VAT Advisory
Advice on European VAT obligations, cross-border transactions and supply chains.

Independent VAT and tax technology support, tailored to your business.
Advice on European VAT obligations, cross-border transactions and supply chains.
Support with configuration, tax content and implementation projects.
Practical automation to streamline recurring indirect tax tasks and reduce manual effort.
Indirect tax & tax technology specialist
Based in The Hague, Netherlands
Vertex O Series for EU Value Added Tax Associate Implementer
Certified September 2026
Vertex O Series Functional Implementation (VAT)
Awarded January 2021
I’m drawn to technology for what it can make possible: taking a complex tax requirement and finding a clearer, more efficient way to put it into practice. Combining that curiosity with my indirect tax background is what led me into tax technology—and continues to shape the way I work.
My grounding is in VAT advisory, helping multinational companies meet their European VAT obligations, particularly in commodity trading and eCommerce. Working with cross-border transactions and supply chains taught me to look beyond an isolated tax question and understand the commercial activity behind it.
At Vertex, I brought that perspective into tax content and product development, contributing to enhancements such as tax determination logic for multi-party chain transactions. Alongside this, I assisted with Vertex O Series configuration during implementation projects. This gave me experience of both the tax reasoning behind the software and its application to business requirements.
Today, I combine European VAT expertise, global indirect tax knowledge and practical Vertex O Series experience to support businesses and advisory firms. I particularly enjoy work that calls for both tax judgement and technical curiosity: understanding the problem, working through the detail and finding a solution that makes sense in practice.
An initial discussion establishes the challenge, the systems involved and the support required. A practical scope and next steps are then agreed.
Start a conversation about your next project.
azem.sahin@astaxengineer.com ↗Looking for specialist input or additional support for your team?
Connect with Azem on LinkedIn ↗
Available for new assignments from February 2027.