Senior React Native Engineer at All Cares

About Us
Scrambly is one of the fastest-growing adtech startups in the world, featured in the AppsFlyer Performance Index and Singular ROI Index in just 3.5 years.

We’re growing 250%+ YoY across revenue, team, product, and technology — fully bootstrapped and profitable.

We’re building the future of app discovery: a reward-powered alternative to the App Store and Google Play. Our loyalty-driven ecosystem connects millions of users with the world’s top apps and delivers unmatched, ROI-focused growth for mobile advertisers.

Our mission is to build a true alternative to traditional app stores — fueled by rewards and data — and create a new, performance-first growth engine for mobile app advertisers.

About the Role
We are looking for an experienced Senior React Native Engineer to join the Scrambly mobile team and help build and scale our app for iOS and Android. In this role, you will take full ownership of complex, high-impact features for a high-traffic platform serving millions of users globally. You will also contribute to our web platform built on Next.js, making cross-platform versatility a key part of the role.

Your primary focus will be on writing performant, well-architected TypeScript code within a modern React Native stack. You will play a key role in maintaining app stability, keeping the application fast and reliable. This position offers a direct opportunity to impact business metrics by reducing technical debt and driving performance improvements across the platform.

Success in this role requires strong cross-functional collaboration. You will work directly with Backend, QA, and Product teams to clarify requirements, solve complex engineering challenges, and deliver a seamless UX. Additionally, you will actively contribute to architectural discussions, helping to shape the technical direction of the product alongside the mobile team lead and other senior engineers.

Key Responsibilities

• Design & Implementation:
  • Develop and maintain high-quality cross-platform applications using React Native and TypeScript
  • Build reusable UI components and highly performant lists (utilizing tools like FlashList or FlatList) that strictly adhere to design specifications
  • Integrate mobile apps with backend services via RESTful APIs and WebSockets to ensure real-time data synchronization
  • Debug platform-specific issues using Xcode and Android Studio, and write or modify native modules (Swift/Kotlin) when standard libraries are insufficient
• Engineering Standards & Quality:
  • Champion code quality by writing clean, testable TypeScript code and actively participating in peer code reviews to ensure standards for readability and maintainability are met
  • Contribute to the long-term health of the codebase by identifying and fixing technical debt and improving overall test coverage
  • Actively contribute to architectural discussions, offering well-reasoned input on state management (e.g., Redux Toolkit, Zustand) and navigation patterns to improve scalability
• Performance, Reliability & Collaboration:
  • Monitor production stability using tools like Sentry or Crashlytics, proactively identifying and fixing crashes or errors
  • Optimize app performance by focusing on specific metrics such as frame rates, memory usage, app size, and battery consumption
  • Own and evolve CI/CD pipelines to ensure smooth and reliable releases to the App Store and Google Play
  • Collaborate effectively with non-technical stakeholders to explain technical constraints and propose viable solutions
    

Requirements

• 5+ years of professional software engineering experience, with at least 4 years strictly focused on React Native development
• Strong proficiency in TypeScript and the React Native ecosystem (CLI, Hermes, debugging tools)
• Deep understanding of iOS and Android build systems (Gradle, Pods, signing/provisioning). You must have the ability to both read and write native code (Swift/Kotlin) to debug platform-specific issues
• Deep expertise in modern React patterns (Functional Components, Hooks) and state management libraries (Redux Toolkit, Zustand, or TanStack Query), with a track record of making and defending
• Proven experience writing unit and integration tests using Jest and hands-on experience with End-to-End (E2E) testing using tools like Maestro or Detox
• Ability to explain technical concepts clearly to diverse teams
• Experience with Next.js is a strong advantage. Candidates without prior Next.js experience are welcome, provided they demonstrate a solid React foundation and a clear willingness to learn
• English: Upper-Intermediate (B2) or higher. You need to be able to communicate clearly in English (written and spoken) to work effectively in an international team and participate in architectural discussions

Nice to Have

• Experience launching and maintaining a B2C app with 100k+ Monthly Active Users (MAU)
• Hands-on experience writing Native Modules or JSI/TurboModules from scratch
• Familiarity with mobile analytics tools (Segment, Amplitude) and A/B testing implementation
• Experience with automation tools like Maestro or Appium
• Knowledge of backend fundamentals (Node.js) to debug API integrations effectively
  

What We Offer

• Scale & Impact: Your code will impact millions of users globally. Performance optimizations you implement will translate into immediate value and improved user experience
• Modern Stack: Work with the latest React Native tools and standards (TypeScript, Hermes, etc.) without being bogged down by legacy spaghetti code
• Growth Culture: A collaborative environment with rigorous code reviews and knowledge sharing — we value the best idea, regardless of title or seniority
• Ownership: A high level of ownership where you can see your features go live quickly in a fast-paced environment
• Full-time & fully remote position
• 15 days of paid vacation days
• 5 days of paid days off
• 5 days of paid sick leave
• Maternity/Paternity leave
• National holidays based on the country of your stay