Senior Data Scientist Consultant

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.

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.

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

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.

You have at least 5 years of relevant 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.

• 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.

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.

• 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.

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.

If you are ready to tackle technical and strategic challenges in a dynamic consultancy environment, apply today at Keystone Solutions Career Portal.