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ABOUT YOU

E-commerce fashion retailer offering personalized recommendations

Backend Engineer - Recommendation

Backend EngineeringConfirmed live in the last 24 hours
Full-time€60k - €70k /yrHybrid

About the Job

Requirements

  • At least 3 years of experience developing high-performance backend services, ideally with Node.js and TypeScript, or alternatively with Java, Go, or Kotlin.
  • Practical experience with Redis or Valkey data modeling, multi-level caching architectures including time-to-live settings and invalidation, and binary data formats such as Protocol Buffers or Avro.
  • Understanding of high-throughput systems and experience building APIs that scale to more than 10,000 requests per second under strict latency service-level objectives.
  • Interest in combining backend engineering and machine learning by deploying model scores, embeddings, or large language model features in production systems.
  • Very good English communication skills and a data-driven, experimentation-oriented working style.

Responsibilities

  • Develop the Recommendation Engine behind ABOUT YOU homepage, product, and outfit pages using Node.js and TypeScript.
  • Deploy offline-trained machine learning models, including Matrix Factorization, Brand Similarity, and Image Embeddings, at Black Friday scale using Valkey, DynamoDB, and OpenSearch.
  • Design and implement personalization logic for feed assembly, fallback chains, deduplication, diversity, and A/B experiments.
  • Develop generative artificial intelligence features such as the streaming-based Gemini Fashion Advisor, focusing on low latency, session state, and efficient token-cost management.
  • Own reverse extract-transform-load pipelines that transfer model outputs from BigQuery into performant hot stores.
  • Monitor recommendation coverage and track relevant business key performance indicators through SQS and business intelligence systems.
  • Actively contribute to the architecture together with the Tech Lead.
  • Take end-to-end responsibility for the Recommendation Engine and assess how changes affect customer engagement.

Desired Qualifications

  • Foundational knowledge of recommender systems, including collaborative filtering, Matrix Factorization, cold-start handling, or algorithms that improve diversity.
  • Experience with streaming-based generative artificial intelligence or large language model products, such as chat user experience, prompt caching, or guardrails.
  • Familiarity with AWS serverless services, especially DynamoDB data modeling and SQS/SNS, and with OpenSearch k-nearest-neighbor indexes.
  • Knowledge of performance optimization, including profiling with clinic.js or flamegraphs, and load testing with k6.

About the Company

ABOUT YOU

E-commerce fashion retailer offering personalized recommendations

ABOUT YOU is an online fashion retailer that offers a wide range of clothing, shoes, and accessories from over 2,000 top brands. The company serves fashion-conscious women who follow the latest trends and styles. It runs on an e-commerce website that provides a seamless shopping experience with a user-friendly interface, easy ordering, and multiple payment options. Revenue comes from selling products directly to consumers, often supported by promotions and discounts. Data analytics power personalized shopping by recommending items based on individual preferences and browsing history. Compared with competitors, ABOUT YOU stands out with its expansive brand selection, data-driven personalized recommendations, frequent promotions, and a focus on a smooth online experience. The company's goal is to help customers discover and buy the latest fashion items efficiently while driving sales through tailored offerings.

Company size
1,001-5,000
Company stage
IPO
Headquarters
Hamburg, Germany
Founded
2013

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