We are seeking a **Senior Kotlin Engineer** to develop backend services for award\-winning mobile applications. Collaborate with engineers, product managers, designers, and QA to create new products and platforms. Apply your technical skills and creativity to solve challenging problems and deliver high\-quality code. We encourage you to apply and contribute to our innovative projects. 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. **Responsibilities** * Build server\-side applications supporting mobile clients * Write, refactor, and delete code to improve system quality * Design solutions for open\-ended problems * Integrate backend services with bespoke legacy systems * Conduct performance analysis and optimization * Develop and maintain unit tests * Fix bugs and address technical debt * Implement asynchronous code to improve responsiveness * Collaborate with cross\-functional teams including product, design, and QA * Utilize build tools and continuous integration pipelines * Contribute to open source projects and internal knowledge sharing * Self\-start and drive tasks to completion **Requirements** * Bachelor’s degree in Computer Science or related field or equivalent experience * 3\+ years of experience in Kotlin development * Proficient in building server\-side applications and REST APIs * Experience with asynchronous programming and performance optimization * Familiarity with Gradle and continuous integration * Ability to work effectively within a team environment * Upper\-Intermediate English language proficiency (B2\) **Nice to have** * Knowledge of GraphQL and RAML specifications * Experience with Docker containerization * Background in unit testing best practices * Familiarity with legacy codebase maintenance **We offer** * Connectivity Bonus (25,000 ARS are paid with a salary receipt at the end of each month as a non\-wages concept). * Medicina Prepaga (It covers the collaborator and direct family group). * Paternity Leave (Two additional days are added to what is established by law, total of 4 days). * Discounts card. * English Training (English lessons, twice per week). * Training Program (Access to multiple customized training plans according to the needs of each role within the company). * Marriage bonus (The company doubles the allowance established by law that ANSES offers). * Referral Program (Referral bonus is paid when the referral of a collaborator joins the Company). * External Agreements and Discounts. * Vacations: 14 calendar days a year *By applying to our role, you are agreeing that your personal data may be used as in set out in EPAM´s Privacy Notice and Policy.*