Senior Backend Engineer - Python and/or Go

At HelloFresh, the goal is to change the way people eat forever by delivering high-quality food across 18 countries and 3 continents. As a global food solutions group and the world's leading meal kit provider, the portfolio includes HelloFresh, Green Chef, EveryPlate, Chefs Plate, Factor_, and Youfoodz. Engaging with HelloFresh in Warsaw means collaborating with HelloTech—a global technology division of over 1,000 people powering an end-to-end food ecosystem. From digital personalization and forecasting to supply chain optimization and food waste reduction, technology drives every step of this direct-to-consumer model. About the Role: What's in the Box HelloTech operates in autonomous, cross-functional alliances, each holding accountability for a specific product domain end to end. The service provider will join an assigned squad, with the flexibility to transition between teams and projects as technical objectives and business priorities evolve. Several technical domains are actively engaging providers. Projects will be aligned based on individual strengths and expertise during the process. Key technical domains include: Marketing Customer Profile squad: Builds AI-powered backend systems that automate campaign execution end-to-end, from content generation and validation to multi-channel delivery across email, SMS, and push. Conversions Tribe: supporting the "Reachable Audience" and Personalization initiatives. The mission is to build the systems that power customized user jo