Lead .NET Developer with AWS expertise

We are seeking a Lead .NET Developer with strong AWS expertise to drive the modernization of legacy applications into cloud-native, high-performance solutions. In this role, you will leverage AI-powered tools and AWS best practices to design scalable microservices, migrate legacy systems and ensure seamless database compatibility, while collaborating across teams to deliver robust and maintainable software.

Responsibilities

• Leverage Kiro and Amazon Transform to accelerate code analysis, refactoring and migration tasks; validate and optimize tool-generated outputs
• Design and develop high-performance, scalable applications using .NET Core with a microservices architecture
• Migrate and refactor legacy .NET Framework (Windows) applications to .NET Core (Linux), ensuring functional parity and improved performance
• Modify and optimize application code and stored procedures to ensure compatibility with PostgreSQL / Aurora PostgreSQL, following AWS development standards
• Implement unit tests and performance tests to ensure application stability, responsiveness and production readiness
• Partner with database engineers to ensure seamless integration between application code and PostgreSQL
• Collaborate closely with AWS ProServe consultants on validation and optimization activities
• Apply AWS Well-Architected Framework principles across security, reliability, performance efficiency and operational excellence
• Document key findings, migration strategies, code conversion patterns and technical validation results for long-term maintainability and knowledge transfer

Requirements

• 5+ years of expert-level proficiency in C# / .NET Core and advanced experience with .NET Framework
• Advanced expertise in AWS native development
• Background in microservices architecture
• Proven skills in .NET Legacy (Windows) to .NET Core (Linux) modernization
• Advanced proficiency in SQL Server, PostgreSQL and Amazon Aurora PostgreSQL
• Expertise in stored procedure migration (T-SQL → PL/pgSQL)
• Competency in unit and performance testing
• English communication skills with overlap with the US EST time zone

Nice to have

• Familiarity with Kiro and Amazon Transform
• Knowledge of AWS DMS / SCT
• Understanding of Docker and containerization on AWS, including Amazon ECS / EKS
• Skills in CI/CD pipelines (GitHub Actions, CodePipeline)

Benefits

• Engineering Heritage: Best-in-class experts sharing a culture of engineering excellence and tackling complex engineering challenges for over 30 years
• Advanced Tech Stack: Innovative projects where you can apply or enhance your expertise in Cloud, Data, AI, and other emerging technologies
• World-Class Clients: Work closely with 340+ of the Forbes Global 2000 on creating disruptive solutions that make a global impact
• Professional Growth: Exceptional support for career development with comprehensive resources for upskilling or reskilling in pioneering practices
• GenAI Community: Strong AI competencies with 600+ experts across 55+ locations driving GenAI-enabled transformation journeys
• Entrepreneurial Culture: If you're passionate and dedicated to improving business transformation, we provide the support you need to bring your ideas to life
• Hybrid Setup: The flexibility to work from any location in Lithuania, whether it's your home or our dynamic offices in Vilnius and Kaunas
• Other Benefits: Additional vacation and trust days, private health insurance, Employee Stock Purchase Plan and more