Senior Mechanical Engineer

P2S stands as a provider of professional engineering services to a broad range of markets, including higher education, healthcare, ports/harbors, industrial, entertainment, commercial, laboratories, municipal, and federal sectors. Our specialties include electrical, mechanical, plumbing, fire protection, and technology integration. Our offered services range from engineering and commissioning to construction management. With over 300 dedicated employees, P2S is an internationally recognized leader in many of the key markets we serve.

We provide a blend of innovation and technical excellence in delivering green solutions that enhance and sustain the built, natural, and social environments. Currently, we have offices in Long Beach, Seattle, Irvine, San Diego, Los Angeles, and San Jose.

Join our award‑winning team. Recognized as the "Best Place to Work" for over a decade, P2S offers a collaborative, innovative environment where your contributions make a real impact.

Employment Type:

Full-time

Work Schedule:

Hybrid - 3 days in-office, 2 days remote

Salary Range: $,000, based on experience

Career Level:

Senior

Location:

Seattle, WA;
Long Beach CA;
Irvine CA

We are seeking a Senior Mechanical Engineer with extensive experience in HVAC system design to join our engineering team. The ideal candidate will have 10+ years of experience in the design and coordination of HVAC systems for commercial, institutional, and industrial buildings. This position involves leading mechanical design efforts, managing projects from concept through construction, and collaborating closely with architects, owners, and other engineering disciplines to deliver high‑quality, coordinated designs.

The Senior Mechanical Engineer will also mentor junior staff and contribute to business development and process improvement initiatives.

• Lead and perform HVAC system design including load calculations, equipment selection, and ductwork/hydronic system layout.
• Prepare and review drawings, specifications, and technical documentation in accordance with project and code requirements.
• Coordinate designs with architectural, structural, electrical, and plumbing disciplines to ensure fully integrated building systems.
• Conduct field surveys, evaluate existing mechanical systems, and develop retrofit or upgrade solutions.
• Support project development from concept design through construction administration, including responding to RFIs and reviewing submittals.
• Collaborate with clients and project managers to define scope, schedule, and budgets for mechanical portions of projects.
• Serve as the primary client contact for project communication, technical discussions, and scope management.
• Support business development efforts by assisting with proposals, fee estimates, and presentations.
• Mentor junior engineers and designers, providing technical guidance and quality assurance reviews.
• Stay current with applicable building codes and industry standards.
• Participate in internal design reviews, QA/QC processes, and project closeout documentation.
• Stay current with ASHRAE standards, building codes, and emerging technologies relevant to mechanical system design.

• Bachelor's Degree in Mechanical Engineering.
• Professional Engineer (PE) license or ability to obtain within 12 months (required).
• 10+ years of progressively responsible experience in HVAC design within a consulting engineering or design‑build environment.
• Proficiency in Revit, AutoCAD, and HVAC load calculation software (e.g., Carrier HAP, Trane TRACE).
• Strong understanding of HVAC system types (VAV, DOAS, hydronic systems, chilled/hot water plants, VRF, etc.).
• Familiarity with energy modeling, sustainability, and LEED/ASHRAE 90.1 compliance (required).
• Excellent written and verbal communication skills; ability to lead technical discussions with clients and project teams.
• Demonstrated ability to manage multiple projects and meet deadlines in a collaborative environment.
• Project Management experience (preferred).

• Experience with healthcare, laboratory, higher education, or mission‑critical facilities.
• Knowledge of specification writing and Division…