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# Data Analyst

- **Company:** Octagon
- **Location:** 'S-GRAVENHAGE, Netherlands
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Data Analysis, Big Data, Computer Programming, Data Cleansing, Information Engineering, Database Queries, HR Analytics, Python (Programming Language), Power BI, SQL Stored Procedures, SQL Databases, Tableau (Software), Technical Data Management Systems, Sql Optimization, Information Technology, Star Schema, Data Pipelines
- **Published:** July 15, 2026
- **Apply:** https://www.aplitrak.com/?adid=dHJhaW5lZS5yZWNydWl0bWVudC45ODc2Ni4xMjIxNUBvY3RhZ29uLmFwbGl0cmFrLmNvbQ

## About the Role

We are looking for a highly skilled Senior Data Analyst to support business control projects in HR, finance, and operations. You will take full ownership of the data lifecycle-from extraction and cleaning to modeling and dashboard delivery. This role is ideal for someone comfortable working with unstructured or "dirty" data and translating it into actionable insights for stakeholders., * Bachelor's or Master's degree in Data Science, Computer Science, Engineering, Business Analytics, or related field.

 * 5+ years of experience in Data Engineering, Analytics Engineering, or related roles.
 * Experience in business control, finance, or HR analytics.
 * Experience in large or complex organizations is a plus.
 * Fluent in English.

Required Skills & Competencies:

 * Advanced SQL (complex queries, stored procedures, window functions).
 * Power BI or Tableau mastery (report development, data modeling, advanced calculations).
 * Programming skills in Python or R (data cleaning, transformation, automation).
 * Experience handling unstructured, error-prone, or complex datasets.
 * Strong analytical, problem-solving, and attention-to-detail skills.
 * Ability to communicate technical data limitations to non-technical stakeholders.
 * Proactive, curious, and committed to delivering high-quality results.

## Description

* End-to-end ownership of data projects: extraction, cleaning, transformation, modeling, and visualization.
 * Build scalable, high-quality data pipelines and perform advanced data cleaning (Python/SQL).
 * Design and maintain interactive dashboards (Power BI/Tableau) with optimized DAX/M-Query and Star Schema data models.
 * Analyze workforce, timesheets, reimbursement requests, purchase orders, internal costs, audits, and mission data.
 * Collaborate with stakeholders to understand reporting needs and deliver actionable insights.
 * Identify opportunities to improve data quality, reporting efficiency, and business processes.


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