Job Description

Mechanical Design Engineer (Project Engineer)

Location: Collinsville, OK

Compensation:

• $100K–$130K based on experience

• Bonus: Performance-based (measured by design KPIs)

About the Opportunity

LHH is partnering with a fast-growing engineering and manufacturing organization on a critical search for a Mechanical Design Engineer to join their collaborative team in Collinsville, OK. This role is focused on the technical design and development of industrial steam boiler systems , specifically the Firetube product line. With a legacy of high-quality engineering, our client is scaling operations and investing heavily in product innovation and design infrastructure.

This is a hands-on, project-based role requiring strong proficiency with ASME Section I and Section VIII pressure vessel design, mechanical calculations, and CAD tools such as SolidWorks and Inventor. Candidates with a background in boilers, pressure vessels, HRSG systems, or heat exchangers will find this opportunity an excellent fit for their technical experience and growth ambitions.

Key Responsibilities

• Design and develop custom-engineered firetube boilers, pressure vessels, and related combustion equipment per ASME Section I and Section VIII

• Perform mechanical calculations using spreadsheets and formula-based code compliance tools

• Generate technical documentation and 3D models using SolidWorks and AutoCAD/Inventor

• Lead troubleshooting efforts for shop and field issues, identifying root causes and implementing corrective design updates

• Collaborate cross-functionally with Sales, QA, Purchasing, Production, and Aftermarket teams

• Support ongoing engineering improvement initiatives and product development

• Assist with QA/QC documentation updates and engineering standardization efforts

Must-Have Qualifications

• 3+ years of experience designing boilers, pressure vessels, HRSG systems, or heat exchangers

• Strong knowledge of ASME Section I (boilers) and/or Section VIII (pressure vessels)

• Bachelor’s degree in Mechanical Engineering or related field

• Proficiency with SolidWorks and/or Inventor CAD platforms

• Familiarity with combustion equipment: wind box burners, gun-type burners, scroll burners

• Ability to interpret and validate engineering spreadsheets and design calculations

• Strong communication skills and collaborative mindset

Preferred Qualifications

• 5+ years of experience in boiler/pressure vessel design

• Experience with NFPA codes and pressure combustion systems

• Supervisory experience in an engineering or drafting team

• Professional Engineer (PE) license in Mechanical or Structural discipline

• Experience with Inventor (direction of future CAD environment)

• Knowledge of ISO 9000

• Experience with pressure combustion and ancillary equipment

Work Environment & Culture

• Onsite M–F, 8:00 AM–5:00 PM

• Travel is minimal

• Highly collaborative engineering and drafting team

• Opportunity to shape the future of the product line during a high-growth period

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