Senior Mobile Developer

Cashback24x7; India; Remote; INR 2,275,000 - 4,095,000; Part time

Job summary

Cashback24x7 is seeking a Senior Mobile Software Engineer (Contractor) to craft challenging mobile coding tasks for frontier AI models. You will design, implement, and verify reproducible environments across iOS and Android platforms, contributing to high-quality real-world data used to train models.

The role emphasizes deep expertise in mobile architectures, lifecycle management, and performance optimization, with a remote, part-time engagement (~15 hours/week).

Qualifications

• Significant hands-on expertise in mobile development tracks such as cross-platform, iOS, or Android.
• Ability to design and implement mobile tasks for AI training environments.
• Strong debugging skills and focus on performance improvements.

Responsibilities

• Create realistic mobile coding tasks for frontier AI models.
• Define problems and reproducible environments.
• Write deterministic verifiers for multiple valid solutions.
• Provide reference solutions for the tasks.

Skills

Cross-platform

React Native

Flutter

SwiftUI

Kotlin

Jetpack Compose

Debugging

Job description

Job DescriptionRole Title: Senior Mobile Software EngineerRole Type: Contractor (~15 hrs a week)Location: RemoteIn 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 48 hours and are looking for experts ready to jump in right away. If selected, we expect you to start your first tasks within 24–48 hours of completing onboarding.