Senior .NET Engineer

Job Title: Senior .NET Modernization Engineer (AWS | Linux | .NET Core)

Location: Mumbai / Pune (Work from Office)

Experience: 5+ Years

Company: PibyThree (πby3) Consulting Services Pvt Ltd

Website: http://pibythree.com

About Us

πby3 is a cloud transformation company helping enterprises build future-ready solutions with deep technology expertise, optimized cost, reduced risk, and strong delivery ownership.

Overview

We are looking for a Senior .NET Modernization Engineer with strong experience in migrating enterprise applications from .NET Framework 4.x to .NET 8/9, re-platforming them to run natively on Linux, and deploying them on AWS cloud infrastructure. The ideal candidate will have hands-on expertise in application modernization, cloud-native architecture, and Linux-based .NET Core deployments.

Key Responsibilities

• Assess and analyze existing .NET Framework applications for modernization and cloud readiness.
• Plan and execute migration from .NET Framework 4.x to .NET 6/8/9, targeting cross-platform (Linux) compatibility.
• Migrate ASP.NET MVC/Web API applications to ASP.NET Core.
• Refactor legacy code, replace Windows-specific/unsupported APIs, and adopt modern, cloud-native architecture.
• Re-platform and validate applications to run natively on Linux (containers and/or VMs).
• Implement Dependency Injection, configuration management (including AWS-native config/secrets), and centralized logging.
• Upgrade Entity Framework 6 to Entity Framework Core and ensure database compatibility (SQL Server, PostgreSQL, or Aurora).
• Design and deploy solutions on AWS using services such as EC2, ECS/EKS, Lambda, RDS, S3, CloudWatch, and IAM.
• Build and maintain CI/CD pipelines using AWS CodePipeline, GitHub Actions, or Azure DevOps for automated build, test, and deployment.
• Containerize applications using Docker and orchestrate deployments using Kubernetes/EKS.
• Develop and execute unit, integration, and regression testing to ensure migration quality.
• Collaborate with cross-functional teams and provide technical guidance on modernization and cloud strategy.
• Document migration strategies, technical decisions, cloud architecture, and best practices.
  
  

Required Technical Skills

• C#, .NET Framework 4.x, .NET 6/8+, ASP.NET MVC, Web API, ASP.NET Core
• Mandatory: Hands-on experience in application modernization (.NET Framework → .NET Core/.NET 8/9 running on Linux).
• Mandatory: Hands-on experience deploying and managing .NET applications on AWS (EC2, ECS/EKS, Lambda, S3, RDS, CloudWatch, IAM).
• Strong command-line/Linux administration skills (shell scripting, systemd, Nginx/Apache reverse proxy setup for Kestrel).
• OOP, SOLID Principles, Design Patterns, Dependency Injection
• REST APIs, Microservices architecture
• SQL Server / PostgreSQL, Entity Framework 6/Core, LINQ
• Docker and container-based deployment
• Visual Studio / VS Code, Git, GitHub, AWS CLI
• xUnit/NUnit, Unit & Integration Testing
  
  

Preferred Skills

• Experience with .NET Upgrade Assistant.
• Experience migrating Web Forms applications.
• Knowledge of WCF modernization strategies (e.g., CoreWCF, gRPC).
• AWS certifications (Solutions Architect, Developer Associate, or equivalent).
• Kubernetes (EKS) exposure and Infrastructure as Code (Terraform/CloudFormation/CDK).
• Application performance tuning and monitoring (CloudWatch, Application Insights, or similar APM tools).
• Experience with serverless architecture (AWS Lambda, API Gateway).
• Blazor, Angular, or React experience.
  
  

Qualifications

• Bachelor's degree in Computer Science, Information Technology, or related field.
• 5+ years of experience in .NET development.
• 2+ years of experience with modern .NET (.NET Core/.NET 6+) running on Linux.
• Proven experience in application migration/modernization initiatives with cloud deployment on AWS.
• Strong understanding of software architecture, containerization, and enterprise application development.
  
  

Skills: linux,asp.net,agentic ai,.net,aws