Design Engineer (Intern)

SubstrateSan Francisco, California, United States
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Posted

9/18/2026

Employment

Full time

Range

$70k - $120k/year

Work style

Hybrid

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AI summary

Core responsibilities

You will own the full product arc from customer pain points and UI/UX design to prototyping and production deployment. Additionally, you will write growth-optimized product copy and help build a product culture that balances speed, taste, and customer obsession.

Requirements overview

Candidates should have a strong portfolio demonstrating UI/UX design taste and proficiency in tools like Figma or Lovable. You must be a skilled writer who is comfortable with full-stack engineering concepts and can commit to an 8-month or longer internship.

Key skills

UI/UX DesignFull-stack EngineeringProduct DesignCopywritingPrototypingFigmaLovableLLMsProduct DevelopmentCustomer DiscoveryTechnical Writing

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Job categories

EngineeringTechnologySoftwareArt & DesignManufacturing

Description

BACKGROUND Substrate builds financial infrastructure to grow industrial GDP. We're hiring a Design Engineering Intern to help make Substrate's products look and feel insanely great. You'll work at the intersection of design, product, copywriting, and full-stack engineering, shipping 0→1 experiences that power machine shops, farms, factories, construction contractors, and more. Substrate engineering interns have immense ownership to lead full-stack product cycles end-to-end, from customer discovery to production deployment. You'll get to occasionally travel with the founder to factory floors, meet Main Street manufacturers and Wall Street lenders face-to-face, and build exactly what the field demands. Given the design complexity of our product and the high degree of ownership we trust interns with, we've found engineers typically take 6-8 weeks to fully onboard and lead their own projects. Therefore, we strongly prefer candidates who can commit to an 8-month+ internship. We occasionally make exceptions for those who are truly exceptional. WHY CONSIDER SUBSTRATE AMIDST YOUR SEA OF OPTIONS: * You believe in objective good and beauty, and you want to bring them to an antiquated, predatory industry. * You believe not all technology is created equal. You don’t care about building another enterprise SaaS tool, you want to build tools that advance civilization. * You want to work with people who treat their work as craft, who violently reject “just good enough,” and you want to help build that culture. WHAT YOU’LL DO: * Own the full arc: from customer pain → UI/UX design → prototype → shipped product * Design and build beautiful, simple interfaces on top of gnarly complexity and legacy systems * Write growth-optimized product copy that converts users across the product funnel * Spin up fast, high-fidelity mockups and working prototypes to pressure-test ideas before we build * Help build a product culture that harmonizes speed, taste, and customer obsession YOU’LL BE A GREAT FIT IF... * You have serious taste in UI/UX, and you can point to interfaces you've designed that prove it * You're a great writer * You love reading about the history of design and artistic styles * You can spin up fast mockups and demos in Figma, Lovable, or similar feels like second nature * You live in tools like Mobbin and Figr * growth.design [http://growth.design] is something you'd enjoy reading * You love LLMs and are the kind of person to max out on tokens * You resonate with our engineering philosophy [https://substrate-industries.notion.site/product-engineering?source=copy_link] NEXT STEPS If you are interested, please apply via Dover AND email kelvin@joinsubstrate.com [kelvin@joinsubstrate.com] with the following (your app won't be considered without these): * If you could have one person's career arc, who would it be and why? * What's an unpopular truth you believe in? * What's the most insanely great thing you've ever designed? Include a link or video so we can see! * Confirm your availability for an 8+ month internship * Availability for a 30min call

Requirements

  • •UI/UX Design
  • •Full-stack Engineering
  • •Product Design
  • •Copywriting
  • •Prototyping
  • •Figma
  • •Lovable
  • •LLMs
  • •Product Development
  • •Customer Discovery
  • •Technical Writing

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