"Consulting firm" is often used as a generic term for any company you hire to do business work for you. For example if you need a mobile app and hire a company

"Consulting firm" is often used as a generic term for any company you hire to do business work for you. For example if you need a mobile app and hire a company that specializes in building mobile apps for their clients, there's a good chance the contract will say "consulting agreement" across the top. But, in general conversation among technologists, those are more often called vendors, or contracting firms, or agencies. When it's an individual person, the label usually depends on their role: consultant has some ownership of the result (in theory), contractor does skilled labor as assigned, temp does less skilled labor as assigned, intern, etc.