Stealth AI Startup is hiring: Platform Web Developer Engineer in San Francisco

Get AI-powered advice on this job and more exclusive features. Current AI tools promise revolutionary capabilities but buckle under real-world demands. Noumena is creating the world's first full-stack intelligence system: a comprehensive AI platform that integrates and optimizes every layer from infrastructure to user experience. Unlike competitors who focus primarily on scaling model size, Noumena's approach is rooted in strategic specialization and system-level optimization. Our product suite launching in Summer 2025 includes Noumena Coder: an intelligent coding assistant capable of deep refactors, multi-file PR planning, and long-range reasoning, all powered by our tailored routing across specialized models with 10M+ context lengths and adaptive compute scaling. About the Role We're hiring a Platform Web Developer Engineer to build and maintain our public-facing digital presence and critical platform infrastructure. You'll develop our marketing website, developer documentation, authentication systems, and billing platform, creating seamless experiences that reflect the quality of our underlying technology. Responsibilities Design and develop Noumena's public website with a focus on performance, accessibility, and conversion Create comprehensive, user-friendly developer documentation and API references Build and maintain authentication and identity management systems across our product suite Develop scalable billing infrastructure to handle large transaction volumes and financial integrations Make strategic build vs. buy decisions, evaluating third-party solutions when appropriate Implement analytics and feedback systems to measure user engagement Design platform components that are composable and support various use cases Ensure compliance with security requirements and financial regulations You May Be a Good Fit If You: Have strong experience with modern web development frameworks and techniques Excel at translating technical concepts into clear, accessible documentation Understand developer experience and what makes great API documentation Have experience building user authentication and billing interfaces Take ownership of your work and navigate ambiguity effectively Take a product-focused approach to building robust, user-friendly solutions Have a keen eye for design and user experience Strong Candidates May Also Have Experience With: TypeScript, React, Next.js, and documentation frameworks Building payment interfaces and billing systems Identity and access management implementations Design systems implementation and maintenance SEO optimization and analytics integration Technical writing or creating developer education materials Performance optimization for global audiences How We're Different We're not just a research lab or just a product team—we're building a comprehensive AI platform that integrates and optimizes every layer from infrastructure to user experience. You'll be joining at the earliest stages of a company creating the AI tools we've all been promised but haven't yet experienced: tools that maintain context across complex projects, solve sophisticated problems without breaking, and actually improve with use rather than degrading. Joining Noumena means helping build the magical experience users have been waiting for, starting with how they discover and understand our platform. Seniority level Seniority level Mid-Senior level Employment type Employment type Full-time Job function Industries Software Development and Technology, Information and Internet Referrals increase your chances of interviewing at Stealth AI Startup by 2x Inferred from the description for this job Medical insurance Vision insurance 401(k) Paid paternity leave Paid maternity leave Get notified about new Software Engineer jobs in San Francisco Bay Area . San Francisco, CA $130,000.00-$238,000.00 4 days ago San Francisco, CA $145,000.00-$230,000.00 6 days ago Software Engineer, AI Platform - New Grad Software Engineer 4 - TV & Web Player Platform Software Engineer I (Full Time) United States San Jose, CA $98,600.00-$125,900.00 2 weeks ago Menlo Park, CA $56.25-$173,000.00 2 weeks ago Sunnyvale, CA $56.25-$173,000.00 1 day ago San Francisco, CA $130,000.00-$190,000.00 5 days ago San Francisco, CA $70.67-$208,000.00 1 day ago San Francisco, CA $170,000.00-$270,000.00 2 weeks ago Full Stack Software Engineer (L5), Content Middleware Infrastructure San Francisco, CA $170,000.00-$250,000.00 2 weeks ago (General Hire) Software Engineer Graduate (Advertisement Team) - 2025 Start (BS/MS) San Jose, CA $113,500.00-$250,000.00 1 day ago San Francisco, CA $170,000.00-$270,000.00 2 weeks ago Software Engineer, Frontend (All Levels) San Francisco, CA $150,000.00-$220,000.00 2 days ago Full Stack Software Engineer - Post-training Palo Alto, CA $180,000.00-$440,000.00 2 weeks ago We’re unlocking community knowledge in a new way. Experts add insights directly into each article, started with the help of AI. #J-18808-Ljbffr