micro1 is seeking a Senior Mobile Software Engineer for a remote contract role (~15 hours per week) to create Reinforcement Learning Environments that evaluate frontier AI models on complex mobile software engineering challenges. Candidates must possess hands-on expertise in cross-platform (React Native/Flutter), iOS (Swift), or Android (Kotlin) development, along with strong debugging and architectural skills. Responsibilities include defining challenging mobile coding problems, building reproducible environments, writing deterministic verifiers, and providing golden reference solutions.