Online engineering and construction service providers Bidcom Inc. and Cephren Inc. will merge to form Citadon Inc., which will be based in San Francisco. Citadon combines Bidcom's expertise in managing business processes with Cephren's project management and collaborative commerce applications abilities.

The combined companies yield a new entity with more than 30,000 subscribers and a global portfolio of 1,200 projects worth more than $110 billion. Upon completion of the merger, Doug Sabella, president and CEO of Bidcom, will become CEO or Citadon, and Robert J. Majteles, CEO of Cephren, will become chairman of Citadon. The merger is expected to close by the end of the year.