Yosevu Kilonzo
Full-stack engineer with 7+ years building and scaling web and mobile platforms across infrastructure, APIs, and frontend. Skilled in TypeScript, React/React Native, Next.js, and AWS, with a focus on reliability, accessibility, data-informed decision-making, and working effectively with both technical and non-technical teams.
SKILLS
EXPERIENCE
Founding engineer and most tenured member of a rapidly growing oncology platform connecting physicians nationwide.
- Architected and maintained full-stack infrastructure (AWS, CI/CD) through fast growth and platform stabilization, supporting new funding and company expansion.
- Built and scaled cross-platform web and mobile applications facilitating over 6,000 oncology consultations and 500+ new inquiries per month across 700+ community oncologists and 100+ experts.
- Migrated API infrastructure, implemented advanced search and chat features, and added federated authentication with high-availability improvements during critical production events.
- Delivered fast-moving releases for oncology conferences and product launches, working closely with product, design, and external partners.
- Sustained delivery through challenging periods, overcoming technical and resource constraints while continuously improving platform reliability.
Improved frontend responsiveness and accessibility for a healthcare portal using React, Mantine, and Tailwind, ensuring consistent UX across mobile and desktop.
Prototyped AI-driven chat integration with TypeScript, Node.js, and OpenAI APIs, enabling secure, context-aware interactions for educational content.
Built and maintained large-scale web platforms and design systems in close collaboration with engineering, design, and product teams.
- Delivered high-traffic websites and design systems for clients including Adobe and Fortune 100 retailers, improving accessibility, scalability, and consistency across brands.
- Rebuilt the Adobe Spectrum CSS design system, migrating to a data-driven token architecture using Style Dictionary, CSS custom properties, and automated visual regression testing to enhance maintainability and performance.
- Developed serverless APIs and microservices (Go, GraphQL, AWS) and optimized ecommerce micro frontends (TypeScript, React) with A/B testing and performance tracking for apps serving millions of users.
- Promoted accessibility, CI/CD best practices, and design-system adoption, mentoring engineers across distributed teams.