We are seeking a talented **Senior JavaScript Developer** to join our team. You will play a crucial role in enhancing the quality, reliability, and performance of our existing applications. This position requires strong technical expertise, collaboration skills, and a proactive approach to problem\-solving in a fast\-paced environment. *We accept* *CVs in English only.* **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** * Learning Culture \- We want you to be the best version of yourself, that is why we offer unlimited access to learning platforms, a wide range of internal courses, and all the knowledge you need to grow professionally * Health Coverage \- Health and wellness are important, that is why we have you and up to four family members in a premiere health plan. We have a couple of options, so you can choose what is best for you and your family * Visual Benefit \- Seeing your work for us would be a sight for sore eyes. We want your vision to always be at 100% which is why we offer up to $200\.000 COP for any visual health expenses * Life Insurance Plan \- We have partnered with MetLife to offer a full\-coverage Ife insurance plan. So, your family is covered, even if you are gone. * Medical Leave Coverage \- We are one of the few companies that cover 100% of your medical leave, for up to 90 days. Your health is the most important thing to us * Professional Growth Opportunities \- We have designed a highly competitive and complete development process, where you will have all the tools to get where you have always wanted to be, personally and professionally * Stock Option Purchase Plan \- As an EPAMer you can be more than just an employee, you will also have the opportunity to purchase stock at a reduced price and become a part owner of our organization * Additional Income \- Besides your regular salary, you will also have the chance to earn extra income by referring talent, being a technical interviewer, and many more ways * Community Benefit \- You will be part of a worldwide community of over 50,000 employees, where you can learn, challenge yourself, stand out, and share your knowledge and experience with multicultural teams! *Please note that even though you are applying for this position, you may be offered other projects to join within EPAM.* EPAM 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.