Stefan Kellner

Stefan Kellner serves as CEO at kollex. kollex operates in the information technology & services sector with approximately 52.0 employees. The company is headquartered in Berlin, Berlin.

Industry & Role Insights

• • MessageCEO tracks 50,503 executives in the information technology & services sector.
• • We have verified contacts for 3 executives at kollex.
• • 1,259 executive contacts are available in Berlin.
• • Our database includes 201,468 c suite-level executives.

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MR

Marco Rossdeutscher Chief Technology Officer (CTO) at kollex

FF

Fabian Fulling CTO at kollex

MJ

Marvin Jo CTO at 위블링

RK

Robert Kim CEO, North America at 당근마켓

KL

Kyung Lim CTO at 인터파크

Outreach Guidance — information technology & services Sector

Technology executives make decisions on infrastructure, tooling, and partnerships. When reaching out to Stefan Kellner, lead with your value proposition relative to the stack they currently use. Generic pitches perform poorly; specific technical relevance is key.

Stefan Kellner's Position in the MessageCEO Database

• •Stefan Kellner is 1 of 3 verified executive contacts we track at kollex.
• •49,754 verified executive contacts in information technology & services are in the MessageCEO database.
• •1,253 verified executive contacts in Berlin are in the database.
• •385 verified contacts work at information technology & services companies in the 52.0 employee range (same size as kollex).

Executive contact data compiled from public business filings, LinkedIn public profiles, company press materials, and verified outbound email testing. We do not publish personal addresses or sensitive identifiers. Methodology & sources · Removal requests handled at /remove-info · Updated July 2026.

How do I reach Stefan Kellner directly?

Stefan Kellner's verified email address is available to MessageCEO Pro subscribers. They currently serve as CEO at kollex. Access direct contact info to skip gatekeepers and reach the decision maker.

What company does Stefan Kellner work for?

Stefan Kellner is CEO at kollex, a company in the information technology & services sector with 52.0 employees. The company is based in Berlin, Berlin.

Can I pitch or sell to Stefan Kellner?

As CEO at kollex, Stefan Kellner is a key decision-maker in the information technology & services sector. MessageCEO Pro gives you verified email to reach Stefan Kellner directly — ideal for B2B sales, partnerships, and executive recruiting.

What industry is Stefan Kellner in?

Stefan Kellner works in the information technology & services industry as CEO at kollex. MessageCEO provides verified contact information for executives across all major industries.

Is Stefan Kellner's contact information verified?

Yes. MessageCEO verifies executive contact information through multiple data sources and regular validation checks. Stefan Kellner's profile is kept up-to-date with the latest available information.

Last updated: July 24, 2026