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Freelance User Interface Tester Jobs in California

3MK Software Solutions

ExtJS UI Developer

San Diego, CA

$53 - $69/hr

We are looking for UI ExtJS Software Engineer to participate in the development, testing and debugging of web-based G UI application. Requirements: Overall 7+ years of IT experience; We prefer ...

Trinity Technology Solutions

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.

Escalon Services, LLC.

UX/UI Designer

Santa Monica, CA · On-site

$80K - $90K/yr

UX/UI Designer Application Deadline: 30 September 2026 Department: Recruiting Done Employment Type ... Conduct user research, usability testing, and gather feedback to improve product experiences.

Escalon Services, LLC.

UX/UI Designer

Santa Monica, CA · On-site

$80K - $90K/yr

As a UX/UI Designer, you will collaborate closely with Product Managers, Engineers, and cross ... Conduct user research, usability testing, and gather feedback to improve product experiences.

Agility Robotics

UX/UI Designer

Fremont, CA · On-site

$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.

Agility Robotics

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.

Akshaya Inc

UI/UX Product Designer

California City, CA · On-site

... testing, and design validation sessions. • Ensure designs comply with accessibility standards and inclusive design best practices. • Facilitate design workshops within cross-functional Agile ...

Sonoma Consulting Inc.

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 ...

GLS US GROUP

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 ...

Jobsbridge

Web UI Developer

Fresno, CA · On-site

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.

LinTech Global

User Interface Developer

Monterey, CA · On-site

$95K - $105K/yr

Designing graphic user interface elements, like menus, tabs and widgets * Gathering and evaluating ... and testing), gender, sexual orientation, gender identity or expression, military and veteran ...

LinTech Global

User Interface Developer

Monterey, CA · On-site

$55K - $65K/yr

Designing graphic user interface elements, like menus, tabs and widgets * Gathering and evaluating ... and testing), gender, sexual orientation, gender identity or expression, military and veteran ...

Absurd Ventures

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 ...

Escalon

UX/UI Designer

Santa Monica, CA · On-site

$80K - $90K/yr

The Role As a UX/UI Designer, you will work closely with Product Managers, Engineers, and ... Conduct user research, usability testing, and gather feedback to improve product experiences.

GLS US GROUP

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 ...

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Freelance User Interface Tester information

What is a freelance user interface tester?

A Freelance User Interface Tester is a professional who evaluates and tests the design and functionality of user interfaces in software, websites, or applications on a contract or per-project basis. Their role is to identify usability issues, bugs, and inconsistencies to ensure a smooth and user-friendly experience. They work independently for multiple clients, providing feedback and detailed reports to help developers improve the product's interface. Freelance UI testers often use various devices and browsers to simulate real-world usage and catch potential problems before release.

What are the key skills and qualifications needed to thrive as a freelance user interface tester?

A Freelance User Interface Tester needs a solid understanding of usability principles, attention to detail, and experience with web and mobile application testing. Familiarity with testing tools like Selenium, BrowserStack, or TestRail, as well as knowledge of bug tracking systems, is typically required. Exceptional communication, problem-solving, and time management skills help testers provide clear feedback and manage multiple projects efficiently. These abilities ensure that interfaces are user-friendly, functional, and meet client expectations in a competitive digital landscape.

How do freelance user interface testers typically manage communication and feedback with remote development teams?

Freelance User Interface Testers frequently collaborate with remote development teams using project management tools, video calls, and instant messaging platforms. Clear and consistent communication is crucial, as testers need to report usability issues, share feedback, and sometimes demonstrate bugs in real time. They often join daily or weekly stand-ups and provide written reports or annotated screenshots to ensure their findings are understood. Building effective communication channels not only streamlines the testing process but also helps freelancers establish trust and long-term relationships with clients.

What are the most commonly searched types of User Interface Tester jobs in California?

The most popular types of User Interface Tester jobs in California are:

What are popular job titles related to Freelance User Interface Tester jobs in California?

For Freelance User Interface Tester jobs in California, the most frequently searched job titles are:

What job categories do people searching Freelance User Interface Tester jobs in California look for?

The top searched job categories for Freelance User Interface Tester jobs in California are:

What cities in California are hiring for Freelance User Interface Tester jobs?

Cities in California with the most Freelance User Interface Tester job openings:

Freelance User Interface Tester jobs near you
Infographic showing various Freelance User Interface Tester job openings in California as of July 2026, with employment types broken down into 1% Internship, 86% Full Time, 7% Part Time, 1% Temporary, and 5% Contract. Highlights an 71% Physical, 4% Hybrid, and 25% Remote job distribution.

ExtJS UI Developer

3MK Software Solutions

San Diego, CA

$53 - $69/hr

Full-time

Re-posted 29 days ago

Job description

Company Description

3MK Software Solutions is the leading software service soltions provider and IT Staffing Supplier company, outsourcing and complex implementation services for the business across different functional areas and technologies with a core focus on software development and web designing development and GIS Software solutions and services. Our team is our core strength, we have selected the most skilled and talented specialists from the IT industry, and we continuously invest in developing their capabilities. The core management has many years of experience and has successfully leaded complex projects for major corporate in the field of healthcare, communication, retail and finance. During the term of these projects, the team had needed to develop an advanced implementation methodology.

Job Description

Job Title: ExtJS UI Developer

Location: 3 Positions, 3 Locations -- Detroit, MI, Carlsbad, CA and San Diego, CA

Duration: 6+ months

Rate: Open/hr

JD:

We are looking for UI ExtJS Software Engineer to participate in the development, testing and debugging of web-based GUI application.

Requirements:

Overall 7+ years of IT experience;

We prefer working experience of ExtJS 5 or ExtJS 4.2 but any version is ok if they have solid UI development experience.

Strong OOJS, ExtJS, Component oriented design, SASS, HTML5, UI Unit testing, E2E UI Testing

Good to have Angular.JS skills

Good to have: should be familiar with the modular approach in developing applications

Familiarity working with Java, standard ExtJS widgets such as grids, trees, forms, layouts and other standard widgets/components.

Experience in UI design and development.

Solid experience in Sencha Touch or ExtJS ( we prefer at least ExtJS 4 )

creating reusable UI components, widgets with JavaScript

Possess one or more of the following skills:

ExtJS or similar JavaScript frameworks

JavaScript, HTML5, CSS, JSON, XML, MVC

Restful web services

Eclipse, Firebug

Should be able to think on their own feet and provide strategic solutions for UI design.

Experience with object oriented design and programming

Responsibilities:

Design and develop web based user interfaces

Participate in all phases of a product development, from product definition and architecture and design, through implementation, debugging, testing and early customer support.

Work collaboratively with other engineers, and be willing to take on any engineering tasks that contribute to the progress towards the goals of the team and the company

Education & Experience:

A Bachelor of Science Degree in Electrical Engineering or Computer Science, a Master Degree, or a PhD; or equivalent experience.

Additional Information

All your information will be kept confidential according to EEO guidelines.

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