Corstone Contractors LLC
Darwen Ullestad has extensive experience in the construction industry, currently serving as Preconstruction Manager and Senior Estimator at Corstone Contractors LLC since January 2004. With a strong background as a Senior Estimator and Project Estimator at the same company, Darwen Ullestad has developed expertise in preconstruction processes and project estimation, contributing significantly to the firm's success over nearly two decades.
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