Senior Mechanical Engineer

W3Global; San Francisco (CA); On-site; USD 150,000 - 190,000; Full time

Benefits offered by this job

Medical, dental, and vision insurance

Disability insurance

Company-paid life insurance

401(k) with company match

Paid holidays

Flexible Time Off

Career growth and professional develop

Job summary

W3Global in San Francisco, CA is seeking a Senior Mechanical Engineer to lead design of code-compliant, buildable mechanical systems for commercial construction. This hands-on role owns design execution from basis of design through permit and IFC documents, coordinating with project teams and field personnel.

You will mentor junior engineers, support QA/QC, and contribute to client and contractor discussions, with a focus on HVAC and water-side systems and adherence to California codes.

Qualifications

• 7-10 years of experience in commercial construction.
• Four-year engineering degree or equivalent experience.
• PE license preferred but not required.
• Strong knowledge of HVAC systems, equipment, installation standards, and fundamentals.
• Strong communication and interpersonal skills with clients, contractors and teams.
• Solid knowledge of California building codes and local amendments.
• Proficiency with HVAC/load calculation software (Carrier HAP, TRACE 700, EnergyPro).
• Proficiency with AutoCAD; Revit experience preferred.
• Experience with mechanical contracting or engineering consulting a plus.

Responsibilities

• Lead mechanical design execution from basis of design through permit and IFC deliverables.
• Establish system selection, equipment sizing, control intent, and documentation strategies.
• Design and troubleshoot air-side systems (VAV, DOAS, exhaust, pressurization, filtration, heat recovery).
• Design and troubleshoot water-side systems (hydronic plants, pumping, valves, coils, heat rejection).
• Coordinate with PMs, field personnel, clients and contractors; provide site support and submittals reviews.

Skills

HVAC systems

Strong communication

Team collaboration

Leadership

Education

Four-year engineering degree or equivalent experience

PE license preferred but not required

Tools

AutoCAD

Revit

Carrier HAP

TRACE 700

EnergyPro

Job description

The Senior Mechanical Engineer is a hands-on technical lead responsible for developing code-compliant, buildable, and well-coordinated mechanical designs for commercial construction projects. This position owns design execution from basis of design through permit and issued-for-construction (IFC) documents.

The Senior Mechanical Engineer will work closely with Project Managers, field personnel, clients, contractors, and engineering teams. The role also provides technical mentorship to junior engineers and helps maintain strong QA/QC standards across projects.

Key Responsibilities

• Lead mechanical design execution from basis of design through permit and IFC deliverables.
• Establish system selection, equipment sizing, control intent, and documentation strategies.
• Design and troubleshoot air-side systems, including VAV, DOAS, exhaust, pressurization, filtration, and heat recovery systems.
• Design and troubleshoot water-side systems, including hydronic plants, pumping systems, control valves, coils, and heat rejection systems.
• Apply California building codes, energy codes, AHJ requirements, and applicable local amendments.

QA/QC

• Review loads, design assumptions, duct and pipe sizing, equipment schedules, details, sequences, and system coordination.
• Perform thorough constructability and functionality reviews to ensure designs can be successfully installed and operated.
• Maintain consistent engineering and documentation standards.

Project Coordination & Field Support

• Support Project Managers with client, contractor, and engineer presentations and technical discussions.
• Participate in site walks and existing-condition investigations.
• Assist with developing and refining project scopes.
• Provide construction-phase engineering support, including submittal reviews, RFIs, and design clarifications.
• Coordinate with project teams to ensure designs integrate effectively with field installation.

Leadership & Mentorship

• Direct and coordinate project-based engineering activities involving internal and external engineering teams.
• Mentor junior engineers in engineering fundamentals, applicable codes, design judgment, and documentation quality.
• Provide engineering leadership with feedback regarding training needs, team development, processes, and technical standards.

Qualifications

• 7-10 years of experience in commercial construction.
• Four-year engineering degree or equivalent experience.
• Professional Engineer (PE) license preferred but not required.
• Strong knowledge of HVAC systems, equipment, installation standards, and engineering fundamentals.
• Strong communication and interpersonal skills with the ability to work effectively with clients, contractors, engineers, and project teams.
• Strong knowledge of California and applicable local building codes.
• Proficiency with Carrier HAP, TRACE 700, EnergyPro, or equivalent HVAC/load calculation software.
• Proficiency with AutoCAD.
• Revit experience preferred.
• Previous experience with a mechanical contractor or engineering consulting firm preferred.

Join a dynamic and innovative organization where experienced professionals work alongside industry leaders and have opportunities to grow their careers. The company promotes a collaborative, inclusive environment focused on delivering high-quality products and services while supporting employee development and long-term success.

Benefits

• Medical, dental, and vision insurance
• Disability insurance
• Company-paid life insurance
• Flexible Time Off
• Paid holidays
• 401(k) with 100% company match up to 4% of employee contributions
• Career growth and professional development opportunities