsMachine LearningData ScienceGitML

Salary Range

$46,410 - $62,790 /year

Estimated

This salary is estimated based on similar roles. The actual salary may vary.

About the Role

We are looking for a Senior Data Scientist to join HelloFresh's HelloTech organization in Warsaw. This role focuses on building and iterating on machine learning models that power personalization for high-traffic conversion pages.

Key Responsibilities

→Build and iterate on machine learning models powering personalization that run in production behind high-traffic, performance-critical conversion pages.
→Execute decisioning models that determine the best next step in the conversion funnel for each user.
→Contribute to system design by coordinating with Engineering to ensure data science solutions integrate cleanly into the overall funnel architecture.
→Coordinate directly with Product and Engineering to shape how ML-driven decisions are embedded into the conversion funnels.
→Direct experimentation design for decisioning models, defining success metrics, guardrails, and how results are interpreted in high-noise, high-traffic 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 techniques such as 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 with operating in production environments and collaborating closely with engineers.
✓Clear, structured communication skills and a collaborative mindset.

Benefits

★Global collaboration at scale: Collaborate with experienced engineers and product partners across HelloTech’s international teams.
★Technology with real-world impact: Build and operate modern systems at global scale, supporting 6+ millions of customers.
★Technical/Product/Design leadership: Drive best practices and influence architecture/design, quality, and ways of working.
★End-to-end development/delivery: Drive decisions from problem definition to production.
★Access to workspace at Warsaw Centre Point with modern facilities.