Do I qualify as a "real estate professional" under the eyes of the IRS if my full time job is construction for a property management company?

Real property trades or businesses:

A real property trade or business is a trade or business that does any of the following with real property.

other rules under Reg 1.469-9(d)

a) more than 50% of their personal services during the tax year are performed in real property trades and businesses in which they materially participate and

b) they spend more than 750 hours of service during the year in real property trades or businesses in which they materially participate

real property trades or businesses include development, redevelopment, construction, reconstruction, acquisition, conversion, rental, operation, management, leasing or brokerage trade or business ( IRC 469(c)(7)(C)

keeping contemporaneous records is crucial should a taxpayer be challenged by the IRS.

as @M-MTax pointed out, if you are performing these services as an employee, you must be at least a 5% owner of the employer