Senior iOS Engineer

About Reactiv

Reactiv is building the future of mobile commerce. A world where the mobile web disappears, and every shopping journey becomes instant, contextual, and native.

Our platform lets brands turn any moment of intent - an ad click, QR scan, LLM search result, or real-world moment - into a fully personalized app experience with zero friction or downloads. Using Apple's App Clips, Reactiv gives marketers a new acquisition surface, a new retention channel, and a new way to build long-term customer relationships through high-intent, push-enabled experiences.

Beyond Clips, Reactiv provides the full stack for next-generation commerce: deep data integration, an AI-driven marketing engine, and tools that let brands deliver richer, higher-converting experiences everywhere their customers are. We’re redefining how brands acquire, convert, and retain customers on mobile, and building the platform that powers the next decade of commerce.

If you want to help shape what comes after the mobile web, we’d love to meet you.

Position Overview

As a Senior Mobile Developer, you will play a pivotal role in the future of our mobile applications and frameworks. From shaping our Reactiv Clips technology to delivering seamless, native app performance, you’ll tackle complex challenges and create scalable, robust solutions that empower merchants worldwide. This role is perfect for a developer who thrives on innovation, loves problem-solving, and wants to make an outsized impact in the world of mobile commerce.

Key Responsibilities

• Design, develop, and maintain advanced App Clip applications for the iOS platform using Swift.
• Collaborate with cross-functional teams to define, design, and ship new features
• Ensure the performance, quality, and responsiveness of applications
• Identify and correct bottlenecks and fix bugs to optimize application performance
• Lead the integration of third-party APIs, with a specific focus on the Shopify ecosystem
• Mentor junior developers, conduct code reviews, and ensure best practices in software development
• Stay informed on the latest industry trends in mobile technologies and test the applications on devices to ensure our products always utilize the best possible techniques and tools

Required Qualifications

Essential Skills

• Strong experience using iOS frameworks and Swift, building, shipping, and maintaining Apple App Clips and native mobile applications in production.
• Strong focus on performance optimization, accessibility, scalability, and quality, alongside a deep understanding of App Clip performance constraints, invocation methods, and App Clip–specific architectural patterns, delivering exceptional user experiences at scale.
• Design, build, version, and maintain reusable XCFrameworks for iOS and Apple platforms, ensuring binary compatibility, multi-architecture support, and seamless integration across multiple Xcode projects via Swift Package Manager.
• Practical experience using AI-assisted coding tools to accelerate development tasks such as scaffolding features, refactoring code, writing tests, and debugging, while maintaining high standards for code quality and correctness.
• Familiarity with the Shopify ecosystem and experience building apps using Shopify APIs
• Advanced understanding of cloud message APIs and usage of push notifications
• Experience maintaining CI/CD pipelines for iOS using Fastlane and Xcode.
• Solid understanding of the full mobile development life cycle
• Excellent problem-solving skills and ability to work in a dynamic and agile environment

Desirable Skills

• Proven expertise in deploying and managing applications, along with extensive interaction with the App Store
• Experience with automated testing platforms and unit tests
• Knowledge of UI/UX design principles and application interface guidelines
  
  *** This role can be remote in Canada or a flexible hybrid model at our office in Toronto ***