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Weekend User Interface Tester Jobs in California

UI Lead Engineer

Dublin, CA · On-site

$117K - $156K/yr

Code Quality: Follow best practices in code reviews, testing, and debugging to maintain a high-quality codebase. Qualifications Must-Have: * 5+ years of experience in frontend/UI development.

UX/UI Designer

Fremont, CA · On-site +1

$128K - $200K/yr

About The Role We are seeking a UX/UI Designer to join our growing team. In this role, you will be ... Experience with prototyping and usability testing. * Strong communication and collaboration skills.

About The Role We are seeking a UX/UI Designer to join our growing team. In this role, you will be ... Experience with prototyping and usability testing. * Strong communication and collaboration skills.

UI Developer

Sunnyvale, CA · On-site

$58.75 - $76.25/hr

Halo Group's experienced consultants in Detroit, Atlanta and Dallas specialize in all areas of product/project governance, UX/UI, multi-platform applications, quality assurance/testing, cloud ...

UX/UI DESIGNER

Hayward, CA · On-site

$95K - $110K/yr

The UI/UX Designer conducts user research, creates wireframes and prototypes, validates designs through usability testing, and ensures consistency with the organization's design standards. Reporting ...

Be it core Java, full-stack Java, Web/UI designers, Big Data or Cloud or Mobility developers ... Support overall systems testing and the migration of platforms and applications to production.

UX/UI DESIGNER

Hayward, CA · On-site

$95K - $110K/yr

The UI/UX Designer conducts user research, creates wireframes and prototypes, validates designs through usability testing, and ensures consistency with the organization's design standards. Reporting ...

Lead Game UX/UI Designer

Santa Monica, CA · On-site

$150K - $190K/yr

Conduct user testing and gather feedback to refine UI/UX designs. * Ensure consistency and adherence to UI/UX best practices across the game. * Optimize UI for different platforms, including PC ...

UI/UX Engineer (10+ yrs)

Woodland Hills, CA · On-site

$99K - $123K/yr

Role: UI/UX Engineer Location: Woodland Hills, CA (Onsite from Day 1) Job Type: Contract Must Have ... Conduct user research and usability testing to gather insights and validate design concepts.

UI Developer

Mountain View, CA · On-site

$49.29 - $59.29/hr

... UI, Tailwind CSS, or equivalent) * API integration skills - RESTful and GraphQL; async patterns ... Build tooling and testing proficiency - Webpack/Vite, Jest, React Testing Library, Cypress; Git ...

$93K - $156K/yr

Participate in system testing, integration, and acceptance activities in accordance with DHS and CBP security requirements * Ensure UI designs meet DHS/CBP enterprise architecture, security, and ...

Sr. UI/UX Developer

Irvine, CA · On-site

$53.75 - $69.75/hr

Be it core Java, full-stack Java, Web/UI designers, Big Data or Cloud or Mobility developers ... Testing, Problem Solving, Teamwork Experience with Entity Framework, N-Layer Architecture, ORM ...

Knowledge of JavaScript testing frameworks like Jasmine, QUnit etc is good to have. Qualifications CSS,Javascript,UI,JQuery,MVC,API,Bootstrap,FrontEnd,JSON,HTML5,JSP,SAS,Servlet,Spring Additional ...

Showing results 21-40

Weekend User Interface Tester information

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Infographic showing various Weekend User Interface Tester job openings in California as of August 2026, with employment types broken down into 1% As Needed, 69% Full Time, 25% Part Time, 4% Contract, and 1% Nights. Highlights an 94% Physical, 1% Hybrid, and 5% Remote job distribution.

$117K - $156K/yr

Full-time

This job post has expired today. Applications are no longer accepted.


Job description

We are looking for a UI Engineer to design and develop high-performance, scalable, and user-friendly web applications. The ideal candidate should have strong expertise in React, Redux, JavaScript (ES6), Node.js (ExpressJS). You will play a key role in building responsive UI components, implementing state management, and developing using Node.js/ExpressJS.
Responsibilities
• UI Development: Build elegant, responsive, and high-performance user interfaces using React, Redux, JavaScript (ES6+), HTML5, and CSS3.
• Component Design: Develop reusable, modular, and scalable UI components that align with design and accessibility standards.
• State Management: Implement and optimize Redux for efficient state handling.
• Backend-for-Frontend (BFF): Develop and maintain lightweight Node.js (ExpressJS) APIs to bridge UI with backend services.
• Performance Optimization: Optimize UI components for speed, scalability, and performance.
• Version Control & Packages: Use GitHub for source control, manage dependencies with npm, and ensure a structured project setup.
• Cross-Browser Compatibility: Ensure UI consistency across multiple browsers and devices.
• Collaboration: Work closely with backend engineers, UX designers, and product managers to deliver a seamless user experience.
• Code Quality: Follow best practices in code reviews, testing, and debugging to maintain a high-quality codebase.
Qualifications
Must-Have:
• 5+ years of experience in frontend/UI development.
• Strong expertise in React.js, Redux, JavaScript (ES6+), and HTML5/CSS3.
• Experience with Node.js and ExpressJS development.
• Deep understanding of component-based architecture and state management in React.
• Proficiency in GitHub for version control and npm packages for dependency management.
• Hands-on experience with CI/CD pipelines for frontend deployments with GitHub Actions.
• Strong debugging and troubleshooting skills for frontend performance issues.
• Familiarity with RESTful APIs and integrating frontend applications with backend services.
• Ability to write clean, maintainable, and well-documented code.
• Strong communication and collaboration skills.
Good to Have:
• Knowledge of Styled Components, SASS, or React Material UI.
• Familiarity with Next.js for server-side rendering
• Understanding of web accessibility (a11y).