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Theo Den Hollander Email & Phone Number

CTO at 123test BV

Location: Arnhem-Nijmegen Region, Netherlands 7 work roles 1 school

1 work email found @hollandware.com LinkedIn matched

✓ Verified August 2026 4 data sources Profile completeness 100%

Current company

123test BV

Role

CTO

Location

Arnhem-Nijmegen Region, Netherlands

Company size

4 employees

Who is Theo Den Hollander? Overview

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Quick answer

Theo Den Hollander is listed as CTO at 123test BV, a with 4 employees, based in Arnhem-Nijmegen Region, Netherlands. AeroLeads shows a work email signal at hollandware.com and a matched LinkedIn profile for Theo Den Hollander.

Theo Den Hollander previously worked as Partner at The International High IQ Society at International High Iq Society and Partner at Testingtalents Bv. Theo Den Hollander holds Master'S Degree, Computer Science from Radboud University.

Company email context

Email format at 123test BV

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{first}@hollandware.com

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AeroLeads found 1 current-domain work email signal for Theo Den Hollander. Compare company email patterns before reaching out.

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Profile bio

About Theo Den Hollander

Responsible for the entire technical backbone i.e., architecture, the software product line, to ensure consistency, quality and productivity in it.From our DISC personality test (https://www.123test.com/disc-personality-test/), my personality profile is frequently called ‘The Results-Oriented‘:"You are individualistic, demanding and persistent. You seek out challenging situations and are responsive to competition. You should be able to handle the daily stresses and pressures of work and life. However, when really pushed, you may become rather irritable and fault-finding. People see you as a 'take charge' sort of person who is self-confident and strives for results."From our extended Jung personality type test (https://www.123test.com/jung-personality-test/), you can characterize me as Introvert-iNtuitive-Feeler-Judger (INFJ) personality type: "Developer" or "Author" and it is shared by approximately 1% of the population. An INFJ on a team: Encourages harmony and gets everyone to contribute. Brings enthusiasm and forward thinking to a project. Provides big picture overviews and in-depth synopsis of situations and problems.INFJ leadership style: Becomes an advocate for others and their talents when leading. Inspires others to follow through his/her enthusiasm and faith. Can become a champion for ideas and causes.INFJ Communication Style: energy and excitement inside self. Prefers to think before replying and needs to be drawn out. Prefers written reports over talking in person. Prefers language that is global and metaphoric, instead of precise and plain.Problem solving style (INFJ):Is comfortable with complicated situations. Perceives the abstract relationships between subjects first, then fits all the pieces together. Looks first at the big picture, then contemplates people. Next applies logic and finally turns to the facts. Asks if the current problem is similar to a previous event. Wants to know what all the possibilities and alternative solutions are to a problem.

Listed skills include Software Development, Databases, .Net, Scrum, and 29 others.

Current workplace

Theo Den Hollander's current company

Company context helps verify the profile and gives searchers a useful next step.

123Test Bv

CTO

netherlands

Website

123test.nl

Employees

4

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Company profile

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7 roles

Theo Den Hollander work experience

A career timeline built from the work history available for this profile.

Cto

Current

123Test Bv

Nijmegen

123test offers psychological tests for career and personal development to consumers in a freemium business model. Besides having the Netherlands as a home market, 123test is rapidly expanding in English and Spanish speaking markets with footholds and growing positions in German and French. Our tests are not marketing tools and privacy really matters.We also develop, host and market the official admissions IQ test of the International High IQ Society. This admissions IQ test is a fully adaptive, IRT based culture fair intelligence test.Currently almost 50k visitors daily take tests with 123test, filling out over 9M tests annually by answering 1,5BN questions.

Apr 2013 - Present

Partner At The International High Iq Society

International High Iq Society

The International High IQ Society represents a contemporary movement to stimulate discussions on a variety of intellectual topics. We provide our members with a platform to present their ideas, discuss them in a friendly environment, and enjoy learning again. We hope you will join us!Membership is open to those who possess an IQ score in the top five percent of the population. Prospective members can join using certified IQ test scores from our online admissions IQ test at IQ-test.com, or by submitting evidence of qualifying IQ scores from a prior intelligence test within our approved list of IQ tests.

Partner

Testingtalents Bv

TestingTalents offers white label psychological tests for career and personal development to career professionals. No thresholds, no expensive licenses, very easy to use. Over 5.000 career professionals already registered, hundreds of thousands of clients were guided.Also, several large multinationals, universities and companies have incorporated our tests in their intranet for e-coaching and employability.

Owner

Hollandware

Making buildings more sustainable through consulting on building physics through execution of technical installation (heat pumps, solar panels, insulation) with custom home automation, web applications and software (AI).

Jan 1998 - Jan 2021

Lead Software Developer | Financial Architect

Brand New Day

Amsterdam Area, Netherlands

Architect/developer of the financial core of BND Thirdpillar and BND PPI, automatic transfer recognition, transaction-, nav-system, interfacing between banks and brokers, one billion euro deposit amount.Design, planning, development and testing for Brand New Day. Front- and backoffice, CRM, business flow, .Net projects, MVC C#, Ajax, SQL server, ORM, Scrum and design patterns.

Jan 2010 - Mar 2013

Developer Ict Development

Abn Amro Bank N.V.

Development of frontoffice software: Florius, MNF, ABNAMROTechnical: .NET projects. Business engineering: Aquima framework, Everest BV. (cosource partner)Development method: SCRUM

Dec 2008 - Dec 2009

Developer Finance It

Rabobank International

Development of financial software, .NET software (C#) and FRS globalETL, Fire reports, Autosys, Kornshell and PL/SQLDatabase models design with optimal performanceDevelopment of test data and test methodsInteraction with business analystsDesign and maintenance of financial reportsThird line supportProjects: Oracle Migration, Rabo Securities, Milan, Warsaw, Sydney

Sep 2005 - Nov 2008

1 education record

Theo Den Hollander education

Radboud University

Computer Science

FAQ

Frequently asked questions about Theo Den Hollander

Quick answers generated from the profile data available on this page.

What company does Theo Den Hollander work for?

Theo Den Hollander works for 123test BV.

What is Theo Den Hollander's role at 123test BV?

Theo Den Hollander is listed as CTO at 123test BV.

What is Theo Den Hollander's email address?

AeroLeads has found 1 work email signal at @hollandware.com for Theo Den Hollander at 123test BV.

Where is Theo Den Hollander based?

Theo Den Hollander is based in Arnhem-Nijmegen Region, Netherlands while working with 123test BV.

What companies has Theo Den Hollander worked for?

Theo Den Hollander has worked for 123Test Bv, International High Iq Society, Testingtalents Bv, Hollandware, and Brand New Day.

Who are Theo Den Hollander's colleagues at 123test BV?

Theo Den Hollander's colleagues at 123test BV include Maxime Jodoin.

How can I contact Theo Den Hollander?

You can use AeroLeads to view verified contact signals for Theo Den Hollander at 123test BV, including work email, phone, and LinkedIn data when available.

What schools did Theo Den Hollander attend?

Theo Den Hollander holds Master'S Degree, Computer Science from Radboud University.

What skills is Theo Den Hollander known for?

Theo Den Hollander is listed with skills including Software Development, Databases, .Net, Scrum, C#, Javascript, Web Applications, and Microsoft Sql Server.

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