Cocos
Frontend Expert
Shaping the frontend and mobile architecture that product teams build on.
- Member of the Architecture team
- Defining foundations for mobile applications at enterprise scale
- Mobile Application Development
- Mobile Enterprise
Joaquín Stok — React Native Specialist for hireBased in Argentina
React Native expert.C++, Swift & Kotlinunder the hood.
I build and scale React Native apps, and write the native code they need: C++ on the New Architecture, Swift on iOS and Kotlin on Android.
About
Six years shipping React Native products — leading teams, designing app architectures and dropping into C++, Swift or Kotlin whenever an app needs native code.
Services
React Native first, native code when it counts.
React Native development
Apps built end to end: architecture, navigation, state, CI/CD and over-the-air updates.
- Architecture
- Navigation
- State
- CI/CD
- OTA updates
New Architecture & C++
C++ Turbo Modules and JSI bindings on React Native's New Architecture, for the parts where JavaScript is not enough.
- C++
- Turbo Modules
- JSI
- New Architecture
Swift & Kotlin native code
Native modules, features and integrations in Swift for iOS and Kotlin for Android, wired into your React Native app.
- Swift
- Kotlin
- Expo Modules
- Integrations
Audits & architecture
A deep look at your codebase and performance, with a clear plan for what to fix first.
- Code analysis
- Performance
- Roadmap
Design system scaling
Tokens and component libraries that keep several apps and teams consistent as they grow.
- Tokens
- Components
- Multi-app
Stack & expertise
The tools I build with, across the whole product.
Mobile
- React Native
- New Architecture
- Turbo Modules
- JSI
- Expo
- Expo Modules
- React Native CLI
- iOS
- Android
Languages
- TypeScript
- C++
- Swift
- Kotlin
- Solidity
Backend & platform
- Node.js
- NestJS
- Hono
- Effect
- TanStack Start
- Convex
- Cloudflare
Selected work
Altatienda
Frontend Lead
Built a full e-commerce application from scratch — from CI/CD and architecture to the backend-for-frontend.
- Led a team of three developers
- Designed the architecture and design system
- Implemented navigation, push notifications and OTA updates
- Built the BFF with Hono
- React Native
- Hono
- CI/CD
- Design System
- OTA Updates
Light-it
Mobile Engineer
Healthcare application for pregnant women in the US.
- Designed the core app architecture
- Navigation, storage, server state and client state
- Set up CI/CD from day one
- React Native
- CI/CD
- Server State
- Client State
n1u
Technical Lead
Migrated a complex fintech wallet from a third-party provider to an in-house codebase.
- Led a 13-person migration team
- Moved a provider-built app to an in-house solution
- FIAT, crypto, exchange and an international prepaid Visa card
- Internal rewards store, KYC and authentication
- React Native
- Fintech
- KYC
- Auth
- Team Leadership
Launch Consulting Group
Frontend Developer
Real-time monitoring for renewable energy infrastructure.
- Web admin panel for monitoring solar panel farms
- Live telemetry per panel
- Wind gusts, temperature and operational status metrics
- Next.js
- React.js
- TypeScript
ABstract Solutions
Front End Developer
Where it all started: turning designs into fast, consistent web experiences.
- Aligned web design with user experience requirements
- Optimized pages for maximum performance
- Kept brand consistency across every page
- Worked side by side with back-end, graphic and UX designers
- HTML
- CSS
- JavaScript
- UX
Clients
Companies bring me in to audit, build and scale their mobile products.
Pulso Health
Mobile analysis & audit
Nutriva
Mobile development
CloudX
Solidity Engineer
…and many more, across mobile development and design system scaling.
- Years building products
- 6+
- Industries
- 6
- Fintech · Healthcare · E-commerce · Logistics · Energy · Web3
- Companies & clients shipped for
- 9+
Need a React
Native expert?
Let's talk.
React Native, plus C++, Swift and Kotlin when it has to go native — tell me about your project and I'll get back to you.