Frontend Engineer, UI Platform
Stripe is hiring a Frontend Engineer, UI Platform in Barcelona, Spain. Level rates it ; you can apply on Stripe.
Level's read on this job
- Level rates this software engineer role Works on AI ●●●○: the daily work is on AI products, without building the model.
- The posting mentions frontend development, ui design systems and react among its tools and skills.
- Level classes it as a mid-level role.
- Stripe has 765 other open roles on Level.
- Posted within the past two weeks.
AI in this role
Build and evolve frontend UI platforms, design systems, and agentic tooling to support both human engineers and AI coding agents.
Who we are
About Stripe
Stripe is a financial infrastructure platform for businesses. Millions of companies—from the world’s largest enterprises to the most ambitious startups—use Stripe to accept payments, grow their revenue, and accelerate new business opportunities. Our mission is to increase the GDP of the internet, and we have a staggering amount of work ahead. That means you have an unprecedented opportunity to put the global economy within everyone’s reach while doing the most important work of your career.
About the team
The UI Platform team, known as Sail, builds the foundations that support Stripe’s Dashboard and many of Stripe’s other user interfaces. The Sail UI team owns Stripe’s design system, helping Stripe engineers create consistent, accessible, performant, and high-quality experiences at scale.
We build and maintain reusable components, design tokens, theming capabilities, documentation, and developer tooling used by engineers and designers across Stripe. We are currently focused on two major projects. First, we are building Sail for Agents: the generation infrastructure, documentation systems, agent integrations, and automated quality checks that help AI coding agents build high-quality Stripe interfaces safely and consistently at scale. Second, we are evolving the visual language of the Dashboard, one of Stripe’s largest UI surfaces, while modernizing its underlying codebase.
What you’ll do
As a Frontend Engineer on the Sail UI team, you’ll help build and evolve Stripe’s design system and the tools that enable engineers and AI coding agents to create high-quality user interfaces. You’ll independently drive frontend projects from problem definition through rollout, working closely with designers, product engineers, and other Sail engineers. Your work will range from reusable components, themes, and documentation to agentic tooling, automated quality checks, and modernizing the foundations of Stripe’s Dashboard.
Responsibilities
- Take end-to-end ownership of software projects, independently scoping problems and carrying solutions through design, implementation, testing, and rollout
- Build and maintain accessible, performant, and well-tested components, themes, and frontend APIs used across Stripe
- Build tooling, documentation, and automated quality checks that help engineers and AI coding agents use Sail effectively and meet Stripe’s UI quality bar
- Partner with product designers and engineers to understand their needs and turn recurring UI patterns into reusable design-system capabilities
- Help evolve the visual language of Stripe’s Dashboard while modernizing its underlying codebase and migrating legacy UI patterns
- Improve the accessibility, internationalization, observability, performance, reliability, and developer experience of the design system
- Contribute thoughtful code reviews, technical discussions, and documentation that improve the quality of the team’s work
Who you are
We’re looking for someone who meets the minimum requirements to be considered for the role. If you meet these requirements, you are encouraged to apply. The preferred qualifications are a bonus, not a requirement.
Minimum requirements
- Fluency in using AI-assisted and agentic development tools as part of day-to-day software engineering, including critically reviewing, validating, and improving generated code
- 2+ years of professional frontend engineering experience, or equivalent practical experience, building, shipping, and debugging web applications
- Strong knowledge of modern frontend technologies and frameworks, including browser fundamentals, responsive design, and accessibility
- Ability to independently scope and deliver open-ended frontend projects, making practical technical and product tradeoffs with limited oversight
- Strong problem-solving and debugging skills, with attention to testing, maintainability, and the quality of the resulting user experience
- Strong written and verbal communication skills and the ability to collaborate effectively with designers, product engineers, and other partners
Preferred qualifications
- Experience working on a design system, frontend platform, or shared component library
- Experience with developer tooling such as build tools, package managers, codemods, lint rules, or large monorepos
- Experience building tools, integrations, or automated evaluation and quality systems for AI coding agents
- Experience using documentation, developer feedback, or adoption data to improve a developer-facing product
How we rate this
Frontend Engineer, UI Platform at Stripe rates 60 out of 100 for how much of the daily work is AI. That makes it Works on AI (AI Level 3 of 4). The level is about AI in the job, not seniority.
Works on AI. The daily work is on AI products, without building the model.
- ●●●● Builds AI80 to 100
- ●●●○ Works on AI60 to 79
- ●●○○ Uses AI40 to 59
- ●○○○ Little AI0 to 39
Levels come from how often the tools, models and workflows of the role are named in the posting itself. Read the description and count the AI tools, models and workflows it names.
Prepare for this job
Built from this posting and from similar jobs on Level.
Skills and AI tools this role asks for
Pay
- Typical software engineer job
- $167k
This posting doesn't list pay. Use the typical software engineer figure when pay comes up. See software engineer jobs
Questions you could be asked
- Tell me about a project where frontend development was part of your work. What did you do?
- Tell me about a project where ui design systems was part of your work. What did you do?
- Tell me about a project where react was part of your work. What did you do?
- Tell me about a project where developer tooling was part of your work. What did you do?
- Describe a typical day in a role like this one: which parts run through AI directly?
Adapt your resume
- List these exact terms on your resume: Frontend Development, UI Design Systems, React, and Developer Tooling. An applicant tracking system matches the wording, not the idea.
- Attach one line of real, concrete experience to at least one of them. A tool named with nothing behind it rarely survives a human read.
- Show where AI is part of your daily process, not a one-off project. This role expects it to be a running habit.
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