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 USDWe 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 Launch cross-agent design system and SDK used by at least 2 internal teams.Establish weekly "deploy and measure" cadence with performance metrics and error budgets.Culture Fit:Persistent, driven problem solverWilling to push back on leadership to defend quality/timelinesThrives in high-ambiguity, fast-paced startup environmentsBenefits:Two weeks of paid vacation per year.10 paid days for local holidays.Shape the Future of Healthcare: Build category-defining partnerships that enable doctors to focus on saving lives.Early-Stage Impact: Join early and play a critical role in shaping our partnership roadmap and overall company growth.Remote-First Culture: Work with a talented, mission-driven team in a flexible, remote environment.