Frontend UI Engineer

OpenTrain AI, Inc.; Northern (KY); Hybrid; USD 90,000 - 130,000; Full time

Job summary

OpenTrain is seeking a contract Frontend UI Engineer to design, build, and polish accessible interfaces for next-generation AI training systems. You will translate product needs into responsive, cross-device UI solutions while collaborating with product, design, and backend teams.

You will work in a fully remote, distributed environment, applying modern frontend practices and contributing to UI quality, performance, and consistency across platforms.

Qualifications

• Strong knowledge of UI design principles and frontend development methodologies.
• Extensive experience with React, Vue, Angular, or comparable modern frontend frameworks.
• Proficiency in HTML, CSS, JavaScript, and component-based architectures.
• Strong written and verbal communication skills.
• Ability to work independently in a fully remote, distributed environment.
• Careful attention to detail, pixel-level execution, and empathy for end users.

Responsibilities

• Design and develop high-quality user interfaces with a strong focus on usability and accessibility.
• Translate requirements into elegant, functional UI solutions with product, design, and backend collaborators.
• Build responsive experiences for cross-platform and cross-device use.
• Apply component reuse and frontend performance best practices.
• Participate in design reviews and provide constructive feedback on UI quality and consistency.
• Document technical decisions for technical and non-technical stakeholders.
• Track relevant UI technologies and apply sound contemporary development practices.

Skills

UI design principles

Frontend development

React/Vue/Angular

HTML/CSS/JavaScript

Communication

Remote work

Attention to detail

Job description

About OpenTrain
OpenTrain is the centralized, open platform where AI training and data-labeling freelancers find work, consolidate opportunities across platforms, and build a unified AI training portfolio they control. We make specialized AI training work easier to track, apply for, and grow into a durable freelance career.

About this role
OpenTrain is recruiting for a contract Frontend UI Engineer who will apply practical interface-building expertise to work supporting next-generation AI systems. You will create polished, usable, and accessible interfaces while translating product needs into responsive experiences that work across platforms and devices. The role combines hands-on frontend development with thoughtful review of interface quality, performance, consistency, and end-user experience.

What you will do
Design and develop high-quality user interfaces with a strong focus on usability and accessibility. Translate requirements into elegant, functional UI solutions with product, design, and backend collaborators. Build responsive experiences for cross-platform and cross-device use. Apply component reuse and frontend performance best practices. Participate in design reviews and provide constructive feedback on UI quality and consistency. Document technical decisions for technical and non-technical stakeholders. Track relevant UI technologies and apply sound contemporary development practices.

Required skills
Strong knowledge of UI design principles and frontend development methodologies. Extensive experience with React, Vue, Angular, or comparable modern frontend frameworks. Proficiency in HTML, CSS, JavaScript, and component-based architectures. Strong written and verbal communication skills. Ability to work independently in a fully remote, distributed environment. Careful attention to detail, pixel-level execution, and empathy for end users.

Helpful background
Experience with UI animation, micro-interactions, design systems, accessible digital products, inclusive design, or cross-functional remote teams is helpful. Familiarity with the wider AI training context is not required, so the role is suited to frontend professionals whose domain expertise can contribute high-quality real-world input to AI systems.

Why work with OpenTrain
OpenTrain gives freelancers one place to manage AI training opportunities instead of rebuilding proof of work on every platform. A stronger OpenTrain profile helps you show credible experience, discover roles that match your skills, and turn AI training and data-labeling work into a long-term portfolio.