GS Engineering & Construction (GS E&C), founded in 1969 as Lucky Development, is a major South Korean construction company and a subsidiary of GS Group, the eighth-largest conglomerate in South Korea. Headquartered in the GS Gran Seoul building in Jongno-gu, Seoul, GS E&C is publicly listed on the Korea Exchange. The company specializes in architecture, infrastructure, plant construction, and power projects, with a significant portion of its revenue generated domestically and a growing presence in the Middle East and Africa. Key services include designing and constructing power plants, refineries, water treatment facilities, residential and commercial buildings, and various infrastructure projects.