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Senior Machine Learning Engineer, Menu Personalization
AI / ML Engineer
• Senior
• Vor Ort
• Vollzeit
• 📍 Warszawa
HelloFresh's HelloTech organisation in Warsaw is looking for a Senior Machine Learning Engineer for the Menu Personalization team to build and operate the recommender stack running in production. You will design, build and operate ML systems across feature pipelines, training workflows, model serving, experimentation tooling and infrastructure, holding end-to-end accountability for significant parts of the stack that determine what millions of customers see each week.
Responsibilities
- ▹Build and operate the ML systems behind menu personalization, working hands-on across feature pipelines, training workflows, model serving, experimentation tooling and infrastructure.
- ▹Transition research and experiments into reliable production systems that meet real latency, scalability and observability requirements, partnering with Data Scientists.
- ▹Maintain accountability for significant components of the recommender stack, from design through deployment and ongoing operation.
- ▹Instrument and improve systems in production to ensure continuous refinement based on real-world performance.
- ▹Contribute to the personalization roadmap with Product and Engineering, backing technical directions with data and user evidence.
- ▹Raise the technical bar on the team through thorough code and design reviews, technical guidance and setting an example for production ML craft.
Requirements
- ▹5+ years of experience building and operating production ML systems.
- ▹Fluency across the data and ML stack (Python, Spark) and working knowledge of 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 the judgment to evaluate model metrics accurately.
- ▹Operational judgment to diagnose system misbehavior under real load, identify root causes and deploy robust fixes.
- ▹Hands-on experience with AI tooling (Claude Code, Cursor, Copilot) as part of a regular workflow, with a practical sense of how context engineering shapes output quality.
- ▹Product sense to translate technical initiatives into business value.
- ▹A bias to ship, maintaining full accountability to finish the final implementation phases of a project.
Nice to have
- ▹Production experience with recommender systems or large-scale personalization.
Soft skills
Product sense and an analytical viewpoint on what should be built and why.A bias to ship with full accountability.Cross-functional collaboration with Data Scientists, Backend Engineers and Product.Technical leadership and mentorship through reviews.
What we offer
- ▹Global collaboration with experienced engineers and product partners across HelloTech's international teams, in a culture of active knowledge sharing.
- ▹Build and operate modern systems at global scale, supporting 6+ million customers and complex supply chain operations.
- ▹Technical, product and design leadership opportunities in an autonomous, product-led setup.
- ▹End-to-end development and delivery ownership, from problem definition to production.
- ▹Access to workspace at Warsaw Centre Point with modern facilities (showers, breakout zones, outdoor space, cycle parking and refreshments).
About the company
HelloTech is HelloFresh's global technology backbone of more than 1,000 people, building the digital products that power the company's end-to-end food experience, from customer-facing apps and personalization to pricing, forecasting and supply chain optimization.