Senior Data Scientist (m/f/d) - Search Engine - onsite in Hamburg or Berlin

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Senior Data Scientist (m/f/d) for a Search Engine, onsite in Hamburg or Berlin, joins the Customer & Shop Intelligence team to design and deploy NLP driven search algorithms that boost relevance and user experience. You’ll own end-to-end pipelines and bring models to production while improving retrieval and reranking in a fast, flat hierarchy. Required: Python and SQL, ML fundamentals, experience with large datasets, and cloud/CI/CD familiarity (GCP Vertex AI, SageMaker, GitLab CI/CD). Nice to have: BigQuery, time series, graph nets, MLflow. Apply via the portal with a CV that shows measurable impact, deployed projects, strong collaboration, and readiness for relocation or visa support if needed.

Job Description

We are looking for a Senior Data Scientist (m/f/d) to be part of the development of our Search Engine.

Our Search circle is embedded in our circle cluster “Customer & Shop Intelligence”, which is in charge of driving a personalized and inspirational shop experience.

Responsibilities include designing and implementing search algorithms, leveraging NLP techniques, and optimizing search results for relevance and efficiency. This role will play a pivotal role in ensuring our Search Engine delivers highly accurate and comprehensive results, enhancing the overall user experience.

What you will do

• Design and develop innovative algorithms to power a personalized shopping experience, leveraging cutting-edge machine learning techniques
• Deploy your solutions into production, taking full ownership and ensuring high performance and scalability
• Combine your data science expertise with a pragmatic, agile approach to find innovative solutions and drive measurable results within a fast-paced environment
• Challenge the status quo by identifying areas for improvement in existing retrieval and reranking systems, particularly those relying heavily on business logic, and propose data-driven solutions
• Thrive in a dynamic, fast-paced environment with a flat hierarchy, where your ideas and contributions can make a real difference

Who you are

• Proficiency in Python or experience with at least one scientific computing language (e.g., MATLAB, R, Julia, C++)
• Strong SQL skills with experience in analytical or transactional database environments
• Theoretical understanding of machine learning principles, coupled with a hands-on approach to building and iterating on models
• Proven experience in building and deploying machine learning solutions that deliver tangible business value
• Strong understanding of data structures, algorithms, and tools for efficiently handling large datasets (e.g. pandas, numpy, dask, arrow, polars, …)
• Experience designing, building, and managing data pipelines
• Familiarity with cloud-based model training and serving platforms (e.g., GCP Vertex AI, Amazon SageMaker)
• Solid understanding of statistical methods for model evaluation
• Big Data: Experience analyzing large datasets using statistical and machine learning techniques
• DevOps: Familiarity with CI/CD tools (e.g., GitLab CI/CD, Hashicorp Terraform) is a plus
• Generative AI: Experience with generative AI and agentic frameworks (e.g., LangChain, ADK, CrewAI, Pydantic AI, …) is a plus
• Understanding of recommendation, retrieval and reranking systems in e-commerce and retail is a plus
• Excellent written and verbal communication skills in English
• Ability to effectively communicate complex machine learning concepts to both technical and non-technical stakeholders
• Proven ability to collaborate effectively within a team to establish standards and best practices for deploying machine learning models
• A proactive approach to knowledge sharing and fostering a quick development environment

Nice to have

• Experience with BigQuery Knowledge of time series and (graph) neural network models
• Familiarity with statistical testing and Gaussian Processes
• Strong Knowledge of Computer Vision libraries, (e.g. OpenCV, TensorFlow, PyTorch)
• Experience maintaining Machine Learning pipelines through MLOps frameworks (e.g. MLFlow, Kubeflow, …)
• Experience with deep learning libraries (e.g., TensorFlow, PyTorch)
• Experience building interactive dashboards (e.g. using Streamlit, Voila, Gradio)
• Experience with GCP or AWS, including infrastructure-as-code and CI/CD pipelines
• Practical knowledge of Docker

What you will get on top

• Grow together with one of the fastest growing eCommerce companies in Europe
• Flexible working times
• 40% discount on our online shop
• Fresh fruits + drinks everywhere
• Language courses (German & English)
• Free sports courses & reduced price for gym membership
• Subsidized public transportation ticket
• Free choice of hardware and operating system (Mac, Windows, Linux) also for private usage
• State-of-the-art tech stack running on AWS
• Modern office in the city center of Hamburg
• International working environment and English as company language
• Company flats (subject to availability)
• Agile work environment (MOVE) and cross-functional teams
• Free access to Germany’s greatest developer conference code.talks
• German health insurance included
• Help in relocation and VISA process

YOU ARE THE CORE OF ABOUT YOU.

We take responsibility for creating an inclusive and exceptional environment where all genders, nationalities and ethnicities feel welcomed and accepted exactly as they are. We believe that a diverse workforce essentially contributes to the ABOUT YOU culture. In order to maintain talent and diversity, we emphasize the care for physical health, mental health and overall well-being. Our values and work ethics essentially contribute to our brand mission: empower acceptance and shape an inclusive, fair and circular fashion culture.

We are looking forward to receiving your application – preferably via our online application portal! This way, we can ensure a faster process and for you it is very easy to upload your application documents. :-)