Senior Mobile Cross Platform Engineer
Designer Fund is a venture capital firm that invests in early-stage tech companies using design to improve health, sustainability, or prosperity for people. It backs founding teams, particularly those with design backgrounds, across sectors like fintech, healthcare, climate tech, and developer tools.
About Designer Fund
Designer Fund is an early-stage venture capital firm that invests in tech companies leveraging design to drive positive outcomes in health, sustainability, and financial prosperity. Its portfolio spans a wide range of sectors including financial infrastructure (Stripe), preventative health (Omada), collaborative tools (Notion), developer tools (Netlify), product management (Linear), payroll and benefits (Gusto), design tools (Framer), and healthcare infrastructure (Commure), among dozens of other companies across fintech, climate tech, healthcare, EdTech, and AI. The firm also runs 'Designer Founders,' a community and platform highlighting designers who have gone on to found and lead companies, reflecting its focus on backing design-driven founders and design-centric startups from early stages through growth and acquisition.
Skills
About the Role
You'll be a core member of the rider mobile team, owning the mobile experience that millions of riders depend on every day - from booking rides and managing accounts to the underlying mobile infrastructure that makes it all work seamlessly. You'll work across both native Android and iOS and the cross-platform Flutter codebase, collaborating closely with designers, backend engineers, and product managers who care deeply about the quality of what they ship. If you're a mobile engineer who takes pride in building polished, high-performance experiences across platforms and wants to see your work used at real scale, this is the role for you. This is a hybrid position with the expectation that you will be onsite in NYC 2-3 days a week.
Requirements
- 5+ years of mobile development experience, with strong hands-on experience in cross-platform frameworks - Flutter experience is a strong advantage - alongside solid native development experience in Android (Kotlin) or iOS (Swift)
- Comfortable working across both cross-platform and native codebases, with a good instinct for when each approach is the right tool for the job
- Strong grasp of mobile app architecture patterns, performance optimization, and concurrent programming - whether that's Kotlin Coroutines, Swift's async-await, or Dart's async patterns in Flutter
- Experienced with mobile frameworks including Location Services and Google Maps API, and familiar with third-party mapping tools such as Mapbox
- A natural collaborator and mentor
- Proactive and genuinely curious about new technologies
Responsibilities
- Collaborate closely with designers, backend engineers, and product managers in order to deliver a high-quality, user-friendly rider application
- Own the development and continuous improvement of Via's rider mobile apps across platforms - building new features across booking, account management, and the core rider journey while keeping the experience fast, reliable, and intuitive
- Work primarily in Flutter for cross-platform development while contributing to native Android and iOS codebases where needed, making pragmatic decisions about when to go cross-platform and when to go native
- Architect and evolve the mobile infrastructure services that power Via's apps, making thoughtful decisions about app architecture patterns, performance optimization, and memory management
- Diagnose and resolve critical production issues under pressure, minimising disruption to riders and acting as a key line of defence when things go wrong in live environments
- Mentor and guide engineers on the team - sharing expertise across platforms, reviewing code thoughtfully, and helping others grow
Benefits
- Free medical plans
- 401K matching
- Catered lunch on Wednesdays