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 - Platform / Frontend

Date Posted: April 08, 2026

Experience Level: Mid-Senior Level (5-10 years)

Remote Status: Hybrid

🚀 Role Summary

• Develop and maintain the foundational UI platform infrastructure, shared components, and APIs that empower product teams to ship features rapidly and reliably.

• Enhance developer velocity and productivity by optimizing build, deploy, testing, and observability systems across web and mobile client applications.

• Drive improvements in application performance, reliability, and latency through proactive identification and resolution of issues.

• Collaborate closely with cross-functional product engineering teams to gather requirements, provide support, and align platform investments with strategic impact.

• Contribute to the evolution of the Backend-for-Frontend (BFF) API layer, ensuring clean contracts, optimal performance, and robust reliability.

📝 Enhancement Note: This role is critical for enabling rapid innovation within Anthropic's product development lifecycle. The focus on "developer experience" and "outsized leverage" indicates a strategic platform engineering position that directly impacts the speed and quality of all consumer-facing applications, particularly Claude.ai. The hybrid nature suggests a need for strong communication and asynchronous collaboration skills, in addition to in-office collaboration.

📈 Primary Responsibilities

• Design, build, and maintain reusable UI components, libraries, and design system abstractions for consistent and efficient implementation across web and mobile platforms.

• Architect and evolve the Backend-for-Frontend (BFF) API layer, focusing on performance, reliability, and clear contractual boundaries between client applications and backend services.

• Implement enhancements to CI/CD pipelines, build systems, and testing frameworks to significantly improve developer velocity and reduce deployment friction.

• Proactively identify and address performance bottlenecks, latency issues, and reliability concerns within the Claude.ai consumer product surfaces.

• Enhance system observability through improved metrics, logging, and tracing capabilities, establishing high standards for production system monitoring.

• Partner with product engineering teams to understand their technical needs, provide platform support, and prioritize feature development based on impact and user feedback.

• Develop and maintain comprehensive documentation, tooling, and onboarding materials to facilitate the adoption and effective use of the UI platform by engineers.

📝 Enhancement Note: The responsibilities emphasize a blend of frontend component development, API design within a BFF architecture, and core platform engineering principles (CI/CD, observability, performance). The direct collaboration with product teams highlights the importance of understanding user needs and translating them into platform solutions, a key aspect of successful GTM enablement through technology.

🎓 Skills & Qualifications

Education: Bachelor’s degree or an equivalent combination of education, training, and/or experience in a relevant field.

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

Required Skills:

• 5+ years of professional software engineering experience.

• Proven experience building shared platforms, developer tools, or infrastructure.

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

• Experience designing or consuming APIs that serve frontend applications, particularly within a Backend-for-Frontend (BFF) context.

• Deep understanding and passion for developer experience (DevEx) and a track record of improving engineering productivity.

• Solid instincts and practical experience with system reliability, observability (metrics, logging, tracing), and performance optimization in production environments.

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

Preferred Skills:

• Experience building shared component libraries or comprehensive design systems for multiple client surfaces (web, mobile, desktop).

• Hands-on experience with BFF architectures and API patterns designed for cross-client consistency and flexibility.

• Demonstrated success in performance optimization and latency reduction for consumer-facing applications.

• Proficiency with CI/CD systems, build automation tools, and deployment strategies.

• Experience with advanced observability and monitoring tools and practices.

• Familiarity with AI/ML products or working in rapidly evolving technology environments.

📝 Enhancement Note: The experience requirement is framed as "5+ years" and "Mid-Senior Level," suggesting that candidates with 5-10 years of relevant experience will be strongly considered. The emphasis on "significant time spent building shared platforms" implies a need for candidates who have operated at a strategic, enabling level rather than solely feature-focused development.

📊 Process & Systems Portfolio Requirements

Portfolio Essentials:

• Showcase of contributions to shared component libraries, design systems, or platform infrastructure projects.

• Examples of API design and implementation, particularly demonstrating understanding of BFF patterns or frontend-backend contract design.

• Demonstrations of work that significantly improved developer velocity, build times, deployment processes, or testing efficiency.

• Case studies illustrating problem-solving related to application performance, latency reduction, or reliability enhancements in production.

Process Documentation:

• Evidence of designing and implementing standardized workflows for component development and integration.

