Mobile Developer iOS

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

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