Software Engineer, UI Platform

📍 Job Overview

Job Title: Software Engineer, UI Platform

Company: Anthropic

Location: San Francisco, CA | New York City, NY

Job Type: Full-Time

Category: Engineering / Technology / Software

Date Posted: 2026-02-04

Experience Level: 5+ Years

Remote Status: Hybrid

🚀 Role Summary

• This role focuses on building and maintaining the foundational UI Platform for Anthropic's consumer product, Claude.ai, impacting web, mobile, and desktop experiences.

• You will design and implement shared infrastructure, components, APIs, and tooling to empower other product teams to innovate rapidly and reliably.

• Key responsibilities include enhancing developer experience, improving build/deploy/testing pipelines, and ensuring the performance and stability of client applications.

• This position offers significant leverage, enabling you to shape how dozens of features are built and delivered across the organization.

📝 Enhancement Note: While the job title is "Software Engineer, UI Platform," the responsibilities and required skills strongly indicate a senior or lead engineering role focused on internal developer productivity and platform architecture, rather than a traditional frontend feature development position. The emphasis on shared infrastructure, APIs, and developer velocity is characteristic of a platform engineering or senior frontend infrastructure role.

📈 Primary Responsibilities

• Design, build, and maintain shared UI components, libraries, and design-system-level abstractions to ensure consistency and efficiency across Anthropic's web and mobile product surfaces.

• Develop and evolve the Backend-for-Frontend (BFF) API layer, focusing on clean contracts, performance, and reliability at the intersection of client applications and backend services.

• Enhance developer velocity across the organization by optimizing and streamlining build, deployment, and testing pipelines, reducing friction for product teams.

• Proactively identify and resolve performance bottlenecks and latency issues, improve system observability (metrics, logging, tracing), and establish high reliability standards for the platform.

• Collaborate closely with product engineering teams to understand their evolving needs, provide unblocking solutions, and strategically align platform investments with maximum impact.

• Maintain and enhance documentation, tooling, and onboarding processes to ensure the UI Platform is accessible and easy to adopt for new and existing engineers.

📝 Enhancement Note: The responsibilities highlight a strong focus on internal developer productivity and platform stability, aligning with a platform engineering or senior frontend infrastructure role. The emphasis on "developer velocity" and "reducing friction" points to a need for robust CI/CD, efficient build processes, and well-defined API contracts.

🎓 Skills & Qualifications

Education: Bachelor's degree in a related field or equivalent practical experience.

Experience: 5+ years of software engineering experience, with a significant portion dedicated to building shared platforms, developer tools, or infrastructure relied upon by other engineers.

Required Skills:

• Proven experience in designing and building shared UI components, libraries, and design system abstractions for multiple product surfaces (web, mobile).

• Strong practical skills in modern web technologies, including React, TypeScript, and Next.js.

• Demonstrated experience in designing, consuming, or evolving Backend-for-Frontend (BFF) APIs that serve client applications.

• A deep understanding of and passion for developer experience, with a track record of creating tools and systems that enhance engineer productivity.

• Solid instincts and practical experience in reliability engineering, observability (metrics, logging, tracing), and performance optimization of production systems.

• Ability to thrive in fast-paced, collaborative environments and effectively partner with cross-functional teams.

Preferred Skills:

• Experience building and maintaining comprehensive design systems for diverse client platforms.

• Expertise in BFF architectures and API patterns that balance flexibility with consistency across different client platforms.

• Proven ability in performance tuning and latency reduction for consumer-facing applications.

• Hands-on experience with CI/CD pipelines, build systems (e.g., Webpack, Vite), and deployment automation.

• Familiarity with modern observability and monitoring tools and practices.

• Experience working within the AI/ML product space or in rapidly evolving, high-growth product environments.

📝 Enhancement Note: The "5+ years" experience requirement, coupled with the emphasis on platform ownership and developer leverage, suggests this role is suitable for senior engineers or those looking to specialize in platform engineering. The preference for experience with AI/ML products indicates a potential advantage for candidates familiar with the unique challenges of building products in this domain.

📊 Process & Systems Portfolio Requirements

Portfolio Essentials:

• Showcase examples of shared component libraries or design systems you have developed, highlighting their architecture, reusability, and impact on development consistency.

• Present case studies of building or optimizing Backend-for-Frontend (BFF) APIs, detailing API design decisions, performance considerations, and how they served client applications.

• Include projects demonstrating improvements to developer workflows, such as CI/CD pipelines, build system optimizations, or testing frameworks, with measurable outcomes.

Process Documentation:

• Document your approach to designing and implementing reusable UI components and design system principles, focusing on maintainability and scalability.

