Senior Fullstack Mobile Engineer
Build and maintain React Native mobile apps for iOS and Android that process nonprofit donations via Tap to Donate and Giving Station, using TypeScript, Stripe Terminal, and a Node.js backend.
- Compensation
- €5.9K–€6.8K / mo
- Location
- Not listed
- Work setup
- Remote
- Seniority
- Senior
- Employment
- Not specified
- Experience
- 3+ years
- Category
- Fullstack
- Posted
Skills
Must have
- 8+ years of professional software development experience, including 3+ years with React Native.
- Proficiency in React Native and TypeScript — the primary craft.
- Strong JavaScript fundamentals — asynchronous programming, event loop behavior, error handling.
- Working knowledge of relational and document databases — data modeling, querying, indexing.
- Understanding of RESTful API design and HTTP fundamentals — able to work across Node.js backend services, API contracts, database queries, and web frontend code.
- Familiarity with the native iOS and Android platforms and their tooling (Xcode, Android Studio, Gradle).
- Understanding of mobile OS fundamentals — app lifecycle, background execution, permissions, and memory constraints.
- Experience with automated testing practices (unit, integration, E2E).
- Understanding of mobile security — secure storage and handling of sensitive and payment data.
- Confident day-to-day use of AI-assisted development tools — for research, troubleshooting, and implementation.
- Ability to independently diagnose common React Native production issues — rendering, navigation, networking, and app lifecycle.
- Track record of owning mobile initiatives end-to-end — from requirements through store release, including the backend and web frontend changes they require.
- Experience designing mobile application architecture — trade-offs in performance, reliability, and observability across iOS and Android.
- Experience designing or integrating native modules and SDKs where React Native abstractions are insufficient — including focused Swift/Kotlin changes and debugging across the JavaScript and native lay
Nice to have
- Broader backend and database experience.
- Experience with event-driven architectures and asynchronous messaging patterns.
- Experience operating high-traffic, low-latency systems.
- Experience with offline-first architectures and data synchronization over unreliable networks.
- Familiarity with React Native's New Architecture (JSI, Fabric, TurboModules, Codegen) and the native library compatibility constraints of migrating to it.
- Native development depth in Swift and/or Kotlin beyond React Native.
- Experience with in-person or mobile payments and fintech products.
- Experience with Stripe Terminal, Tap to Pay, or NFC.
- Experience in a distributed, remote-first engineering organization.
Full description
About the Mobile Team
You'll join the mobile team inside our Engineering department. The team builds the products that let nonprofits accept donations in the physical world. Tap to Donate lets a staff member or volunteer accept contactless payments directly on a smartphone. Giving Station is a self-service donation point: a donor selects an amount on a tablet and pays through a connected external payment terminal.
Our mobile stack:
- bare React Native (0.79, Old Architecture)
- React 19, TypeScript
- React Navigation 7, TanStack Query 5, React Context
- react-hook-form, Zod
- an internal UI Kit built with twrnc
- Stripe Terminal, Tap to Pay, external payment terminals
- Sentry, PostHog
- Node.js, NestJS, React, MongoDB, ClickHouse, and Redis across the backend and web stack
About the Role
You will design, build, and maintain the mobile applications that power Fundraise Up's product on iOS and Android. Mobile is the primary focus, with contributions extending to the backend and web frontend the product depends on to deliver features end-to-end. You'll work across the full development lifecycle — from requirements analysis through implementation, testing, store release, and production support — and ensure the applications are reliable, performant, and secure across the devices and OS versions in use.
What You'll Do
- Implement features, fix bugs, and resolve production incidents across iOS and Android, extending to the backend and web frontend the product depends on — delivering tested, production-ready output that meets the team's quality bar.
- Own mobile initiatives end-to-end — gather requirements, design the approach, decompose into tasks, implement, and deliver to production across iOS and Android, including the backend and web frontend changes they require.
- Act as the team's primary technical escalation point for complex mobile problems — diagnose root causes across the app, native layers, networking, and platform behavior, and prevent recurrence.
- Review code and designs for correctness — component and navigation structure, rendering, native integration, and alignment with mobile patterns — catching issues before release.
- Contribute to and evolve mobile engineering standards within the team — component architecture, native integration, testing, and release policy.
- Monitor the operational health of shipped work — track releases and staged rollouts, watch release health, and respond to post-release issues on both platforms.