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Frontend Engineer - Mobile Experience

Location

United States + 6 moreAll locations: United States | United Kingdom | India | Portugal | Poland | United Arab Emirates | China

Posted

106 days ago

Salary

0

Seniority

Mid Level

Job Description

Frontend Engineer - Mobile Experience

FitNext Co.

This description is a summary of our understanding of the job description. Click on 'Apply' button to find out more. Role Description We are seeking a very senior Frontend Engineer (with strong full-stack skills) to build and scale world-class mobile financial applications. You’ll be working at the intersection of fintech, blockchain, and AI - delivering flawless UI/UX, crafting secure APIs, and accelerating development using cutting-edge AI tools. This role is ideal for someone who thrives in fast-moving, high-ownership environments. Key Responsibilities - Develop production-grade, pixel-perfect UIs in React Native + Expo, using Tamagui + Style Dictionary for design consistency. - Own critical features including: wallets, payments, onboarding, notifications, and transaction histories. - Build and maintain scalable serverless APIs (Lambda, API Gateway, DynamoDB, Kinesis, EventBridge). - Integrate stablecoin / blockchain payment flows with regulatory-grade security. - Implement real-time experiences with WebSockets and SSE, including AI-driven chat and streaming UX. - Optimize performance (Hermes, Reanimated, FlashList) and ensure high observability (Sentry, Better Stack). - Collaborate closely with design using Figma → Tokens → Tamagui workflows. - Actively leverage AI development tools (Claude, Cursor, MCP integrations) to accelerate delivery. - Contribute to AI-assisted engineering best practices and mentor other engineers. Qualifications - 10+ years of professional engineering experience, with 5+ years building mobile fintech apps. - Proven track record delivering complex, secure financial products with high-quality UX/UI. - Expert-level proficiency in React Native + Expo. - Solid full-stack background with TypeScript and serverless AWS architecture. - Strong understanding of secure authentication (Cognito, JWT, device secrets) and data protection. - Experience with stablecoins, blockchain transactions, or payment API integrations. - Strong knowledge of real-time networking (WebSockets, SSE). - Comfortable using AI tools in day-to-day development. - Passion for innovation and setting new standards in AI-driven software engineering. Benefits - Build a world-class, AI-powered fintech platform. - Work in a modern, unified TypeScript stack. - Shape the future of AI-driven engineering. - Tackle complex problems in fintech UX, payments, real-time systems, and blockchain. - Join a senior, remote-first team that values ownership, quality, and innovation. Interview Process - (No live coding) - Introductory conversation with CTO and Head of Engineering - Technical interview and take-home assessment (45–60 min)

Job Requirements

  • 10+ years of professional engineering experience, with 5+ years building mobile fintech apps.
  • Proven track record delivering complex, secure financial products with high-quality UX/UI.
  • Expert-level proficiency in React Native + Expo.
  • Solid full-stack background with TypeScript and serverless AWS architecture.
  • Strong understanding of secure authentication (Cognito, JWT, device secrets) and data protection.
  • Experience with stablecoins, blockchain transactions, or payment API integrations.
  • Strong knowledge of real-time networking (WebSockets, SSE).
  • Comfortable using AI tools in day-to-day development.
  • Passion for innovation and setting new standards in AI-driven software engineering.

Benefits

  • Build a world-class, AI-powered fintech platform.
  • Work in a modern, unified TypeScript stack.
  • Shape the future of AI-driven engineering.
  • Tackle complex problems in fintech UX, payments, real-time systems, and blockchain.
  • Join a senior, remote-first team that values ownership, quality, and innovation.
  • Interview Process
  • (No live coding)
  • Introductory conversation with CTO and Head of Engineering
  • Technical interview and take-home assessment (45–60 min)

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