HTML/CSS - Senior Developers - AI Training - Washington DC, USA

prolificacademicltd; United States; Remote; USD 33,000 - 55,000; Full time

Benefits offered by this job

Flexible remote

Hourly rates up to $40

Job summary

prolificacademicltd is seeking a senior frontend expert to audit generated HTML/CSS and verify rendering across browsers, ensuring usability, accessibility and maintainability.

You will assess layouts, styles, and design-system implementations, delivering structured feedback. The role supports flexible remote participation with assignments offered at up to $40/hour depending on skills and experience.

Qualifications

• Bachelor's degree or higher in CS or related technical discipline.
• Real-world experience as a senior frontend developer/UI engineer specializing in HTML/CSS.
• Ability to implement complex responsive components without frameworks.
• Deep understanding of the CSS cascade, specificity, box model, Flexbox and Grid.
• Familiarity with accessibility standards and cross-browser compatibility.

Responsibilities

• Evaluate generated markup and stylesheets for correctness, semantics and best practices.
• Check the technical reasoning behind proposed layouts and styling solutions.
• Execute code and verify visual output and behaviour across browsers.
• Spot inaccessible patterns, brittle selectors, deprecated markup and invalid CSS.
• Provide structured feedback on responsive design, component architecture and design systems.

Skills

Frontend development

HTML & CSS

Accessibility

Cross-browser testing

Education

Bachelor's degree in CS

Tools

Tailwind CSS

Sass/SCSS

CSS Modules

Browser DevTools

Job description

Role overview

Apply senior HTML and CSS expertise to paid work that trains and evaluates AI systems. Tasks center on inspecting generated frontend code, verifying how it renders, and assessing whether the model’s implementation choices meet standards for usability, accessibility, and maintainability.

Responsibilities

• Evaluate generated markup and stylesheets for correctness, semantics, and adherence to good practice.
• Check the technical reasoning behind proposed layouts and styling solutions.
• Execute code and verify its visual output and behaviour in different browsers.
• Spot inaccessible patterns, inefficient or brittle selectors, deprecated markup, and invalid CSS.
• Write structured feedback about responsive design, component architecture, and design system implementation.

Requirements

• A bachelor’s degree or higher in computer science, software engineering, web development, or a related technical discipline.
• Real‑world experience as a senior frontend developer or UI engineer specialising in HTML and CSS.
• Ability to implement complex responsive components and layouts without relying on frameworks or libraries.
• Deep understanding of the CSS cascade, specificity, the box model, Flexbox, and CSS Grid.
• Knowledge of accessibility standards and cross‑browser compatibility, with a strong focus on clean semantic HTML and maintainable CSS.
• Familiarity with modern HTML and CSS features, browser developer tools, and accessibility checks.

Nice to have

• Experience with Tailwind CSS, Sass/SCSS, CSS Modules, component‑based design systems, or cross‑browser testing tools.

Benefits and work setup

• Flexible remote participation follows a short skills assessment.
• Paid assignments can require one uninterrupted hour, although many are shorter. Listed rates reach up to $40 per hour depending on skills and experience.