HTML and CSS Developer

About the Company

SME Careers is a fast-growing AI data services company and subsidiary of SuperAnnotate that provides AI training data to many of the world’s largest AI companies and foundation model labs. This role contributes frontend expertise to improve AI models used by developers worldwide.

Responsibilities

• Review AI-generated HTML/CSS code, UI layouts, and technical explanations for correctness and clarity.
• Produce high-quality reference implementations and step-by-step reasoning for common and complex frontend tasks.
• Assess solutions for semantic correctness, accessibility, responsiveness, cross-browser compatibility, and adherence to the prompt.
• Identify issues in semantic HTML, layout (Flexbox/Grid), responsive behavior, CSS architecture, specificity/cascade conflicts, and performance.
• Fact-check technical information and rate/compare multiple AI responses based on correctness and reasoning quality.
• Create detailed prompts across HTML/CSS topics and write high-quality reference answers to guide AI learning.
• Test AI outputs for inaccuracies or unsafe recommendations and validate reliability across real-world UI use cases.

Qualifications

• Bachelor’s degree in Computer Science, Design, HCI, or a related field (or equivalent practical experience).
• 4+ years of professional experience building production UIs with semantic HTML and modern CSS.
• Expert-level proficiency in CSS layout (Flexbox, Grid), responsive patterns, and component-based styling approaches.
• Strong accessibility knowledge: semantic structure, ARIA basics, keyboard navigation, focus management, and WCAG-aware design.
• Strong understanding of browser behavior: box model, stacking context, positioning, rendering quirks, and cross-browser testing strategy.
• Experience with CSS maintainability: naming conventions (BEM or similar), design tokens, variables, theming, and avoiding specificity wars.
• Familiarity with modern tooling is a plus (Sass/PostCSS, Tailwind, CSS Modules), but the role focuses on core HTML/CSS correctness.
• Minimum C1 English proficiency (written and spoken) with ability to write clear technical explanations and follow detailed English-language guidelines.
• Proven experience conducting detailed code reviews and enforcing UI quality standards for accessibility, responsiveness, and maintainability.
• Previous experience with AI data training, annotation, or evaluating AI-generated technical content is a strong plus.
• Highly detail-oriented and systematic, with a methodical approach to evaluating reasoning quality and identifying subtle UI issues.

Skills

• Semantic HTML and modern CSS best practices.
• CSS layout techniques (Flexbox, Grid) and responsive design patterns.
• Accessibility (WCAG-aware design, ARIA basics, keyboard/focus management).
• Cross-browser testing strategy and debugging rendering/layout quirks.
• CSS architecture and maintainability (naming conventions, variables, theming).
• Prompt writing and evaluating AI responses for training data.
• Clear technical writing in English for explanations and reference solutions.

Additional Information

• This is a fully remote, hourly paid contractor role.
• There is no immediate project for this role; qualified candidates will be among the first experts contacted when relevant opportunities arise and will gain access to future projects through the expert network.