Senior Mechanical Project Engineer

Mantis Innovation•Seattle, WA

1d•Hybrid

About The Position

Mantis Innovation provides managed facility services and turnkey program management using technology-enabled solutions across building systems and operations. The Senior Mechanical Project Engineer helps clients identify, design, and implement utility and infrastructure improvements, translating complex facility needs into practical projects that improve performance, reliability, and cost efficiency. The role leads technical assessments, feasibility analysis, project scoping, and engineering design to support investment decisions and provides engineering support from concept through implementation. Success includes completing 95% of assigned site surveys, feasibility studies, and investment-grade cost estimates by their committed deadlines, with less than 5% requiring material rework due to engineering errors or omissions. The engineer develops scopes, project economics, and recommendations that contribute to at least $5 million annually in qualified project opportunities approved for proposal or implementation, while collaborating reliably with clients, internal teams, and project partners. The work is performed in a combination of office, remote, and client-site settings. Client sites may include industrial facilities, commercial buildings, utility plants, mechanical rooms, construction sites, production areas, and rooftops. Regular local and regional travel is expected, with occasional overnight travel. Work is generally during standard business hours, with flexibility potentially needed for client schedules, site access, deadlines, commissioning, or field work outside normal hours.

Requirements

Bachelor’s degree in engineering or a related technical field.
5–10 years of experience in development, design, or delivery of utility system modernization, energy-efficiency, or related infrastructure projects.
Experience supporting industrial and/or commercial projects.
Technical experience with utility, HVAC, mechanical, or related infrastructure systems.
Ability to independently manage engineering work and coordinate with clients, internal teams, and external partners.
Strong financial and economic analysis, including lifecycle cost analysis, ROI evaluation, and development of business cases for capital infrastructure improvements.

Nice To Haves

PE license, Certified Energy Manager credential, LEED AP credential, or similar professional certification.

Responsibilities

Conduct site surveys and collect technical, operational, utility, and cost data to establish project baselines and identify client needs.
Analyze facility infrastructure, utility systems, and operating conditions to identify energy, water, and operational improvement opportunities.
Perform feasibility studies and technical evaluations for utility modernization and energy-efficiency solutions.
Develop project scopes, engineering assumptions, savings calculations, and investment-grade cost estimates.
Prepare technical recommendations, project economics, and supporting documentation for client proposals and decision-making.
Lead design engineering activities for approved projects, ensuring technical quality and alignment with project objectives.
Coordinate internal and external engineering resources to deliver design work on schedule and within scope.
Manage engineering support for project implementation, including design-build coordination, technical reviews, and integration of applicable incentives or funding opportunities.