Sr. Full-Stack Developer

*Native/Bilingual English is required for this role (read/written/spoken) Please upload your CV Resume in English. Monthly salary: $5,000 - $6,500 USD We are seeking a Senior Software Engineer to architect and scale our partner's platform-level agentic AI systems within our Engineering Research team. This role combines Full-Stack engineering excellence with deep expertise in LLM-powered experiences. You'll design, implement, and optimize core components across frontend, backend, and model integrations, while driving engineering direction in close collaboration with our co-founders. Your work will directly shape the reliability, speed, and cohesion of their multi-agent ecosystem. Key Responsibilities: Architect and implement cross-agent systems that power core experiences. Build and scale Full-Stack product components using TypeScript/React and Python services. Integrate LLMs into production workflows with strong contracts, observability, and test coverage. Develop shared UI components and typed SDKs to unify cross-agent experiences. Lead engineering direction, collaborating with founders and cross-functional stakeholders. Hard Requirements: Senior-level Full-Stack experience in React, TypeScript, and Python. Proven ability to design, ship, and scale LLM-powered applications. Expertise in API design, streaming, and CI/CD pipelines. Strong cloud infrastructure background (AWS, GCP, or Azure). Track record of building reliable systems with measurable performance and error budgets. Nice-to-Have: Experience with WebRTC or audio-aware UI design. Hands-on work with agentic AI frameworks. History of creating design tokens, SDKs, or cross-agent platforms. First-Month Focus: Audit current cross-agent flows for UI/UX cohesion. Implement shared components and typed contracts for reliability. Establish instrumentation for frontend performance and model round-trip tracing. Success OKRs (90 Days): Deliver end-to-end tested, production-grade agentic workflows with