Yosevu Kilonzo

• Built the frontend for a Claude-powered AI platform serving clinical oncology, with structured outputs and real-time multi-expert review interfaces.
• Shipped features across multi-stage AI pipelines: durable workflow orchestration, MCP tool use, and structured clinical data extraction in a regulated healthcare domain.
• Designed and implemented AI infrastructure: Bedrock-backed inference, prompt management, grounded retrieval from medical literature (RAG), and guardrails for clinical accuracy.

Founding engineer; built web and React Native mobile platform connecting health care providers with oncology subspecialists for real-time clinical input.

• Architected AWS platform (Bedrock, ECS, Lambda, Aurora, Cognito, AppConfig) from the ground up with IaC.
• Built developer infrastructure: PR preview environments with dynamic DNS and automatic cleanup.
• Built cross-platform product UI in React Native and React (iOS, Android, web) with TypeScript, Tailwind, and a shared component library across 100+ components.
• Designed federated auth (Cognito, Google OAuth) and built core product features: inquiry submission, expert directory with search, and community platform.
• Built developer CLI with MFA authentication, secure database tunneling, and role-based access.

• Built AI-driven conversational interface for a cross-cultural learning platform using TypeScript, Node.js, and OpenAI APIs.
• Applied context engineering: prompt patterns that ground chat responses in domain-specific learning content.

Built and maintained large-scale web platforms and design systems for Adobe, Gap, and P&G.

• Rebuilt Adobe Spectrum CSS design system, migrating to a token-driven architecture with Style Dictionary and CSS custom properties; system used by thousands of Adobe product developers.
• Built serverless APIs and optimized ecommerce micro frontends for high-traffic retail platforms.
• Drove accessibility standards, CI/CD practices, and design-system adoption across distributed client engagements.