Mobile App Developer - Remote

YO HR Consultancy; United States; Remote; GBP 83,000 - 138,000; Part time

Benefits offered by this job

Remote work

Flexible hours

Job summary

YO HR Consultancy seeks a Senior Mobile Software Engineer on a contractor basis (about 15 hours per week) working remotely. The role focuses on creating Reinforcement Learning Environments to test AI models’ mobile engineering problem-solving abilities, including fixing code, adding features, and optimizing performance.

You will define tasks across cross‑platform stacks (TypeScript/JavaScript/Dart; iOS Swift; Android Kotlin), implement reproducible environments, and provide a reference solution

Qualifications

• Extensive mobile development experience across iOS/Android or cross‑platform stacks.
• Experience designing tasks for frontier AI models and RL environments.
• Strong debugging and performance optimization skills.

Responsibilities

• Create realistic mobile coding tasks for frontier AI models.
• Design problems requiring strong mobile engineering and lifecycle handling.
• Develop reproducible environments and deterministic verifiers.
• Provide a reference solution showing task solving.

Skills

Mobile development

JavaScript

TypeScript

Dart

iOS

Android

React Native

Flutter

Tools

Git

Job description

Role Title: Senior Mobile Software Engineer

Role Type: Contractor (~15 hrs a week)

Location: Remote

In this role, you'll apply your expertise to help train next-generation AI systems. Your work will shape how models learn, reason, and perform through high-quality, real-world input.

As an expert, you will create Reinforcement Learning Environments that test an AI model’s ability to solve complex mobile software engineering problems related to fixing code, creating features, refactoring code, and optimizing performance. You will be tasked with creating a reproducible environment and a golden reference solution for each problem.

Scope of Work

• Create realistic, interesting, and extremely challenging mobile coding tasks for frontier AI models using your preferred repositories.
• Design problems that require strong mobile engineering skills, such as tracking down subtle bugs, building non-trivial features, handling application state and lifecycle, or improving performance.
• Develop tasks relevant to your expertise: cross-platform applications using TypeScript, JavaScript, or Dart; iOS applications using Swift; or Android applications using Kotlin.
• For each task, define the problem, build a reproducible environment, and write deterministic verifiers that accept correct solutions across different valid implementations while rejecting incorrect, incomplete, or hard-coded approaches.
• Provide a reference solution showing how the task can be solved.

Preferred Qualifications

• Significant hands‑on expertise in at least one of the following mobile development tracks:
• Cross-platform:TypeScript or JavaScript with React Native, or Dart with Flutter.
• iOS:Swift with SwiftUI or UIKit.
• Android:Kotlin with Jetpack Compose or the Android View system.
• Deep understanding of mobile application architecture, state management, asynchronous programming, and application lifecycle.
• Proven ability to debug complex mobile applications, resolve bugs, and deliver effective performance improvements.

Compensation Structure

Compensation is output-based; experts are paid per task that meets the project specifications. The time required to complete work may vary depending on the expert’s experience and workflow. Minimum weekly submission requirements apply and will be communicated during onboarding.

Start Timeline & Availability

• We typically fill roles within

Skills: javascript,mobile,ios,android,application