Mechanical engineer jobs in Westmont, CA and nearby (409 jobs)

Mechanical engineer jobs within 25 miles of Westmont, CA. Nearby towns and cities are included. Distances are straight-line, not driving distances.

Counted Nov 8, 2026

Hiring at a glance

View jobs

Open jobs: 409
Employers: 155

Advertised starting pay

Average starting payUSD / year: $127,304Across 122 listings
Average starting payUSD / hour: $54.21Across 10 listings

Employer-advertised starting pay, not employee salaries. Currencies and pay periods stay separate.

Where work happens

Remote: 0%0 listings
Hybrid: 4%17 listings
On-site: 25%102 listings

Not specified: 71% (290 listings)

Employers hiring include SpaceX (20), Relativity Space (19), Antares (13).

Sources & calculation notes

These figures describe the listings on this role page at the date shown, not the whole job market. Listings can change.

Employer-listed minimums from at least 10 listings per currency and pay period. These are advertised starting amounts, not employee salaries. Jobs without a minimum and unusual amounts are excluded.

Hybrid and on-site classifications may be inferred from descriptions. Check the original ad. How we count

Mechanical engineer jobs in Westmont, CA and nearby

Within 25 miles

Save this search

Added 22 hours ago
Sr. Opto-Mechanical Engineer
Sierra Lobo, Inc.
Pasadena, CA
Added 1 day ago
RI
Staff Nuclear Engineer
Radiant Industries
El Segundo, CA
- $195,713 to $262,500 USD / year
Added 1 day ago
G
Mechanical Engineer
GPAC
Los Angeles, CA
- $85,000 to $155,000 USD / year
Bachelors Degree in Mechanical Engineering from an ABET accredited college, or equivalent
Added 1 day ago
G
Mechanical Engineer. Plumbing/Fire Protection
GPAC
Los Angeles, CA
- $85,000 to $130,000 USD / year
In this Position you’ll work as Project Engineer on industrial, educational, health care and commercial facilities projects. Your main responsibilities on HVAC, fire protection, piping,…
Added 1 day ago
G
Mechanical Engineer
GPAC
Los Angeles, CA
- $95,000 to $135,000 USD / week
In this Role you’ll work as Project Engineer on industrial, educational, health care and commercial facilities projects. Your main responsibilities on HVAC, fire protection, piping,…
Added 1 day ago
G
Mechanical Engineer
GPAC
Anaheim, CA
- $100,000 to $140,000 USD / year
Mechanical Engineer (HVAC / Plumbing / Fire Protection) | 💰 Competitive Compensation ($100K–$140K+ DOE) | Full Benefits
Added 2 days ago
Mechanical Design Engineer
Actalent
Torrance, CA
Job Title: Mechanical Design EngineerJob DescriptionThe Mechanical Design Engineer creates accurate, parametric CAD models and detailed drawings for complex manufactured hardware across…
Added 2 days ago
Mechanical Engineer II
Divergent
Torrance, CA
Added 2 days ago
J
Mechanical Engineer
Jobot
Irwindale, CA
- $105,000 to $135,000 USD / year
Added 2 days ago
Mechanical Engineer III - IV
Syska Hennessy Group
Los Angeles, CA
Added 2 days ago
Senior Mechanical Design Engineer, Controls
Varda Space Industries
El Segundo, CA
Added 2 days ago
G
Mechanical Engineer (PE) - HVAC Design
GPAC
Los Angeles, CA
- $90,000 to $150,000 USD / year
Mechanical Engineer (PE) - HVAC Design (Los Angeles)
Added 3 days ago
Mechanical Engineer
Motive Companies
Santa Monica, CA
We are seeking a Spacecraft Mechanical Engineer to join the spacecraft engineering team. This role is focused on the hands-on design, development, assembly, integration, and testing of…
Added 4 days ago
Mechanical Design Engineer w/Active TS/SCI
Columbus Technologies and Services Inc
Pasadena, CA
Added 4 days ago
Mechanical Engineer
Salient Motion
Hawthorne, CA
Added 4 days ago
Mechanical Design Engineer
Actalent
Carson, CA
Job Title: Mechanical Design EngineerJob DescriptionThis role focuses on designing and developing electromechanical products, including motors and human-machine interface components, for…
Added 5 days ago
Senior Mechanical Engineer (PE)
SST Direct
Los Angeles, CA
Superior Skilled Trades is partnered with a company seeking an experienced Senior Mechanical Engineer (PE) to join its engineering team.
Added 5 days ago
Mechanical Design Engineer
SoLa Impact
Los Angeles, CA
Model/ Z seeks an experienced Mechanical Design Engineer to support product development and the design of manufacturable solutions for modular housing production, with a focus on improving…
Added 5 days ago
Lead Mechanical Engineer - Buildings
WSP
Los Angeles, CA
WSP is currently initiating a search for a Lead Mechanical Engineer to join our Property & Buildings team in Los Angeles, CA.
Added 5 days ago
2026 Mechanical Engineer Intern - Manhattan Beach CA
Northrop Grumman
Manhattan Beach, CA
Added 5 days ago
Mechanical Engineer Intern (Summer 2027)
RTX Corporation
el segundo, CA
Added 6 days ago
Mechanical Engineer II, Tooling
Relativity Space
Long Beach, CA
Added 6 days ago
Mechanical Engineer III - Tank Development Lead
Quantum Space
Hawthorne, CA
We are seeking an experienced and highly motivated Mechanical Engineer II - Tank Development Lead to lead the design, development, integration, and testing of flight hardware for our…
Added 6 days ago
Mechanical Engineer III
Quantum Space
Hawthorne, CA
We are seeking an experienced and highly motivated Mechanical Engineer III to lead the design, development, integration, and testing of flight hardware for our next-generation spacecraft…
Added 6 days ago
Mechanical Engineer - HVAC/Plumbing - Data Centers
Black & Veatch Family of Companies
Los Angeles, CA

