Goodword
Staff Mobile & AI Platform Engineer
- My contribution
- Architected the React Native and Expo mobile platform, including custom C++ Nitro Modules for high-concurrency AI workloads.
Staff React Native & Mobile Platform EngineerRemote · Brazil · US & EMEA
João Paulo Costa Marra
First mobile hire or lean-team owner for reliable React Native products.
- React Native · Expo · TypeScript
- Remote from Brazil (UTC−3)
- Overlaps US & EMEA hours
Staff React Native engineer in Expo and TypeScript, working remotely from Brazil with US, EMEA, and LATAM teams. I join as the first mobile hire or hands-on owner on a lean team and turn unclear product needs into reliable iOS and Android releases — architecture, APIs, testing, EAS/OTA, observability, and App Store / Play Store delivery. 16+ years shipping, including a 90% engagement lift from a legacy-to-Expo modernization.
Remote availabilityRemote from Brazil (UTC−3) · Full overlap with LATAM · Daily overlap with US and EMEA hours
Selected products
Live on the store
Available for new roles· Notice period: 30 days
01 / Impact
Measured outcomes from shipped mobile releases.
Production outcomes from modernization, native performance, release engineering, and technical leadership.
- Lead outcome90%more mobile engagement
- Legacy-to-Expo modernization
- ~40%better computation
- C++ Nitro Module hot paths
- 75%less technical debt
- Shared platform foundations
- 30%faster deployments
- EAS, OTA, and observability
- 26engineers led
- Healthcare modernization
- 16+years shipping
- Mobile and web products
02 / Work
React Native products live on the App Store and Play Store.
Each role is paired with the App Store product or live website it helped move forward.
Post Op
Staff Mobile Architect
- My contribution
- Led a six-engineer legacy-to-Expo modernization across the patient and clinician apps, increasing mobile engagement by 90%.
Gopuff
Senior Frontend Developer
- My contribution
- Owned shared web and mobile foundations that reduced technical debt by 75% and helped release cycles move 30% faster.
Medify Ltd
Senior Frontend Developer
- My contribution
- Delivered React and TypeScript work across web and desktop healthcare surfaces in a 12-engineer initiative.
Znipe Esports
Senior Frontend Engineer
- My contribution
- Modernized a legacy jQuery streaming product into a React and TypeScript architecture.
Triggy
Lead Mobile Engineer
- My contribution
- Re-architected a legacy Expo system into a scalable React Native foundation for sports-data applications.
OLX Group
Senior Frontend Engineer
- My contribution
- Delivered web development for the Property module of the dubizzle classifieds platform.
03 / Expertise
React Native, Expo, TypeScript, and the native layer underneath.
From product UI to C++ hot paths, with the delivery systems that connect them.
Stage01Product surface
Mobile foundations
Cross-platform architecture designed for teams that need to move quickly without sacrificing native quality.
- React Native
- Expo
- TypeScript
- New Architecture
- Fabric
- iOS
- Android
Stage02Native runtime
Native performance
Measured optimization at the boundary between JavaScript, native platforms, and demanding product workloads.
- C++
- JSI
- Nitro Modules
- Swift
- Kotlin
- Native modules
- On-device AI
Stage03Delivery operation
Delivery systems
Release and observability practices that turn a codebase into a dependable product operation.
- EAS
- OTA
- CI/CD
- Maestro
- Sentry
- App Store
- Play Store
Open source · 02 repositories highlighted
Production problems, solved in the open.
Focused tools for React Native performance and developer workflow — small enough to understand, useful enough to ship.
01 / 02
react-native-nitro-markdown
C++ Nitro Module for markdown parsing off the JS thread — built for LLM and chat UIs.
View repository02 / 02
inline-blame-mini
Lightweight inline git blame tooling.
View repository04 / Experience
16+ years building and leading mobile delivery.
A concise record of first-mobile-hire and lean-team ownership across architecture, implementation, and release delivery.
Goodword
Staff Mobile & AI Platform Engineer
Improved critical-path computational efficiency by 40% with custom C++ Nitro Modules for auth, secure storage, and markdown rendering.
Scope and technical context
- Led a four-engineer product team while owning delivery, release quality, and performance-first React Native architecture.
- Shipped on-device LLM inference with C++ optimizations for native-level latency.
- Delivered retrieval-backed AI features connecting grounded output to production mobile surfaces.
- React Native
- Expo
- TypeScript
- New Architecture
- Nitro Modules
- C++
- On-device AI
- EAS
- OTA
- Sentry
Post Op
Staff Mobile Architect
Increased user engagement by 90% with a legacy-to-Expo modernization delivered by a six-engineer mobile team.
