Sr Software Engineer, Mobile Platform

JOB OVERVIEW

The Mobile Platform Engineering team at Legion is responsible for building and evolving the foundational capabilities that power our mobile applications. Our mission is to enable product teams across the company to deliver high-quality features rapidly, while meeting the demands of performance, scalability, and security. As a Senior Engineer on the Mobile Platform team, you will contribute to the design and development of robust, enterprise-grade solutions for both iOS and Android. You’ll leverage your deep technical expertise to ensure our mobile architecture supports millions of end users with best-in-class performance and a seamless user experience. This role is critical to maintaining our technical excellence and scaling our platform for future growth.

RESPONSIBILITIES AND DUTIES

• Own and evolve core mobile frameworks, CI/CD pipelines, automation processes, and deployment strategies to accelerate development efficiency and reliability.
• Manage native integrations such as Push Notifications, App Security, and other platform services that are critical to mobile functionality and user experience.
• Collaborate cross-functionally with product managers, designers, QA, and other engineering teams to analyze, design, and deliver scalable mobile features.
• Participate actively in engineering processes including code reviews, design reviews, sprint planning, daily stand-ups, sprint reviews, and retrospectives.
• Write clean, maintainable, and efficient code that adheres to internal standards and industry best practices across both iOS and Android platforms.
• Drive technical decisions based on data, metrics, and real-world usage to ensure thoughtful, long-term solutions.
• Continuously optimize for performance, scalability, observability, and reliability across mobile applications serving millions of users.

REQUIRED SKILLS AND QUALIFICATIONS

• 7+ years in either Android (Kotlin) or iOS (Swift/Objective-C) is required, with an ability to collaborate across platforms
• 3+ years of exposure to CI/CD pipelines for mobile (e.g., Bitrise, GitHub Actions, Jenkins, Fastlane)
• 3+ years experience with designing and building APIs for Mobile consumption
• Experience owning or contributing to mobile frameworks, SDKs, or libraries used across multiple apps or teams
• Familiarity with release automation, versioning, and app store deployment (TestFlight, Google Play Console)
• Experience with unit, integration, and UI testing for mobile apps
• Experience in managing frameworks/systems e.g. Bitrise, Firebase

PREFERRED QUALIFICATIONS AND SKILLS

• Experience with React Native, Flutter, or cross-platform frameworks
• Experience with feature flags, A/B testing, or experimentation platforms
• Familiarity with backend technologies (Java 17+, Spring Boot, SQL)
• Familiarity with monitoring and analytics tools (e.g., Firebase, Datadog)