Mobile Developer (iOS)
Job Description:
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
Requirements:
5+ years of iOS development, including at least 2 years carrying senior-level technical responsibility
Deep Swift; comfortable in both UIKit and SwiftUI, with a view on when each belongs
Modern concurrency: async/await, Structured Concurrency, GCD; Combine or equivalent
Architecture at scale: MVVM / VIPER / TCA, modularization, dependency injection — and the reasoning behind the choice
Networking: URLSession, WebSockets, caching, graceful behaviour on poor connections
Testing: unit, snapshot, and UI tests, with a clear point of view on what is worth testing
Performance and memory profiling with Instruments
iOS CI/CD: Fastlane, Xcode Cloud, Bitrise, or GitHub Actions
Able to explain technical decisions to non-technical stakeholders — in this industry you will do it often