Skip to content
CV Rocket
Get started
How it worksThe enginePricingBlogContactSign in

Open nowPosted 18 days ago

Senior Mechanical Engineer at Arn Autonomy

Cox Exponential11 open roles

Pay
$90,000 – $165,000 a year
Where
South San Francisco
Work mode
On site
Get the CV for this job

From $25 per CV, paid once. No subscription.

Your applicationOpen nowSenior Mechanical Engineer at Arn AutonomyCox Exponential · South San Francisco

  1. YouYes, apply to this one.

  2. CV RocketCV written for this posting.

  3. 25 readersRecruiter, hiring manager, skeptic. Round after round.

  4. CV RocketApplied on Cox Exponential's own form.

The reply lands in your private mailbox

3×more interviews than doing it yourself with ChatGPT.

The clock on this job

Early applications get read.

12.9% of postings close within 7 days. Measured by our own scanner across the market.

Share of postings closed within
  1. 2.2%1 day
  2. 4.7%3 days
  3. 12.9%7 days
  4. 21.0%14 days
  5. 35.6%30 days
  6. 58.5%60 days
This job: posted 18 days ago

The posting

Senior Mechanical Engineer

About the Company

Arn Autonomy is building autonomous, non-humanoid robotic systems to construct infrastructure in extreme, unstructured environments, starting with next-gen construction job sites. Our vision is to disrupt the $16 trillion global construction industry by pioneering a new Deep Tech philosophy that blends robotics, AI, and systems engineering at the frontier. Our flagship product, GRID, is an autonomous rebar-tying robot deployed with rebar and concrete contractors on live job sites.

About the Role

We're seeking a Senior Mechanical Engineer to join the team building GRID, our rebar-tying mobile robot, and to mentor colleagues on mechanical and electromechanical design. This is a hands-on, cross-disciplinary role spanning mechanical design, electromechanical integration, prototyping, and system-level testing on real hardware. You'll work on the tying mechanism, gantry, chassis, and powertrain, and partner closely with our software, electrical, and manufacturing teams to turn them into a working, testable robot. As an early hire, you'll help shape how we design, build, and validate hardware for field deployment and higher-volume manufacturing.

Responsibilities

Mechanical & Electromechanical Design: Design and specify the mechanisms, gantry, chassis, and actuators for a mobile robot operating in outdoor construction environments. Design for durability, serviceability, and performance across outdoor temperatures, dust, vibration, and weather Powertrain Design: Size and select electric motors and gearboxes from vehicle-level requirements such as payload, speed, slope, duty cycle, and torque margins Terrain Performance: Analyze and validate how the chassis behaves on uneven ground, including gaps and holes in rebar mats and decks (stability, ground clearance, wheel or track geometry, loads on the frame) Electromechanical Integration: Integrate motors, sensors, bearings, cabling, and power transmission into robust, field-ready assemblies, using both off-the-shelf and custom components Manufacturing Documentation: Turn 3D models into complete drawing packages for machined parts (GD&T, materials, finishes, inspection requirements), and design parts for 3D printing where appropriate Prototyping & Validation: Build and instrument prototypes and test setups. Optimize chassis and structural components for strength and stiffness, and run structural analysis (hand calcs and FEA) on critical load-bearing components to validate designs under real operating conditions System-Level Testing & Root Cause Analysis: Plan and run system-level tests on GRID; commission, operate, and troubleshoot mechanical subsystems. Identify likely root causes of system issues and failures, and engage the responsible team to drive resolution Cross-Functional Collaboration: Work closely with software, electrical, and manufacturing partners; take ownership of specific design and test tasks and bring your expertise to troubleshoot issues as they arise Mentorship & Design Guidance: Mentor and support colleagues on mechanical and electromechanical design, including design reviews and good practice in CAD, drawings, and tolerancing Manufacturing Readiness: Lead DFM/DFA efforts for machined, 3D-printed, and welded parts, and build test fixtures and procedures to scale toward field deployment and higher-volume production Documentation & IP: Document designs, test procedures, and results for traceability and knowledge sharing; contribute to patent work, including invention disclosures and prior-art review

