Software Engineer (Mobile

Job Description

Rakuten International is a division of Rakuten Group, Inc., a Japanese global technology leader in services that empower individuals, communities, businesses and society. Headquartered in San Mateo, California with more than 4,000 employees worldwide, the Rakuten International business portfolio includes market leaders in e-commerce, digital marketing, advertising, communications and entertainment. We create products and services that provide exceptional value by aligning members and the businesses that want to engage them in a shared community.

Rakuten is the most rewarding way to shop, giving millions of members Cash Back when they buy from their favorite brands. As a leading shopping platform, Rakuten partners with thousands of top brands across apparel, beauty and wellness, grocery, travel, on-demand services, subscriptions, and dining, helping members save on everyday purchases. Since 1999, Rakuten members have earned more than $4.6 billion in Cash Back, making it the largest Cash Back platform of its kind.

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In this role, you will design, develop, and maintain software applications to meet user needs and business objectives. You will analyze requirements, write clean and efficient code, and collaborate with cross-functional teams to deliver scalable and user-friendly applications. Your role will involve debugging and improving existing applications, ensuring optimal performance, and integrating new features to enhance functionality. With a strong foundation in application development and problem-solving skills, you will contribute to creating innovative solutions that align with organizational goals.

Rakuten Rewards is seeking a Software Engineer 2 (iOS) to join our Apps team, focused on authentication, authorization, and account security within the Rakuten iOS app. The work centers on building and evolving secure access experiences across native iOS functionality and embedded web-based authentication flows, in close connection with backend identity services. Collaboration with product, backend, and security partners is core to the team’s operating model, with meaningful ownership over technical decisions and delivery.

This is a high-visibility opportunity to directly shape how millions of Rakuten members securely access and protect their accounts.

• Administers technical tasks within assigned projects, ensuring adherence to timelines and specifications.
• Analyzes somewhat complex application requirements and provides recommendations for optimal solutions.
• Applies knowledge of software development principles to design and implement functional features.
• Codes and debugs application modules to maintain software performance and reliability.
• Coordinates somewhat complex development activities with cross-functional teams to align with business needs.
• Develops somewhat complex application components, integrating them with existing systems for seamless functionality.
• Implements software updates and patches to improve system performance and security.
• Evaluates software performance metrics and identifies areas for improvement or optimization.
• Recommends enhancements and innovative solutions to improve user experience and system capabilities.

• Manage technical tasks within assigned projects, ensuring adherence to timelines and specifications.
• Analyze requirements and recommend optimal solutions.
• Code, debug, and maintain application modules to ensure performance and reliability.
• Collaborate with cross-functional teams to align development activities with business needs.
• Implement updates and patches to improve performance and security.
• Recommend innovative solutions to improve user experience and system capabilities.

• Build and maintain native iOS security features and web-based authentication flows rendered via WKWebView.
• Implement and maintain bidirectional communication between native iOS code and Web View-based authentication forms.
• Work with native iOS security capabilities including biometric authentication, public key cryptography, and secure key storage via Secure Enclave and Keychain.
• Integrate with backend identity services via RESTful APIs.
• Collaborate with backend, product, security, and UX partners to deliver authentication experiences that are secure, reliable, and user-friendly.
• Participate in code reviews, providing and incorporating constructive feedback.

• Write robust, testable, and maintainable code following MVVM architecture and team standards.
• Contribute to test coverage using Swift Testing and XCTest.
• Work within Xcode Cloud CI/CD pipelines to ensure reliable builds, tests, and deployments.
• Proactively identify technical risks and propose pragmatic solutions.
• Take ownership of iOS-specific decisions and serve as the iOS engineering voice on the team.

• Leverage AI tools as a standard part of daily development, including AI‑assisted code generation,…