---
title: "Data Analyst"
description: "We turn raw client data into reliable foundations for AI solutions. As Data Analyst you audit and clean client data, spot patterns, measure whether a solution works and explain in plain language what the data shows. You work with our AI engineers and close to clients."
canonical: "https://www.whatsnext-ai.com/careers/data-analyst"
datePosted: "2026-10-28"
location: "Rotterdam (hybrid)"
employmentType: "FULL_TIME"
---

# Data Analyst

Data · Rotterdam (hybrid) · Full-time · 40 hours per week · Employed · €4,000 – €6,000 gross per month, plus 8% holiday allowance

We turn raw client data into reliable foundations for AI solutions. As Data Analyst you audit and clean client data, spot patterns, measure whether a solution works and explain in plain language what the data shows. You work with our AI engineers and close to clients.

## Responsibilities

- Audit and structure client data: identify gaps, clean sources, define schemas.
- Work with structured and unstructured data, such as documents, tables, emails or CRM data.
- Build pipelines in Python and SQL for data cleaning, preprocessing, deduplication and enrichment.
- Analyse data, recognise patterns and explain what you find to clients in non-technical language.
- Set up evaluation sets, metrics and test methods to judge AI output.
- Analyse why a solution does or does not work well, and how to improve it.
- Work with AI engineers so data quality never becomes the limiting factor.
- Advise clients on their data infrastructure needs and capabilities.

## Requirements

- Experience in analytics, data science, data engineering or a related field.
- Strong Python and SQL, and experience working with datasets.
- Experience with data cleaning, preprocessing and data quality.
- You can work with structured and unstructured data.
- You can evaluate solutions with metrics, test sets or other quality measures.
- Experience working directly with clients or business stakeholders.
- You can explain data insights in non-technical language.
- Good Dutch and English.
- HBO/WO working and thinking level.

## Nice to have

- Experience with pandas, Polars, scikit-learn, NumPy or similar tools.
- Experience with data modelling and pipeline tools such as dbt, Airflow or Dagster.
- Experience with PostgreSQL, DuckDB, BigQuery, Snowflake or similar.
- Familiarity with GCP or AWS cloud data platforms.
- Experience preparing unstructured data for LLM or RAG applications.
- Knowledge of GDPR, AI governance or working with sensitive business data.
- Consultancy or agency background.

## What we offer

- €4,000 – €6,000 gross per month, plus 8% holiday allowance.
- A 40-hour work week.
- Hybrid working from Rotterdam or Lelystad.
- A laptop for your work.
- The latest AI tools and subscriptions, paid by the company.
- You take the AI trainings we give clients yourself.
- A budget for professional development.
- Travel allowance and reimbursement for business trips.
- Short lines and little meeting overhead.
- Team dinners and outings.
- The opportunity to grow with the team.

[Apply](mailto:hr@whatsnext.cc?subject=Application: Data Analyst)