Fullstack .NET Developer

Title
:
Fullstack .NET Developer
Location :
Rockville, MD or McLean, VA
Target Start Date : ASAP
Type
: contract
Pay
Rate: DOE

We are seeking a Senior Full Stack Software Engineer to support and modernize a critical enterprise platform. This role blends legacy .NET application stewardship, modern mobile development, and cloud-native architecture.

The ideal candidate is a versatile engineer who can maintain and enhance existing .NET Framework applications while building modern mobile and cloud solutions and contributing to long-term modernization initiatives.

Backend

• .NET Framework 4.7.2, C#

• WCF Services, SOAP & REST APIs

• ASP.NET

Frontend

• ASP.NET Web Forms (.aspx), Master Pages, User Controls

• ASP.NET MVC (4.0–5.2.3), Razor

• AJAX Control Toolkit, Update Panel, Script Manager

• JavaScript, jQuery, jQuery UI, jQuery Validation

• CSS/UI:
  Semantic UI, jQuery UI themes, custom styles

• Reporting:
  Active Reports / MESCIUS Active Reports

• Databases:
  Oracle, PostgreSQL

• Messaging & Email: AWS SQS, SES

• .NET Core / .NET 6

• ASP.NET Core

Primary

• React Native

• JavaScript / Type Script

• Redux / Redux Toolkit

• React Navigation

• UI Libraries:
  React Native Paper, Native Base, React Native Elements

• Metro, Expo

• Mobile APIs (camera, geolocation, push notifications)

• Responsive cross-platform design (iOS & Android)

• React.js / Next.js

Primary

• Selenium, Playwright

• Unit: xUnit, NUnit, MSTest, Jest

• Integration/E2E:
  Selenium, Appium, Playwright

• API Testing:
  Postman, SoapUI, Swagger

• Mocking: NSubstitute, Mock Service Worker, axios-mock-adapter

• Performance: JMeter, Gatling

• Code Quality & Coverage:
  Sonar Qube

Required experience designing, deploying, and supporting cloud solutions using:

• EC2, ECS, Lambda

• S3, RDS, DMS

• Cloud Formation

• Event-driven and scalable architectures

Experience leveraging AI-assisted tools and LLM integrations to improve development workflows.

Examples

• AI code assistants (e.g., Git Hub Copilot, Amazon Q Developer)

• Prompt engineering & API integrations

• Automated documentation, testing, and refactoring support

• Agentic AI or workflow automation (preferred)

• Maintain and enhance legacy .NET Framework applications and web interfaces.

• Develop and support ASP.NET Web Forms and MVC UI components.

• Build cross-platform mobile applications using React Native.

• Design and maintain REST, SOAP, and WCF services.

• Develop and maintain reporting solutions.

• Design scalable and resilient AWS-based solutions.

• Implement automated testing across unit, integration, and E2E levels.

• Optimize application performance, security, and reliability.

• Collaborate with product, design, and engineering teams to deliver solutions.

• Participate in code reviews and engineering best practices.

• Contribute to architecture decisions and modernization strategy.

• Troubleshoot complex cross-stack technical issues.

• Improve CI/CD pipelines and Dev Ops practices.

• 7 years of professional software development experience

• Strong experience with .NET Framework & ASP.NET Web Forms

• Experience building MVC applications with Razor

• Proficiency in JavaScript, jQuery, and AJAX

• 3 years of React Native development experience

• Experience with automated testing frameworks

• 3 years of AWS cloud experience

• Strong understanding of software design patterns & SOLID principles

• Experience with Git-based version control

• Strong SQL and database design experience

• Experience working in Agile environments

• Excellent problem-solving and communication skills

• Experience modernizing legacy .NET Framework applications

• Experience with Active Reports or similar reporting tools

• AWS certifications

• Containerization & orchestration (Docker, Kubernetes, ECS)

• Infrastructure as Code (Terraform, Cloud Formation)

• Microservices & event-driven architectures

• Security best practices & OWASP guidelines

• CI/CD tooling (Git Hub Actions, Jenkins)

• Monitoring & logging (Cloud Watch, Splunk)

• AWS cost optimization practices

• Open-source contributions

• Bachelor's degree in Computer Science or related field (or equivalent experience)

• Stabilizes and enhances legacy systems while enabling modernization.

• Delivers high-quality mobile and cloud-native capabilities.

• Improves performance, scalability, and reliability.

• Helps drive evolution toward modern architecture and engineering practices.

Welcome to Consult Net, a premier national provider of technology talent and solutions. Our expertise spans across project services, contract-to-hire, direct search, and managed services onshore, nearshore, and hybrid. For over 25 years, we have connected thousands of consultants with meaningful roles through a personal, communication-driven approach, partnering with a diverse client base to build high-performing teams and create lasting impact.

Our…