Fluidstack

Mechanical Engineer, Thermofluids

Austin, TX, United States
San Francsisco, CA, United States
Los Angeles, CA, United States

$210,000 to $260,000 USD / year

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Job details

Pay: $210,000 to $260,000 USD / year
Experience: 10+ years of experience in thermofluids engineering, including thermodynamic cycle modeling, heat exchanger design, and high-pressure fluid system design.
Posting language: English
Posted: Oct 29, 2026

Original job description

ABOUT FLUIDSTACK

We exist to make humanity more free. For most of human history, you farmed or you starved. Technology gave people more time for the things they wanted to do, instead of things they had to do. Powerful AI will be the biggest lever for human choice we've ever built - but only if models are aligned with what humanity actually wants. There are groups building AI who don't share these goals. Whoever deploys frontier compute infrastructure fastest will decide whether AI expands human freedom or shrinks it.

We're singularly focused on delivering 10 to 100s of GWs of compute faster than anyone else, rethinking every layer of the stack. We acquire power, design and build data centers, and operate them - with teams spanning hardware and software. Speed and scale are our key differentiators. Come be a part of building civilization-scale infrastructure for AI.

We hire people who care deeply about this problem space. If that is you, please apply!

HOW WE OPERATE

Be a barrel. Full autonomy. Own things end to end, take on scope without being asked, no permission required to operate outside your core role.
Insane urgency. We drive everything forward as fast as possible.
Reason from first principles. Challenge every assumption. Zero analogy thinking, no egos, the best idea wins.
Love of the game. The frontier of AI is the most interesting problem of our time. We put in long hours at high intensity to push the frontier forward.
Build something that actually matters. If you're going to spend your time, spend it on something that matters to the world.

