David Hammel is a CTO and COO at TSV Professional Services at TSV. He possess expertise in sip, unified communications, telephony, avaya, voip and 16 more skills. He is proficient in German and English. Colleagues describe him as "David is very professional , friendly, knowledgeable and flexible person. I have been supprised several times by his flexibillity, technical knowledge and creativity to resolve our questions and problems. I would hire him on the spot or suggest to hire him if people ask me this." and "I worked with David on a critical escalation. It was a pleasure working with him even the escalation wasn’t funny. He is having a deep understanding from the technology. Beside of his deep technical skills is he a great character. It was really a pleasure working with him together."