Owner And Zzp-Er
Ingenieursbureau Tjoa
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Koen Tjoa Email & Phone Number
Owner and ZZP-er
at
Ingenieursbureau Tjoa
1 work email found
@tjoa.nl
LinkedIn matched
✓ Verified May 2026
4 data sources
Profile completeness 100%
Who is Koen Tjoa? Overview
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Quick answer
Koen Tjoa is listed as Owner and ZZP-er at Ingenieursbureau Tjoa, based in Zeist, Utrecht, Netherlands. AeroLeads shows a work email signal at tjoa.nl and a matched LinkedIn profile for Koen Tjoa.
Koen Tjoa previously worked as Owner/ZZP-er at Ingenieursbureau Tjoa and Development HIMS (Hygiene Information Management System) at Eco2Clean B.V.. Koen Tjoa holds Lichte Muziek from Schumann Akademie, Utrecht.
Company email context
Email format at Ingenieursbureau Tjoa
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*@tjoa.nl
68% confidence
AeroLeads found 1 current-domain work email signal for Koen Tjoa. Compare company email patterns before reaching out.
Profile bio
About Koen Tjoa
Independent entrepreneur working as an IT consultant, application developer and database designer in several kinds of business and (food) industry.Specialties: Database development, Windows application development, Clarion for Windows, MS SQL Server, Microsoft Power BI, Microsoft PowerApps.
Listed skills include Databases, Software Development, Sql, Microsoft Sql Server, and 12 others.
Current workplace
Koen Tjoa's current company
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8 roles
Koen Tjoa work experience
A career timeline built from the work history available for this profile.
Owner/Zzp-Er
CurrentIT consulting and Clarion application development (applications for Windows), database design, Microsoft PowerBI.
Oct 1999 - Present
Development Hims (Hygiene Information Management System)
CurrentDit is een groep van applicaties bestaande uit onder andere een desktopapplicatie en een API-server voor het beheer van schoonmaakactiviteiten in de Food industrie.
Mar 2008 - Present
Website Designer
Tjoa Photography
A photo website for my brother which is designed to have as little distraction as possible.(http://www.tjoa.photography)
Apr 2015 - Nov 2015
It Consultant
Arthur Interim Management
IT support for the Arthur management professionals network. Setup Sharepoint MS Exchange and website.
Aug 2006 - Jul 2008
It Consultant
Advice / sparring partner of the director software development for the design of a new version of FOBIS, an application for the management of (logistical) processes in the meat and fish processing industry. System Analyst, formulation of definitions and design data model.
Dec 2000 - May 2005
Systeembeheerder-Programmeur
Lease Management Services B.V.
Development of financial software for the small-ticket vendor lease (in Clarion for Windows). Technical and functional design. Manage program standards. Directing other programmers. System engineering (Novell 3.12/4.11 and GoupWare). Purchase hard- and software. IT-specialist.
Apr 1996 - Sep 1999
Programmeur
Programmeur, Rgl International B.V. (Later Cal Consult)
Junior programmer for two logistic applications build in Uniface. Customer support.
Aug 1994 - Apr 1996
6 education records
Koen Tjoa education
Lichte Muziek
Schumann Akademie, Utrecht
Ing., Hts Algemene Operationele Technologie
High School
Rsg Schoonoord, Zeist
High School
Sint-Joris College, Eindhoven
Elementary School
Eikenstein, Eindhoven
Elementary School
Lucasschool, Tilburg
FAQ
Frequently asked questions about Koen Tjoa
Quick answers generated from the profile data available on this page.
What company does Koen Tjoa work for?
Koen Tjoa works for Ingenieursbureau Tjoa.
What is Koen Tjoa's role at Ingenieursbureau Tjoa?
Koen Tjoa is listed as Owner and ZZP-er at Ingenieursbureau Tjoa.
What is Koen Tjoa's email address?
AeroLeads has found 1 work email signal at @tjoa.nl for Koen Tjoa at Ingenieursbureau Tjoa.
Where is Koen Tjoa based?
Koen Tjoa is based in Zeist, Utrecht, Netherlands while working with Ingenieursbureau Tjoa.
What companies has Koen Tjoa worked for?
Koen Tjoa has worked for Ingenieursbureau Tjoa, Eco2Clean B.V., Tjoa Photography, Arthur Interim Management, and Rbk Group.
How can I contact Koen Tjoa?
You can use AeroLeads to view verified contact signals for Koen Tjoa at Ingenieursbureau Tjoa, including work email, phone, and LinkedIn data when available.
What schools did Koen Tjoa attend?
Koen Tjoa holds Lichte Muziek from Schumann Akademie, Utrecht.
What skills is Koen Tjoa known for?
Koen Tjoa is listed with skills including Databases, Software Development, Sql, Microsoft Sql Server, Windows, Uml, Database Design, and Lindy Hop.
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