Senior .NET Engineer with AWS

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