• Illustrate your process for defining and evolving API contracts, emphasizing clear communication between frontend and backend teams and ensuring robust error handling.

• Detail your methodology for identifying and addressing performance bottlenecks, including profiling techniques, optimization strategies, and post-optimization monitoring.

• Explain your process for establishing and maintaining high standards of reliability and observability within a platform engineering context.

📝 Enhancement Note: Given the platform-centric nature of the role, a portfolio demonstrating architectural thinking, impact on developer productivity, and experience with foundational web technologies is crucial. Candidates should be prepared to discuss the "why" behind their technical decisions and quantify the impact of their work on development speed and system stability.

💵 Compensation & Benefits

Salary Range: $320,000 - $405,000 USD per year.

Benefits:

• Generous vacation policy, allowing ample time for rest and rejuvenation.

• Comprehensive parental leave benefits to support new parents.

• Optional equity donation matching program, enabling employees to contribute to charitable causes.

• Competitive health, dental, and vision insurance plans.

• Opportunities for professional development and learning.

• Flexible working hours to promote work-life balance.

Working Hours: Standard 40-hour work week, with flexibility offered.

📝 Enhancement Note: The provided salary range of $320,000 - $405,000 USD is at the higher end for a Software Engineer role, reflecting the senior experience level, high cost of living in San Francisco/New York, and Anthropic's position in the competitive AI/tech industry. This range likely includes base salary, potential bonuses, and a comprehensive total compensation package.

🎯 Team & Company Context

🏢 Company Culture

Industry: Artificial Intelligence (AI) Research and Development, AI Safety, Public Benefit Corporation.

Company Size: Growing, with a focus on research and engineering talent. The company is actively scaling its product offerings, including its flagship Claude.ai.

Founded: 2021. Anthropic was founded by former members of OpenAI with a mission to build safe and beneficial AI systems.

Team Structure:

• The UI Platform team is a specialized engineering group focused on building the foundational technologies that power Anthropic's consumer-facing AI products.

• This team collaborates closely with various product engineering teams responsible for specific features or user experiences within Claude.ai.

Methodology:

• Anthropic operates with a strong emphasis on scientific rigor, empirical research, and a "big science" approach to AI development.

• The company values impact and focuses on large-scale research efforts aimed at creating reliable, interpretable, and steerable AI systems.

• Collaboration and communication are paramount, with frequent research discussions and a culture of knowledge sharing.

Company Website: https://www.anthropic.com/

📝 Enhancement Note: Anthropic's identity as a Public Benefit Corporation (PBC) suggests a strong commitment to ethical AI development and societal benefit, which likely influences its company culture and decision-making processes. Engineers on the UI Platform team will contribute to a product with significant societal implications.

📈 Career & Growth Analysis

Operations Career Level: Senior Software Engineer / Platform Engineer. This role requires significant experience in building foundational systems and a deep understanding of developer needs. It's a position that offers substantial leverage and influence over the engineering organization's velocity and product quality.

Reporting Structure: Likely reports to an Engineering Manager or Director responsible for platform engineering or core product infrastructure. The role involves significant collaboration with product engineering teams.

Operations Impact: The UI Platform team's work directly impacts the speed, reliability, and consistency with which Anthropic can ship new features and product improvements for Claude.ai. By providing robust infrastructure and tooling, this team enables faster innovation and a better user experience for millions of users.

Growth Opportunities:

• Technical Specialization: Deepen expertise in frontend architecture, performance optimization, API design, and developer tooling within the rapidly evolving AI landscape.

• Leadership Development: Opportunity to mentor junior engineers, lead technical initiatives within the platform team, and influence architectural decisions across product engineering.

• Cross-Functional Exposure: Gain insights into various product areas and collaborate with different engineering teams, understanding diverse technical challenges and user needs.

• Impactful Projects: Contribute to cutting-edge AI products that have a significant societal impact, working on foundational elements that enable groundbreaking AI capabilities.

📝 Enhancement Note: The career path for this role likely leads to Principal Engineer, Staff Engineer, or Engineering Management roles within platform or core infrastructure teams. The opportunity to influence product development at a foundational level is a key growth driver.

🌐 Work Environment

Office Type: Hybrid work model, with an expectation for staff to be in the office at least 25% of the time. Anthropic offers a "lovely office space in which to collaborate with colleagues."

Office Location(s): San Francisco, CA and New York City, NY.

Workspace Context:

• The office environment is designed to foster collaboration, with opportunities for in-person interaction with colleagues on the UI Platform team and across product engineering.

