Frontend Engineer

Position:

Frontend Engineer

Type:

Contract

Compensation:

(Remote | $65–$120/hr)

Location:

Remote

About the Opportunity This opportunity is for experienced

Frontend Engineers

with expertise in

frontend development, JavaScript, TypeScript, modern web frameworks, UI implementation, responsive design, and web performance

to contribute to advanced

AI research and evaluation projects . In this role, you'll apply your engineering expertise to evaluate

AI-generated frontend code, user interfaces, web applications, and technical implementations . Your work will help improve the

coding accuracy, reasoning, UI quality, and software engineering capabilities

of next-generation AI systems. No prior

AI experience

is required. Your

frontend engineering expertise, programming skills, and experience building high-quality web interfaces

are the primary qualifications for success in this role. Responsibilities Evaluate

AI-generated frontend code, web applications, and UI implementations

for

correctness, quality, maintainability, and performance . Build, review, and improve

responsive, accessible, and user-friendly web interfaces . Apply expertise in

JavaScript, TypeScript, HTML, CSS, and modern frontend frameworks . Review AI-generated implementations for

bugs, edge cases, rendering issues, accessibility concerns, and performance bottlenecks . Implement and evaluate

components, design systems, user interfaces, and interactive web features . Ensure

pixel-accurate UI implementation

while maintaining responsiveness across different devices and screen sizes. Debug and refactor existing

frontend codebases

to improve

performance, scalability, and maintainability . Apply best practices in

web accessibility, browser compatibility, frontend architecture, and user experience .



Provide structured technical feedback to improve

AI coding accuracy, reasoning, and frontend development capabilities . Required Qualifications Bachelor's degree or equivalent professional experience

in

Computer Science, Software Engineering, Information Technology, or a related technical field . Professional experience in

frontend engineering, frontend development, web development, or UI engineering . Strong proficiency in

JavaScript and/or TypeScript . Experience with modern frontend frameworks such as

React, Angular, Vue.js, or similar technologies . Strong understanding of

HTML, CSS, responsive design, and component-based architecture . Experience implementing

pixel-accurate user interfaces and component style guides . Strong skills in

debugging, code review, performance optimization, and frontend problem-solving . Excellent

analytical thinking, written communication, and attention to detail . Ability to work independently in a

fully remote environment . Preferred Qualifications Experience building

large-scale web applications or production frontend systems . Familiarity with

Next.js, state management libraries, frontend testing frameworks, and API integration . Experience with

design systems, UI component libraries, and accessibility standards . Familiarity with

Git, GitHub, CI/CD pipelines, and modern frontend development workflows . Experience optimizing

web performance, Core Web Vitals, and browser rendering performance . Familiarity with

AI coding tools, AI-assisted development, or AI model evaluation . Experience contributing to

open-source projects or collaborative software development environments . Compensation Competitive compensation of up to $90/hour. Weekly payments. Independent contractor engagement. Application Process Easy Apply on LinkedIn Check Email for Next Steps Participate in Resume Evaluation & Interview Stage

📌 Frontend Engineer (Remote | $65–$120/hr) (Madrid)
🏢 Synthires
📍 Madrid