Kagendo Tech Builds

Hello,
I’m Winfred kagendo,

I build Performant,accessible UIs that are scalable

Current Position: Frontend Engineer at Leja

Open To : Collaborations, Freelance Gigs, Job, Mentorship

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Crafting Interfaces That Drive Impact

Senior Frontend Engineer with 5+ years building impactful web applications across fintech, healthcare, and SaaS. Expert in React, Next.js, and modern UI systems, delivering pixel-perfect, SEO-friendly interfaces that elevate user experience and boost performance.

  • Developed a Safaricom Mini App with Ant Design Mini + JSAPI, driving engagement and retention.

  • Translated Figma designs into pixel-perfect UIs with React, Next.js, and MUI, ensuring responsiveness across devices.

  • Hardened app security with HTTPS, input validation, and XSS/CSRF protection, reducing vulnerabilities by 20%.

  • Boosted SEO with optimized metadata, Open Graph tags, and structured data, leading to a 15% increase in organic traffic.

  • Built scalable, testable components that reduced development time and improved design consistency.

  • Integrated RESTful APIs seamlessly, accelerating feature delivery and backend collaboration.

  • Led peer code reviews to uphold best practices and high code quality.

  • Contributed actively to Agile development processes, improving sprint velocity and alignment with business goals.

  • Implemented a reusable component strategy that cut development time by 30%, boosting team efficiency.

  • Optimized app performance using advanced React tooling, achieving faster load times and seamless UX.

  • Enhanced frontend authorization with CASL for fine-grained UI control, improving security.

  • Led peer code reviews, ensuring adherence to team-wide standards and technical growth.

  • Collaborated with cross-functional teams to align product goals with execution, driving project success.

  • Developed mobile-first UIs with Vue 3, Pinia, and GraphQL, broadening user reach across devices.

  • Delivered dynamic dashboards, empowering users with real-time insights and customizable views.

  • Optimized performance through efficient RESTful and GraphQL integrations, increasing responsiveness by 20%.

  • Implemented fine-grained access control with CASL, elevating route and component-level security.

  • Mentored 10+ engineering interns, accelerating onboarding and increasing team output by 30%.

  • Built scalable React.js applications in monorepos with Turborepo, enabling efficient code sharing across apps.

  • Reduced load times significantly using code splitting, lazy loading, and webpack optimizations.

  • Achieved WCAG 2.1 compliance through ARIA roles and semantic HTML, ensuring inclusive user experiences.

  • Delivered cross-platform farm supply apps using React Native and Expo, expanding reach in rural areas.

  • Increased reliability with robust test coverage using Jest and React Testing Library.

  • Automated CI/CD pipelines with GitHub Actions, cutting deployment time by 40%.

  • Enhanced monorepo scalability with NPX scripts, optimizing build flows and developer experience.

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Contact Me

I’m always open to discussing product design work or partnerships.

Feel free to reach out to me via the following channels: