{"id":1879946,"url":"https://alion.io/job/mesa-associates-inc-principal-mechanical-engineer","title":"Principal Mechanical Engineer","company":{"id":2305500,"name":"Mesa Associates","domain":"mesainc.com","url":"https://alion.io/company/mesainc","size_band":"1001-5000","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"UltiPro","truth_index":null},"role":"Industrial Engineering","role_family":"Industrial Engineering","seniority":"lead","employment_type":"full_time","work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Knoxville, United States"],"countries":["US"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":102000,"max_usd":206000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":1829},"experience_years_min":15,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"AutoCAD","optional":false},{"name":"SolidWorks","optional":false}],"status":"live","first_seen_at":"2026-09-22T19:15:54Z","employer_posted_date":"2026-09-22","last_verified_at":"2026-10-22T04:09:53Z","board_verified":true,"closed_at":null,"days_open":29,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":29},"description":"GIG - General / Generation, Industrial & Govt\nDisclaimer: Be cautious and only respond to emails from our “mesainc.com” domain. We will never ask for sensitive information, such as bank account details, SSN, etc., via email. If you receive any communication asking for such information, it is not from Mesa. For any concerns, or to verify the authenticity of a message, please contact us through our official channels.\nWe’ve got the power to energize your career and spark YOUR work/life balance through professional development and exceptional benefits. Don’t delay, plug in today for an inclusive and meaningful career. Mesa Associates, Inc. is a woman/minority-owned full-service engineering, procurement, and project management firm covering power, defense, aerospace, industrial, commercial, and municipal entities. We specialize in power generation and delivery services. We have been in the top 10 of EC&M's Top 40 Electrical Design Firms since 2012. With over 1,000 associates, we are big enough to perform, but small enough to care!\nMesa Associates is seeking a Principal Mechanical Engineer to serve as the senior advisor for our Piping & Pressure Systems practice, delivering projects for our Generation, Industrial, and Government clients. This role is centered on review and guidance rather than day-to-day design production: you will bring deep piping and pressure vessel expertise and strong power industry experience to catch issues, verify code compliance, and steer engineers across the department toward sound technical decisions, rather than producing the bulk of the designs yourself. We're looking for someone who leads by example, communicates clearly, and genuinely enjoys helping others get it right.\nCore Competency: Piping & Pressure Systems Design\nWhat We're Looking For\nExpert knowledge of mechanical design codes including ASME, ANSI, API, and NFPA, with deep specialization in ASME B31.1/B31.3 piping codes and ASME Boiler & Pressure Vessel Code Section VIII, API 650, and API 620\nExtensive, well-rounded experience across piping and pressure vessel design for the power industry specifically, including coal, gas, and hydro generation, gained over a long career in the field\nSharp eye for identifying design errors, code gaps, and constructability issues in piping and pressure vessel calculations, drawings, and specifications produced by others\nStrong background in stress analysis of piping systems, custom piping components, and fabrication assemblies, with knowledge to check work performed using AutoPIPE and/or Caesar II\nWorking knowledge of pressure vessel and tank design fundamentals, including nozzle loading, wall thickness, and code stamping requirements, sufficient to independently verify others' calculations\nComfortable reading and checking Plant3D, AutoCAD, MicroStation, and SolidWorks piping isometrics, layouts, and 3D models produced by the team\nRecognized depth of experience across a wide range of piping and pressure vessel project types, serving as a natural go-to resource for the department \nWhat You'll Do\nServe as the technical checker for piping and pressure vessel designs, calculations, and drawings produced by the team, verifying code compliance and engineering accuracy before issue\nReview and check detailed stress analysis and pressure vessel calculations for major projects\nAdvise engineers on piping and pressure vessel code questions, design approach, and problem-solving throughout the project lifecycle\nPerform independent spot checks and occasional walkdowns to verify field conditions match design assumptions\nWeigh in on complex or unusual piping and pressure vessel challenges where deep power industry experience is needed\nStamp piping and pressure vessel deliverables as the reviewing engineer of record where appropriate \nSecondary Experience: HVAC Systems\nWhat We're Looking For\nWorking knowledge of industrial HVAC design fundamentals, including load calculations, ductwork sizing, and equipment selection\nComfortable reading and reviewing HVAC drawings and specifications, particularly where they intersect with piping and pressure system scopes, such as chilled water or steam and condensate piping \nWhat You'll Do\nReview and advise on HVAC-related scopes when they intersect with piping and pressure system design, such as chilled water and steam/condensate piping\nCoordinate with the department's HVAC and utility systems engineers on shared scopes as needed \nLeadership & Team Role\nServe as the most experienced technical resource in the Piping & Pressure Systems practice, checking work and providing guidance to engineers at every level of the department\nReview and advise on the team's deliverables as the primary focus of the role, rather than producing the bulk of the designs directly\nMentor piping-focused engineers, offering coaching on code compliance, stress analysis, and design practices\nCheck deliverables across the department and offer constructive, practical feedback\nSupport proposal development and client-facing technical discussions for piping and pressure vessel scopes\nSet a strong example of collaboration, accountability, and a positive attitude that the rest of the team can learn from \nQualifications\nBachelor's degree in Mechanical Engineering and PE License (required)\n15+ years of experience in piping design and pressure vessel engineering, with strong, direct experience in the power industry\nA track record of checking, reviewing, and improving the work of other engineers, in addition to strong personal technical ability\nA track record of coaching and developing engineers at multiple experience levels\nStrong written and verbal communication skills with internal and external clients\nWell organized, detail-oriented, and quick to spot issues and offer practical solutions\nA collaborative, team-first mindset and a genuine willingness to help wherever needed \nWhat You’ll Earn\nPaid Time Off\nHoliday Pay - 10 Days Annually\nGroup Medical/Dental Insurance\nLife Insurance (Company Paid)\nDisability Insurance (Company Paid)\n401(K) Retirement Savings plan\n401(K) Matching Contribution\nSection 125/Cafeteria Plan\nLong Term Care Insurance\nTuition Reimbursement\nFitness Center Reimbursement\nAnnual Performance Bonus\n9/80 Work Schedule Option\nFSA and HSA Options \nNotice to External Search Firms: Mesa Associates, Inc. and its subsidiaries do not accept unsolicited resumes and will not be obligated to pay a placement fee for unsolicited resumes. Mesa Associates, Inc. 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