Johnny McFadden, Portfolio

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MobileWebFintech

Staff Software Engineer, Native and Technical Lead

DailyPay, Inc. · Oct 2021 - Present

React NativeExpoTypeScriptSwiftKotlinObjective-CGitHub ActionsEAS
  • Lead Mobile Infrastructure and Services for a high-growth React Native platform
  • Architected UI patterns for consumer financial services and neo-bank debit card features
  • Deep linking, push notification architecture, and third-party SDK integration at scale: Branch.io, Iterable, Firebase, Pendo, Level Access
  • Internationalisation and translations across multiple locales
  • Error monitoring and crash reporting with Sentry and Firebase at scale
  • Authentication flows, access and refresh token lifecycle, and cryptography at scale
  • Driving React Native New Architecture migration (Fabric and TurboModules) and legacy Obj-C++ to Swift modernisation
  • Led zero-downtime Expo SDK (47-53+) and React Native upgrade cycles
  • Built a standalone native SDK for international remittance across Obj-C, TypeScript, Kotlin, and Swift for a Visa partnership
  • Cut internal build times by 70% via EAS Fingerprinting and Native Build Caching
  • Built CI/CD pipelines with GitHub Actions and EAS, one-click store releases and OTA updates
  • Founded Monthly Frontend Sync, cross-squad architecture alignment and FE standards forum
  • Lead frontend code and system design interviews
  • Developer relationship with the Expo team
WebE-commerce & Fraud

Senior Software Engineer

Signifyd · Jan 2021 - Oct 2021

ReactTypeScriptSCSSTerraform
  • React and TypeScript across a micro-frontend architecture: internal admin tooling, complex multi-step forms, and a billing platform, with Express and Fastify powering the micro-frontend infrastructure
  • Terraform infrastructure migrations and cloud resource management
  • Design system and shared component library work across multiple product teams
  • Full frontend accessibility audit across 5-10 apps, with a remediation plan and fixes shipped
WebE-commerce

Senior Software Engineer, Team Lead

Bazaarvoice · Mar 2019 - Jan 2021

ReactTypeScriptSCSS
  • Led the React Component Library (design system) used globally by internal application teams
  • Led the frontend user portal used by internal teams and external clients
Cyber SecurityWeb

Software Engineer

RepKnight · Jun 2017 - Mar 2019

ReactJavaScript
  • React and JavaScript web application development
  • Digital risk protection platform: dark web, deep web, and social media monitoring for data breaches and exposed credentials
  • Progressive web app development
Cyber SecurityWeb

Placement Software Engineer

RepKnight · Jun 2015 - Sep 2016

PHPJavaScript
  • Queen's University Belfast placement, frontend web development
  • Early-stage dark web and social media monitoring tooling
  • Progressive web app development