Lead iOS Engineer
Backend Mobile App Development Mobile App Testing iOS Development IOS
Salary
Location
Benefits
Laptop/desktop for works
Other benefits
Flexible working time
Work-from-home
Job Overview And Responsibility
We are looking for a skilled and detail-oriented Lead iOS Engineer to develop the native iOS application for Felix AI. This role requires deep experience in Swift and SwiftUI, with strong expertise in real-time audio input/output, WebSocket integration, and mobile performance optimization. Key Responsibilities ● Lead the end-to-end development of the native iOS app using Swift and SwiftUI following MVVM or TCA architectural patterns. ● Implement real-time audio capture and playback (PCM) using AVAudioEngine, with robust handling of audio interruptions. ● Build and maintain WebSocket client (URLSessionWebSocketTask) for bi-directional, low-latency communication with the backend. ● Integrate REST APIs, Firebase Authentication, and implement offline data caching (Core Data or Realm). ● Optimize app performance (CPU, memory, battery, startup time, UI framerate) using Instruments. ● Achieve and maintain accessibility compliance (WCAG 2.1 AA) with support for VoiceOver, Dynamic Type, etc. ● Write and maintain unit and UI tests (XCTest), target >80% code coverage. ● Own the App Store release process and dependency management via Swift Package Manager (SPM). ● Collaborate closely with backend and DevOps engineers, PM, and UI/UX designer. Key Performance Indicators (KPIs) ● App startup < 2 seconds; sustained 60fps UI ● 80% test coverage; crash-free rate > 99.5% ● Stable real-time audio/WebSocket functionality verified under real-world conditions ● App Store delivery within 3 months of onboarding ● Accessibility compliance (WCAG 2.1 AA) validated through testing
Required Skills and Experience
● 7–10+ years in native iOS development with a strong portfolio of performant apps. ● Expert in Swift and SwiftUI; advanced knowledge of AVFoundation and WebSockets. ● Proven experience handling real-time audio streams, API integration, and optimizing for battery/network. ● Experience implementing offline caching strategies and accessibility compliance.
Why Candidate should apply this position
- Work arrangement: Hybrid (office 1-2 days/week) - Full-time labour contract
Preferred skills and experiences
● EdTech product experience ● Apple Developer or Swift certification
Report to
Client
Interview process
Technical interview and English check -> Client review, assignment (3hrs) -> Interview with client side
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