Senior PHP Full-Stack Engineer with React

We are looking for a Senior PHP Full Stack Engineer with React to join our team! Our client is transforming how leading companies search, analyze, and use patent data through an all-in-one, AI-powered SaaS platform that supports drafting, prior art analysis, collaboration, and project management. The role sits within a multidisciplinary team of IP software specialists, patent data professionals, and patent attorneys, focused on deep-cleaning and organizing global patent data to deliver accurate insights and trend visualizations. The Engineer will be responsible for developing, maintaining, and evolving key areas of the website and related user-facing products. Responsibilities: Design, build, and maintain the front-end interface for product delivery areas of the client application site, as agreed from time to time with product stakeholders, product designers, and the Technical Program Manager. Initially focusing on resolving known and documented bugs across existing products before contributing to ongoing enhancements and new feature development. Implement responsive layouts and ensure cross-browser/device compatibility Deliver clean, intuitive UI/UX by working against a ticket-based backlog with direction and, as projects evolve, collaborating more directly with product stakeholders. Work with external developers and designers to ensure consistent branding, performance, and technical quality Ensure accessibility best practices (WCAG) across relevant areas of the site Optimize site performance through modern tooling, bundling, and code quality improvements Build and maintain additional sections of the client website as needed Develop and manage analytics and testing frameworks, including Google Analytics, event tracking, and A/B testing capability Provide basic database or API integration support, working alongside the back-end engineering team where appropriate Assist in documentation of front-end components, design patterns, and development processes Contribute to continuous improvement of development workflows, version control practices, and release processes Write and maintain automated tests including unit, integration, and end-to-end (E2E) tests to ensure application quality and reliability. Requirements: 5+ years of experience working in standalone roles responsible for the development and maintenance of web interfaces Strong knowledge of the following technical areas: PHP, JavaScript, React Experience with D3, Azure, XML & JSON data formats Ability to produce scalable, maintainable solutions Strong time-management skills with the ability to handle multiple projects concurrently A proactive, positive approach to delivering high-quality work English level - at least Upper-Intermediate Nice to have: .NET Framework 4.6 is a big plus MySQL or SQL Server experience Experience setting up A/B testing or similar experimentation frameworks Exposure to modern AI-powered development tools and workflows (e.g., code assistants, automated testing, or AI-driven UI optimization) We offer*: Flexible working format - remote, office-based or flexible A competitive salary and good compensation package Personalized career growth Professional development tools (mentorship program, tech talks and trainings, centers of excellence, and more) Active tech communities with regular knowledge sharing Education reimbursement Memorable anniversary presents Corporate events and team buildings Other location-specific benefits *not applicable for freelancers