Company Details
Technology Stack
Professional Summary
Stefan Kleff is CTO at HRS Group. HRS Group operates in the information technology & services industry and has 1400 employees. Based in Berlin, Berlin, Germany. Classified as a c-suite-level CTO leader. Their organization's technology stack includes Akamai, Route 53, Outlook, Act-On, Amazon AWS, and 49 other technologies. HRS Group reports annual revenue of 224999000.
Industry & Role Insights
- • CTO Rank tracks 138,833 CTO leaders with verified contact information.
- • There are 166,587 tech leaders in the information technology & services industry in our database.
- • We have verified contacts for 7 tech leaders at HRS Group.
- • 4,166 tech leaders in Berlin are available in our database.
Position in the CTO Rank Database
- • Stefan Kleff is 1 of 140,489 leaders with the CTO role tracked in the CTO Rank database.
- • 62,499 hold the CTO role at information technology & services companies (out of 167,492 total information technology & services leaders in our database).
- • 1,457 hold the CTO role in Berlin.
- • 290 hold the CTO role at companies with 1400 employees.
- • Typical CTO compensation in Berlin: $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 Stefan Kleff?
Stefan Kleff has a verified email address on file on CTO Rank. They work at HRS Group. Pro members can access direct email addresses, LinkedIn profiles, and phone numbers.
What company does Stefan Kleff work for?
Stefan Kleff is CTO at HRS Group, a company in the information technology & services industry with 1400 employees. The company is headquartered in Koeln, Nordrhein-Westfalen, Germany.
What is Stefan Kleff's role in technology leadership?
Stefan Kleff is classified as a CTO leader at the c-suite level.
What technologies does Stefan Kleff's organization use?
Stefan Kleff's organization uses a technology stack that includes Akamai, Route 53, Outlook, Act-On, Amazon AWS, Facebook Conversion Tracking. This information is useful for sales teams, recruiters, and technology vendors.
Is Stefan Kleff open to recruiting or new opportunities?
CTO Rank does not track open-to-work status. The best approach is to reach out directly to Stefan Kleff 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 Stefan Kleff at HRS Group?
Stefan Kleff is CTO at HRS Group. CTOs like Stefan Kleff typically evaluate vendors in Akamai, Route 53, Outlook, and related categories. Use CTO Rank Pro to get verified email and approach directly.
How accurate is Stefan Kleff's profile data?
CTO Rank verifies and refreshes profile data weekly. Stefan Kleff's profile includes verified contact details, company information, and technology stack data sourced from multiple public and proprietary sources.
Get full access
Unlock verified emails, phone numbers, LinkedIn profiles, and CSV exports for 485,000+ tech leaders.
Upgrade to Pro