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# Frontend Engineer

- **Company:** Synthires
- **Location:** Nava, Spain (Remote available)
- **Salary:** €135,200.0
- **Contract:** Permanent contract
- **Skills:** Web Interfaces, HTML, JavaScript (Programming Language), Web Accessibility, Application Programming Interfaces (APIs), Artificial Intelligence, Component-Based Software Engineering, Browser Compatibility, Cascading Style Sheets (CSS), Code Review, Collaborative Software, Computer Programming, Continuous Integration, Software Debugging, Web Development, Github, Design of User Interfaces, Open Source Technology, Performance Tuning, Next.js, Responsive Web Design, Software Engineering, TypeScript, Web Applications, Web Application Frameworks, Web Performance Optimization, Web Usability, ReactJS, Git, Vue.js, AngularJS, Material UI, Information Technology, Front End Software Development, React Redux
- **Published:** August 23, 2026
- **Apply:** https://www.buscojobs.com.es/frontend-engineer-en-nava-ID-368804666

## About the Role

Frontend EngineerPosition: Frontend EngineerType: ContractCompensation: (Remote | $65-$120/hr)Location: RemoteAbout the OpportunityThis 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.ResponsibilitiesEvaluate 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 QualificationsBachelor'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
QualificationsExperience 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.CompensationCompetitive compensation of up to $90/hour.Weekly payments.Independent contractor engagement.Application ProcessEasy Apply on LinkedInCheck Email for Next StepsParticipate in Resume Evaluation & Interview Stage

## Description

Frontend EngineerPosition: Frontend EngineerType: ContractCompensation: (Remote | $65-$120/hr)Location: RemoteAbout the OpportunityThis 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.ResponsibilitiesEvaluate 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 QualificationsBachelor'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 QualificationsExperience 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.CompensationCompetitive compensation of up to $90/hour.Weekly payments.Independent contractor engagement.Application ProcessEasy Apply on LinkedInCheck Email for Next StepsParticipate in Resume Evaluation & Interview Stage


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