**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.