Backend Engineer - Recommendation

Hybrid | Hamburg or Berlin, Germany | Experienced

* Jobs

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

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* You take end-to-end responsibility for our recommendation engine and love seeing your changes directly impact customer engagement * 3+ years of experience building high-throughput backend services (Node.js/TypeScript preferred, or fast-converting from Java, Go, or Kotlin) * Real depth in Redis/Valkey data modeling, caching hierarchies (multi-tier, TTLs/invalidation), and binary payloads (Protobuf/Avro) * High-throughput mindset: comfortable operating APIs that scale to 10k+ rps under strict latency SLOs * You're excited to bridge backend engineering and ML by serving model scores, embeddings, or LLM features in live systems * Clear communication skills in English and a data-driven, experiment-friendly mindset

* RecSys fundamentals (collaborative filtering, matrix factorization, cold-start handling, diversity algorithms) * Streaming GenAI / LLM product experience (chat UX, prompt caching, guardrails) * Experience with AWS serverless (DynamoDB modeling, SQS/SNS) and OpenSearch k-NN indices * Performance profiling (clinic.js, flamegraphs) and load testing (k6)

60k - 70k €

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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.