Freelance Senior Software Developer (Kotlin) - AI Trainer
Mindrift offers remote, project-based opportunities for senior Kotlin specialists to collaborate with leading tech companies in testing, evaluating, and improving AI systems. Core responsibilities include designing and maintaining automated tests for Kotlin and Android applications, collaborating with developers, ensuring quality in CI/CD pipelines, and using data to guide improvements. Compensation is up to $40/hour, with payments based on role and task complexity; some projects offer additional incentives.
Ideal candidates have a degree in Computer Science (or related discipline), at least 5+ years of Kotlin experience, 3+ years in Android/JVM development, and proficiency with JUnit 5, Kotest, MockK, Espresso, and Robolectric. English proficiency (B2 or higher) and a stable internet connection are required.
Projects have flexible, part-time hours (estimated 6-10 hours per task) and allow contributors to set their own schedules within task deadlines. Payment rates and project specifics are shared upon acceptance to each project.
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 $40/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.
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