Senior Data Scientist Consultant

Mission Overview: Keystone Solutions is looking for a Senior Data Scientist for a consultancy mission with a client in Brussels. You will be hired by Keystone Solutions and work as a K-Stone consultant within the client's Marketing and Communication environment, with 50% mandatory on-site presence in Brussels and 50% telework. The Predictive Models team provides responsible AI models that enable impactful and efficient campaigns by optimizing reach and relevance for customers and employees. Function and

Responsibilities:
As a Keystone Solutions consultant, you will join a team of motivated data scientists who are eager to learn, collaborate and share expertise. You will bring a proven track record in building and deploying data science models and expertise in using LLMs for text classification and summarization. Under Keystone Solutions' consultancy model, your responsibilities will include:
• Tackle various business challenges by creating responsible AI models to answer the needs of Marketing and Communication and make campaigns more relevant and impactful.
• Capture business needs, determine feasibility, build models and analyses to identify the most relevant target groups, and set up tests to measure model impact.
• Build models to support customer journey-driven marketing campaigns.
• Build pipelines that clean and structure web analytics and use LLMs to detect customer intent.
• Develop and deploy automated summarization models using LLMs or traditional NLP methods.
• Apply guidelines and best practices, including explainability, for building responsible AI models.
• Monitor and deploy AI models in production using a comprehensive stack of tools.
• Present technical concepts as clear, actionable insights to business owners and advise them on the use of models in campaigns. Language

Requirements:
• Fluent spoken and written English.
• Fluent spoken and written Dutch OR fluent spoken and written French.

Education:
You have a Master's degree or higher in a quantitative field such as statistics, mathematics or computer science. Candidates with other academic backgrounds and substantial experience in data science are also encouraged to apply. Required Experience and Knowledge: You have at least 5 years of relevant experience. Mandatory Technical

Experience:
• Expert-level Python programming and expertise in the Python data science environment, including scikit-learn, transformers, PyTorch and TensorFlow.
• Proven ability to fine-tune, evaluate and operationalize LLMs and embedding models for production use in marketing contexts.
• Solid understanding of statistical methods, experiment design and machine learning algorithms, including traditional machine learning and deep learning.
• Expertise in using LLMs for text classification, RAG, interpretability, guardrails and validation of LLM-driven predictions.
• Hands-on experience with MLflow for experiment tracking, model versioning and CI/CD pipelines in AI/ML workflows.
• Expertise in customer journey modeling, such as next best action.
• Experience with Git and Bash.
• Experience with SQL. Preferred Technical

Experience:
• Experience with active learning techniques to iteratively improve models.
• Experience with uplift modeling.
• Experience with Marketing Mix Modeling and optimization under constraints.
• Experience with SAS.
• Experience with Streamlit. Working Model: This consultancy mission requires 50% mandatory presence at the client's Brussels office and allows 50% telework. As a Keystone Solutions consultant, you will represent Keystone Solutions at the client site while collaborating closely with client stakeholders and fellow specialists. Soft

Skills:
• Take ownership and demonstrate the ability to drive projects end-to-end with minimal guidance.
• Ability to translate data insights into actionable business recommendations.
• Quick learner and autonomous.
• Clear and concise communication.
• Team player.
• Proactive attitude and results-driven approach.
• Analytical and problem-solving mindset. Why Keystone Solutions: As a K-Stone, you bring Keystone Solutions' core values to every engagement while building your consultant identity through meaningful on-site collaboration. Our consultancy model gives you exposure to dynamic projects and diverse challenges across client environments, creating turbo-charged learning through broad technical, business and stakeholder experiences. Keystone Solutions also supports skyrocketing ambition by enabling continued professional development and career growth across challenging consultancy assignments. Apply Today: If you are ready to tackle technical and strategic challenges in a dynamic consultancy environment, apply today at Keystone Solutions Career Portal.