Johann G.

Are you looking for a senior frontend developer who can turn complex requirements into high-performance web platforms and mobile apps? I am a Senior Frontend Engineer with 5+ years of experience delivering production-grade applications across healthtech, mining simulations, agriculture data systems, and enterprise omnichannel communications. Whether you are building an MVP from scratch, modernizing a legacy codebase, or scaling a cross-platform mobile app, I deliver clean, modular, and accessible frontend architecture. What I bring to your project: • Modern Web Applications: End-to-end frontend development using React 19, Vue 3, TypeScript, and Tailwind CSS. • Cross-Platform Mobile Apps: Building and publishing iOS & Android applications with React Native and Expo. • Architecture & Migrations: Decoupling legacy codebases, migrating architectures (e.g., Vue 2 to Vue 3, micro-frontends), and enforcing strict typing. • Complex Data & State Management: Crafting interactive dashboards, large-dataset import pipelines, and real-time state synchronization. • Full-Stack Integrations: Integrating frontend clients seamlessly with Supabase, NestJS, REST APIs, and backend microservices. • Accessibility (a11y) & Performance: WCAG-compliant UI engineering and high-speed core web vitals. Selected Project Highlights: • Enterprise Communications (WeON): Engineered micro-frontends and migrated core architecture to Vue 3 during the v5 AI/XRM platform transition. • Child Healthtech (PsiUapp): Built and shipped a gamified emotional tracking mobile app on iOS/Android using React Native and Expo. • Mining Simulation (Truss Mine One): Created interactive planning and equipment productivity simulation interfaces in React and TypeScript. • Agricultural Registry (Apassul): Developed high-volume data ingestion, validation, and analytics dashboards backed by Supabase. • US Healthcare Workflow (Reside Admissions): Modernized legacy React codebases, boosting tablet responsiveness and improving accessibility by 30%. Core Tech Stack: • Frontend: React, React Native, Vue.js (Vue 2 & Vue 3), TypeScript, JavaScript, Elm, Vite, TanStack Query • Styling & Design Systems: Tailwind CSS, Vuetify, SCSS, Styled Components, PostCSS • Backend Integration: Supabase (Auth, Edge Functions, PostgreSQL), Node.js, NestJS, REST APIs Let's discuss how I can help you build or scale your product. Send me an invite or a message with your project details!