Frontend Developer Intern Jobs in California (NOW HIRING)

About Moon
An ambitious and independent stealth SaaS company incubated by Home Organizers, a market leader with decades of proven success in designing and delivering exceptional, innovative home organization solutions through its subsidiaries Closet World, Closets by Design, Brio Water Technology, and others. Backed by their deep industry experience and a commitment to be Home Organizer's critical SaaS provider for its 6000+ employees, our team is building innovative solutions to solve universal problems that most businesses face - yet are not addressed by a single, unified tool.
Our mission is to transform the entrepreneurial experience and deliver operational excellence for businesses across the world through a unified platform supercharged with proprietary AI agents. We want to unleash the creativity of billions and inspire the world to dream big and build fast. We're a rapidly growing team of forward-thinking and, most importantly, committed builders. We are driven by the opportunity to push boundaries, reimagine the foundations of human work, and shape tools that power the next generation of "business operations." The way the world views and does business is changing, and we are committed to leading this change responsibly.
Role Overview
The home services field runs on iPads. Technicians use our Capacitor/Ionic app on-site - often with intermittent connectivity, gloved hands, and zero patience for broken UI. As the Frontend Engineering Intern, you'll build the interfaces those users depend on. This is not a project-based internship with a demo at the end. You'll own a real feature module, submit code for real review, and ship to production users before your internship ends.
You'll work in two environments simultaneously: a React web application for desktop users and a
Capacitor/Ionic app wrapped around the same codebase for iPad. Understanding where web code
behaves differently inside a native wrapper isn't optional - it's part of the job from day one.
About the role
You'll join the engineering team and pair closely with a dedicated mentor throughout the
program. The mentor relationship is structured - not ad-hoc - with weekly 1:1s, live code
review sessions, and pair programming on the areas where you're ramping.
The engineering bar for your PRs is the same bar applied to the full-time team. Mentorship is
how we help you meet it - not a reason to lower it.
We expect 3 days on-site in Glendale, with flexibility around your academic schedule. Fully
remote is not offered.
AI-assisted development is the default here. You'll be working alongside engineers who use
Cursor, Copilot, and Claude as primary tools, and you're expected to come in already working
that way.
The tech stack is iPad-first. Capacitor and Ionic are highly desired context - they're the runtime
your code ships into.
What you'll do
UI Development & Feature Ownership
Build and extend React + Capacitor/Ionic UI components following the team's established
patterns and design system.
Own at least one defined feature module end-to-end: from design spec through code review and
into production.
Implement UI for the iPad Capacitor app - understanding how web-layer code behaves
differently inside a native wrapper is part of the scope.
Handle real frontend constraints: offline state management, loading and error boundaries, form
validation, and responsive layouts under field conditions.
Wire up new API endpoints - read .NET API contracts and build the client-side layer on top of
them.
Quality & Engineering Standards
Write component-level unit and integration tests alongside every feature - untested UI does
not ship.
Give and receive feedback in code review from day one; you are a participant, not an observer.
Use AI tools (Cursor, Copilot, Claude) to accelerate component generation, refactoring, and code
review preparation - AI-assisted development is your default mode, not an occasional tool.
Document component behavior and UI patterns as part of the standard definition of done.
Qualifications
Required
Working knowledge of React - you've built something real with it, even if it's a side project or
class assignment.
JavaScript or TypeScript; TypeScript strongly preferred (the codebase is fully typed).
Solid understanding of how the browser works: the DOM, event handling, the network layer, and
why things fail in ways that feel random but aren't.
Active, habitual AI tool usage - not occasional ChatGPT pastes, but a real workflow with specific
tools you can describe and defend. This is evaluated explicitly.
Clear written communication: in PRs, in async standups, and when you're stuck - you write
before you ask.
Nice to Have
Experience with Ionic, Capacitor, React Native, or any mobile-web hybrid framework.
Component testing with React Testing Library, Vitest, Jest, or similar.
Experience consuming REST APIs from a frontend.
Exposure to accessibility standards (WCAG) or responsive design for touch-first interfaces.
What You'll Get
Competitive hourly compensation, tiered by experience (undergraduate and graduate rates;
details shared during the process).
A dedicated mentor on the team - structured weekly 1:1s, live pair programming, and code
review guidance throughout the program.
Work that ships - features you build will go to production users during the internship.
Real code review under the same standards applied to the full-time team - not the kind that
approves everything.
AI tooling stipend (Cursor Pro, Claude Pro, or equivalent) - the AI-native expectation is real; we
remove the financial barrier to getting there.
Priority consideration for full-time roles upon graduation.
Location & Hybrid Policy
This role is based in Glendale, CA. We expect 3 days on-site per week, with flexibility around
academic schedules communicated in advance. Fully remote arrangements are not offered.
Candidates who cannot commit to regular on-site presence in Glendale are not a fit for this program.
How to Apply
Send your resume and a link to something you've built - GitHub, a deployed project, a class project,
anything. No shareable work? Tell us about a UI problem you solved and how you approached it.
Applications are reviewed on a rolling basis.
Moon is committed to building a diverse and inclusive team. We encourage applications from
candidates of all backgrounds, institutions, and experience levels. We evaluate based on
demonstrated ability, not credentials.
The pay range for this role is:
25 - 35 USD per hour (Moon HQ)