We are seeking a **Senior Server\-side Engineer** to build the Mobile application Service Layer used by millions worldwide. You will work on the Mobile application Service Layer (Backend for Frontend) consumed by award\-winning mobile apps, collaborating with a large team of engineers, product people, designers, and QA. This role requires strong technical skills, creativity, and a passion for solving challenging problems with modern technologies. If you enjoy sharing your ideas and care deeply about user experience and beautiful code, we encourage you to apply. 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 for the mobile service layer * Write clean, efficient, and maintainable code * Refactor legacy code to improve performance and readability * Delete obsolete code to streamline the codebase * Develop and maintain build tools and continuous integration processes * Fix bugs and troubleshoot production issues * Implement asynchronous code for better performance * Analyze and optimize application performance * Create and maintain unit tests to ensure code quality * Collaborate with a cross\-functional team including product, design, and QA * Integrate with bespoke backend services * Design solutions for open\-ended problems * Contribute to open source projects within the team **Requirements** * Bachelor’s degree in Computer Science or a related field, or equivalent experience * Strong experience with algorithms and data structures with 3\+ years in server\-side development * Proficiency in REST API design and implementation * Hands\-on experience with Spring Boot framework * Experience writing unit tests and test\-driven development * Knowledge of asynchronous programming and performance optimization * Ability to work effectively in a team environment * Self\-starting attitude with strong problem\-solving skills * Experience with legacy code refactoring and maintenance * Proficiency in English language, level B2 (Upper\-Intermediate) **Nice to have** * Experience with Docker containerization * Familiarity with Gradle build automation * Knowledge of GraphQL APIs * Proficiency in Kotlin programming language * Experience with RAML API modeling **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.*