Senior Data Scientist — Responsible AI for Marketing

Exsolvæ; Brussel Hoofdstad; Hybrid; EUR 90,000 - 120,000; Full time

Job summary

Exsolvæ is seeking a Senior Data Scientist to join the Brussels marketing data science team. You will build responsible AI models to improve campaign relevance using large language models and structured data, shaping end-to-end data pipelines and production deployments.

You will own model development, evaluation, and dashboards, while mentoring peers and aligning with business goals. The role requires 5+ years in data science, a Master’s in a quantitative field, and on-site presence in Brussels

Qualifications

• Master's degree in a quantitative field (statistics, mathematics, CS) or related with strong data science background.
• Senior profile: minimum 5 years of relevant data science experience.
• Expert Python and its data science ecosystem with solid engineering practices (git, bash, SQL).
• Expertise in customer journey modeling and ML methods including LLMs for text classification.
• Fluent English and either French or Dutch; based in Belgium and able to be on-site in Brussels 50% of the time.

Responsibilities

• Build responsible AI models for marketing campaigns from targeting to customer journey-driven actions.
• Use LLMs and fine-tuned models to transform unstructured text into actionable insights.
• Own full lifecycle: capture business needs, feasibility, models, data pipelines, deployment and monitoring.
• Set up rigorous evaluation including experiment design, impact measures, guardrails and validation.
• Develop dashboards and feedback loops for business users to refine predictions; apply MLOps best practices.
• Translate technical results into clear business insights and mentor junior data scientists.

Skills

Python & data science

Customer journey modeling

Experiment design

Statistical methods

LLMs for text classification

English fluency

French or Dutch fluency

ML engineering practices

Education

Master's degree in quantitative field

Tools

Git

Bash

SQL

scikit-learn

PyTorch

TensorFlow

MLflow

Streamlit

Job description

Exsolvæ is seeking a Senior Data Scientist to join the Brussels marketing data science team. You will build responsible AI models to improve campaign relevance using large language models and structured data, shaping end-to-end data pipelines and production deployments.

You will own model development, evaluation, and dashboards, while mentoring peers and aligning with business goals. The role requires 5+ years in data science, a Master’s in a quantitative field, and on-site presence in Brussels