Kotlin Developer — AI Training (Remote, Long-Term)

About OpenTrain

OpenTrain is the #1 platform for finding and building careers in AI training and data labeling. We connect people with projects that teach AI systems how to behave, helping contributors start and grow careers in a fast-growing, remote-friendly industry.

About AI training work

AI training (data labeling / annotation) is the human side of building modern AI: people prepare examples, correct outputs, and evaluate model behavior so systems learn reliably. This field is highly accessible, often remote and flexible, and lets contributors directly shape how cutting-edge models respond.

• Work remotely from anywhere with a computer and internet.
• Flexible, part-time schedules that can fit around other commitments.
• No prior AI experience required for many projects, although specialist skills pay more.

The role

We’re seeking skilled Kotlin developers to produce high-quality code samples, short programs, and debugging fixes used to train and evaluate AI code models. This is a long-term engagement (6+ months) with a weekly commitment of 20–40 hours and fully remote work.

• Create Kotlin code snippets and short programs from detailed prompts.
• Debug and refine Kotlin code generated by AI to meet defined standards.
• Develop accurate, well-documented training data that helps models learn correct patterns.

What you’ll do

Your day-to-day will focus on producing high-quality Kotlin examples, troubleshooting AI outputs, and improving dataset quality so models produce safer, more correct code.

• Write concise Kotlin functions and short programs that follow given prompts and constraints.
• Identify, fix, and explain bugs in AI-generated Kotlin code.
• Optimize and refactor code for clarity, correctness, and robustness.
• Annotate examples and metadata so training datasets are machine-usable and reproducible.
• Flag ambiguous prompts, edge cases, and gaps in dataset coverage for reviewers.

Requirements

Candidates must meet the listed academic, technical, and logistical requirements to be considered for this project.

• Bachelor’s or Master’s degree in Computer Science, Engineering, or a related field.
• At least 2 years of professional experience in software development with a strong focus on Kotlin.
• (If you have less than 2 years of Kotlin experience, you should receive less than a 7 score on your proposal qualification score.)
• Proven ability to develop, troubleshoot, and optimize Kotlin code.
• Effective communication skills in English and ability to collaborate in a remote team.
• Stable internet connection and reliable electricity to ensure consistent remote work.
• Availability to commit 20–40 hours per week for at least 6 months.

Compensation & engagement details

This role is a contractor, part-time position paid hourly. Work hours are flexible and can be set by you within the weekly commitment window.

• Rate: USD $9.50 per hour.
• Employment type: Contractor, Part-time.
• Duration: Long-term engagement (6+ months).
• Weekly commitment: 20–40 hours, remote and worldwide.

How the application works

To apply, submit your proposal through the OpenTrain platform. After your submission you will receive a Kotlin coding assessment to complete; passing that assessment is required to move forward.

OpenTrain helps you get started and grow in AI training work, connecting you to projects where your developer skills directly improve how models write and reason about code.

• Submit proposal → receive Kotlin coding assessment → complete assessment → onboarding if selected.
• You’ll work remotely, set your own hours within the 20–40 hr/week expectation, and invoice as a contractor.