Required

5+ years of professional experience in mechanical engineering, robotics, or electromechanical systems, including shipping real hardware to customers or into the field Hands-on experience designing electromechanical assemblies (motors, actuators, gear trains, bearings, sensors, cable routing) for mobile platforms, including sizing electric motors and gearboxes from system requirements such as payload, speed, slope, and duty cycle Proficiency with at least two CAD packages (for example CATIA, SolidWorks, Fusion, or similar), with strong GD&T and tolerance-stack fundamentals Experience turning 3D models into complete drawing packages for machined parts, plus BOMs, specifications, and engineering change documentation; practical knowledge of CNC machining and 3D printing and when to choose each Structural analysis skills: comfortable sizing components by hand calc, knowing when to run FEA, and optimizing structures for strength and stiffness Experience taking hardware from prototype through design validation and low-volume production, with strong hands-on prototyping, debugging, and testing skills Experience mentoring or guiding less experienced engineers, for example through design reviews or day-to-day technical guidance. Formal management experience is not required This is an in-person role, five days a week, in the San Francisco Bay Area. You must be based in the Bay Area or willing to relocate.

Preferred

Experience with mobile or outdoor robotic platforms (AMRs, construction or ag equipment, off-road vehicles), including an understanding of how wheeled or tracked chassis behave over uneven terrain with gaps and holes Experience with strength-optimized structures (topology optimization, load path design, high-strength aluminum and steel alloys, composites) Experience reading and interpreting patents; named inventor on patents is a plus Experience with IP-rated enclosures for outdoor, dusty, or wet environments, and with reliability testing and failure analysis Experience owning supplier relationships for machined parts or weldments, and working in a fast-paced, early-stage startup

Compensation & Benefits

Salary range: $90,000 - $165,000, depending on experience, plus equity. Pay offered may vary depending on multiple individualized factors, including market location, job-related knowledge, skills, and experience. The total compensation package for this position may also include other elements depending on the position offered; details will be provided if you receive an offer of employment. We're a startup moving fast, and being in the room together is how we build. Daily lunches Flexible PTO Kaiser Gold HMO health plan Pet Friendly Arn Autonomy is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, gender identity or expression, sexual orientation, national origin, age, disability, veteran status, or any other characteristic protected by applicable law.

From $25, paid onceGet the CV for this job

What happens when you press

One press. We do the rest.

  1. A CV for this posting

    Written against Cox Exponential's own wording, from every piece of relevant proof in your profile.

  2. 25 readers review it

    Recruiter, hiring manager, skeptic and more read every draft, round after round. You get the best round.

    The review screen in CV Rocket: how each CV was read, round by round.

  3. We apply on Cox Exponential's form

    Our application engine gets through the hardest forms there are. Where a question needs you, AI suggests the best answer. Don't want us applying from our IP addresses? Use our Chrome extension: we apply straight from your own browser.

    An application in CV Rocket: every answer filled in on the employer's form.

  4. Every reply, sorted

    Cox Exponential's answer lands in your private mailbox, and we classify it on arrival: interview, question, rejection.

    The CV Rocket inbox: each employer reply classified as an interview, an action or a rejection.

  5. Reply with AI

    AI helps you write the email, checks it and sends it. We show you whether the recruiter read it.

  6. The interview in your calendar

    Full integration with your calendar. The invitation goes straight in.

    An interview invitation in the CV Rocket inbox, added to the candidate's calendar.
Get the CV for this job

From $25 per CV, paid once. No subscription.

Why it works

3×

more interviews than doing it yourself with ChatGPT.

ChatGPT writes a CV and never learns what happened to it. We see every reply. For each CV we know:

  • How it was written, and how the review scored it
  • When we applied, and how long after the posting went up
  • Which posting, which company, which city
  • Who got the interview, and who heard nothing

That is how we know which CVs get called.

Get the CV for this job

From $25 per CV, paid once. No subscription.

The numbers game

More applications. More interviews.

Every application goes out with its own CV, written for that posting and paid once. Send enough of them and the law of large numbers finds you the job.

Get the CV for this job
By hand5–10
With CV Rocket100
applications a day

Nearby

Live postings like this one

Same employer first, then the same role elsewhere.

Before you press

Straight answers

Get the CV for this job

From $25 per CV, paid once. No subscription.

What if my background isn't good enough?

We make the most of the background you have. The CV uses every piece of relevant proof your profile holds, and one of the 25 readers reads your whole profile and flags what the CV left out.

Do you really apply for me?

Yes, on the employer's own form, the hardest ones included. Where a question needs you, you answer it right there and AI suggests the best answer. Don't want us applying from our IP addresses? Use our Chrome extension: we apply straight from your own browser.

Is it a subscription?

No. You pay once per CV, from $25. Every application goes out with its own CV, written for that posting.

One job. One CV.
Paid once.

Pick the posting you want. We write for it, apply for you and catch the reply.

Get the CV for this job

From $25 per CV, paid once. No subscription.