Staff App Engineer (Frontend)

Hiring quickly! Staff App Engineer, React Native focused, with an exciting AI stealth startup in the digital health space. This is a hybrid role based in Cambridge, MA: 3 days onsite, 2 days remote. Local Boston/Cambridge strongly preferred. We will consider candidates in NYC who can be onsite in Cambridge 3 days per week and/or open to relocation. No agencies please. We are unable to sponsor visas for this role.The must-haves:Strong React Native experience in a regulated environment. Healthcare, digital health, health tech, insurance, financial services, banking, government, or other highly regulated product environments are all relevant. HIPAA/PHI experience is especially valuable.This is not a generic frontend role. The right person has owned mobile architecture and can make strong technical decisions around state management, navigation, module boundaries, release infrastructure, observability, security, and long-term platform direction.What we need:8+ years of professional post-degree engineering experience.Deep React Native/mobile app experience.Experience building and scaling production mobile applications.Strong mobile architecture judgment.Experience with CI/CD, feature flags, staged rollouts, OTA strategy, crash/performance monitoring, App Store release workflows, or related mobile release infrastructure.Comfortable working around sensitive data, security, compliance, and regulated product constraints.Ability to partner across frontend, backend/API, product, and business stakeholders.Hands-on Staff-level IC, not a people-management role. This role is interviewing and hiring quickly!