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. I integrate on-device AI and RAG-style retrieval-backed UX at the product/API layer.

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. Proof: +90% mobile engagement at Post Op; ~40% critical-path efficiency via C++ Nitro at Goodword; first bare React Native app and led 26 at UnitedHealth Group. I ship on-device AI and RAG-style UX at the product/API layer. 16+ years shipping as a hands-on staff IC.

See shipped work Start a conversation

Remote availabilityRemote from Brazil (UTC−3) · Full overlap with LATAM · Daily overlap with US and EMEA hours

Goiânia, Goiás, Brazil
Remote · US, EMEA & LATAM
LinkedIn
GitHub

Selected products

Live on the store

Goodword mobile app showing an AI-assisted networking conversation

GoodwordApp Store

Post OpApp Store

GopuffApp Store

Available for new roles· Notice period: 30 days

01 / Impact

Measured outcomes from shipped mobile releases.

The three hire-scan proofs first: Post Op engagement, Goodword Nitro efficiency, and UnitedHealth Group’s first bare React Native app.

Lead outcome90%more mobile engagement: Legacy-to-Expo modernization
~40%better computation: C++ Nitro Module hot paths
26engineers led · first bare RN: UnitedHealth Group business unit
75%less technical debt: Shared platform foundations
30%faster deployments: EAS, OTA, and observability
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.

GoodwordApp Store

Goodword

Staff Mobile & AI Platform Engineer

Aug 2025 — PresentUnited States

My contribution: Owned Expo / React Native / TypeScript delivery; built C++ Nitro Modules that improved critical-path efficiency by ~40%; shipped on-device AI and RAG-style UX at the product/API layer while leading a 4-engineer team.

Post OpApp Store

PO ClinicianApp Store

Post Op

Staff Mobile Architect

Feb 2024 — Sep 2025London Area, United Kingdom

My contribution: Led a six-engineer legacy-to-Expo modernization across the patient and clinician apps, increasing mobile engagement by 90%.

GopuffApp Store

Gopuff DriverApp Store

Gopuff

Senior Frontend Developer

Oct 2022 — Feb 2024United States

My contribution: Owned shared web and mobile foundations that reduced technical debt by 75% and helped release cycles move 30% faster.

Medify medical admissions learning website home page

MedifyLive website

Medify Ltd

Senior Frontend Developer

Mar 2022 — Oct 2022Remote

My contribution: Delivered React and TypeScript work across web and desktop healthcare surfaces in a 12-engineer initiative.

Znipe.tvLive website

Znipe Esports

Senior Frontend Engineer

Sep 2021 — Apr 2022Stockholm, Sweden

My contribution: Modernized a legacy jQuery streaming product into a React and TypeScript architecture.

Triggy Live ScoreProduct website

Triggy

Lead Mobile Engineer

Sep 2019 — Sep 2021Stockholm, Sweden

My contribution: Re-architected a legacy Expo system into a scalable React Native foundation for sports-data applications.

dubizzle UAE classifieds website home page

dubizzleLive website

OLX Group

Senior Frontend Engineer

Oct 2018 — Sep 2019Dubai, United Arab Emirates

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
RAG-style UX

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 repository

02 / 02

inline-blame-mini

Lightweight inline git blame tooling.

View repository

04 / 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

Aug 2025 — Present

United States

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 RAG-style retrieval-backed AI at the product/API layer, 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

Feb 2024 — Sep 2025

London Area, United Kingdom

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 RAG-style retrieval-backed features at the product/API layer using TypeScript, APIs, and custom native bridges.

React Native
Expo
TypeScript
EAS
Mobile architecture
Native bridges
API integration
RAG-style AI
E2E testing

Gopuff

Senior Frontend Developer

Oct 2022 — Feb 2024

United States

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

Mar 2022 — Oct 2022

Remote

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

Sep 2021 — Apr 2022

Stockholm, Sweden

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

Sep 2019 — Sep 2021

Stockholm, Sweden

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

Oct 2018 — Sep 2019

Dubai, United Arab Emirates

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

Jan 2016 — May 2018

Curitiba, Brazil

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

May 2010 — Jan 2016

Curitiba Area, Brazil

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. I integrate on-device AI and RAG-style retrieval-backed UX at the product/API layer.