Advanced Software Engineer - .NET

About the Role

*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.* We are seeking a highly skilled **Advanced Software Engineer with deep expertise in the .NET ecosystem** to join our team. In this role, you will design, evolve, and optimize large\-scale, high\-load systems while ensuring top\-tier performance, security, and reliability. You will also leverage modern AI development tools to enhance productivity and code quality. **Responsibilities** * Design, develop, and maintain large monolithic systems, ensuring scalability and long\-term evolution * Build and optimize high\-load applications using the C\# / .NET ecosystem * Design REST APIs with a focus on scalability, versioning, and security * Integrate with SOAP and legacy systems as needed * Perform advanced MSSQL performance tuning, transaction optimization, and handle blocking, locking, and concurrency * Drive performance optimization, concurrency management, and fault tolerance across services * Implement secure communication using TLS/SSL and manage certificate handling * Apply secure coding practices and mitigate common vulnerabilities (OWASP Top 10\) * Conduct threat modeling and define mitigation strategies for critical systems * Identify and prevent vulnerabilities such as injection attacks, authentication flaws, and data leaks * Leverage AI development tools and agents to generate production\-quality code and tests * Review, evaluate, and govern AI\-generated output to maintain high engineering standards **Requirements** * 12\+ years of professional software engineering experience * Deep expertise in the C\# / .NET ecosystem * Proven background in designing and working with high\-load systems * Strong skills in REST API design (scalability, versioning, security) and SOAP / legacy integrations * Advanced proficiency in MSSQL, including performance tuning at scale, transaction optimization, and concurrency handling (blocking and locking) * Showcase of designing and evolving large monolithic systems * Expertise in performance optimization, concurrency, and fault tolerance * Deep understanding of application security, including TLS/SSL, secure communication, and certificate handling * Familiarity with secure coding practices, OWASP Top 10, and threat modeling and mitigation strategies * Capability to identify and prevent vulnerabilities such as injection, authentication flaws, and data leaks * Strong experience using and evaluating AI development tools and agents for generating production\-quality code, tests, and governing AI output * Proficiency in English at an Upper\-Intermediate level (B2\) or higher **We offer** * Opportunity to work on technical challenges that may impact across geographies * Vast opportunities for self\-development: online university, knowledge sharing opportunities globally, learning opportunities through external certifications * Opportunity to share your ideas on international platforms * Sponsored Tech Talks \& Hackathons * Unlimited access to LinkedIn learning solutions * Possibility to relocate to any EPAM office for short and long\-term projects * Focused individual development * Benefit package: + Health benefits + Retirement benefits + Paid time off + Flexible benefits * Forums to explore beyond work passion (CSR, photography, painting, sports, etc.)