Senior Javascript Developer

We are seeking a talented **Senior JavaScript Developer**to join our team.**Responsibilities**- Lead initiatives to improve code quality, refactor legacy codebases, and implement best practices for scalability and maintainability- Manage complex state and side-effects using Redux and React Context- Develop robust unit and integration tests leveraging React Testing Library and Mock Service Worker (MSW)- Create and maintain reliable end-to-end (E2E) tests using Playwright- Collaborate closely with product managers, designers, and backend engineers to deliver high-quality features- Participate in code reviews, design discussions, and contribute to improving team workflows and practices- Work independently while maintaining consistent communication with the team via asynchronous tools and standups**Requirements**:- Bachelor’s or Master’s degree in Computer Science or a related field- At least 3 years of professional front-end development experience, preferably in e-commerce or SaaS environments- Proficiency in React with TypeScript and JavaScript- Hands-on experience with React Testing Library and Mock Service Worker (MSW)- Strong knowledge of GraphQL and REST APIs integration- Expertise in managing state with Redux and React Context- Familiarity with E2E testing frameworks like Playwright- Experience with performance tooling and observability platforms such as Sentry- Understanding of CI/CD workflows and their implementation in software development- Excellent collaboration and communication skills, valuing teamwork as much as technical execution- Ability to work autonomously in a contract capacity while balancing speed and quality- Fluent English communication skills, both written and spoken, at a B2 level or higher**Nice to have**- Hands-on experience with Agile methodologies, such as Scrum or Kanban**We offer**- Career plan and real growth opportunities- Unlimited access to LinkedIn learning solutions- International Mobility Plan within 25 countries- Constant training, mentoring, online corporate courses, eLearning and more- English classes with a certified teacher- Support for employee’s initiatives (Algorithms club, toastmasters, agile club and more)- Enjoyable working environment (Gaming room, napping area, amenities, events, sport teams and more)- Flexible work schedule and dress code- Collaborate in a multicultural environment and share best practices from around the globe- Hired directly by EPAM & 100% under payroll- Law benefits (IMSS, INFONAVIT, 25% vacation bonus)- Major medical expenses insurance: Life, Major medical expenses with dental & visual coverage (for the employee and direct family members)- 13 % employee savings fund, capped to the law limit- Grocery coupons- 30 days December bonus- Employee Stock Purchase Plan- 12 vacations days plus 4 floating days- Official Mexican holidays, plus 5 extra holidays (Maundry Thursday and Friday, November 2nd, December 24th & 31st)- Monthly non-taxable amount for the electricity and internet billsEPAM is a leading global provider of digital platform engineering and development services. We are committed to having a positive impact on our customers, our employees, and our communities. We embrace a dynamic and inclusive culture. Here you will collaborate with multi-national teams, contribute to a myriad of innovative projects that deliver the most creative and cutting-edge solutions, and have an opportunity to continuously learn and grow. No matter where you are located, you will join a dedicated, creative, and diverse community that will help you discover your fullest potential.