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iOS Engineer (Swift and Objective-C)

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Job details

Pay

$40–$110 USD/hr

Engagement

Contract, part-time

Location

Remote

6 countries

Posted

Jul 9, 2026

OpenTrain on Trustpilot

The work

You will evaluate AI-generated iOS code and technical explanations, then help improve future model responses. Your reviews will cover real-world engineering concerns across UIKit, SwiftUI, concurrency, memory, networking, persistence, testing, and app releases.

  • Review AI-generated iOS code and explanations for correctness, clarity, security, performance, reliability, and prompt adherence.
  • Find problems involving UIKit, SwiftUI, app lifecycle, navigation, state management, background execution, threading, and networking.
  • Write detailed prompts and strong reference answers across iOS development topics.
  • Compare multiple AI responses and rate the best solution using clear engineering judgment.
  • Fact-check technical information and flag unsafe recommendations.
  • Assess offline-first patterns, caching, persistence, debugging, testing, CI/CD, Fastlane, and App Store release practices.

Requirements

This is an intermediate, part-time contractor role focused on iOS code review and AI output evaluation. You should be comfortable making detailed technical judgments and explaining them clearly in English.

  • Time: 20+ hours per week.
  • Language: Professional fluency in English.
  • Experience: Production iOS application experience with Swift and ideally Objective-C.
  • Skills: Strong Swift knowledge, including generics, protocols, error handling, and modern language features.
  • Knowledge: GCD, OperationQueue, async/await, race conditions, thread safety, ARC, retain cycles, memory leaks, networking, testing, Keychain, and privacy-sensitive data handling.
  • Experience: Intermediate level

Open to applicants in

  • Germany
  • India
  • Thailand
  • Timor-Leste
  • United States
  • Vietnam

Preferred

  • Helpful experience: XCTest, UI testing, CI/CD, Fastlane, App Store release hygiene, offline-first design, caching, persistence, and production debugging.
  • Previous AI training, annotation, or AI output evaluation experience is a plus.

How to apply

  1. Press Apply now. You create a free account and add your resume.
  2. Complete your application for this role on OpenTrain.

Job ID: cmrd9a9pv00046j3lj3htv2rj

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