Senior Data Scientist — Growth & Personalization

Joinimagine

Województwo mazowieckie

On-site

PLN 180,000 - 280,000

Full time

14 days+
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Benefits offered by this job

Workspace in Warsaw Centre Point
Global collaboration across HelloTech

Job summary

HelloFresh in Warsaw, within HelloTech, is seeking a Senior Data Scientist to drive ML-powered personalization across conversion funnels and support data-driven growth for a global customer base.

You will partner with Product and Engineering to design, implement, and evaluate ML models, ensuring safe and scalable delivery in a high-traffic environment. This role emphasizes collaboration and impact across international teams.

Qualifications

  • 5+ years of professional experience in data science or a related quantitative field.
  • Strong foundation in machine learning concepts relevant to personalization and marketing.
  • Hands-on experience with regression, classification, clustering, recommendation systems, and experimentation.
  • 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.

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 into the funnel architecture.
  • Coordinate with Product and Engineering to embed ML-driven decisions into the conversion funnels, including where models decide and how failures are handled.
  • Direct experimentation design for decisioning models, defining success metrics, guardrails, and interpretation in high-noise environments.
  • Maintain model safety and effectiveness in production by monitoring performance, data reliability, and latency.

Skills

Data science
ML for personalization
A/B testing
Production ML
Cross-functional collaboration
Communication

Tools

Python
SQL
ML frameworks

Job description

HelloFresh in Warsaw, within HelloTech, is seeking a Senior Data Scientist to drive ML-powered personalization across conversion funnels and support data-driven growth for a global customer base.

You will partner with Product and Engineering to design, implement, and evaluate ML models, ensuring safe and scalable delivery in a high-traffic environment. This role emphasizes collaboration and impact across international teams.

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