Beyond hands-on development, you will serve as a technical leader: guiding component architecture, mentoring engineers, and driving initiatives that raise the bar for UI quality and frontend engineering practices. This role requires strong ownership, deep problem-solving skills, and excellent communication. You will operate in a small, highly collaborative team where clarity, accountability, and impact matter.

Hands-on experience building AI-powered features and using AI tools to improve engineering productivity is required.

Key Responsibilities:

• Lead by example: contribute high-quality React code and set the standard for frontend craftsmanship across the platform
• Shape architecture: design scalable component systems, state management patterns, and frontend infrastructure that support long-term growth
• Mentor engineers: coach and support teammates through code reviews, design discussions, and problem-solving
• Own complex problems: drive investigation, debugging, and resolution of performance, rendering, and scalability challenges
• Drive execution: translate product and design requirements into clear technical designs and well-scoped Jira tickets
• Collaborate cross-functionally: work closely with product, design, and backend partners to deliver impactful, end-to-end solutions
• Establish best practices: improve standards around code quality, accessibility, performance, and reliability
• Champion improvement: introduce new tools, patterns, or approaches , including AI-enabled workflows , where they add real value

Requirements:

• 7+ years of professional software engineering experience, with a strong focus on building and owning modern frontend applications
• Deep expertise in React and modern JavaScript/TypeScript, including component architecture, state management, and frontend application design
• Experience using AI-assisted development tools such as Claude Code or Cursor to accelerate frontend development and improve engineering productivity
• Strong product and design sensibility, with a high bar for UI quality, usability, consistency, and craft
• Proven track record designing frontend architectures that scale across teams, products, and complex user workflows
• Strong knowledge of performance optimization, accessibility, responsive design, and modern frontend best practices
• Deep debugging and problem-solving skills in browser-based applications, with the ability to quickly identify and resolve issues across frontend-backend boundaries
• Proficiency with GitHub-based development workflows, including pull requests, code review practices, branching strategy, and CI/CD automation using GitHub Actions
• Ability to work effectively with backend systems and APIs, contributing where needed while keeping frontend excellence as the primary focus
• Experience as a technical leader who can drive frontend direction, mentor engineers, and raise the quality bar across the team
• Excellent communication skills and the ability to work closely with design, product, and engineering partners

Nice to Have:

• Experience building or integrating AI-powered features
• Familiarity with LangGraph, LangChain, or similar agent-based frameworks
• Experience with data-rich UIs: dashboards, analytics, or complex data visualization
• Background in design systems or shared component libraries
• Experience with Cypress or end-to-end testing frameworks
• Background in DevOps and CI/CD practices

Within Your First 6 Months:

• 1 Month , Ramp up on systems, ship initial contributions, and build context across the platform and team.
• 3 Months , Own features end-to-end, mentor peers, and influence frontend architecture decisions.
• 6 Months , Lead a major frontend initiative, establish guardrails, and raise the bar on performance, scalability, and engineering practices , including thoughtful use of AI where valuable.

Our Values:

• Humble experts
• Hungry for the opportunity
• Intellectually honest
• Operating as one happy team

Awesome Benefits:

• Discretionary time off & sick days
• Paid holidays
• Health insurance
• 401(k) with employer matching
• Quarterly All-Hands meetings
• And much more!

We are proud to be an equal opportunity workplace committed to building a team culture that celebrates learning, diversity and inclusion.

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Anthropic's mission is to create reliable, interpretable, and steerable AI systems. We want AI to be safe and beneficial for our users and for society as a whole. Our team is a quickly growing group of committed researchers, engineers, policy experts, and business leaders working together to build beneficial AI systems.

About the role:

Claude.ai is Anthropic's flagship consumer product, spanning web, mobile, desktop, and browser extensions—and it's growing fast. The UI Platform team owns the foundational layer that makes all of this possible: the shared infrastructure, components, APIs, and tooling that let every other product team at Anthropic ship quickly, reliably, and with confidence.

As a Software Engineer on this team, you'll be hands-on building the platform that other engineers depend on every day. This means designing and shipping shared components and design-system-level abstractions, evolving the backend-for-frontend (BFF) APIs that power our client applications, and improving the build, deploy, and observability systems that keep Claude.ai running smoothly across surfaces. Your work will directly shape how fast teams across Anthropic can innovate—and how stable their experiences are when they do.

This is a great fit if you care deeply about developer experience and want your engineering work to have outsized leverage: instead of shipping one feature, you're building the tools and systems that make dozens of features possible.

Responsibilities:

• Design and build shared UI components, libraries, and abstractions that product teams across Anthropic use to ship consistently and efficiently on web and mobile
• Contribute to the BFF API layer that powers Claude.ai's client applications—thinking carefully about clean contracts, performance, and reliability at the boundary between frontend and backend
• Improve developer velocity across the organisation by reducing friction in our build, deploy, and testing pipelines
• Work on performance and reliability: identify and resolve latency issues, improve observability, and help establish high standards that the rest of the platform team can build on
• Partner closely with product engineering teams to understand their needs, unblock them when possible, and shape platform investments around where the most impact is
• Help maintain and evolve documentation and tooling that make the platform approachable for engineers joining or building on top of it

You may be a good fit if you:

• Have 5+ years of software engineering experience, with significant time spent building shared platforms, developer tools, or infrastructure that other engineers rely on
• Have strong practical skills in modern web technologies (React, TypeScript, Next.js) and experience designing or consuming APIs that serve frontend applications
• Care about developer experience and have a track record of building things that make other engineers more productive
• Have solid instincts around reliability, observability, and performance—and enjoy operationalising those instincts in production systems
• Thrive in fast-paced, collaborative environments and enjoy working closely with cross-functional partners
• Pick up slack, even if it goes outside your job description

Strong candidates may also have experience with:

• Building shared component libraries or design systems for multiple surfaces (web, mobile, desktop)
• BFF architectures and API patterns that balance flexibility with consistency across client platforms
• Performance optimisation and latency reduction in consumer-facing applications
• CI/CD, build systems, and deployment automation
• Observability and monitoring (metrics, logging, tracing)
• Working on AI/ML products or in rapidly evolving product environments

Candidates need not have:

• 100% of the skills needed to perform the job
• Formal certifications or education credentials

Logistics

Education requirements: We require at least a Bachelor's degree in a related field or equivalent experience. Location-based hybrid policy: Currently, we expect all staff to be in one of our offices at least 25% of the time. However, some roles may require more time in our offices. Visa sponsorship: We do sponsor visas! However, we aren't able to successfully sponsor visas for every role and every candidate. But if we make you an offer, we will make every reasonable effort to get you a visa, and we retain an immigration lawyer to help with this. We encourage you to apply even if you do not believe you meet every single qualification. Not all strong candidates will meet every single qualification as listed. Research shows that people who identify as being from underrepresented groups are more prone to experiencing imposter syndrome and doubting the strength of their candidacy, so we urge you not to exclude yourself prematurely and to submit an application if you're interested in this work. Your safety matters to us. To protect yourself from potential scams, remember that Anthropic recruiters only contact you from @anthropic.com email addresses. In some cases, we may partner with vetted recruiting agencies who will identify themselves as working on behalf of Anthropic. Be cautious of emails from other domains.

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