Freelance Senior Software Developer (Kotlin) - AI Trainer

Please submit your CV in English and indicate your level of English proficiency.

Mindrift connects specialists with project-based AI opportunities for leading tech companies, focused on testing, evaluating, and improving AI systems. Participation is project-based, not permanent employment.

What this opportunity involves

While each project involves unique tasks, contributors may:

• Design and maintain automated tests to ensure the quality, performance, and reliability of Kotlin and Android applications.
• Collaborate with developers to identify, reproduce, and resolve functional, performance, and UI issues across multiple environments.
• Define and improve quality standards across build pipelines, ensuring smooth CI/CD integrations and release stability.
• Monitor app behavior in production and use data‑driven insights to guide testing priorities and improvements.
• Apply professional judgment to assess AI responses.

What we look for

This opportunity is a good fit for Senior Kotlin software developers open to part-time, non-permanent projects. Ideally, contributors will have: 

• Degree in Computer Science, Software Engineering or related fields.
• 5+ years of Kotlin including coroutines, extension functions, and sealed classes.
• 3+ years of Android/JVM development experience.
• Familiarity with JUnit  5, Kotest, MockK, and Android testing (Espresso, Robolectric).
• English proficiency - B2
• Stable internet connection 

How it works

Apply → Pass qualification(s) → Join a project → Complete tasks → Get paid

Project time expectations

Tasks for this project are estimated to take 6-10 hours to complete, depending on complexity. This is an estimate and not a schedule requirement; you choose when and how to work. Tasks must be submitted by the deadline and meet the listed acceptance criteria to be accepted.

Payment

• Paid contributions, with rates up to $50/hour*
• Fixed project rate or individual rates, depending on the project
• Some projects include incentive payments

*Note: Rates vary based on expertise, skills assessment, location, project needs, and other factors. Higher rates may be offered to highly specialized experts. Lower rates may apply during onboarding or non-core project phases. Payment details are shared per project.