• Access to modern development tools and technology stacks is expected, supporting efficient development and deployment workflows.

• The role encourages close collaboration with product engineering teams to understand their needs and unblock their progress, fostering a supportive and integrated development environment.

Work Schedule: Standard 40-hour work week with flexible working hours. This allows engineers to manage their schedules effectively while ensuring project deadlines and collaborative needs are met.

📝 Enhancement Note: The hybrid model suggests a balance between the flexibility of remote work and the benefits of in-person collaboration, crucial for platform development and team cohesion. Candidates should be comfortable with commuting to one of the specified office locations for a portion of their work week.

📄 Application & Portfolio Review Process

Interview Process:

• Initial Screening: A conversation with a recruiter to assess basic qualifications, experience, and cultural fit.

• Technical Interviews: Multiple rounds focusing on core software engineering principles, system design, frontend architecture, and problem-solving. Expect questions related to React, TypeScript, API design, performance, and reliability.

• System Design/Platform Focus: A dedicated session to evaluate your ability to design scalable, maintainable, and performant platform components, APIs, or developer tools.

• Behavioral Interview: Assessment of your collaboration style, problem-solving approach, and alignment with Anthropic's values and mission.

• Manager/Team Interview: Discussion with the hiring manager and potential teammates to delve deeper into your experience and assess team fit.

Portfolio Review Tips:

• Quantify Impact: For each project, clearly articulate the problem you solved, the technical solution you implemented, and the quantifiable impact (e.g., "reduced build times by X%", "increased developer productivity by Y%", "improved API response time by Z ms").

• Showcase Platform Thinking: Highlight projects where you built reusable components, established architectural patterns, or improved developer workflows. Emphasize the "leverage" your work provided to others.

• Technical Depth: Be prepared to deep-dive into the technical details of your projects, explaining architectural decisions, trade-offs considered, and challenges overcome.

• API Design Examples: If showcasing API work, present clear API contracts, explain the design choices (e.g., REST, GraphQL, BFF pattern), and discuss how you ensured performance and reliability.

• Tailor to the Role: Emphasize projects that align with building shared infrastructure, developer productivity tools, and robust frontend platforms.

Challenge Preparation:

• System Design: Practice designing complex systems, focusing on scalability, reliability, and maintainability. For this role, consider designing a shared component library system, a BFF architecture, or a CI/CD pipeline for a large frontend application.

• Code Challenges: Be ready for coding exercises that test your proficiency in JavaScript/TypeScript, React, and problem-solving. Focus on writing clean, efficient, and well-tested code.

• Performance & Reliability Scenarios: Prepare to discuss how you would diagnose and resolve performance issues or improve the reliability of a complex web application or platform.

📝 Enhancement Note: Anthropic's emphasis on research and scientific rigor suggests that interviewers will probe deeply into your technical reasoning and problem-solving methodologies. Be prepared to articulate your thought process clearly and discuss trade-offs.

🛠 Tools & Technology Stack

Primary Tools:

• Frontend Frameworks: React, Next.js.

• Languages: TypeScript, JavaScript.

• API Technologies: Experience with designing and consuming APIs (e.g., REST, GraphQL). Backend-for-Frontend (BFF) patterns are a key focus.

• Build Tools: Familiarity with modern build systems (e.g., Webpack, Vite) is expected.

• Testing Frameworks: Experience with unit, integration, and end-to-end testing for frontend applications.

Analytics & Reporting:

• Observability Tools: Experience with metrics, logging, and tracing tools (e.g., Prometheus, Grafana, ELK stack, Datadog, Honeycomb) is highly desirable for monitoring platform health and performance.

• Performance Monitoring: Tools for analyzing frontend performance and user experience.

CRM & Automation:

• While not explicitly a CRM role, understanding how platform components integrate with broader product systems is beneficial.

• Familiarity with CI/CD platforms (e.g., GitHub Actions, GitLab CI, Jenkins) for automating build, test, and deployment pipelines.

📝 Enhancement Note: The core stack revolves around modern frontend technologies (React, TypeScript, Next.js) and the principles of platform engineering, API development, and robust operational practices. Proficiency in these areas is essential.

👥 Team Culture & Values

Operations Values:

• Safety & Reliability: A paramount value, reflecting Anthropic's mission. Engineers are expected to prioritize building robust, safe, and dependable systems.

• Impact & Leverage: Focus on work that has significant, outsized impact, particularly in enabling other teams and accelerating product development.

• Collaboration & Communication: Strong emphasis on working together, sharing knowledge, and communicating effectively, as AI development is viewed as a "big science" endeavor.

