Frontend Engineer, Phantom

• 7+ Years of Frontend Experience
• Building production React applications (web and/or React Native) in high-velocity environments (fintech, consumer apps, SaaS)
• Proven track record shipping A/B-tested, feature-flagged interfaces and rapidly iterating based on metrics
• Advanced React and React Native proficiency, including hooks, context, and performance optimization techniques
• Hands-on experience with feature-flag platforms or custom A/B frameworks
• Strong background in TypeScript, component-driven development, and design-system architecture
• Expertise in front-end performance tuning: code-splitting, lazy loading, memoization, and build-time optimizations
• Instrumentation and observability skills: integrating with Segment, Mixpanel, Amplitude, or similar for real-time analytics
• Proficiency with testing frameworks (Jest, Cypress, React Testing Library) and CI/CD pipelines for front-end delivery
• Data-driven mindset: formulates clear UI hypotheses, measures impact, and iterates quickly
• Excellent communicator and collaborator: thrives in cross-functional teams and handles shifting priorities with grace
• Strong ownership and bias for action: comfortable shipping code, monitoring its impact, and refining based on data
• Mentorship orientation: eager to coach IC3-level peers through design reviews and pair-programming

Desirable

• As a key member of our Growth & Engagement squad, you will own the design, implementation, and optimization of user-facing growth features action cards, referral flows, push-notification experiences, Phantom Pro upsells, and onboarding enhancements
• You’ll partner with Product, Design, and Backend to turn hypotheses into polished, performant, and A/B-test-ready interfaces, build reusable component libraries, and instrument every feature for real-time analytics and rapid iteration
• Feature Development: Ship 2+ end-to-end growth UI features per quarter, each with comprehensive E2E tests, documentation, and performance budgets
• Experimentation Enablement: Integrate feature-flags and build rollout controls so PMs can launch, measure, and rollback UI experiments without developer intervention
• Component Library & Design System: Create and maintain reusable, theme-able React (and React Native) components that power all growth experiments and ensure visual consistency
• Instrumentation & Analytics: Emit structured events (clicks, impressions, variant cohorts) for every feature; collaborate with Data to validate pipelines and dashboards
• Performance & Reliability: Optimize first-paint times (<100 ms) and maintain ≤1 % production error rates; participate in front-end on-call rotation and triage issues within 15 minutes
• Cross-Functional Collaboration: Work closely with Backend, Product, Design, and Data teams to unblock dependencies, align on API contracts, and champion a data-driven development process
• Mentorship & Best Practices: Lead code reviews, pair-programming sessions, and knowledge-sharing Dojos to elevate front-end excellence across the team