Senior .NET Developer

NetImpact Strategies•Remote,

9h•$120,000 - $165,000•Remote

About The Position

NetImpact Strategies is seeking a Senior .NET Developer to support the development, modernization, and operation of a high-availability, enterprise-scale application in an AWS GovCloud environment. 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. The application uses a cloud-native microservices architecture with approximately a dozen services and processes millions of messages each month. Its 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 uses AI-assisted software development tools and AI development frameworks to accelerate engineering while maintaining rigorous standards for code quality, security, and maintainability. The successful candidate will 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 role includes occasional after-hours support for planned production releases and critical production incidents, coordinated with the operations team. US citizenship is required.

Requirements

Bachelor’s degree or equivalent experience in Computer Science, Engineering, Information Technology, or a related technical discipline.
At least 8 years of professional software development experience, including significant experience developing and supporting enterprise-scale production applications.
Expert-level hands-on development experience with C#, .NET Core, and modern .NET (.NET 8/9/10 or similar).
Strong experience designing and developing RESTful APIs and microservices-based architectures.
Experience developing and operating applications in AWS; AWS GovCloud is preferred.
Strong experience with Docker and Kubernetes in production environments.
Experience with Kubernetes management platforms such as Rancher.
Experience developing asynchronous, event-driven, or message-based applications using technologies such as RabbitMQ and AWS SQS.
Strong relational database development experience with PostgreSQL, including database design, query optimization, and performance troubleshooting.
Experience with AWS RDS or comparable managed relational database services.
Strong understanding of distributed systems, high-availability architectures, scalability, resiliency, and production application performance.
Experience supporting high-volume production systems and diagnosing complex issues across application, database, messaging, container, and infrastructure layers.
Demonstrated ability to take technical ownership of a substantial codebase and independently drive complex engineering efforts.
Experience performing code reviews and providing technical guidance and mentorship to other developers.
Experience with AI-assisted development and code-generation tools such as GitHub Copilot, ChatGPT, or comparable AI development technologies.
Ability to use AI tools effectively while applying engineering judgment to validate, secure, test, and maintain AI-generated code.
Experience with SonarQube or similar static code analysis and code-quality platforms.
Experience with Azure DevOps (ADO) repositories, source control, CI/CD pipelines, and modern DevSecOps practices.
Strong understanding of secure software development practices for enterprise and Federal environments.
Ability and willingness to provide occasional after-hours support for production releases and critical incidents.
US citizenship required.

Nice To Haves

Experience developing and supporting applications within AWS GovCloud.
Experience supporting high-volume, mission-critical Federal Government applications.
Experience integrating machine learning models or AI services into production application architectures.
Experience with AI agents, AI development frameworks, and advanced AI-assisted software engineering workflows.
Experience designing and troubleshooting distributed messaging architectures and asynchronous processing at scale.
Experience with application monitoring, logging, observability, and production performance management.
Experience with Infrastructure as Code and automated cloud deployment practices.
Familiarity with Federal security and compliance frameworks such as FISMA, NIST, and FedRAMP.
Experience working within Agile/Scrum and DevSecOps delivery environments.
AWS, Kubernetes, or related cloud/container certifications.

Responsibilities

Design, develop, maintain, and continuously improve a large-scale production application as a senior hands-on developer.
Take ownership of the application codebase and work 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, highly available services capable of processing millions of messages per month.
Develop and support event-driven and asynchronous processing solutions using 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.
Use 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 for compliance with 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 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 with operations and engineering teams to monitor and maintain production application health and availability.
Support production releases, deployments, troubleshooting, and incident resolution.
Provide 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.

Benefits

Comprehensive medical, dental, and vision insurance, starting the first of the month after joining.
401(k) plan with immediately vested employer contributions; no matching required.
Paid Time Off (PTO) policy.
One additional day of paid wellness leave per calendar year.
Ten federal holidays observed.
Pet insurance.
Tuition reimbursement.
Internal training programs.
Company-sponsored industry certifications.
Team-building activities, community volunteering, quarterly HQ days, wellness events, happy hours, and family fun events.