Join a leading global internet services company as a Senior Mobile SDK Engineer, developing secure and high-performance eKYC mobile SDKs for iOS and Android within a large-scale digital ecosystem used by hundreds of millions of users.

In this role, you will take ownership of the architecture, development, and optimisation of mobile SDKs that enable secure identity verification and seamless third-party integration. With a primary focus on iOS development using Swift and Objective-C, you will work closely with backend, security, and product teams to build reliable SDK solutions that meet demanding performance, privacy, and security requirements.

This is an opportunity to deepen your expertise in mobile SDK development, iOS security, eKYC, identity verification, and mobile application security while contributing to digital infrastructure operating at global scale.
Key Responsibilities

• Architect, develop, and maintain high-performance eKYC mobile SDKs for iOS, with supporting development and coverage for Android platforms.
• Build secure and reusable SDK components for third-party integrations while ensuring compliance with app store requirements, privacy standards, and mobile security practices.
• Collaborate with backend engineers, security specialists, and product teams to define SDK architecture, technical interfaces, behaviours, and integration requirements.
• Optimise SDK performance, memory usage, stability, and reliability across different mobile devices and operating system versions.
• Create clear technical documentation, sample code, and integration guides, conduct code reviews, and provide technical support to internal engineering teams and SDK users.

Required Skills and Qualifications Experience:

• 5+ years of professional mobile application development experience, with deep expertise in Swift and Objective-C.
• Proven experience developing mobile SDKs, frameworks, system-level libraries, or cross-platform architectures.
• Strong hands-on experience with iOS security technologies, including Keychain, Secure Enclave, and data encryption.
• Experience designing reusable mobile components and technical interfaces for integration into third-party applications.
• Strong understanding of mobile application performance, memory management, stability, and secure software development practices.

Soft Skills:

• Excellent problem-solving abilities combined with a high degree of technical independence and ownership.
• Strong cross-functional communication skills for collaborating with backend, security, product, and mobile engineering teams.
• Collaborative mindset with the ability to answer technical questions and support internal engineers and integration partners.
• Ability to communicate complex mobile architecture and security concepts clearly to both technical and cross-functional stakeholders.

Language Requirements:

• Japanese: Intermediate / Business level.
• English: Professional fluency preferred for cross-functional and international collaboration.
• Chinese: Professional fluency may also be considered for team communication.

Preferred Skills & Qualifications

• Experience with Android development using Kotlin or Java, or designing cross-platform mobile SDK architectures.
• Previous experience within fintech, eKYC, digital identity verification, cryptography, or mobile security.
• Proven experience supporting external or third-party developers with SDK integration and implementation.
• Knowledge of mobile privacy requirements, app store compliance, authentication, encryption, and secure data handling.
• Experience developing SDKs or mobile infrastructure for high-traffic, large-scale digital platforms.

About the Company
Our client is a leading global internet services and technology company operating large-scale digital platforms that serve hundreds of millions of users.

Engineers work in an international and technology-driven environment where mobile security, digital identity, scalable infrastructure, and SDK engineering play an important role in supporting the company's expanding digital ecosystem.

This position offers the opportunity to contribute to high-impact mobile infrastructure while working with modern technologies and engineering teams focused on continuous innovation, security, reliability, and scalability.
Why You'll Love Working Here

• Work on eKYC and mobile identity verification technology supporting a large-scale global digital ecosystem.
• Develop specialist expertise across Swift, Objective-C, iOS SDK development, mobile security, encryption, and digital identity.
• Enjoy a flexible hybrid work model with four days in the office and one day working from home.
• Access an on-site employee food hall with daily meals provided for added convenience.
• Work in a modern, international engineering environment with a casual dress culture and opportunities to collaborate with experienced technology professionals.

Don't Miss Out - Apply Now!