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About the Role

Development of the search engine for ABOUT YOU, focusing on query understanding, entity resolution, and semantic vector search in Node.js/TypeScript. Combining OpenSearch relevance, embedding similarity, and behavior-based re-ranking signals for unified and relevant search results. Building and advancing search index pipelines for entities, synonyms, and k-NN product vectors, transferring data from BigQuery to OpenSearch. Integrating LLMs and embedding models like Gemini and Vertex AI under strict latency requirements, including caching and fallback mechanisms. Ensuring search quality through golden lists, regression suites, and continuous A/B experiments. Co-designing the architecture with the Tech Lead and collaborating closely with Data Analysts, Engineers, and Product Managers.

Responsibilities

Development of the search engine for ABOUT YOU with a focus on query understanding, entity resolution, and semantic vector search in Node.js/TypeScript.
Combining OpenSearch relevance, embedding similarity, and behavior-based re-ranking signals into unified and relevant search results.
Building and advancing search index pipelines for entities, synonyms, and k-NN product vectors, transferring data from BigQuery to OpenSearch.
Integrating LLMs and embedding models like Gemini and Vertex AI under strict latency requirements, including caching and fallback mechanisms.
Ensuring search quality through golden lists, regression suites, and continuous A/B experiments.
Co-designing the architecture with the Tech Lead and collaborating closely with Data Analysts, Engineers, and Product Managers.

Requirements

Enjoy delving into the 'why' behind search results and deriving concrete technical improvements.
3+ years of experience in developing scalable, low-latency backend APIs, ideally with Node.js/TypeScript. Alternatively, possess experience with Java, Go, or Kotlin and a quick ability to learn new technologies.
In-depth practical experience with Elasticsearch/OpenSearch, particularly with mappings, custom analyzers, percolators, and scoring functions, beyond just using query clients.
Strong algorithmic understanding for ranked data, such as merging and deduplicating results, combining scores, and balancing latency with result quality.
Interest in connecting backend engineering and machine learning, deploying model scores, embeddings, or LLM features in production systems.
Very good communication skills in English.
Pragmatic and data-oriented approach to work with strong curiosity for new challenges.

Skills

Node.js
TypeScript
OpenSearch
Elasticsearch
LLMs
Gemini
Vertex AI
BigQuery
Information Retrieval
NLP
k-NN
HNSW
SigLIP
dbt
Dagster

Location

Hamburg
Berlin

Work Type

Full-time

Experience Level

3+ years of experience

Salary/Compensations

EUR 60000 - EUR 70000

Benefits

Team lunch
After-work drinks
Company events
Coffee breaks

About the Company

ABOUT YOU is one of Europe's fastest-growing e-commerce companies.
We combine fashion and technology.
Our mission is to rethink online shopping and make it more personal.
We foster flat hierarchies, direct communication, and pragmatic decisions.
We work dedicatedly while also enjoying our time together.

Equal Opportunity

A place where you can be yourself.
We are committed to creating an environment where everyone feels welcome.
Diverse backgrounds and perspectives strengthen us and shape our culture.
We stand for acceptance, inclusion, and a fairer approach to fashion.