J. F. Ahern Co.

Feb 26, 2026
Full time
J. F. Ahern Co. Appleton, WI, USA
Looking for a company that values your skills, respects your contributions, and gives you the tools to thrive? With more than 145 years as a family-owned business, we've built a reputation as one of the best mechanical and fire protection contractors in the country. We pride ourselves on delivering unmatched quality and innovation while providing you with job stability, opportunities for career progression, and support. We have an exciting opportunity for a Engineer, Sr. located in Appleton, WI. How you will contribute: As a Plumbing Engineer, you will prepare detailed designs for plumbing, medical gas, and compressed air systems. You will perform code analysis, system calculations, material sizing, and equipment selection. You will also provide information to our estimating team relative to bid packages and provide engineering input into the operation plans for system commissioning and start-up. You will play a lead role in customer interactions and site visits to understand...
Jan 18, 2026
Full time
J. F. Ahern Co. Milwaukee, WI, USA
Looking for a company that values your skills, respects your contributions, and gives you the tools to thrive? With more than 145 years as a family-owned business, we've built a reputation as one of the best mechanical and fire protection contractors in the country. We pride ourselves on delivering unmatched quality and innovation while providing you with job stability, opportunities for career progression, and support. We have an exciting opportunity for a Sr. HVAC Engineer located in Milwaukee, WI. How you will contribute: As a Senior Engineer, you will prepare detailed designs for HVAC, steam, and industrial process piping projects. You will perform HVAC and piping system load calculation, equipment selection, ductwork and pipe sizing, control sequence creation, and specification development. You will also provide information to our estimating team relative to bid packages and provide engineering input into the operation plans for system commissioning and start-up. You...