Frontend Software Engineer (Remote | Up to $90/hr)

Company: Synthires

Frontend Engineer
Position: Frontend Engineer
Type: Freelance Hourly Contract
Compensation: $90/hour
Location: Remote
About the Opportunity
This opportunity is for experienced Frontend Engineers and Full-Stack Developers interested in evaluating AI-generated web interfaces and code.
The work focuses on comparing AI-generated frontend implementations against real-world reference websites, assessing both visual fidelity and underlying code quality.
This is an evaluation-focused role rather than a traditional development position. The key requirement is the ability to identify how a webpage is constructed, recognize technical shortcuts, and provide precise, evidence-based evaluations.
What You'll Do
* Render a reference webpage and two AI-generated implementations at a 1920×1080 viewport and evaluate which version most accurately reproduces the reference.
* Compare visual fidelity across different interface states, including layout, spacing, typography, colors, borders, images, layering, and overflow behavior.
* Review the source code of AI-generated implementations and assess HTML structure, CSS architecture, responsiveness, maintainability, and implementation quality.
* Identify technical shortcuts such as excessive hardcoded positioning, unnecessary absolute positioning, poorly structured markup, or image-based recreations.
* Test responsive behavior across different viewport sizes and identify layout or usability defects.
* Use browser DevTools to inspect elements, computed styles, DOM structure, and interactive states.
* Provide specific, evidence-based written justifications explaining why one implementation is stronger than another.
* Identify genuinely broken evaluation tasks while distinguishing them from tasks that are simply challenging.
Required Qualifications
* 3–8 years of professional web development experience, primarily in frontend or full-stack engineering.
* Strong hands-on experience with HTML, CSS, JavaScript, responsive web development, and modern frontend engineering practices.
* Deep understanding of semantic HTML, Flexbox, CSS Grid, media queries, and responsive layouts.
* Ability to read and understand both modern and legacy web layouts, including float-based and table-based designs.
* Strong proficiency with browser Developer Tools, including DOM inspection, computed styles, viewport testing, and interactive state debugging.
* Comfortable working from the command line, including extracting archives, running local development servers, and troubleshooting asset paths.
* Sufficient JavaScript knowledge to understand how scripts interact with the DOM and user interactions.
* Strong professional written English and the ability to provide clear, detailed technical justifications.
* Strong attention to detail and the ability to identify subtle visual and structural differences.
Preferred Qualifications
* Prior experience with RLHF, preference labeling, AI model evaluation, structured code review, or human-feedback projects.
* Pixel-perfect design-to-code experience, including work with design systems, templates, or production web interfaces.
* Knowledge of web accessibility, including ARIA, semantic landmarks, and heading hierarchy.
* Familiarity with common failure patterns in AI-generated frontend code.
* Experience with web scraping, website archiving, DOM parsing, or working with complex crawled website structures.
* Previous experience completing AI evaluation projects and working in multi-hour evaluation sessions.
Equipment Requirements
* Desktop or laptop capable of displaying a 1920×1080 viewport.
* Ability to run a local development environment and static web server.
* Administrator access to your own computer for installing required development tools.
Important Project Requirements
* Each evaluation unit typically takes 2–3 hours and is completed within a defined time window.
* This is not microtask work and requires the ability to dedicate uninterrupted blocks of time to individual evaluations.
* A functioning local development environment is required.
* The role is intended for practicing web developers with strong frontend and UI implementation expertise.
* Backend-only, ML/data-science-only, mobile-native-only, and DevOps-only backgrounds are generally not suitable for this evaluation work.
Compensation
* Competitive compensation of $90/hour.
* Independent contractor engagement.
* Compensation is based on completed evaluation work in accordance with project requirements.
Application Process
1. Easy Apply on LinkedIn
2. Check Email for Next Steps
3. Participate in Resume Evaluation & Interview Stage

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