Senior Backend Engineer - Search & Discovery (all genders)
ABOUT YOU SE & Co. KG Open · verified Oct 24, 2026 At a glance
Senior Backend Engineering role at ABOUT YOU SE & Co. KG. Hamburg or Berlin · full-time · €70,000–€85,000 base.
techroles summary, based on the employer's posting.
What you'll do
- Build the search engine in Node.js and TypeScript, covering query interpretation, entity matching and semantic vector retrieval
- Combine OpenSearch relevance, embedding similarity and user behavior signals into ranked search results
- Create pipelines that move entities, synonyms and product vectors from BigQuery into OpenSearch
- Serve Gemini and Vertex AI models within strict response times, using caching and fallback paths
- Test relevance with curated result lists, regression checks and ongoing A/B experiments
What you bring
- At least five years building scalable backend APIs with low response times, preferably in Node.js and TypeScript
- Hands-on Elasticsearch or OpenSearch expertise, including mappings, analyzers, percolators and scoring
- Strong judgment with ranked data, including merging results, removing duplicates and balancing scores against latency
- Experience bringing model scores, embeddings or LLM features into production, plus fluent English
Who this fits
This senior role suits a backend engineer who enjoys investigating search results and turning findings into technical changes. You'll work with a tech lead, analysts, engineers and product managers. The role is based in Hamburg or Berlin and is hybrid.
From the employer
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 to Have
- 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.
Simply apply online via our career page - we will get back to you as soon as possible!
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.
Backend Engineering work from LinkedIn, X, Reddit and Upwork, in one list.
Each morning you get everything that fits, strongest first.
Backend Engineering€70k+
Find me workBy the team behind techroles.