Full Stack Developer

Position Overview

We are seeking an experienced Senior Full Stack Software Engineer to join our team. Looking for Local candidates only (Rockville, MD/Tysons, VA) on C2C or W2 with deep expertise in .NET Framework development (both backend and frontend), React Native mobile development, automated testing frameworks, and AWS cloud technologies. This role requires a versatile engineer who can maintain and enhance .Net applications while building modern mobile solutions.

Core Technical Requirements

.NET Full Stack Development (.NET Framework 4.7.2)

• Primary Backend: .NET Framework 4.7.2, C#, WCF Services,

• Primary Frontend:Web Forms,MVC, Razor

• Related Technologies:

o UI Frameworks:Web Forms (.aspx), Master Pages, User Controls (.ascx)

o AJAX: AJAX Control Toolkit, UpdatePanel, ScriptManager

o MVC:MVC 4.0/5.2.3, Razor view engine

o Client-Side: JavaScript, jQuery (1.7.2, 1.9.1, 3.2.1), jQuery UI, jQuery Validation

o CSS Frameworks: Semantic UI, jQuery UI themes, custom stylesheets

o Reporting: ActiveReports/MESCIUS ActiveReports (v10, v18)

o Web APIs: RESTful services, SOAP, WCF

o Databases: Oracle, PostgreSQL

o AWS Technology: AWS SQS & SES

o Modern Stack (for migration): .NET Core/.NET 6+,Core

Frontend Development (React Native)

• Primary: React Native, JavaScript/TypeScript, React

• Related Technologies:

o State Management: Redux, Redux Toolkit

o Navigation: React Navigation

o UI Components: React Native Paper, Native Base, React Native Elements

o Build Tools: Metro, Expo

o Mobile APIs: Camera, Geolocation, Push Notifications

o React Hooks & functional components

o Responsive design & cross-platform development (iOS/Android)

o Web: React.js, Next.js (bonus)

Testing & Quality Assurance

• Primary: Selenium, Playwright

• Related Technologies:

o Unit Testing: xUnit, NUnit, MSTest (for .NET), Jest, react-native-testing-library(for React/React Native)

o Integration Testing: Selenium, Appium, Playwright

o API Testing: Postman, SoapUI, Swagger

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

o Test Runners: TestNG, Cucumber

o Performance Testing: JMeter, Gatling

o Code Coverage: SonarQube

Cloud Technologies (AWS)

Required:

Experience designing, deploying, and maintaining applications on AWS cloud platform, including services such as EC2, ECS, S3, DMS, RDS, Lambda, CloudFormation

AI & LLM Technologies

• Primary: Experience leveraging AI-assisted development tools and Large Language Models for software engineering tasks

Related Technologies:

o AI-Powered Development: Amazon Q Developer, GitHub Copilot, Amazon CodeWhisperer, Tabnine, or similar AI code assistants

o Agentic AI: Experience with autonomous AI agents for development workflows

o AI Integration: REST APIs for LLM services, prompt engineering, context management

o AI Use Cases: Code generation, code review, documentation generation, test case creation, debugging assistance, refactoring support

Key Responsibilities

• Maintain and enhance existing .NET Framework 4.7.2 applications includingWeb Forms, Master Pages, User Controls, and WCF Services

• Develop and maintain complex web UIs usingWeb Forms, AJAX Control Toolkit, and jQuery

• Build and maintainMVC components with Razor views

• Develop cross-platform mobile applications for iOS and Android using React Native

• Create and maintain reporting solutions using ActiveReports

• Build and maintain RESTful APIs, SOAP services, and WCF services

• Design and implement AWS cloud solutions with high availability and scalability

• Implement comprehensive automated testing strategies including unit, integration, and end-to-end tests

• Write clean, maintainable, and well-documented code following best practices

• Collaborate with product managers, designers, and other engineers to deliver high-quality solutions

• Actively participate in conduct code reviews

• Optimize application performance, security, and scalability across legacy and modern platforms

• Participate in architecture and design decisions, including modernization strategies

• Troubleshoot and resolve complex technical issues in both frontend and backend environments

• Contribute to DevOps practices and CI/CD pipeline improvements

Required Qualifications

• 7+ years of professional software development experience

• 3+ years of hands-on experience with .NET Framework, includingWeb Forms and WCF Services

• Strong experience withWeb Forms UI development (.aspx, Master Pages, User Controls)

• Proficiency with JavaScript, jQuery, and AJAX technologies

• Experience withMVC and Razor view engine

• 3+ years of experience with React Native development

• 2+ years of experience with automated testing frameworks (Selenium, Playwright)

• 3+ years of experience with AWS cloud services

• Strong understanding of software design patterns and SOLID principles

• Experience with version control systems (Git/Bitbucket)

• Proficiency in SQL and database design

• Experience with Agile/Scrum methodologies

• Strong problem-solving and analytical skills

• Excellent communication and collaboration abilities

Preferred Qualifications

• Experience with AJAX Control Toolkit and advanced AJAX patterns

• Experience with ActiveReports or similar reporting frameworks

• Experience migrating legacy .NET Framework applications to .NET Core

• AWS certifications (AWS Solutions Architect, AWS Developer, or equivalent)

• Experience with containerization (Docker) and orchestration (Kubernetes, ECS)

• Experience with Infrastructure as Code tools (Terraform, CloudFormation)

• Familiarity with microservices and event-driven architecture

• Understanding of security best practices, OWASP guidelines, and AWS security

• Experience with CI/CD pipelines (Jenkins, GitHub Actions)

• Experience with monitoring and logging tools (AWS CloudWatch, Splunk)

• Knowledge of cost optimization strategies in AWS environments

• Contributions to open-source projects

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