Senior React Native Mobile Engineer - Fast, Reliable Apps

OneDayOnly.co.za; Wes-Kaap; On-site; ZAR 900,000 - 1,300,000; Full time

Job summary

OneDayOnly.co.za is seeking an experienced mobile engineer to build and ship consumer-facing apps. You will own features end-to-end across React Native, iOS, and Android, write clean, tested code, and drive performance improvements.

You will mentor peers, contribute to design systems, and help release processes for Apple and Google stores, leveraging CI/CD pipelines for fast, reliable releases.

Qualifications

• 3–5+ years of professional mobile development experience.
• Strong proficiency in React Native — you've shipped production apps with it.
• Solid native mobile experience in Swift/SwiftUI (iOS) and/or Kotlin (Android).
• Proven track record of building and shipping consumer-facing mobile applications.
• Deep understanding of mobile performance optimisation and best practices.
• Experience with CI/CD pipelines for mobile (e.g. Bitrise, Fastlane, GitHub Actions).
• Solid understanding of RESTful APIs and mobile networking patterns.
• Experience implementing designs from Figma or similar design tools with high accuracy.
• Familiarity with App Store and Google Play release processes.
• Experience with e-commerce or high-traffic consumer apps.
• Contributions to open-source mobile projects.
• Experience with GraphQL, WebSockets, or push notification infrastructure.
• Knowledge of accessibility standards (WCAG) in mobile contexts.

Responsibilities

• Design and build high-quality features across React Native, iOS (Swift/SwiftUI), and Android (Kotlin).
• Take ownership of features end-to-end — from technical design through to production release.
• Write clean, well-tested, maintainable code that meets OneDayOnly's engineering standards.
• Participate in code reviews, providing constructive and thorough feedback to peers.
• Identify and resolve performance bottlenecks across app startup, rendering, and network layers.
• Proactively monitor app health metrics and drive continuous performance improvements.
• Champion best practices for memory management, battery efficiency, and smooth UI rendering.
• Maintain and improve mobile CI/CD pipelines to ensure fast, reliable, and automated releases.
• Manage app store submissions (Apple App Store & Google Play) and release processes.
• Contribute to mobile DevOps tooling and automate repetitive operational tasks.
• Design and implement robust API integrations with OneDayOnly's backend services.
• Collaborate with backend engineers to define and evolve mobile-facing APIs.
• Handle complex data flows, caching strategies, and offline-first considerations.
• Implement pixel-perfect UI from design specifications with high fidelity.
• Contribute to and maintain the mobile design system and shared component library.
• Partner with our UX Designer to ensure designs are both feasible and delightful to use.
• Mentor junior and mid-level mobile developers through code reviews and pair programming.
• Share knowledge with the broader engineering team through presentations and documentation.
• Contribute to a culture of continuous learning and technical excellence.

Skills

React Native

Swift

Kotlin

CI/CD pipelines

API integration

UI/UX design

Mentoring

Code reviews

GitHub Actions

Fastlane

Bitrise

Figma

Tools

Bitrise

Fastlane

GitHub Actions

Figma

Job description

OneDayOnly.co.za is seeking an experienced mobile engineer to build and ship consumer-facing apps. You will own features end-to-end across React Native, iOS, and Android, write clean, tested code, and drive performance improvements.

You will mentor peers, contribute to design systems, and help release processes for Apple and Google stores, leveraging CI/CD pipelines for fast, reliable releases.