THE THERMOFLUIDS R&D TEAM

Examples of key problems the team is working on

Reject 10s of GW of heat, starting now. Fluidstack is targeting 10s of GW of compute over the next two years. Every watt of it becomes heat that has to go somewhere, and no cooling team has ever been asked to open at that scale rather than grow into it.
Design and build the machines, because nobody can supply them. The merchant compressor market cannot deliver at this rate, and the vendor base behind today’s chillers will not scale to gigawatts. We are taking compressor and chiller design in house, working on machine architectures nobody sells today, and going from blank sheet to production faster than this industry thinks is possible.
Own every thermofluids problem behind the fleet, not just the chiller. Working fluid and cycle architecture, heat exchangers at a scale that dominates the cost of the plant, two-phase heat transfer at the chip, and thermal energy storage. All of it is open, and whatever this team lands gets built thousands of times.

ROLE SCOPE

Define what the machine has to be, owning the cycle model that sets the working fluid and the pressures, temperatures and flows the compressor, turbine and exchangers are designed against.
Design heat exchangers with surface areas running into millions of square meters, among the largest single drivers of a data center’s physical footprint.
Design the fluid system around the machine: piping, valves, headers, relief and isolation, sized against the pressure-drop budget the cycle can afford and the pressures the fluid actually runs at.
Run the trades that decide the machine: air-side temperature rise, face velocity and subcooling. Derive the operating points from coupled exchanger ratings rather than asserted approach temperatures, so infeasible designs get caught in the model instead of in hardware.
Take the cycle predictions onto the test stand and reconcile them against measured COP, then say plainly where the model was wrong.

WHAT WE'RE LOOKING FOR

The below is a starting point. We always make space for exceptional people, so if you don't fit this role exactly, tell us where you would https://jobs.ashbyhq.com/fluidstack/05c2e69c-42f9-4fcb-9cf0-a467aaf98f1c.

10+ years of experience in thermofluids engineering, including thermodynamic cycle modeling, heat exchanger design, and high-pressure fluid system design.
You’ve built a thermodynamic cycle model from fluid properties up and defended its assumptions to someone actively trying to break it.
You’ve sized real heat exchangers against published correlations, and you’ve caught a case where the correlation belonged to a different geometry than the one in front of you.
You’ve calibrated a model against a machine datasheet or test data and reported the gap honestly rather than tuning until it disappeared.
You’ve written the analysis that changed a design decision, in a form that people who never ran the code could read and act on.
You’ve sized a relief path and been the one who signed off that the system was protected.
You’ve held a result open when it was still open, instead of closing it early to be helpful.
You're comfortable with regular travel: expect 25% or more, depending on business needs.
Most of our engineering team, stakeholders, and work are based in Austin, TX, and we value working in person. We have a strong preference for Austin and run a hybrid model, but we're open to other locations for the right role and candidate.
Bonus: Vapor-compression and transcritical cycles (chillers, heat pumps, refrigeration). Propulsion and cryogenic fluid systems (feed systems, regenerative cooling, two-phase transport). Piping and relief design for high-pressure fluid systems. Real-gas properties and two-phase heat-transfer correlations (CoolProp, REFPROP, Cavallini, Gnielinski, Wang). Data center thermal architecture (CDUs, dry coolers, direct-to-chip).

We are committed to pay equity and transparency.

Fluidstack is an Equal Employment Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, national origin, sexual orientation, gender identity, disability and protected veterans’ status, or any other characteristic protected by law. Fluidstack will consider for employment qualified applicants with arrest and conviction records pursuant to applicable law.

Applicant Privacy Notice https://fluidstack.io/legal/applicant-privacy-notice AI Screening Notice https://fluidstack.io/legal/ai-screening-notice Ashby Bias Audit https://fluidstack.io/legal/ashby-bias-audit

You will receive a confirmation email once your application has successfully been accepted. If there is an error with your submission and you did not receive a confirmation email, please email careers@fluidstack.io with your resume/CV, the role you've applied for, and the date you submitted your application-- someone from our recruiting team will be in touch.

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