Engineering Manager - Mobile (Flutter/React Native/AI)

Location: VietnamDepartment: Product, Engineering & Data ScienceReport to: Senior Director of EngineeringAbout UsELSA is a global leader in AI-powered English communication training, dedicated to transforming how people learn and speak English with confidence. Founded in 2016 and headquartered in San Francisco, we operate across the U.S., Vietnam, Portugal, Indonesia, Brazil and Japan.Powered by proprietary speech-recognition technology and generative AI, ELSA delivers real-time, hyper-personalized feedback to help learners improve pronunciation, fluency, and overall communication effectiveness. With over 50 million learners and 1 billion hours of anonymized speech data, ELSAs depth of language training intelligence is unmatched in the industry.Our B2B flagship platforms ELSA Enterprise and ELSA Schools empower organizations and educational institutions to elevate communication capabilities and unlock personal and professional opportunities for their people. We design engaging, bite-sized learning experiences that adapt to each learner's goals and context, ensuring measurable improvement and lasting confidence.Our vision is to become the global standard for real-time English communication training, enabling 1.5 billion language learners worldwide to speak clearly, be understood, and share their stories with the world.Backed by world-class investors including Googles Gradient Ventures, Monks Hill Ventures, and SOSV, ELSA has been recognized among the top global AI innovators:Forbes Top 4 Companies Using AI to Transform the WorldResearch Sniper Top 5 Best AI AppsASU+GSV EdTech 150CB Insights Top 100 AI CompaniesJoin us in shaping the future of language learning and empowering millions to unlock opportunity through confident communication.Role SummaryWe operate a Flutter-based ecosystem with 50 million users. At this scale, "small bugs" become "global outages" and "minor lag" becomes "million-dollar churn." We are looking for an EM who is as comfortable discussing Flutter's Layered Architecture as they are discussing AI token optimization and growth flywheels. You will lead the team that builds the core engine of our user experience.Key ResponsibilitiesArchitect for Millions: Lead the transition from "shipping features" to "shipping systems." Ensure our Flutter frontend and Python backend can handle massive, bursty global traffic without degrading.Bridge the AI Gap: Work with ML engineers to integrate AI into the mobile UX. This means solving for "streaming" UI, handling model hallucinations gracefully, and keeping the app "snappy" even when the AI is thinking.Own the Experimentation Stack: You won't just "do A/B testing"—you will own the infrastructure that allows us to run 20+ experiments simultaneously across different regions without breaking the build.Technical Debt Strategist: At 50M users, you can't rewrite everything. You need to make hard calls on where to patch, where to refactor, and where to ignore tech debt in favor of market speed.Performance as a Feature: You will treat "Time to Interactive" (TTI) and "App Load Time" as Tier-1 product requirements, equivalent to any new feature.