iOS & Android Lead Engineer

Job Title: iOS/Android Lead Engineer

Seniority: Staff / Lead

Location: San Francisco, CA

Employment: Full- time Only | NO C2C, W2 contract roles

Visas Accepted: H1 Transfers, H4EAD, USC, L2 EAD, TN

About the Opportunity

We are seeking an experienced Staff / Lead Mobile Engineer to help design and build a next-generation mobile experience for a global financial technology platform. The product combines traditional financial services with digital assets, enabling seamless cross-border payments and digital wallet experiences.

This role offers the opportunity to take ownership of mobile architecture, develop high-quality customer-facing applications, and influence technical decisions across iOS and Android. The ideal candidate combines strong hands-on engineering skills with technical leadership, product ownership, and a focus on security, performance, and scalability.

Key Responsibilities

• Lead the architecture, design, development, and evolution of mobile applications across iOS and Android.
• Develop high-quality native mobile experiences using Swift, SwiftUI, UIKit, Kotlin, and modern Android frameworks.
• Establish scalable mobile architecture, reusable components, modular frameworks, and engineering best practices.
• Own major product initiatives from technical discovery and design through implementation, testing, release, and production monitoring.
• Collaborate closely with Product, Design, Backend, and Security teams to deliver seamless end-to-end customer experiences.
• Integrate REST APIs and backend services while ensuring reliable data handling and efficient network communication.
• Implement secure authentication, authorization, token management, and sensitive-data storage mechanisms.
• Identify and resolve performance bottlenecks, crashes, memory issues, and reliability challenges.
• Establish and maintain automated testing, code review, CI/CD, and release management practices.
• Mentor engineers, conduct architecture reviews, and contribute to the long-term mobile technology roadmap.
• Make informed technical decisions about shared mobile functionality and platform-specific implementations.

Required Qualifications

• 5+ years of professional experience developing and shipping consumer-facing mobile applications.
• Production development experience across both iOS and Android, with deep expertise in at least one platform and meaningful hands-on experience with the other.
• Strong native iOS development skills using Swift, SwiftUI, and UIKit.
• Practical Android development experience using Kotlin, Jetpack Compose, and/or Android Views.
• Strong understanding of mobile architecture patterns, including MVVM, Clean Architecture, modular design, and dependency injection.
• Experience with REST APIs, mobile/backend integration, Git, automated testing, CI/CD, and modern software development practices.
• Experience with asynchronous programming, concurrency, application lifecycle management, and mobile performance optimization.
• Ability to take ambiguous requirements and deliver production-ready features with minimal supervision.
• Demonstrated technical ownership, problem-solving skills, and effective collaboration across engineering and product teams.

Mobile Architecture and Engineering

• Experience designing reusable frameworks, shared components, and modular mobile applications.
• Knowledge of Swift concurrency, including async/await and Combine; familiarity with Kotlin Coroutines and Flow.
• Experience with networking, caching, offline functionality, low-connectivity scenarios, and error recovery.
• Proficiency in unit testing, UI testing, code reviews, release management, and production monitoring.
• Ability to optimize application startup time, rendering, memory usage, network efficiency, battery consumption, and crash rates.
• Understanding of platform-specific design conventions and accessibility best practices.

Security and Reliability

• Experience with iOS Keychain and secure storage solutions; familiarity with Android Keystore or equivalent technologies.
• Understanding of biometric authentication, OAuth, token and session management, encryption, authentication, and authorization.
• Familiarity with certificate pinning and secure API communication.
• Experience developing reliable applications that handle sensitive information and security-critical workflows.
• Strong focus on application stability, secure data handling, and production quality.

Preferred Qualifications

• Experience in fintech, banking, digital payments, digital wallets, wealth management, or cryptocurrency products.
• Exposure to stablecoins, digital assets, cross-border payments, or related financial infrastructure.
• Experience working in early-stage or high-growth technology companies.
• Previous ownership of mobile architecture or technical direction across multiple engineers or teams.
• Strong product sense and the ability to balance customer experience, security, performance, and business requirements.
• Full-stack development experience or a strong understanding of backend systems.

What Success Looks Like

• Delivering secure, scalable, and reliable mobile experiences across iOS and Android.
• Establishing a maintainable mobile architecture that supports rapid product development.
• Taking end-to-end ownership of key product features and technical initiatives.
• Improving application performance, stability, and overall customer experience.
• Providing technical leadership and helping establish engineering standards across the mobile team.