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Joern Carstensen

CTO at greentech

CTO C-Suite
j***@greentech.energy Sign up
Pro only
Pro only
Hamburg, Hamburg, Germany
greentech.energy

Company Details

Company: greentech
Industry: renewables & environment
Employees: 230
HQ Location: Hamburg, Hamburg, Germany
Company LinkedIn: Pro only

Technology Stack

Outlook Microsoft Office 365 CloudFlare Hosting Vimeo DoubleClick Conversion DoubleClick Mobile Friendly Google Dynamic Remarketing Facebook Login (Connect) Facebook Widget Google Tag Manager Adobe Media Optimizer Linkedin Marketing Solutions Facebook Custom Audiences WordPress.org Cedexis Radar Bootstrap Framework Google AdWords Conversion Remote

Professional Summary

Joern Carstensen is CTO at greentech. greentech operates in the renewables & environment industry and has 230 employees. Based in Hamburg, Hamburg, Germany. Classified as a c-suite-level CTO leader. Their organization's technology stack includes Outlook, Microsoft Office 365, CloudFlare Hosting, Vimeo, DoubleClick Conversion, and 14 other technologies.

C-Suite level · CTO
Verified Apr 21, 2026

Position in the CTO Rank Database

  • • Typical CTO compensation in Hamburg: $250,000 – $650,000 (median $420,000). Composite from levels.fyi, Glassdoor, and Payscale data; adjusted for state cost of labor.

Data compiled from LinkedIn public profiles, company filings, and verified public technology signals. Methodology & sources · Updated June 2026.

Frequently Asked Questions

How do I contact Joern Carstensen?

Joern Carstensen has a verified email address on file on CTO Rank. They work at greentech. Pro members can access direct email addresses, LinkedIn profiles, and phone numbers.

What company does Joern Carstensen work for?

Joern Carstensen is CTO at greentech, a company in the renewables & environment industry with 230 employees. The company is headquartered in Hamburg, Hamburg, Germany.

What is Joern Carstensen's role in technology leadership?

Joern Carstensen is classified as a CTO leader at the c-suite level.

What technologies does Joern Carstensen's organization use?

Joern Carstensen's organization uses a technology stack that includes Outlook, Microsoft Office 365, CloudFlare Hosting, Vimeo, DoubleClick Conversion, DoubleClick. This information is useful for sales teams, recruiters, and technology vendors.

Is Joern Carstensen open to recruiting or new opportunities?

CTO Rank does not track open-to-work status. The best approach is to reach out directly to Joern Carstensen using the verified contact information available to Pro members. When recruiting a CTO, personalizing your outreach with specifics about the role and tech stack typically yields the best response rate.

Can I pitch or sell to Joern Carstensen at greentech?

Joern Carstensen is CTO at greentech. CTOs like Joern Carstensen typically evaluate vendors in Outlook, Microsoft Office 365, CloudFlare Hosting, and related categories. Use CTO Rank Pro to get verified email and approach directly.

How accurate is Joern Carstensen's profile data?

CTO Rank verifies and refreshes profile data weekly. Joern Carstensen's profile includes verified contact details, company information, and technology stack data sourced from multiple public and proprietary sources.