concern4

concern4.nl

Arnhem, Gelderland, Netherlands

1-10 employees

LinkedIn Profile

About concern4

duurzaamheidsprofessionals, energie, circulair, duurzame vacatures, duurzaamheid, mvo, installatietechniek, duurzame energieprojecten, energie sector groei, energie sector uitdagingen, energie sector transitie, consulting, energieopslag, services, energy, engineering, projectbegeleiding, construction, energie sector internationaal, energie innovatie

concern4's Tech Stack

AI/ML

Decision Makers at concern4

1 contact

Martijn Zomerplaag

Owner

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7 technologies detected · 1 decision maker · Emails available

Sales Outreach Angle

concern4 uses Mobile Friendly, Nginx, Bootstrap Framework among other technologies. Use StackWho to identify the right decision-maker email for targeted sales outreach, recruiting, or partnership development.

concern4's Position in the StackWho Database

• concern4 is 1 of 27,583 staffing & recruiting companies tracked in StackWho.
• 27,572 staffing & recruiting companies in our database have verified decision-maker emails (100% of the cohort).
• 830 companies in Gelderland are in the StackWho database.
• 18,718 staffing & recruiting companies are in the 1-10 employee range (same size as concern4).

Technology detection from public web signals. Decision-maker contacts compiled from LinkedIn public profiles, company filings, and verified outbound testing. Methodology & sources · Updated July 2026.

Frequently Asked Questions

What technology does concern4 use?

concern4 uses Mobile Friendly, Nginx, Bootstrap Framework, reCAPTCHA, Render, Deel, and 1 more technologies. This data is sourced from StackWho's technology detection engine.

How do I contact the decision makers at concern4?

StackWho has verified email addresses for 1 decision maker at concern4. Pro members can access direct emails for the CEO, CTO, VP of Engineering, and other key contacts. Use StackWho to reach concern4 directly for sales, recruiting, or partnerships.

What industry is concern4 in?

concern4 operates in the staffing & recruiting industry, headquartered in Arnhem, Gelderland, Netherlands. StackWho tracks technology stacks and decision maker contacts for companies across all industries.

Can I export concern4's contact data?

Yes. StackWho Pro members can export decision maker contact data for concern4 and similar companies to CSV. Use the export feature to build targeted prospect lists segmented by technology stack, industry, or location.