The consulting engineering firm KALLIERGOS O.T.M. S.A. plays a prominent role and actively participates in significant infrastructure ventures within Greece, while also maintaining a strong presence in similar projects internationally. Established in 2004 through an internal reorganization of its predecessor, the long-standing company O.T.M. Ltd, which had been operational since 1965, it continues the legacy of delivering top-notch services to governmental bodies, general contractors, and private equity organizations. Headquartered in Athens, Greece, the firm operates from its privately-owned premises. Leveraging its extensive expertise and a team of highly skilled engineers, the company possesses the capabilities and resources to employ cutting-edge methods of structural and earthquake engineering for projects of varying scales and complexities. Furthermore, the company adheres to Quality Systems in line with ΕΝ ISO 9001:2015, certified by TÜV HELLAS (TÜV NORD) S.A., across all its operations.