Who we are

We are consultants who produce immediate results and

embed our solutions within the customer’s organisation.




Our staff

Tino Wendriks
Tino Wendriks
Business consultant
Has been at Diesis since November 2005. Tino has a broad and versatile knowledge, but his main focus is on implementing business intelligence solutions, primarily in accounting environments. Recently more involved in Power BI and the Diesis-developed Reporting Hub.
Dennis Joseph
Dennis Joseph
Application consultant
Has been at Diesis since May 2006. Our BusinessObjects specialist with a strong accounting background. Is therefore able to translate an accounting department’s reporting issues into solid solutions. Good knowledge and experience of Unit4 Financials.
Menno Rouffaer
Menno Rouffaer
Application consultant
Has been at Diesis since May 2008. Good understanding of the Unit4 Financials application, both functionally and technically. Ensures customer satisfaction with his knowledge and pro-active attitude. Enjoys internal projects within the Diesis organisation, such as our website and product Development.
Jim Voorn
Jim Voorn
Application consultant
Has been at Diesis since March 2009. Knows the Unit4 Financials application functionality in and out, including the Assets module. Also involved in various Icorp projects, mainly involving the Icorp Time module.
Vincent Schuilenburg
Vincent Schuilenburg
Application consultant
Has been at Diesis since February 2015. Previously at Unit4, Vincent has an in-depth knowledge of all modules within the Unit4 Financials application. Specialises in the Procurement, Invoice Matching and Workflow modules. Has a broad accounting background.
Bart Pijls
Bart Pijls
Technical consultant
Has been at Diesis since September 2013. Bart is our SQL development specialist, using his in-depth knowledge mainly in Icorp projects. Always takes a structured approach, enabling him to translate the customer’s challenges into a perfect Icorp solution.
Jaap Broess
Jaap Broess
Technical consultant
Has been at Diesis since January 2015. Previously worked at the Unit4 organisation and has at Diesis found a new challenge in Icorp. As an implementation consultant, Jaap is involved in various projects concerning the Icorp Billing module. Also performs Unit4 Financials upgrades and installations.
André Visscher
André Visscher
Technical consultant
Has been at Diesis since March 2016. Knows all the ins and outs of the Unit4 Financials application. Specialises in executing upgrades and building bespoke solutions. His latest passion is Icorp, allowing him to apply his knowledge in an even wider field.
Peter Kadiks
Peter Kadiks
Technical consultant
Has been at Diesis since Januari 2017. Peter is not just just a SQL database specialist he also has knowledge of the SQL BI tools. Being a former treasurer accountancy has little secrets to him. His latest challenge: Icorp.