WK
Standing Rank
Rank Not Available
Developer Badges
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Skills & Technologies
49 skillstypescriptjavascriptpythonhtml5css3reactnext.jsreact nativevue 3reduxpiniaapollo clientnode.jsdjangorestgraphqlceleryredisaxiosreact querytailwind cssshadcn/uimuiradix uiant design ministorybookatomic designjestcypressreact testing librarywcag 2.1arialighthousegitgithub actionsturborepowebpackvitedockerci/cdeslintvercelnetlifyfirebaseawsopenai apianthropic apicursorcopilot
Work Experience
Frontend & Mobile Engineer
SuperNomics
Jan 2026 - Present Remote, San fransisco
- Architected a scalable AI-powered monorepo using Turborepo, establishing shared packages for UI components, API clients, and config , eliminating cross-team integration friction and enabling parallel web and mobile development.
- Engineered a production-grade React Native + Expo mobile app with offline-resilient data patterns and a component architecture optimised for low-end device performance.
- Built and owned a cross-platform shared component library (web + mobile) with design tokens, Storybook documentation, and full accessibility compliance , cutting UI inconsistencies and accelerating feature delivery by 30%.
- Led AI feature architecture decisions, evaluating trade-offs between client-side inference, API-streamed LLM responses, and UX patterns for async AI interactions across product surfaces.
- Translated complex Figma design systems into pixel-perfect, responsive components and integrated RESTful and GraphQL APIs with optimistic UI and robust error handling.
Senior Mobile Engineer
Nesti
Aug 2025 - Jan 2026 Nairobi, Fintech
- Designed and shipped a Safaricom Mini App using Ant Design Mini and JSAPI, architecting the integration layer across multiple third-party payment services , improving user engagement and measurably reducing drop-off at key transaction flows.
- Reduced app load time by 25% on low-end devices through targeted performance interventions: FlatList rendering optimisation, component memoisation, bundle size reduction, and image caching strategies.
- Engineered a React Native rental payment app with end-to-end API integration, secure transaction flows, deep-linked navigation, and resilient state management for seamless cross-device UX.
- Integrated native device capabilities (push notifications, camera, geolocation) within a structured permissions and error-handling architecture, driving measurable uplift in in-app engagement.
- Led API contract design discussions with backend engineers, defining schema standards and error response conventions that reduced frontend integration bugs and shortened delivery cycles.
Frontend Engineer
Leja Limited
Jun 2024 - Oct 2025 Nairobi, Fintech
- Improved Core Web Vitals and reduced app load time by 30% through a systematic performance overhaul: Next.js SSR/ISR, dynamic imports, code splitting, image optimisation, and Webpack bundle analysis.
- Architected and delivered a reusable UI system using ShadCN/UI, Tailwind CSS, Radix UI, and Storybook , introducing design tokens and component documentation standards that unified the platform's design language across teams.
- Built a Safaricom Mini App from scratch using Ant Design Mini and JSAPI, owning the architecture, third-party API integration strategy, and UX decisions that drove higher engagement on the Safaricom SuperApp.
- Designed and shipped USSD menu flows in Django for a loan product, enabling mobile-first onboarding and repayment journeys in low-connectivity regions , contributing to a 15% increase in loan uptake among smallholder farmers.
- Hardened platform security by implementing CSP headers, CSRF/XSS protection, and HTTPS enforcement , reducing the attack surface and aligning with fintech compliance requirements.
- Mentored junior engineers through structured code reviews, pair programming, and architecture discussions; drove Agile delivery across sprint planning, backlog grooming, and cross-functional stakeholder alignment.
Frontend Engineer
The Pathology Network
Jun 2023 - May 2024 Remote, Healthcare
- Built production-ready clinical UIs with React, Tailwind CSS, MUI, and TanStack Table — achieving high Lighthouse scores and full WCAG 2.1 accessibility compliance critical for regulated healthcare environments.
- Improved developer velocity by 30% by designing and shipping a reusable component library with design token systems, reducing redundant implementation and enforcing consistent UI patterns across the platform.
- Implemented CASL for fine-grained, role-based access control across all UI routes and components — ensuring secure, context-aware data visibility in a multi-tenant clinical environment.
- Established automated testing standards using Jest and React Testing Library, instituting unit and integration test coverage as a baseline requirement , reducing production regressions and improving confidence in continuous delivery.
- Optimised data fetching and caching with React Query and memoisation, significantly improving page render times and data hydration speed in data-intensive clinical views.
Frontend Developer
Oaknet Business Limited
Jan 2022 - Mar 2023 Nairobi, SaaS
- Led UI architecture for a SaaS Monitoring & Evaluation platform using React.js, Material-UI, and Redux — delivering dynamic dashboards and reporting tools adopted by enterprise clients.
- Spearheaded the mobile-first frontend of an investment appraisal system using Vue 3, Pinia, and GraphQL, enabling intuitive project-funding workflows across investor and applicant roles.
- Optimised GraphQL query strategies and implemented state normalisation, reducing redundant API calls and improving responsiveness in data-heavy views.
- Mentored 10+ interns through onboarding, code reviews, and pair programming — accelerating team ramp-up and improving sprint delivery by 30% .
Senior Fullstack Developer
Freelance
Oct 2020 - Present Remote
- Architected and shipped React + Next.js applications within Turborepo monorepos, establishing CI/CD pipelines via GitHub Actions , reducing deployment time by 40% and enabling reliable multi-environment releases.
- Delivered AI-integrated web applications using OpenAI and Anthropic APIs, implementing chat, summarisation, and generative features within production Next.js architectures.
- Built an end-to-end IoT smart parking system: React.js dashboard, Node.js/MongoDB backend, Raspberry Pi sensor integration with Python, and a real-time data pipeline via ThingSpeak.
- Established comprehensive automated test suites with Jest and React Testing Library across all major client projects , unit, integration, and snapshot coverage as a standard delivery requirement, reducing production regressions across every engagement.
Projects
Projects Not Populated
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Leaderboard Standings
Leaderboard Position Pending
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Assessment Highlights
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AI Collaboration Score
AI Collaboration Score Pending
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Role Compatibility Profile
Role Compatibility Analysis Pending
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Achievements
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About Details
Professional Bio
Senior Frontend Engineer with 5+ years building production-grade SaaS across fintech, healthcare, and AI startups. Expert in React, TypeScript, Next.js, and React Native, owning architecture end-to-end. Leads through code reviews, mentoring, and testing culture.
Education: Computer Science Engineering (Or Equivalent)
Languages: English, Hindi
Email: Locked
GitHub: https://github.com/winniekagz