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 4000 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. Learn more at .

Job Summary:

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 teams operating model with meaningful ownership over technical decisions and delivery. This is a highvisibility opportunity to directly shape how millions of Rakuten members securely access and protect their accounts.

Key Responsibilities:

• 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.

Feature Development & Delivery

• 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.

iOS Authentication & Security

• 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 WebView-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.

Engineering Excellence

• 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.

AIEnabled Engineering Practices

• Leverage AI tools as a standard part of daily development including AIassisted code generation refactoring optimization peer review test generation and documentation.

• Follow guardrails and best practices for safe responsible use of AI in engineering ensuring no leakage of sensitive data source code or regulated information.

• Stay current with emerging AIbased engineering tools and apply them where they measurably improve quality consistency or delivery speed.

Qualifications:
To perform this job successfully an individual must be able to perform each essential duty satisfactorily. The requirements listed below are representative of the knowledge skill and/or ability required. Reasonable accommodations may be made to enable individuals with disabilities to perform the essential functions.

• Experience working on authentication identity or accountrelated features in a consumer mobile app.

• Familiarity with mobile security concepts such as token management secure storage and session handling.

• Proficiency in Swift with familiarity in ObjectiveC.

• Experience working with UIKit and/or SwiftUI and modern iOS frameworks.

• Handson experience integrating RESTful APIs and collaborating with backend service teams.

• Familiarity with iOS architecture patterns such as MVC or MVVM.

• Experience writing unit tests using XCTest and participating in code reviews.

• Strong debugging and problemsolving skills particularly in stateful or edgecaseheavy flows.

• Proficiency with Git and collaborative development workflows.

• Clear communication skills and the ability to work effectively within a Squad model.

• Demonstrated ability to work independently make sound technical decisions and drive work to completion with minimal oversight.

• Experience applying native iOS security capabilities (e.g. biometric auth via LocalAuthentication publickey cryptography Secure Enclave / Keychain) in production environments.

• Familiarity with CI/CD workflows for iOS (e.g. Xcode Cloud or similar pipelines).

• Comfort working with modern testing approaches using Swift Testing and/or XCTest including maintaining test quality without reliance on thirdparty frameworks.

• Familiarity with Agile delivery practices and working effectively in crossfunctional squads.

• Experience leveraging AI tools to enhance software development productivity quality or documentation while adhering to responsibleuse guardrails.

Minimum Requirements:

• 2-4 years of professional iOS development experience required

• 5-7 years Preferred

• Bachelors Degree Required

• Masters Degree Preferred

Preferred Requirements

• Experience with WKWebView and native WebView communication patterns (e.g. WKScriptMessageHandler JavaScript bridge).

• Familiarity with OAuth and federated authentication concepts.

• Familiarity with Apple security frameworks such as CryptoKit AuthenticationServices or DeviceCheck.

• Experience working on authentication identity or account security features in a consumer mobile app.

• Experience working on a consumer-facing app at scale.

• Demonstrated experience establishing or following AIassisted engineering standards or developer enablement practices.

• Contributions to open-source iOS projects or a portfolio of published App Store applications.

Five Principles for Success
Our worldwide practices describe specific behaviors that make Rakuten unique and united across the world. We expect Rakuten employees to model these 5 Shugi Principles of Success.

Always improve Always Advance - Only be satisfied with complete success - Kaizen
Passionately Professional - Take an uncompromising approach to your work and be determined to be the best
Hypothesize - Practice - Validate Shikumika - Use the Rakuten Cycle to succeed in unknown territory
Maximize Customer Satisfaction - The greatest satisfaction for our teams is seeing their customers smile
Speed!! Speed!! Speed!! - Always be conscious of time - take charge set clear goals and engage your team

Rakuten is an equal opportunity employer. Accessibility accommodations for candidates with disabilities participating in the selection process are available on request. Any information received related to accommodation needs of applicants will be addressed confidentially.

Rakuten would like to thank all applicants for their interest in this role however only qualified candidates will be shortlisted.

Beware of fraudulent job offers claiming to be from Rakuten. Rakuten does not send unsolicited job offers or request money during the recruitment process. Learn more: the time of posting Rakuten expects the Compensation (base salary discretionary bonus) for this role to be within the range shown below. Individual compensation will vary based on job-related factors including the skills qualifications and experience of the successful candidate as well as business need and geographic location. The successful applicant for this role will be eligible for stock options health vision dental insurance RRSP matching Personal Time Off (PTO) Volunteer Time Off (VTO) and other employee benefits as the company implements.