About OpenTrain
OpenTrain is the #1 platform for finding and building careers in AI training and data labeling. The platform helps people discover projects, build a unified portfolio, and grow a durable freelance career doing the human work that teaches AI systems.
We connect skilled contributors with employers across the industry and make it easy to apply, track work, and develop a reputation in AI training — all from a single account.
About AI training and why it matters
AI training (also called data labeling or human feedback work) is the human side of building modern AI. People prepare examples, review outputs, and provide structured inputs that help models learn — everything from annotating images to curating programming examples.
This role sits at the intersection of software engineering and AI training: your frontend expertise will shape interfaces that collect, validate, and present the real-world signals that improve AI behavior.
The role
OpenTrain is recruiting a Senior Frontend Developer with deep JavaScript experience to contribute to AI training initiatives. This is a contractor, part-time position (20+ hours/week), fully remote and open worldwide.
You will focus on frontend architecture and high-quality user interfaces that support projects involving computer code/programming data and coding label workflows.
What you'll do
• Design, develop, and optimize robust frontend solutions using advanced JavaScript techniques.
• Translate business and product requirements into intuitive, responsive interfaces that support AI training tasks.
• Lead architectural decisions for frontend codebases and ensure scalable, maintainable designs.
• Mentor and coach junior developers; conduct code reviews and promote best practices.
• Implement modern frontend frameworks and state-management solutions (React, Vue, Angular, etc.).
• Troubleshoot complex issues and proactively resolve performance bottlenecks.
• Introduce improvements to development workflows, testing, and CI/CD as appropriate.
Requirements
You must be an experienced frontend developer with a proven record of delivering sophisticated web applications and driving frontend architecture.
• Extensive experience building sophisticated web applications with JavaScript.
• Expertise in modern frontend frameworks (for example React, Vue, or Angular) and state management tools.
• Demonstrated ability to write clean, maintainable, and well-documented code.
• Strong understanding of web performance optimization and responsive design principles.
• Excellent written and verbal communication skills and experience working in remote, distributed teams.
• Proven track record of leading development initiatives and mentoring others.
Helpful background (nice-to-have)
• Experience mentoring or coaching other developers.
• Background building accessible and internationalized web interfaces.
• Familiarity with automated testing, CI/CD pipelines, and version control systems.
Compensation, time, and logistics
This is a contractor, part-time role expected to run at 20+ hours per week. The project is fully remote and available worldwide.
Pay is per hour in USD. Hourly pay range: $20–$50 USD/hour (pay-per-hour; listed rate up to $50/hr).
• Languages required: English.
• Employment type: Contractor, Part-time.
• Data type: computer code/programming; label types include computer programming/coding tasks.
Who should apply and how it works
Apply if you are an expert JavaScript frontend developer who enjoys technical leadership, clean architecture, and mentoring while contributing to AI training initiatives. This role is well-suited to people who want flexible, remote work that directly impacts how AI systems learn from real-world code and interface interactions.
To apply, create (or use) your OpenTrain profile, highlight relevant frontend experience and leadership examples, and submit your application. OpenTrain will help match your profile to OpenTrain's project and guide next steps.