Senior Backend Engineer - Search & Discovery (all genders)

SmartRecruiters, Inc.; Hamburg, Berlin; Vor Ort; EUR 70.000 - 85.000; Vollzeit

Zusammenfassung

ABOUT YOU in Hamburg (Germany) is seeking a Senior Backend Engineer for Search & Discovery to own scalable backend APIs and advanced search features. You will build the search infrastructure, focusing on query understanding, entity resolution, and semantic vector search using Node.js/TypeScript.

You will blend OpenSearch relevance with embedding similarity and behavioral re-ranking signals, while streaming pipelines from BigQuery into OpenSearch.

Qualifikationen

• 5+ years of experience building scalable, low-latency backend APIs.
• Strong Elasticsearch/OpenSearch experience.
• Experience with Node.js/TypeScript.
• Familiarity with ML embeddings and LLM features.
• Fluent English communication.

Aufgaben

• Develop the search engine backend for query understanding and semantic vector search.
• Blend OpenSearch relevance with embedding similarity and re-ranking.
• Build search-index pipelines from BigQuery into OpenSearch.
• Integrate LLMs and embeddings with caching and latency budgets.
• Collaborate with the tech lead, data analysts, engineers, and product managers.
• Guard search relevance with tests and A/B experiments.

Kenntnisse

Backend APIs

Node.js/TypeScript

Java/Go/Kotlin

Elasticsearch/OpenSearch

LLM integration

Latency optimization

English communication

Tools

BigQuery

dbt

Dagster

Jobbeschreibung

Senior BackendEngineer - Search & Discovery (all genders)

• Full-time
• Compensation: EUR 70,000 - EUR 85,000 - yearly

ABOUT YOU is one of Europe’s fastest growing e-commerce companies. Based in Hamburg and Berlin, we operate at the intersection of fashion and technology. Our mission is to rethink online shopping and make it personal and seamless. This takes more than good ideas. It takes people who take initiative and challenge the status quo. We believe in flat hierarchies, direct communication, and pragmatic decisions. No long approval chains. Just ownership, trust, and clear responsibility. We work hard, but we also believe in enjoying the ride together - over team lunches, afterwork drinks, company events, or a quick coffee in between meetings. If this sounds like you, ABOUT YOU could be the right place to bring in your perspective.

• Develop the search engine behind ABOUT YOU, covering query understanding, entity resolution, and semantic vector search in Node.js/TypeScript
• Blend OpenSearch relevance, embedding similarity, and behavioral re-ranking signals into unified search results
• Build search-index pipelines (entities, synonyms, k-NN product vectors) streaming data from BigQuery into OpenSearch
• Integrate LLMs and embedding models (Gemini, Vertex AI) under tight latency budgets with caching and fallback layers
• Guard search relevance using golden lists, regression suites, and continuous A/B experiments
• Shape architecture alongside our Tech Lead and collaborate closely with data analysts, engineers, and product managers
• • You love investigating the "why" behind search outcomes and turning those findings into actionable technical improvements
  • 5+ years of experience building scalable, low-latency backend APIs (Node.js/TypeScript preferred, or fast-converting from Java, Go, or Kotlin)
  • Real depth in Elasticsearch/OpenSearch (mappings, custom analyzers, percolators, scoring functions) beyond just basic query clients
  • Strong algorithmic intuition for ranked data (merging, deduplication, score blending, and latency trade-offs)
  • You're excited to bridge backend engineering and ML by serving model scores, embeddings, or LLM features in production
  • Fluent English communication skills and a pragmatic, data-curious mindset

Nice toHave

• IR/NLP fundamentals (tokenization, multilingual search, relevance evaluation frameworks)
• Vector search experience (k-NN/HNSW indices, SigLIP embeddings, recall vs. latency tuning)
• LLM engineering (prompt caching, timeout budgets, Datadog LLM Observability)
• Familiarity with BigQuery, dbt, or Dagster pipelines

Your perks at a glance: Visit our benefits page .
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.