Senior Frontend Developer

About Us Checker is an enterprise-scale digital platform crafted for mystery shopping, CX/VoC research, and end-to-end field-work automation. With over 20 years of experience in research solutions and technology integration, we empower global agencies and brands to streamline workflows, deliver actionable insights, and elevate customer experiences. Learn more at checker-soft.com. Role & Responsibilities Develop and enhance front-end web applications using ReactJS and modern JavaScript libraries. Collaborate closely with backend engineers and product teams to create intuitive and high-performing interfaces. Implement responsive design and ensure cross-browser compatibility. Optimize components for performance, scalability, and reusability. Maintain UI consistency and contribute to improving the user experience of Checker’s products.  Requirements At least 4 years of hands-on experience with ReactJS, JavaScript (ES6+), HTML5, and CSS3. Strong understanding of state management (Redux, Zustand, or Context API). Experience with RESTful APIs integration and modern front-end build tools (Webpack, Vite, etc.). Familiar with UI/UX best practices and responsive design. Good understanding of Git, agile workflow, and code review practices. Excellent communication skills in English and Vietnamese. Experience working with global or distributed teams is highly value