Derm Group (T) LTD | 1,777 followers on LinkedIn. Two Decades of Professionalism, Expertise, and Reliability | Derm Group (T) LTD We are Class One Contractor for comprehensive Electricals, Telecommunications, HVAC, and ICT works. We are proud to be the largest and fastest-growing Tanzanian-owned company in the country. With a solid reputation for professionalism, reliability, and technical expertise, we have established ourselves as a leading provider of economically viable and technically superior solutions.