- Own the architecture, quality, and performance of the iOS app end to end
- Build and maintain core flows: order entry, portfolio, watchlist, transaction history, onboarding
- Handle real-time market data on the client — WebSocket lifecycle, reconnect strategy, snapshot + delta, conflation for slow connections, and keeping the UI smooth while thousands of instruments tick
- Protect order integrity client-side: client order IDs, deduplication, idempotency, and correct order state machine handling when the network drops mid-submit
- Financial-grade app security: certificate pinning, Keychain storage, biometric authentication, jailbreak detection, sensitive-screen protection
- Honest mobile observability: crash-free rate, hang rate, cold start, per-endpoint latency — and acting on the numbers
- Mature the iOS CI/CD pipeline: automated builds, signing, TestFlight, shortening commit-to-release time
- Release discipline: feature flags, staged rollout, genuinely tested rollback, and releasing outside exchange hours
- Review code, mentor engineers, and set the mobile team's engineering standards
- Work with compliance, risk, and security from the design stage rather than as a rubber stamp at the end
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