Construction Mechanical Engineer II

Relativity Space•Long Beach, CA

8d•$104,000 - $156,000

About The Position

The Construction Mechanical Engineer II supports the design, development, and delivery of mechanical systems and infrastructure for Relativity Space’s manufacturing and office facilities. Systems include HVAC, plumbing, process gas distribution, and specialized systems such as cryogenic, high-pressure, and oxygen monitoring systems. The role performs engineering calculations, equipment sizing, load analyses, and system performance evaluations to support efficient, reliable, and code-compliant designs. The engineer develops and maintains mechanical design documentation, including AutoCAD drawings, Revit models, Basis of Design narratives, technical specifications, and as-built drawings. Working with engineering, construction, manufacturing, and facilities teams, the role coordinates systems to ensure they are constructible and aligned with operational needs. The role supports projects from concept and design through construction, commissioning, and handoff, including scheduling, budgeting, risk assessment, and documentation. Responsibilities also include reviewing consultant and vendor designs, drawings, and submittals; conducting site inspections; troubleshooting technical issues; responding to RFIs; coordinating field solutions with contractors and stakeholders; and supporting startup, testing, commissioning, and continuous improvement.

Requirements

Bachelor of Science degree in Mechanical Engineering or a related engineering field.
At least 2 years of experience in mechanical design and engineering for infrastructure, manufacturing, or commercial building systems.
Experience designing and specifying HVAC, hydronic/chilled water, plumbing, drainage, compressed air, and exhaust systems.
Experience developing Basis of Design documentation, mechanical load calculations, and equipment sizing.
Familiarity with mechanical codes and standards, including ASHRAE, Title 24, NFPA, and the Uniform Plumbing Code (UPC).
Experience creating and reviewing permit-ready mechanical drawings and specifications.

Nice To Haves

Master’s degree in Mechanical Engineering or a related field.
Engineer In Training (EIT) Certification.
LEED GA or LEED AP accreditation.
Background supporting cleanroom ventilation, specialty gas systems, or critical environment design.

Responsibilities

Support the design and development of mechanical systems, including HVAC, plumbing, process gas distribution, and specialized cryogenic, high-pressure, and oxygen monitoring systems.
Perform engineering calculations, equipment sizing, load analyses, and system performance evaluations.
Develop and maintain mechanical design documentation, including AutoCAD drawings, Revit models, Basis of Design narratives, technical specifications, and as-built drawings.
Collaborate with engineering, construction, manufacturing, and facilities teams to coordinate systems and align designs with constructability and operational requirements.
Support mechanical and plumbing projects from concept and design through construction, commissioning, and final handoff, including scheduling, budgeting, risk assessment, and documentation.
Review external consultant and vendor designs, drawings, and submittals for compliance with applicable codes, standards, project specifications, and safety requirements.
Conduct site inspections, troubleshoot technical issues, respond to RFIs, and coordinate with contractors and internal stakeholders to resolve field challenges and maintain project timelines.
Support system startup, testing, commissioning, and continuous improvement initiatives to improve facility efficiency, reliability, and maintainability.