Senior .NET Developer

NetImpact Strategies is seeking a Senior .NET Developer to join our talented team supporting the development, modernization, and operation of a high-availability, enterprise-scale application in an AWS GovCloud environment. The ideal candidate is a highly experienced, hands-on developer who can take ownership of a complex production codebase, provide technical leadership, and work closely with technical leads, operations teams, and other stakeholders to deliver secure, scalable, resilient, and maintainable solutions. The application is built on a cloud-native microservices architecture consisting of approximately a dozen services and processes millions of messages each month. The technology stack includes .NET 10 / .NET Core, REST APIs, PostgreSQL on AWS RDS, RabbitMQ, AWS SQS, Docker, Kubernetes managed through Rancher, and AWS GovCloud. The environment also makes extensive use of AI-assisted software development tools and AI development frameworks to accelerate engineering while maintaining rigorous standards for code quality, security, and maintainability.

This is a hands-on senior development role requiring strong coding skills, technical ownership, production troubleshooting capabilities, and the ability to work across all layers of a mission-critical enterprise application.

Key Responsibilities

- Serve as a senior, hands-on developer responsible for the design, development, maintenance, and continuous improvement of a large-scale production application

- Take ownership of the application codebase and work closely with the Technical Lead to establish technical direction, engineering standards, and development best practices

- Design, develop, enhance, and maintain microservices and RESTful APIs using C# and .NET 10 / .NET Core

- Develop and support cloud-native applications deployed within AWS GovCloud

- Design and maintain scalable, resilient, and highly available services capable of processing millions of messages per month

- Develop and support event-driven and asynchronous processing solutions leveraging RabbitMQ and AWS SQS

- Design, develop, and optimize data access and persistence solutions using PostgreSQL hosted in AWS RDS

- Develop, deploy, troubleshoot, and maintain containerized applications using Docker and Kubernetes, including Kubernetes environments managed through Rancher

- Support the integration and operation of machine learning capabilities within the application’s microservices architecture

- Utilize AI-assisted development tools, code-generation technologies, AI agents, and AI development frameworks to improve developer productivity and accelerate software delivery

- Review AI-generated code and ensure it meets application architecture, security, maintainability, performance, and coding standards

- Perform code reviews, mentor developers, troubleshoot complex technical issues, and help establish engineering best practices across the development team

- Maintain high standards for code quality and security through automated scanning and static code analysis, including SonarQube

- Manage source code and participate in development and CI/CD workflows using Azure DevOps (ADO)

- Diagnose and resolve application performance, scalability, reliability, messaging, database, and integration issues across the technology stack

- Partner closely with operations and engineering teams to monitor and maintain production application health and availability

- Support production releases, deployments, troubleshooting, and incident resolution

- Participate in occasional after-hours support for planned production releases and critical production incidents, in coordination with the operations team

- Identify opportunities to improve application architecture, performance, resiliency, observability, automation, and developer productivity

- Participate in Agile development activities, technical planning, estimation, design reviews, and continuous improvement initiatives