Senior Mobile Developer – Android/iOS

This role is four days onsite at our Seneca One Buffalo, NY location, with the flexibility to work from home one day per week

We are seeking a Senior Mobile Developer to join our mobile engineering team focused on delivering secure, scalable, and user-friendly banking applications. This role is ideal for an experienced mobile engineer with strong expertise in either Android or iOS development, with preference given to candidates who have experience across both platforms.

The ideal candidate will have hands-on experience building enterprise-grade mobile applications, preferably within banking, fintech, or other regulated industries. They will possess a strong understanding of secure mobile development practices, automated testing, modern development frameworks, and the ability to work independently with minimal supervision while contributing to technical leadership within the team.

• Design, develop, and maintain mobile applications for banking and financial services on Android and/or iOS platforms.
• Build high-quality native applications using Android technologies (Java, Kotlin) and/or iOS technologies (Swift, SwiftUI, UIKit, Objective-C).
• Collaborate with product managers, designers, architects, backend engineers, and other cross-functional partners to deliver exceptional customer experiences.
• Experience implementing secure mobile applications, including secure credential/token handling, encryption, certificate/network security, biometric authentication, secure local storage, protection of sensitive data, and secure API communication.
• Familiarity with mobile application security principles and common mobile threats, including OWASP Mobile Application Security / MASVS concepts.
• Experience integrating mobile applications with RESTful APIs and backend services, including authentication, error handling, caching, serialization, and resilient network communication.
• Develop and maintain automated tests to ensure application reliability, performance, and maintainability.
• Troubleshoot and resolve complex production issues using application logs, crash data, diagnostics, and performance analysis, with emphasis on root-cause identification and preventative remediation.
• Work autonomously, managing priorities and delivering results in a fast-paced environment.
• Mentor engineers, conduct code and design reviews, and contribute to technical leadership, architecture decisions, engineering standards, and mobile development best practices.
• Stay current with mobile development trends, frameworks, tools, and emerging technologies across Android and iOS ecosystems.
• Design, improve, and support CI/CD pipelines, build automation, code-quality controls, and mobile application release processes.
• Understand and adhere to the Company's risk and regulatory standards, policies, and controls in accordance with the Company's Risk Appetite. Identify risk-related issues requiring escalation to management.
• Promote an environment that supports a culture of belonging and reflects the M&T Bank brand.
• Monitor and improve application performance, stability, startup time, memory utilization, responsiveness, and production reliability.
• Maintain internal control standards, including timely implementation of audit findings and remediation activities.
• Complete other related duties as assigned. 

o Native mobile architecture

o Secure coding

o REST APIs

o Testing

o CI/CD

o Git/source control

o Accessibility

o Performance/reliability

o Production troubleshooting

o Architecture/design patterns

o Mentoring/code reviews

o Android Specialization

 Android SDK / Android platform APIs

 Kotlin Coroutines and Flow

 Jetpack libraries

 Dependency injection such as Hilt/Dagger

 Gradle

 Application lifecycle and state management

 Jetpack Compose

 Java/XML modernization where relevant

o iOS Specialization

 iOS SDK/frameworks

 Swift Concurrency (async/await)

 Combine where applicable

 Swift Package Manager

 Cocoa Touch/Foundation

 Application lifecycle/state management

 SwiftUI

 UIKit

 Objective-C interoperability/migration

• Associate’s degree and a minimum of 5 years’ systems analysis and/ or application development work experience or Bachelor's degree and a minimum of 3 years’ systems analysis and/ or application development work experience. In lieu of degree, a combined minimum of 7 years’ education and/or relevant work experience, including a minimum of 3 years’ systems analysis and/or application development work experience
• Advanced proficiency in minimum of 1 relevant programming language.

• Experience working in banking, fintech, or other highly regulated industries.
• Demonstrated experience designing and evolving modular mobile application architectures with clear separation of concerns, maintainability, testability, and scalability. Experience with architecture patterns such as MVVM, MVI, Clean Architecture, or comparable patterns.
• Experience with automated testing frameworks such as:
  • Android: Espresso, JUnit, Mockito
  • iOS: XCTest, Quick, Nimble
• Familiarity with secure mobile development practices, including encryption, secure storage, biometric authentication, and application security controls.
• Experience developing applications on both Android and iOS platforms.
• Experience with modern UI frameworks such as Jetpack Compose and/or SwiftUI.
• Familiarity with modern build systems and development tooling.
• Experience with platform-specific build and dependency-management tooling such as Gradle on Android and Swift Package Manager/Tuist on iOS.
• Experience with CI/CD pipelines, DevOps practices, and automated deployment processes.
• Knowledge of accessibility and compliance standards, including ADA and WCAG.
• Experience integrating with banking, payments, identity, fraud, or other financial-services APIs.
• Experience using mobile application monitoring, crash reporting, profiling, and performance-analysis tools.
• Published applications in the Google Play Store and/or Apple App Store.
• Experience leading technical initiatives, mentoring developers, and contributing to mobile architecture decisions.