Senior Software Engineer, Mobile Platform

Hybrid, Bucharest, Romania

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)

ABOUT LEGION

Join Legion's mission to turn hourly jobs into good jobs. We're a mission-driven team seeking exceptional talent to propel this vision. Embrace a culture that's collaborative, fast-paced, and entrepreneurial. With us, you'll grow your skills, work closely with experienced executives, and contribute significantly to our mission. Our award-winning AI-native workforce management platform is intelligent, automated, and employee-centric and proven to deliver 13x ROI. We help labor-intensive organizations maximize labor efficiency and employee engagement simultaneously. Legion has earned recognition for its innovation, including spots on the Inc. 5000 list, Forbes’ Next Billion Dollar Startups, and awards for our AI technology. Backed by leading investors such as Norwest Venture Partners, Stripes, First Round Capital, XYZ Ventures, Webb Investment Network, Workday Ventures, and NTT DOCOMO Ventures, we're making real change. If you're ready to make an impact and grow your career, Legion is where you belong. Join us in making hourly work rewarding and fulfilling.

BACKGROUND AND OPPORTUNITY

There are almost 75 million hourly workers in the United States, representing more than half of the entire workforce. Historically, managing hourly employees has been difficult due to high attrition (average of 60%) and high replacement costs (average of $3,200 per employee in retail). The ongoing labor shortage and competition from the gig economy, make it more difficult to attract and retain hourly employees. The top reasons hourly employees leave their jobs are a lack of schedule empowerment, poor communication with employers, and an inability to get pa