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Lead .NET Developer with AWS expertise

Hybrid in Republic of Lithuania
.NET& 2 others
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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)