PAY BASED ON EXPERIENCE. Entry-Level Mechanical Designer / Draftsman. Phillipsburg, NJ. |. On-site. |. Full-time. About G.J. Oliver, Inc. G.J. Oliver, Inc. is a global leader in the design and manufacture of custom steel fabrications, ASME pressure vessels, API-class equipment packages, and auxiliary support systems. Our engineered systems support a wide range of industries and include. Oil and Gas. Petrochemical and Chemical Processing. Power Ge...