• Rigorous Inquiry: A commitment to scientific thinking, empirical validation, and a deep understanding of the systems being built.

• Developer Empathy: A core principle for the UI Platform team, understanding and addressing the needs and pain points of fellow engineers.

Collaboration Style:

• Highly collaborative, with frequent cross-functional interactions between the platform team and product engineering teams.

• Open communication channels, encouraging constructive feedback and knowledge sharing through discussions and documentation.

• A proactive approach to problem-solving, where teams work together to unblock challenges and achieve shared goals.

📝 Enhancement Note: Anthropic's mission to build safe and beneficial AI systems likely permeates its culture, fostering a sense of responsibility and ethical consideration in all engineering efforts. The emphasis on collaboration and communication stems from their belief that AI research is a collective, large-scale scientific undertaking.

⚡ Challenges & Growth Opportunities

Challenges:

• Balancing Platform Needs with Product Velocity: Continuously evolving the platform to meet the diverse and rapidly changing needs of multiple product teams without hindering their ability to ship features quickly.

• Maintaining Consistency Across Surfaces: Ensuring a consistent and high-quality user experience across web, mobile, and potentially desktop applications using shared components and APIs.

• Scaling Infrastructure: As Claude.ai grows, ensuring the UI Platform infrastructure, build systems, and APIs can scale efficiently to support increased usage and development activity.

• Staying Ahead of Evolving Technologies: Keeping pace with rapid advancements in web technologies, frontend frameworks, and developer tooling to maintain a state-of-the-art platform.

Learning & Development Opportunities:

• Deep Dive into AI Product Development: Gain unique insights into the challenges and opportunities of building platforms for cutting-edge AI products.

• Advanced Frontend Architecture: Master complex frontend architectures, design systems, and API strategies in a high-stakes environment.

• Platform Engineering Expertise: Develop strong skills in developer productivity tooling, CI/CD, performance optimization, and production system reliability.

• Mentorship and Leadership: Opportunities to guide and mentor other engineers, influencing the technical direction of critical platform components.

📝 Enhancement Note: The challenges are inherent to building foundational platforms in a fast-paced, innovative tech company. Successfully navigating these challenges offers significant opportunities for professional growth and skill development.

💡 Interview Preparation

Strategy Questions:

• "Describe a time you built a shared component library or design system. What were the key architectural decisions, and how did you ensure adoption and consistency?" (Focus on reusability, maintainability, API design for components, and developer onboarding).

• "How would you design a Backend-for-Frontend (BFF) API for a complex consumer application like Claude.ai? What trade-offs would you consider regarding performance, flexibility, and maintainability?" (Prepare to discuss BFF patterns, data aggregation, client-specific needs, and error handling).

Company & Culture Questions:

• "What interests you about Anthropic's mission to build safe and beneficial AI systems?" (Connect your personal values and career goals to Anthropic's mission).

• "How do you approach collaboration with product engineering teams when building platform features?" (Highlight your experience in understanding user needs, gathering feedback, and ensuring alignment).

Portfolio Presentation Strategy:

• Structure for Impact: Organize your portfolio around key themes: Platform Architecture, Developer Productivity, Performance & Reliability.

• Showcase Problem-Solution-Impact: For each project, clearly articulate the problem, your solution, and the measurable impact. Use metrics wherever possible.

• Technical Deep Dives: Be ready to walk through code snippets, architectural diagrams, or system designs, explaining your technical reasoning.

• Focus on Leverage: Emphasize how your work enabled other engineers or teams to be more efficient and successful.

📝 Enhancement Note: Be prepared to discuss your thought process, decision-making rationale, and how you approach trade-offs. Anthropic values scientific rigor and clear communication, so articulate your answers precisely.

📌 Application Steps

To apply for this Software Engineer, UI Platform position:

• Submit your application through the provided Greenhouse link.

• Tailor Your Resume: Highlight experience in building shared platforms, UI components, API development (especially BFF), and improving developer workflows. Quantify achievements with specific metrics.

• Prepare Your Portfolio: Curate examples of projects demonstrating your skills in React, TypeScript, Next.js, API design, performance optimization, and developer tooling. Focus on projects that showcase platform thinking and developer leverage.

• Practice Technical & System Design: Review core concepts in JavaScript/TypeScript, React, API design, and system design. Practice explaining complex technical solutions clearly.

• Research Anthropic: Understand their mission, values, and the Claude.ai product. Be prepared to discuss why you are excited about contributing to AI safety and beneficial AI development.

⚠️ Important Notice: This enhanced job description includes AI-generated insights and operations industry-standard assumptions. All details should be verified directly with the hiring organization before making application decisions.