Senior Mobile Developer (iOS)

New Senior Mobile Developer (iOS) Belfast, Northern Ireland; Apply Signifyd is hiring a Senior Mobile Developer (iOS) to contribute to our core mobile technology. This is a unique opportunity to engage deeply with parts of the iOS operating system that few engineers get to explore. In this role, you will have substantial autonomy as our primary iOS expert, working alongside a dedicated Android engineer on foundational components at the heart of our product. The ideal candidate is a meticulous engineer who thrives on solving complex problems and delivering those solutions to customers. We're looking for someone with a passion for creating robust, well-tested, and elegantly documented code. You will work in a highly collaborative environment with our Android, backend, web, and product teams to build and deliver software used by millions of end users around the world. What You'll Do Design, develop, and maintain critical mobile components in both Swift and Objective-C . Go beyond surface-level development to explore the depths of the iOS platform, including low-level APIs, performance optimization, memory management, and background processing. Build and maintain a robust testing suite (unit, integration, and E2E) and fully automate our build, testing, and release processes using CI/CD pipelines. Investigate and solve unique and challenging technical problems that require deep research and first-principles thinking. Act as the subject matter expert for all things iOS, providing technical guidance and helping to shape our long-term mobile strategy. Work closely with Android, web, backend, and product teams to ensure seamless integration of your iOS components with many other aspects of Signifyd’s technology stack. Create and maintain clear, comprehensive technical documentation for your iOS products. Collaborate with our Android team to ensure consistency and architectural alignment across platforms. What You'll Need Extensive professional experience in native iOS development with strong proficiency in both Swift and Objective-C . Demonstrable experience building foundational, reusable mobile components, libraries, or frameworks. A strong understanding of API design principles and a passion for creating clean, maintainable, and robust code. Deep knowledge of mobile testing methodologies and frameworks (e.g., XCTest, XCUITest). Hands-on experience implementing and managing CI/CD pipelines for mobile development (e.g., GitHub Actions, Jenkins, Fastlane). Exceptional problem-solving skills, a curious mindset, and meticulous attention to detail . Excellent communication and documentation skills, with the ability to collaborate effectively in a cross-functional team environment. Experience with cross-platform frameworks (e.g., React Native, Flutter, Xamarin ) and/or native Android development is a significant plus. #LI-Remote   Our UK benefits: Stock Options Annual Performance Bonus or Commissions Pension matched up to 8% ‘Day one’ access to great health, dental and optical insurance scheme  Generous annual leave plus public holidays Cycle to Work Scheme Enhanced maternity and paternity leave (12 weeks full-pay for mums & dads, plus 12 weeks half-pay for mums) Regular paid social events organized by our social committee  On-Demand Therapy for all employees & their dependents Dedicated learning budget through Learnerbly We are committed to equality of opportunity for all staff and applications from individuals are encouraged regardless of age, disability, sex, gender reassignment, sexual orientation, pregnancy and maternity, race, religion or belief and marriage and civil partnerships. 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