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Senior Software Engineer, Full-Stack & AI Systems at Sully.ai. Remote Location: US - Remote. About Us. 👏 Team from OpenAI, DeepMind, NASA, GoogleX, Tesla, and 2 physicians: 6 exits, 2 IPOs.. 🔥 Our model outperforms Claude, Gemini, and GPT-4.5 on clinical benchmarks.. 📈 400+ healthcare orgs signed in 16 months.. ⚡️ $25M raised from YC, Amity Ventures, Sequoia scouts, and more.. 🌎 $1T+ market opportunity. We’re going after all of it.. About the Role. We are seeking a Senior Software Engineer to architect and scale . Sully.ai. ’s platform-level agentic AI systems. 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 . Sully.ai. ’s multi-agent ecosystem.. Key Responsibilities. Architect and implement cross-agent systems that power core . Sully.ai. 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 <5% error rates.. 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 solver. Willing to push back on leadership to defend quality/timelines. Thrives in high-ambiguity, fast-paced startup environments. Why Join . Sully.ai. ?. 🔥 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.. 💰 Competitive Compensation: Enjoy a competitive salary, equity, and the opportunity to make a real difference.. 🏆 Solve Scalability Challenges: Tackle complex challenges in a rapidly growing company, driving impactful change in healthcare.. Sully.ai is an equal opportunity employer. In addition to EEO being the law, it is a policy that is fully consistent with our principles. All qualified applicants will receive consideration for employment without regard to status as a protected veteran or a qualified individual with a disability, or other protected status such as race, religion, color, national origin, sex, sexual orientation, gender identity, genetic information, pregnancy or age. Sully.ai prohibits any form of workplace harassment..