Senior Mobile Cross Platform Engineer
Designer Fund is a venture fund and design partner that invests in early-stage technology companies where design is central to value creation. It supports founders with product and brand design, hiring, fundraising, and access to a design-focused community.
Maintainer signals as of 8/14/2026
About Designer Fund
Designer Fund invests in early-stage startups from pre-seed through Series A that use design to improve health, sustainability, and prosperity. The fund provides capital, design strategy, product and brand guidance, design hiring support, fundraising assistance, investor introductions, and access to the Designer Fund Collective of founders, advisors, and design leaders. Its portfolio includes technology companies serving sectors such as financial infrastructure, healthcare, developer tools, collaboration, climate technology, and productivity.
Skills
Candidate Availability
Required and preferred rules are kept separate and reflect the wording in the original posting.
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
