iOS Engineer (Swift and Objective-C)

About the role

We are looking for an experienced iOS Engineer to work remotely on an hourly‑paid contract. You will review AI‑generated iOS code, evaluate mobile architectures, and create high‑quality reference implementations and step‑by‑step explanations for complex engineering problems.

Key responsibilities

• Develop AI training content by writing detailed prompts and reference answers on iOS topics.
• Review and assess AI‑generated Swift/Objective‑C code for correctness, security, performance, and best practices.
• Produce reference implementations, fact‑check technical information, and write clear explanations.
• Rate and compare multiple AI responses, providing feedback to improve model accuracy.
• Identify issues in UIKit/SwiftUI, concurrency, memory management, networking, persistence, and build/release processes.

Required profile

• Bachelor’s degree in Computer Science, Software Engineering or equivalent practical experience.
• 4+ years of professional experience building production iOS applications.
• Strong knowledge of iOS fundamentals, app lifecycle, and background execution.
• Solid experience with concurrency (GCD, OperationQueue, async/await) and ARC memory management.
• Experience with networking, data persistence, testing, CI/CD, and App Store release hygiene.

Required skills

• Swift (Swift 5+)
• Objective‑C
• UIKit & SwiftUI
• Grand Central Dispatch, OperationQueue, async/await
• ARC, Instruments, memory‑leak detection
• URLSession, JSON parsing, caching strategies
• Core Data, SQLite, Realm
• XCTest, UI testing, mocking frameworks
• Fastlane (plus), CI/CD pipelines
• Keychain, transport security, authentication flows

What we offer

• Fully remote work environment.
• Hourly‑based freelance contract with a fast‑growing AI data services company.
• Opportunity to influence AI model quality used by millions of developers.