Scope and technical context
- Shipped a complete UI redesign and feature expansion with faster rendering and simpler state management.
- Integrated AI and retrieval-backed features using TypeScript, APIs, and custom native bridges.
- React Native
- Expo
- TypeScript
- EAS
- Mobile architecture
- Native bridges
- API integration
- AI product features
- E2E testing
Gopuff
Senior Frontend Developer
Cut technical debt by 75% with a shared web and mobile component foundation adopted across commerce and logistics products.
Scope and technical context
- Cut deployment cycles by 30% through Next.js and Cypress modernization with a four-engineer frontend team.
- Raised application performance and product quality by integrating diagnostic tooling.
- React Native
- React Native Web
- React
- Next.js
- TypeScript
- Component libraries
- Design systems
- Cypress
- CI/CD
Medify Ltd
Senior Frontend Developer
Delivered React and TypeScript web and desktop healthcare surfaces inside a 12-engineer initiative.
Scope and technical context
- Built a C++ WYSIWYG content-management workflow so non-technical teams could publish regulated content directly.
- Established the monorepo and automated CI/CD pipeline behind critical healthcare features.
- React
- TypeScript
- C++
- Monorepo
- CI/CD
- Healthcare technology
- TDD
- Automated testing
Znipe Esports
Senior Frontend Engineer
Raised automated coverage to near-complete with Jest and Cypress strategies on a high-traffic esports platform.
Scope and technical context
- Modernized a legacy jQuery application into a high-performance React and TypeScript architecture.
- Reduced production bug reports and improved release stability.
- React Native
- Next.js
- React
- TypeScript
- JavaScript
- Jest
- Cypress
- TDD
Triggy
Lead Mobile Engineer
Re-architected a legacy Expo system into a scalable React Native and TypeScript platform for international sports-data products.
Scope and technical context
- Led the JavaScript-to-TypeScript migration that improved robustness and developer onboarding.
- Reduced production bugs across multiple international client products.
- React Native
- Expo
- TypeScript
- Mobile architecture
- TDD
- E2E testing
- International product delivery
OLX Group
Senior Frontend Engineer
Delivered the Property module of dubizzle.com, one of the largest classifieds platforms in the MENA region.
Scope and technical context
- Reached complete automated test coverage on critical listing and property flows.
- Migrated the module from jQuery toward a microservices-ready React architecture.
- React Native
- React
- JavaScript
- Node.js
- Frontend architecture
- Marketplace platforms
- Test automation
- TDD
UnitedHealth Group
Lead Software Engineer
Built the business unit’s first bare React Native app and defined its initial mobile architecture.
Scope and technical context
- Led 26 frontend developers through React adoption, migration strategy, review standards, and an internal component system.
- Modernized critical healthcare workflows from jQuery and Bootstrap into reusable React interfaces.
- React
- React Native
- JavaScript
- Frontend architecture
- Healthcare technology
- Component systems
- Technical leadership
Multiple Companies
Independent Software Consultant · Full-stack Engineering
Delivered full-stack products for healthcare, e-commerce, and enterprise clients across PHP, Node.js, and SQL stacks.
Scope and technical context
- Modernized legacy systems into maintainable web and API platforms used by large audiences.
- Owned discovery, architecture, implementation, integrations, testing, and release on every engagement.
- JavaScript
- Node.js
- PHP
- Laravel
- Magento
- WordPress
- SQL
- MongoDB
- REST APIs
05 / Questions
Remote Staff React Native, answered.
What recruiters and founders ask before the first call.
- Are you available for remote Staff React Native roles?
- Yes. I work remotely from Goiânia, Brazil, and I’m available for Staff, Senior Staff, Principal, and first-mobile-hire roles with a 30-day notice period.
- Which time zones do you overlap with from Brazil?
- Brazil sits at UTC−3, which shares the full working day with LATAM, most of the US working day, and the EMEA afternoon.
- What does “first mobile hire” mean in practice?
- I stand the mobile platform up from nothing: React Native and Expo foundations, architecture, API contracts, EAS builds, OTA updates, observability, and the first App Store and Play Store releases — then hand a lean team a codebase they can keep shipping.
- What is your core stack?
- React Native, Expo, and TypeScript on the New Architecture, with C++ Nitro Modules and native Swift or Kotlin when a hot path needs it, plus EAS, OTA, Sentry, and Maestro for delivery.