We are looking for a Senior .NET Developer with AWS experience to join our dynamic and collaborative team.
This engagement focuses on transforming legacy applications into scalable, cloud-native solutions — migrating selected microservices to the latest .NET Core, modernizing from Windows to Linux, optimizing performance, and ensuring seamless integration with AWS services. The work is delivered as an AI-agentic modernization engagement leveraging Kiro and Amazon Transform, aligned with AWS cloud-native best practices and the AWS Well-Architected Framework.
It is a remote position for Poland.
Responsibilities
- Use 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; work closely with AWS ProServe consultants on validation and optimization
- Apply AWS Well‑Architected Framework principles across security, reliability, performance efficiency, and operational excellence
- Capture key findings, migration strategies, code conversion patterns, and technical validation results for long‑term maintainability and knowledge transfer
Requirements
- 3+ years of experience in software engineering with a focus on .NET technologies
- Expertise in C#/.NET Core and advanced proficiency in .NET Framework
- Background in AWS native development at an advanced level
- Skills in microservices architecture and modernizing .NET Legacy (Windows) applications to .NET Core (Linux)
- Proficiency in SQL Server, PostgreSQL and Amazon Aurora PostgreSQL
- Competency in stored procedure migration (T-SQL → PL/pgSQL)
- Qualifications in unit and performance testing
- Excellent English communication skills (B2+ level) with availability to 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
- Experience with Amazon ECS/EKS
- Capability to build CI/CD pipelines using GitHub Actions and CodePipeline