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
Supporting Technologies
AJAX Control Toolkit, UpdatePanel, ScriptManager
JavaScript, jQuery, jQuery UI, jQuery Validation
CSS/UI: Semantic UI, jQuery UI themes, custom styles
Reporting: ActiveReports / MESCIUS ActiveReports
Databases: Oracle, PostgreSQL
Messaging & Email: AWS SQS, SES
Modernization Stack (Migration Path)
.NET Core / .NET 6
ASP.NET Core
Primary
React Native
JavaScript / TypeScript
Related Technologies
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)
Bonus
React.js / Next.js
Primary
Selenium, Playwright
Testing Ecosystem
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: SonarQube
Required experience designing, deploying, and supporting cloud solutions using:
EC2, ECS, Lambda
S3, RDS, DMS
CloudFormation
Event-driven and scalable architectures
Experience leveraging AI-assisted tools and LLM integrations to improve development workflows.
Examples
AI code assistants (e.g., GitHub 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 DevOps 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 ActiveReports or similar reporting tools
AWS certifications
Containerization & orchestration (Docker, Kubernetes, ECS)
Infrastructure as Code (Terraform, CloudFormation)
Microservices & event-driven architectures
Security best practices & OWASP guidelines
CI/CD tooling (GitHub Actions, Jenkins)
Monitoring & logging (CloudWatch, 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 ConsultNet, 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 comprehensive service offerings cover a wide range of technology and engineering positions across key markets nationwide. Learn more at www.consultnet.com .
We champion equality and inclusivity, proudly supporting an Equal Opportunity Employer policy. We welcome applicants regardless of Race, Color, Religion, Sex, Sexual Orientation, Gender Identity, National Origin, Age, Genetic Information, Disability, Protected Veteran Status, or any other status protected by law.