Senior Prototype Design Engineer: Hardware-UX Prototyping

42dot Inc.; Sunnyvale (CA); On-site; USD 167,000 - 231,000; Full time

Job summary

42dot Inc. in Sunnyvale is seeking a Senior Prototype Design Engineer to bridge Industrial, Mechanical, and UX design for advanced vehicle experiences. You will transform abstract concepts into high-fidelity prototypes that validate feasibility and accelerate decision-making for future mobility.

You are a builder who can master new skills quickly, collaborating across disciplines to test hardware‑software convergence, ergonomics, and user journeys in in-vehicle contexts.

Qualifications

• Bachelor’s or Master’s in a technical field required.
• 6+ years in product design, engineering, or rapid prototyping.
• Proficiency in Figma, Protopie, vibe coding, Arduino, and CAD.
• Experience bridging ID, MD, and UX for vehicle experiences.

Responsibilities

• Transform concepts into high-fidelity prototypes for feasibility tests.
• Bridge Industrial, Mechanical, and UX design across programs.
• Collaborate with software to validate in-vehicle interactions.

Skills

Prototype design

Hardware integration

UX design

Rapid prototyping

Education

Mechanical Engineering

Industrial Design

HCI

Tools

Figma

Protopie

Vibe coding

Arduino

CAD tools

Job description

42dot Inc. in Sunnyvale is seeking a Senior Prototype Design Engineer to bridge Industrial, Mechanical, and UX design for advanced vehicle experiences. You will transform abstract concepts into high-fidelity prototypes that validate feasibility and accelerate decision-making for future mobility.

You are a builder who can master new skills quickly, collaborating across disciplines to test hardware‑software convergence, ergonomics, and user journeys in in-vehicle contexts.