• Examples of process improvements that streamlined build, deployment, or testing lifecycles.

• Documentation of API design principles, best practices, and versioning strategies.

• Contributions to establishing or improving observability and monitoring processes for platform services.

📝 Enhancement Note: For a UI Platform Engineer, a portfolio should highlight not just individual feature contributions but the impact of their work on the broader engineering organization. Demonstrating how their efforts enabled faster, more reliable development for others is crucial. This includes tangible evidence of process optimization and system design that scales.

💵 Compensation & Benefits

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

Benefits:

• Competitive compensation package.

• Optional equity donation matching.

• Generous vacation time.

• Comprehensive parental leave.

• Flexible working hours.

• Lovely office space for collaboration.

Working Hours: 40 hours per week is standard, with flexibility offered.

📝 Enhancement Note: The salary range is at the high end for Software Engineer roles in San Francisco and New York, reflecting the seniority, specialized skills (UI Platform, API, DevEx), and the company's industry (AI/ML) and mission-driven nature. The "flexible working hours" benefit is particularly relevant for operations and platform roles that often require deep focus and can benefit from non-standard work schedules, while also acknowledging the need for collaborative time in a hybrid model.

🎯 Team & Company Context

🏢 Company Culture

Industry: Artificial Intelligence (AI) Research and Development, focused on creating reliable, interpretable, and steerable AI systems.

Company Size: Growing team, indicating a dynamic and evolving environment where individual contributions can have significant impact. As a Public Benefit Corporation, there's an emphasis on societal benefit alongside technological advancement.

Founded: Anthropic was founded with a mission to build safe and beneficial AI. Their research builds on previous work by team members in areas like GPT-3, interpretability, and AI safety.

Team Structure:

• The UI Platform team is a specialized engineering group responsible for the foundational layers of Anthropic's consumer products.

• Likely operates with a flat or matrixed reporting structure typical of fast-growing tech companies, emphasizing collaboration over strict hierarchy.

Methodology:

• Focus on "big science" research and large-scale efforts, suggesting a structured yet adaptable approach to development.

• Emphasis on empirical science, data-driven decision-making, and iterative improvement.

• Collaborative research discussions and a high value placed on communication skills are core to their methodology.

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

📝 Enhancement Note: Anthropic's identity as a Public Benefit Corporation and its mission to build safe AI are central to its culture. For an operations or platform role, this translates to a need for engineers who are not only technically proficient but also align with ethical considerations and a mission-driven purpose. The "big science" approach implies a focus on robust, scalable, and well-documented systems.

📈 Career & Growth Analysis

Operations Career Level: This role is positioned as a mid-to-senior level Software Engineer with a specialization in UI Platform Engineering. It carries significant responsibility for foundational systems that impact the entire engineering organization's output.

Reporting Structure: The UI Platform team likely reports into a Head of Engineering or Director of Engineering, with engineers collaborating closely with product engineering leads and potentially product managers.

Operations Impact: The UI Platform team's work has a direct and outsized impact on Anthropic's ability to deliver and iterate on its flagship consumer product, Claude.ai. By improving developer velocity and system reliability, this role directly contributes to the speed of innovation and the quality of user experience, which are critical for market competitiveness and user adoption.

Growth Opportunities:

• Technical Specialization: Deepen expertise in frontend architecture, component design systems, API development (BFF), and platform engineering best practices.

• Leadership in Platform Development: Opportunity to lead architectural decisions, mentor junior engineers, and shape the technical roadmap for the UI platform.

• Cross-Functional Impact: Gain exposure to various product teams and their unique challenges, fostering a broader understanding of Anthropic's product ecosystem and business objectives.

• Contribution to AI Advancement: Work on cutting-edge AI products, contributing to the development of safe and beneficial AI systems.

📝 Enhancement Note: The role offers substantial growth potential, moving beyond individual contribution to influencing platform strategy and potentially team leadership. The emphasis on "outsized leverage" suggests that successful engineers in this role are recognized for their broad impact and strategic thinking.

🌐 Work Environment

Office Type: Anthropic operates a hybrid work model, requiring staff to be in one of their offices at least 25% of the time. This suggests a focus on in-person collaboration for key discussions, team building, and strategic alignment, while allowing for focused work remotely.

