Mechanical Engineer, HVAC

Why join Giga The Pace: We're building at a speed most companies talk about but never actually operate at. If you've been bored somewhere else, you won't be here. The Impact : Every person at Giga touches the work that matters. No layers, no waiting for approval chains. You'll see your fingerprints on what we ship. The Team: A team of operators defining the future of AI infrastructure. We recruit A-players from the most innovative companies in the world, and they choose Giga because the work here means more. The Moment : AI doesn't run without power, and that's us. Giga is the picks and shovels behind the AI revolution. This industry is about to explode, and you'll be in the room where it's already happening. What you’ll do As a Mechanical Engineer at Giga, you will own HVAC and mechanical system design for AI data center infrastructure from early concept through construction documents. That means load calculations, equipment selections, hydronic system modeling, ductwork and piping sizing — the full scope. You won’t be reviewing someone else’s work; you’ll be producing it. If you’re the kind of engineer who wants to see your designs actually get built — and built fast — this is the role. Where you’ll work This role is based out of one of our offices (San Francisco, CA / Long Beach, CA / Houston, TX). We work in person because the best engineering happens when smart people are in the same room. Responsibilities Lead detailed HVAC mechanical design for mission-critical data center facilities, from schematic design through construction documents Perform load calculations, psychrometric analysis, ductwork sizing, piping sizing, and equipment selections Model and analyze hydronic systems using PipeFlo or equivalent software Develop system models and energy analyses using Trane Trace, Carrier HAP, or similar tools Produce design documentation in AutoCAD and Revit MEP, maintaining coordination-ready models throughout design phases Apply ICC/UPC codes and applicable ASHRAE standards to ensure compliant, optimized designs Collaborate with other disciplines to integrate mechanical systems into the broader facility design Interface with equipment vendors and contractors to validate selections and support procurement Support construction administration, RFI responses, and submittal reviews Requirements Bachelor’s degree in Mechanical Engineering 3–5 years of professional HVAC design experience Proficiency in AutoCAD and Revit MEP for system design and modeling Proficiency in Trane Trace, Carrier HAP, or similar load calculation software Proficiency in PipeFlo or similar hydronic system modeling software Strong working knowledge of ICC/UPC codes and ASHRAE standards (62.1, 90.1, 90.4, and related) Demonstrated competence in load calculations, psychrometrics, piping and ductwork sizing, and equipment selection Bonus Points Knowledge of mechanical cooling topologies used in data centers: CRAC/CRAH units, chilled water plants, air-cooled chillers, water-side and air-side economization, and evaporative/adiabatic cooling Familiarity with high-density and liquid cooling approaches (direct liquid cooling, rear-door heat exchangers, immersion cooling) Experience with hydronic system design including primary/secondary loops, variable flow systems, and plant sequencing Experience reviewing or performing CFD analysis for airflow and thermal modeling Understanding of how mechanical systems integrate with electrical infrastructure (UPS, generators, switchgear) Commissioning experience — FAT, SAT, or functional performance testing Bonus Points Professional Engineer (PE) license, or actively pursuing licensure Experience authoring design narratives and basis-of-design documents and presenting them to clients or stakeholders Benefits Subsidized health, dental, and vision insurance Equity (options) in a rapidly growing startup 401(k) with 4% employer match Unlimited PTO Parental leave Healthcare and Dependent Care Flexible Spending Accounts (FSA) or Health Savings Account (HSA) Commuter benefits Pay Transparency The range provided below is the role’s On Target Earnings ("OTE") range, meaning it includes both the commission / bonus target and annual base salary for the role (if applicable). This salary range may be inclusive of several career levels at Giga and will be narrowed during the interview process based on a number of factors, including the candidate’s experience and qualifications. Additional benefits include 401(k) plan plus subsidized medical, dental, and vision benefits. Salary Range $90,000 — $122,000 USD Who we hire We hire people who thrive in chaos and get sharper under pressure. You don't wait to be told what to do, you spot the gap and fill it. When there's work to be done, you do it. You make decisions with the information you have, move fast, and adjust along the way. We're not looking for perfect; we're looking for people who get things done. Equal Opportunity Employer Statement Giga Energy is an equal opportunity employer and is committed to fostering an inclusive and diverse workplace. We do not discriminate based on race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability, veteran status, or any other protected characteristic as outlined by federal, state, or local laws. Giga Energy complies with all applicable labor laws, including the California Fair Employment and Housing Act (FEHA) and other relevant state and federal regulations. We provide reasonable accommodations for qualified individuals with disabilities and encourage applicants who require accommodations during the hiring process to contact us.