Senior Staff Machine Learning Engineer, Menu Personalisation
HelloFresh, the world's leading meal kit company, is looking for a technical leader for its Menu Personalization ML systems in Warsaw. You will own the production recommender stack that decides what millions of customers see each week, setting the direction for how the ML systems are designed, built, and operated while staying hands-on across feature pipelines, training workflows, model serving, and infrastructure. The role carries influence well beyond the team through the standards, architecture, and company-wide initiatives you drive.
Responsibilities
- ▹Set the technical direction for the ML systems behind menu personalization, owning the end-to-end stack: feature pipelines, training workflows, model serving, experimentation tooling, and infrastructure
- ▹Take research and experiments to reliable production systems, partnering with Data Scientists on services meeting real latency, scalability, and observability requirements
- ▹Shape the personalization roadmap with Product and Engineering leadership, backing your point of view with data and user evidence
- ▹Operate what you build, instrumenting and improving systems in production
- ▹Raise the technical bar through architecture reviews, mentorship, and example
- ▹Shape long-term architecture and make platform decisions whose payoff plays out over years
- ▹Drive engineering excellence beyond Menu Personalization by setting standards other teams adopt
- ▹Contribute to company-wide engineering initiatives advancing ML and data craft
Requirements
- ▹8+ years building and operating production ML systems with a track record of technical leadership at scale
- ▹Architectural decisions in your past that held up over multiple years and influenced teams beyond your own
- ▹Fluency across the data and ML stack (Python, Spark) and the backend and platform stack (Go, Kafka, Kubernetes)
- ▹Hands-on experience across pipelines, model serving, and observability at scale
- ▹Statistical literacy to design honest experiments and judgment to know when a model is actually better
- ▹Operational judgment to diagnose system misbehavior, find root causes, and ship debuggable systems
- ▹Hands-on experience with AI tooling (Claude Code, Cursor, Copilot) as a daily working practice
- ▹Product sense and a bias to ship, taking full ownership and finishing the last twenty percent
Nice to have
- ▹Production experience with recommender systems or large-scale personalization
Soft skills
What we offer
- ▹Global collaboration at scale across HelloTech's 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 ownership from problem definition to production
- ▹Access to workspace at Warsaw Centre Point with showers, breakout zones, outdoor space, cycle parking, and refreshments
About the company
HelloFresh is a global food solutions group and the world's leading meal kit company, active in 18 countries across 3 continents, with brands including Green Chef, EveryPlate, Chefs Plate, Factor_, YouFoodz, The Pets Table, and GoodChop. Its HelloTech organization is the global technology backbone.