Spectra Engineers Limited is one of the leading Companies in Bangladesh. It started rolling its business with the inception of “Reza Construction” as a proprietorship firm in the year 1981, and later incorporated as a Private Limited Company in 1989 as Reza Construction Limited (RCL). Again, in the year 2011, the company name changed to Spectra Engineers Limited (SEL). However, Its’ primary concentration was in infrastructural development in Bangladesh.