Senior Fullstack Mobile Product Engineer

Plasma is a purpose-built blockchain for stablecoin payments. Engineered from the ground up to address the unique needs of stablecoins, Plasma provides a scalable, efficient, and secure foundation for the next generation of money movement. We believe stablecoins can transform global finance and improve financial access worldwide. To reach the next level of adoption, dedicated and purpose-built infrastructure is required.

We are looking for a Senior Fullstack Mobile Product Engineer to join our founding product team and build consumer-facing mobile applications that make stablecoin transfers feel seamless and familiar. This role is primarily focused on mobile and frontend development, with secondary responsibilities in backend services and blockchain integration as needed. You will contribute across the stack to deliver polished, user-friendly features, with a focus on product engineering rather than protocol development.

• Design and develop mobile applications using React Native and Expo, with a focus on performance, responsiveness, and motion design

• Build responsive web applications and reusable UI components for stablecoin wallets, transaction flows, and financial interactions

• Ensure consistency and quality across iOS and Android platforms through testing, polish, and design collaboration

• Develop and maintain mobile-first design systems in close partnership with product and design teams

• Integrate mobile apps with backend services and blockchain infrastructure to enable secure wallet functionality and real-time updates

• Build APIs for mobile clients and implement transaction signing, balance updates, and error recovery logic

• Drive product quality through testing strategies, continuous delivery practices, and attention to UX detail

• 5+ years of experience in fullstack and mobile development, with deep expertise in React Native and modern JavaScript frameworks

• Proficient in TypeScript, with strong experience using Expo and deploying mobile apps to iOS and Android platforms

• Skilled in state management tools such as Redux, MobX, or Zustand, with a focus on clean architecture and scalability

• Strong eye for design, with a track record of delivering polished, intuitive mobile user experiences

• Comfortable working across the stack, with backend experience in Node.js and API integration (REST and GraphQL)

• Experience building real-time features using WebSocket or similar technologies

• Experience with mobile wallet security, such as biometric authentication, and secure key storage

• Understanding of mobile-specific blockchain challenges, such as WalletConnect integration and deep linking

• Experience optimizing React Native apps for performance

• A high degree of ownership and product intuition, with a focus on quality, performance, and reliability

• Experience with stablecoin protocols (USDC, USDT, DAI)

• Previous fintech or payments experience

• Mobile: React Native, Expo, TypeScript, Reanimated

• Frontend: React, Next.js, TypeScript, TailwindCSS

• State Management: Zustand, TanStack Query

• Backend: Node.js, TypeScript, PostgreSQL, Redis

• Blockchain: Ethers.js, WalletConnect, Web3 providers

• Infrastructure: Vercel, Docker, Kubernetes, AWS/GCP

• Tools: GitHub, CI/CD pipelines, Sentry, Analytics

Benefits for full-time employees include an above-market salary, a generous ownership package, comprehensive insurance coverage, and generous paid time off.