The builder is the technical organization and management personnel at the grass-roots level. The main work content is to go deep into the construction site under the leadership of the project manager, assist the construction supervision, check the engineering quantity together with the construction team, provide the specifications, models and delivery dates of the materials needed in the construction site, do a good job in the acceptance visa and management of the on-site materials, handle the acceptance visa and engineering quantity visa of the concealed works in time, assist the project manager in collecting, keeping and archiving the engineering data, and take an important responsibility for the progress and expenses of the on-site construction.

The builder's job is to solve the relationship between construction organization design and site at the construction site. What is in the organizational design depends on the builder to supervise, measure, write the construction log, report the construction progress and quality, and deal with on-site problems. It is the link between the engineering headquarters and the construction team.