Senior AI Full Stack Engineer for Cross-Platform AI Copilot (Desktop + Extension)

About the Project I'm building Chata, a next-generation AI conversation copilot that helps users communicate more effectively across messaging, email, and collaboration platforms. Unlike a traditional chatbot, Chata understands the conversation, remembers relationship history, retrieves relevant context, and suggests high-quality replies while keeping the user fully in control. The product combines: AI conversation intelligence Long-term memory Browser extensions Desktop applications Mobile apps Voice AI Vision AI Cross-device synchronization Modern SaaS architecture This is a technically ambitious, long-term project, and I'm looking for a Senior Full Stack AI Engineer / Founding Engineer who can help architect and build the platform from the ground up. What You'll Build You'll help design and implement a production-ready AI SaaS platform including: Cross-platform desktop application (Electron or Tauri) Browser Extension (Chrome, Edge, Firefox, Safari via Manifest V3) React web application FastAPI backend AI orchestration layer Real-time conversation engine Long-term memory engine using embeddings and vector search Secure authentication and synchronization Streaming AI responses Subscription and billing system Analytics and monitoring Core Features The platform will include: AI reply suggestions Context-aware conversation understanding Per-contact memory Relationship intelligence Tone selection Goal optimization Writing style adaptation Voice input/output Screenshot and image analysis Conversation summaries Semantic search RAG pipeline Cross-device synchronization Required Technical Skills You should have strong experience with most of the following: Frontend React TypeScript Tailwind CSS shadcn/ui Backend Python FastAPI PostgreSQL REST APIs WebSockets Redis AI OpenAI API Anthropic Claude API Gemini API Prompt Engineering RAG Embeddings Vector Databases AI Memory Systems Streaming Responses Desktop Electron (preferred) Tauri (bonus) Browser Extensions Manifest V3 Chrome Extensions Firefox Extensions Safari WebExtensions Content Scripts DOM Manipulation Mutation Observers Native Messaging Infrastructure Docker GitHub Actions CI/CD Supabase Authentication OAuth Stripe Nice-to-Have Skills React Native Expo Neo4j Pinecone ChromaDB LangGraph LangChain Whisper ElevenLabs Sentry OpenTelemetry Kubernetes What I'm Looking For I'm not looking for someone who simply follows instructions. I'm looking for someone who can: Design scalable architectures Make sound engineering decisions Write clean, maintainable code Build production-quality software Think like a product engineer Communicate proactively Recommend improvements rather than just implement tasks If you enjoy solving difficult engineering challenges and building AI-native products, you'll likely be a great fit. Project Scope This is expected to be a long-term engagement. Potential phases include: Architecture MVP Beta Public launch Scaling Enterprise features Ongoing improvements Please Include in Your Proposal Please answer the following: Tell me about the most technically challenging AI product you've built. Have you built an Electron or Tauri desktop application? Please share examples. Have you developed and published a Chrome or Manifest V3 browser extension? Have you implemented RAG, embeddings, or vector databases? Which technologies did you use? Have you integrated OpenAI, Claude, or Gemini into a production application? If you were architecting Chata, what technology stack would you choose and why? Share your GitHub, portfolio, or live products if available. Important Please do not apply if your experience is primarily limited to: WordPress Shopify Basic CRUD applications Landing pages Template websites I'm looking for an engineer with experience building complex AI-powered SaaS platforms. Bonus If you've built products involving: AI copilots Productivity software Messaging tools Browser extensions Desktop applications Knowledge management systems AI memory or RAG platforms Developer tools please highlight those projects in your proposal.