Lucy Labs
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Frontend Engineer

This role helps build Lucy, the proactive AI coach from Lucy Labs that lives on your desktop as a cloud-backed app, while the product is in development with design partners.

Owns the interface and interaction layer of the Lucy coach.

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Planned work

About the role

At Lucy Labs, this role owns the purpose described below.

The Frontend Engineer at Lucy Labs builds intuitive, fast, and elegant product experiences that enable humans to work with AI in powerful new ways. This role owns the user interface and interaction layer of the Lucy Labs Coach, making complex AI workflows feel simple and usable. Frontend Engineers are builders who care about both craft and impact—shipping UI that users love and rely on every day.

The mission

At Lucy Labs, this role's mission is defined by the outcome and work below.

Create world-class user experiences that:

  • Drive daily engagement and workflow adoption
  • Enable seamless interaction with AI systems
  • Make complex work feel simple and intuitive
  • Balance speed of delivery with long-term design quality
  • Support our mission of changing how people think and work with AI

What you'd own

At Lucy Labs, this role turns its mission into concrete responsibilities in each area.

1. Product Engineering

For 1. Product Engineering, Lucy Labs expects this role to own the responsibilities below.

  • Build and ship frontend features for the Lucy Labs Coach (desktop and web)
  • Implement clean, accessible UI with strong attention to interaction design
  • Collaborate with Product and Design on user-first experiences
  • Own frontend feature delivery from concept to production

2. UI Architecture & System Design

For 2. UI Architecture & System Design, Lucy Labs expects this role to own the responsibilities below.

  • Build scalable and maintainable UI architecture
  • Contribute to component systems and design libraries
  • Drive UI performance, responsiveness, and visual quality
  • Maintain a strong separation of concerns and clean abstractions

3. AI Interaction Experience

For 3. AI Interaction Experience, Lucy Labs expects this role to own the responsibilities below.

  • Build natural interaction patterns for human + AI collaboration
  • Design UI flows around prompts, suggestions, and AI coaching
  • Help visualize productivity gains and workflow transformation
  • Create intelligent, context-aware UI experiences

4. Engineering Craft & Quality

For 4. Engineering Craft & Quality, Lucy Labs expects this role to own the responsibilities below.

  • Write clean, testable, production-quality code
  • Conduct code reviews and uphold engineering standards
  • Improve frontend tooling, build times, and release flows
  • Work closely with backend/platform engineers to shape APIs

What success looks like

Lucy Labs defines these milestones as role outcomes, not metrics for measuring the person.

60 days
Shipped first product features with quality
90 days
Owns core UI areas and patterns
6 months
Drives user experience improvements and adoption
12 months
Leads frontend architecture evolution

Experience and fit

Lucy Labs looks for the essential experience listed here and treats the rest as helpful, not an automatic barrier.

Must have

  • 3+ years frontend engineering experience
  • Strong proficiency in React, TypeScript, or similar frameworks
  • Solid understanding of UI/UX fundamentals
  • Experience integrating with backend APIs
  • Strong product and ownership mindset

Nice to have

  • Experience with desktop frameworks (Electron, Tauri, or similar)
  • AI product or interaction design experience
  • Component library or design system contributions
  • Startup or 0→1 experience

How you work

Lucy Labs looks for these working traits alongside technical experience.

Role DNA

Lucy Labs evaluates these traits as part of the fit for this role.

  • Builder with strong product intuition
  • Obsessed with simplicity and clarity
  • Quality and detail oriented
  • Collaborative and growth minded
  • Ships with urgency and ownership

Leadership principles for the role

Lucy Labs expects this role to apply the following leadership principles.

  • Simplicity wins
  • Experience is the product
  • Small details create trust
  • Work backward from user value
  • Ship, learn, and improve
Next step

Apply for this role

The Lucy Labs application form opens with this role already selected. You can review the message before sending it.

Apply for this role

Frequently asked questions

Is this role open at Lucy Labs?

Yes. Lucy Labs confirmed this role is open on 25 August 2026.

Where does Lucy Labs base this role?

Lucy Labs bases this role in Madrid, Spain. The exact working arrangement is confirmed during the application conversation.

What does this role own at Lucy Labs?

At Lucy Labs, this role has one central responsibility: Owns the interface and interaction layer of the Lucy coach. The full description sets out the mission, responsibilities, and relevant experience.

How do I apply to Lucy Labs?

At Lucy Labs, use the application form. The role is selected automatically, and you can review it before sending.

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