Office Location(s): San Francisco, CA and New York City, NY. These are major tech hubs offering access to talent and a vibrant ecosystem.

Workspace Context:

• Collaborative office spaces designed to foster interaction and idea exchange among engineers and cross-functional teams.

• Access to modern development tools and technologies necessary for building and maintaining a sophisticated UI platform.

• Opportunities for informal discussions, whiteboarding sessions, and pair programming with colleagues, contributing to a dynamic and innovative work environment.

Work Schedule: Standard 40-hour work week with flexible hours, accommodating deep work and personal needs while ensuring availability for team collaboration and critical operational tasks.

📝 Enhancement Note: The hybrid policy is a key aspect of the work environment. For a platform role, this means balancing remote focus time with impactful in-office collaboration. The mention of a "lovely office space" suggests a commitment to providing a positive and functional environment for its employees.

📄 Application & Portfolio Review Process

Interview Process:

• Initial Screening: Review of resume and portfolio, focusing on relevant experience in platform engineering, UI development, API design, and developer productivity improvements.

• Technical Interviews: Series of interviews assessing core engineering skills, system design capabilities, knowledge of modern web technologies (React, TypeScript, Next.js), and problem-solving approaches. Expect questions on API design, performance optimization, and building scalable systems.

• Platform Design/System Design Round: A dedicated session to evaluate the candidate's ability to design and architect complex platform solutions, likely involving a whiteboarding or collaborative design exercise.

• Cross-Functional/Behavioral Interview: Discussion focused on collaboration, communication skills, experience working with product teams, and alignment with Anthropic's mission and values.

• Hiring Manager/Team Lead Interview: Final discussion to assess overall fit, career aspirations, and strategic thinking.

Portfolio Review Tips:

• Quantify Impact: For each project, clearly articulate the problem addressed, your role, the solutions implemented, and the quantifiable results (e.g., % reduction in build time, % increase in feature shipping velocity, reduction in latency).

• Showcase Platform Thinking: Highlight projects where you built reusable components, established design systems, or created infrastructure that benefited multiple teams. Emphasize how your work enabled others.

• API Design Clarity: Present examples of API contracts, especially BFF patterns, explaining the design choices and their benefits for frontend consumption and backend integration.

• Developer Experience Focus: Include examples of tools, scripts, or processes you developed or improved that directly enhanced developer productivity or reduced friction.

• Technical Depth and Breadth: Demonstrate proficiency in core technologies (React, TS, Next.js) while also showing understanding of related areas like performance, observability, and CI/CD.

Challenge Preparation:

• Be prepared for system design questions that involve building scalable and reliable UI platforms or BFF architectures.

• Practice articulating complex technical concepts clearly and concisely, especially when explaining trade-offs and decision-making processes.

• Review Anthropic's mission and values to articulate how your work aligns with building safe and beneficial AI.

📝 Enhancement Note: The interview process will heavily scrutinize candidates' ability to think at a platform level, focusing on architectural decisions, scalability, and the impact of their work on other engineers. A well-curated portfolio that demonstrates these aspects is critical.

🛠 Tools & Technology Stack

Primary Tools:

• Frontend Frameworks: React, Next.js

• Languages: TypeScript

• API Technologies: GraphQL, REST (for BFF interactions)

• Component Libraries: Custom-built shared component libraries, potentially leveraging Storybook or similar for development and documentation.

• Design Systems: Experience with or contribution to design system methodologies and implementation.

Analytics & Reporting:

• Observability Tools: Metrics (e.g., Prometheus, Grafana), Logging (e.g., ELK stack, Splunk), Tracing (e.g., Jaeger, OpenTelemetry).

• Performance Monitoring: Tools for web performance analysis and latency tracking.

CRM & Automation:

• CI/CD: Jenkins, GitHub Actions, GitLab CI, or similar for build, test, and deployment automation.

• Build Systems: Webpack, Vite, or similar module bundlers.

• Version Control: Git.

📝 Enhancement Note: The technology stack is standard for modern, high-performance web applications, with a strong emphasis on TypeScript and React within a Next.js framework. The inclusion of BFF architectures and robust observability tools points to a mature engineering organization focused on scalability and reliability.

