Lead Backend Engineer

Hybrid | Hamburg or Berlin, Germany | Experienced

* Jobs

* Lead Backend Engineer - Personalization (all genders) – Hamburg or Berlin, Germany

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* 7+ years of experience building scalable backend systems and APIs, with a strong track record of taking technical ownership * Practical and recent experience with a typed programming language, ideally Node.js/TypeScript, or a strong background in Java, Go or Kotlin * Deep understanding of backend architecture, distributed systems, APIs, data stores and performance optimization * Strong algorithmic and analytical thinking, with an interest in search, recommendations, ranking or personalization problems * Experience working at the intersection of backend engineering and ML, for example by serving model scores, embeddings or ML-driven features in production * You care deeply about code quality and maintainability and actively drive technical improvements beyond your immediate area of responsibility * You are comfortable making architectural decisions, challenging existing approaches and establishing engineering standards across team boundaries * Strong communication skills in English and the ability to collaborate effectively with engineers, data experts and product stakeholders * You enjoy taking ownership, sharing knowledge and enabling other engineers to grow

* A strong technical background in Search, Recommender Systems, Ranking or Personalization * Hands-on experience with Elasticsearch/OpenSearch, Redis/Valkey, high-throughput APIs or other performance-critical backend systems * Familiarity with ML-powered systems, LLMs, embeddings, vector search or Learning-to-Rank approaches * Experience in operating large-scale systems with strict latency and availability requirements * Exposure to cloud ecosystems such as AWS or GCP and data platforms including BigQuery, dbt or Dagster * A background in e-commerce, search, recommendations, advertising or other domains where relevance and personalization directly impact the customer experience

from 85k €

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A Place Where You Can Be You

We take it as our responsibility to create an environment where everyone feels welcome, exactly as they are. Different backgrounds and perspectives make us stronger and shape our culture in ways that matter. What we stand for internally, we stand for as a brand: acceptance, inclusion, and a fairer approach to fashion.