Frontend & Mobile Developer
Building polished, user-focused web & mobile products.
I create modern digital experiences with clean UI, smooth UX, and practical product thinking.
🌐 Live Project · 💻 Open Source · ✍️ DEV.to · ☕ Buy Me a Coffee
I'm a developer focused on building modern products that feel fast, intuitive, and refined.
My core strength is frontend development, complemented by mobile and cross-platform work using React Native and Kotlin. I care about software that is not only technically solid, but also useful, lightweight, and pleasant to use from the very first interaction.
- ⚡ Crafting fast, clean, and visually polished interfaces
- 🎯 Strong focus on product thinking over pure technical demos
- 📱 Building mobile apps with React Native and Kotlin
- 🌌 Exploring interactive experiences with Three.js
- 🚀 Growing an open-source portfolio of production-quality projects
A modern hydration tracking app designed to be free, registration-free, and genuinely useful from the first visit.
Highlights
- daily hydration tracking
- frictionless UX with no sign-up required
- polished, real-product feel
- clean interface designed for everyday use
A selection of public projects showcasing my work across modern frontend development, mobile apps, polished UX, and product-focused execution.
Professional, private, and local-first calorie tracker built for speed, privacy, and a modern web experience.
- Stack: React, TypeScript, Vite, Tailwind CSS
- Focus: local-first data, privacy, performance, polished UI
A premium, high-performance explorer for the NASA Exoplanet Archive, built for elegant discovery and scientific storytelling.
- Stack: Astro, React, TypeScript, Tailwind CSS
- Focus: data exploration, static performance, visual storytelling
A native, privacy-first Android P2P chat client for the Cable protocol.
Built as a high-performance Android rewrite focused on decentralized communication, serverless history sync, and local-first data.
- Stack: Kotlin, Jetpack Compose, Material 3
- Focus: native Android, P2P networking, privacy-first UX, local-first architecture
- Highlights: no central servers, no telemetry, direct peer-to-peer communication
- building and refining public web projects
- improving mobile development workflows
- shipping more polished, production-ready software
- expanding open-source presence
- exploring richer UI and interaction patterns
- GitHub → github.com/johnnylemonny
- DEV.to → dev.to/johnnylemonny
- Buy Me a Coffee → buymeacoffee.com/zdfpbnc5iv
Built with clarity, interaction, and a product mindset.