👥 Team Culture & Values

Operations Values:

• Reliability: A core tenet, ensuring the platform and applications are stable and dependable for users and internal teams.

• Developer Productivity: A driving force, aiming to make it as easy and fast as possible for engineers to build and deploy features.

• Collaboration: Essential for a platform team, requiring close partnership with product engineers and other stakeholders.

• Impact-Driven: Focus on delivering solutions that have significant leverage and contribute to Anthropic's mission.

• Safety & Ethics: Given Anthropic's mission, an implicit value of building systems responsibly and considering their societal impact.

Collaboration Style:

• Highly collaborative, with a strong emphasis on cross-functional teamwork between the UI Platform team and various product engineering teams.

• Open communication channels, regular syncs, and a willingness to provide and receive feedback are expected.

• Encourages knowledge sharing through documentation, code reviews, and internal presentations.

📝 Enhancement Note: Anthropic's culture emphasizes mission alignment, collaboration, and a scientific approach to problem-solving. For a platform engineer, this means understanding how their technical contributions support the broader company goals and working effectively within a highly intelligent and driven team.

⚡ Challenges & Growth Opportunities

Challenges:

• Scaling a Platform: Ensuring the UI platform can scale effectively to support rapid growth in product complexity and user base.

• Balancing Innovation and Stability: Maintaining high standards for reliability and performance while enabling fast iteration and feature development.

• Cross-Team Alignment: Effectively managing diverse needs and priorities from multiple product engineering teams dependent on the platform.

• Evolving AI Landscape: Adapting the platform to potential future integration needs with advanced AI/ML features and interfaces.

Learning & Development Opportunities:

• Advanced Platform Architecture: Deepen knowledge in designing and scaling complex software platforms.

• Cutting-Edge Frontend Technologies: Stay abreast of and implement the latest advancements in React, TypeScript, and web development.

• AI Product Integration: Gain unique experience working at the intersection of AI/ML and consumer product development.

• Leadership and Mentorship: Opportunities to lead technical initiatives and mentor other engineers on the team.

📝 Enhancement Note: The challenges inherent in building a foundational platform for a rapidly growing AI company are significant but also present prime opportunities for professional growth and impact.

💡 Interview Preparation

Strategy Questions:

• "Describe a time you built a shared component or library that significantly improved developer productivity. What was the impact?"

• "How would you approach designing a Backend-for-Frontend (BFF) API for a consumer-facing product like Claude.ai, considering performance, reliability, and multiple client surfaces?"

Company & Culture Questions:

• "How does Anthropic's mission to build safe and beneficial AI align with your own career goals or values?"

• "Describe your experience working in a hybrid environment. How do you ensure effective collaboration and communication with remote and in-office colleagues?"

Portfolio Presentation Strategy:

• Structure: Organize your portfolio around key impact areas: Developer Productivity Improvements, Architectural Contributions, Performance/Reliability Enhancements.

• Storytelling: For each project, clearly articulate the "Why," "What," and "So What." Explain the problem, your solution, and the measurable outcome.

• Quantification is Key: Use metrics whenever possible to demonstrate the scale of your impact.

• Focus on Platform Thinking: Emphasize how your work enabled others and contributed to the overall efficiency and success of the engineering organization.

📝 Enhancement Note: Prepare to discuss technical challenges at a system and architectural level, with a strong emphasis on how your work enables other engineers and contributes to business objectives. Quantifiable results are paramount.

📌 Application Steps

To apply for this Software Engineer, UI Platform position:

• Submit your application through the official Greenhouse portal linked from the Anthropic careers page.

• Portfolio Customization: Tailor your resume and portfolio to highlight projects demonstrating experience with React, TypeScript, Next.js, API design (especially BFF), shared component libraries, and developer productivity improvements.

• Resume Optimization: Ensure your resume clearly quantifies achievements and uses keywords relevant to platform engineering, frontend development, and developer experience.

• Interview Preparation: Practice articulating your technical thought process, system design approaches, and the impact of your past work, especially in relation to enabling other engineers. Be ready to discuss Anthropic's mission and how your skills align.

• Company Research: Familiarize yourself with Anthropic's mission, products (Claude.ai), and recent research. Understand their commitment to safe AI and their Public Benefit Corporation status.

⚠️ 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.