Lead iOS Engineer
Backend Mobile App Development Mobile App Testing iOS Development IOS
Benefit
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
About InApps
Continuously, InApps Technology is ranking 1st in Vietnam and 5th in Southeast Asia for Application Development on Clutch by getting great ratings and reviews from our clients. We not only satisfy clients with WOW experiences but also help them achieve memorable success milestones. With projects that we have excellently completed, our clients successfully raise capital as well as save up to 65% of the costs, and enhance efficiency up to 200%. With the mission "Realize your ideas", we have a secret formula to turn even the most complex ideas into quality products approaching from 100,000 to millions of users. We always commit 100% to 5-star service, meet the deadline, and bring more value than customers expect. Contact us now to make things happen!
Job Q&A
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This is a Lead iOS Engineer role requiring 7–10+ years of experience in native iOS development, along with a strong portfolio of high-performance apps. However, the offered gross salary of up to USD 1,600 appears below market standards. I recommend the company reassess the current salary range based on the recruitment market to ensure a more competitive candidate.
Hi Huong, the salary range noted in this JD is a NET range. For now, InApps would like to hire within the budget