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Posted August 19, 2026

Mechanical Engineer, Mid-Sr. (35660)

STSI (Staffing Technical Services Inc.)
Billings Metropolitan Area, MT, US Full Time

Job Description

Job Description
Mechanical Engineer
Location: Billings, Montana
Target Rate: $55.00-$85.00 per hour

Job Summary
This is a Mid-level or Senior-level Mechanical Engineer position with experience in the Oil and Gas industry.

Responsibilities and Duties
  • Prepare detailed design of projects in compliance with governing codes, regulatory requirements, and client standards.
  • Develop project scope definition for project proposals and awarded work.
  • Solve problems by using a combination of standard procedures, modification of standard procedures, or methods developed in previous assignments.
  • Complete and coordinate independent studies, analyses, interpretations and conclusions.
  • Give technical guidance to junior engineers
  • Ability to status project and track progress against schedule and budgets.

Required Skills and Abilities
  • Experience developing and approving pipe specifications.
  • Strong experience in design, specification, application, and modification of rotating and fixed equipment, such as:

‑ Pressure vessels
‑ Heat exchangers
‑ Pumps
‑ Compressors
‑ Turbines
  • Experience in:
‑ Equipment drawing review and approval
‑ P&ID development and review
‑ Material selection
‑ Piping layout
‑ Pipe Stress Analysis.
  • Strong working knowledge of ASME pressure vessel and piping codes, API and other industry standards.
  • Excellent verbal and written communication skills.
  • Understanding of inter-discipline requirements
  • Strong organizational skills.
  • Strong understanding of consultant engineering workflow and project execution.
  • Strong computer skills - Microsoft Applications (Word/Excel) and engineering software programs, such as CAESAR II, COMPRESS, and FEA programs.
  • Capable of some travel and remote site assignments.
  • Applicants must be able to obtain a TWIC card.

Education and Experience
  • B.S. in Mechanical Engineering from ABET accredited university or equivalent
  • 8+ years engineering experience – preferably in the petrochemical industry with a strong background in Oil and Gas Production and Refining, Gas Compression and Transmission.

Physical Requirements
  • Able to sit/stand for long periods of time.
  • Must be able to lift up to 15 pounds at a time
  • Field trips to job sites (local and/or remote) will be required, so applicant must be open to travel and site assignments.

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