iOS Engineer (Swift and Objective-C)

About the Role

As an iOS Engineer (Swift / Objective-C), you will work remotely on an hourly paid contractor basis to review AI-generated iOS code, mobile architectures, and technical explanations; produce high-quality reference implementations and step-by-step reasoning for complex engineering problems; assess solutions for correctness, clarity, security, performance, reliability, and adherence to the prompt; identify issues in UIKit/SwiftUI implementation, concurrency, memory management, threading, app lifecycle, networking, persistence, and build/release practices; fact-check technical information; write high-quality explanations and model solutions that demonstrate best practices; and rate and compare multiple AI responses based on correctness and reasoning quality.

This fully remote, hourly paid contractor role is with SME Careers, a fast-growing AI data services company and subsidiary of SuperAnnotate that provides AI training data to many of the world’s largest AI companies and foundation model labs.

Key Responsibilities

• Create detailed prompts across iOS topics and write high-quality reference answers to guide AI learning.
• Review AI-generated iOS code, mobile architectures, and technical explanations and produce reference implementations and step-by-step reasoning.
• Evaluate and rank AI responses to improve correctness, security, performance, maintainability, and adherence to prompts.
• Identify and diagnose issues in UIKit/SwiftUI implementation, concurrency, memory management (ARC, retain cycles), threading, and app lifecycle.
• Assess networking, persistence, caching, offline strategies, and build/release practices for real-world iOS use cases.
• Fact-check technical information and test AI outputs for inaccuracies or unsafe recommendations.
• Compare multiple AI responses and rate them based on correctness and reasoning quality.

Qualifications

• Bachelor’s degree or higher in Computer Science, Software Engineering, or a closely related technical field (or equivalent practical experience).
• 4+ years of professional experience building production iOS applications, including work in Swift and (ideally) Objective-C codebases.
• Expert-level proficiency in Swift (Swift 5+): value/reference semantics, generics, protocols, error handling, and modern language features.
• Strong iOS fundamentals: app lifecycle, view/controller architecture, navigation, state management, and background execution constraints.
• Solid concurrency experience: GCD, OperationQueue, and modern async/await patterns; ability to reason about race conditions and thread-safety.
• Strong understanding of ARC and iOS memory patterns (retain cycles, weak/unowned, leaks) and use of Instruments.
• Experience with networking and data: URLSession, JSON parsing, caching, retries, offline strategies, and persistence (Core Data/SQLite/Realm).
• Experience with testing and quality: XCTest, UI testing, mocking strategies, CI/CD (Fastlane is a plus) and App Store release hygiene.
• Security awareness: secure storage (Keychain), transport security, auth flows, privacy permissions, and sensitive data handling.
• Minimum C1 English proficiency (written and spoken) with the ability to write clear technical explanations and follow detailed English-language guidelines.
• Previous experience with AI data training, annotation, or evaluating AI-generated technical content is a strong plus.
• Highly detail-oriented and systematic, able to evaluate reasoning quality and identify subtle issues in complex iOS code.

Additional Information

• Contractor role paid hourly and fully remote.
• There is no immediate project; qualified candidates will be among the first experts contacted when relevant opportunities arise.
• Membership in the expert network provides access to future projects with SME Careers / SuperAnnotate clients.