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Unisys

Full Stack Dotnet Developer/ React Developer

Hybrid

Rockville, United states

Senior

Freelance

24-02-2026

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Skills

Communication JavaScript C# TypeScript CSS SQL PostgreSQL GitHub CI/CD DevOps Version Control Test Quality Assurance Selenium Performance Testing Scrum Problem-solving Architecture Databases git jquery Analytical Skills Asp.Net react AWS Software Development api testing Postman Agile AWS Cloud JavaScript/TypeScript .NET AJAX Next.js React.js Redux Large Language Models Android Redux Toolkit

Job Specifications

We are seeking an experienced Senior Full Stack Software Engineer to join our team. The ideal candidate will have 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,ASP.NET

Primary Frontend: ASP.NET Web Forms, ASP.NETMVC, Razor

Related Technologies:

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

AJAX: AJAX Control Toolkit, UpdatePanel, ScriptManager

MVC:ASP.NETMVC 4.0/5.2.3, Razor view engine

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

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

Reporting: ActiveReports/MESCIUS ActiveReports (v10, v18)

Web APIs: RESTful services, SOAP, WCF

Databases: Oracle, PostgreSQL

AWS Technology: AWS SQS & SES

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

Frontend Development (React Native)

Primary: React Native, JavaScript/TypeScript, React

Related Technologies:

State Management: Redux, Redux Toolkit

Navigation: React Navigation

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

Build Tools: Metro, Expo

Mobile APIs: Camera, Geolocation, Push Notifications

React Hooks & functional components

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

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

Testing & Quality Assurance

Primary: Selenium, Playwright

Related Technologies:

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

Integration Testing: Selenium, Appium, Playwright

API Testing: Postman, SoapUI, Swagger

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

Test Runners: TestNG, Cucumber

Performance Testing: JMeter, Gatling

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:

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

Agentic AI: Experience with autonomous AI agents for development workflows

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

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 including ASP.NET Web Forms, Master Pages, User Controls, and WCF Services

Develop and maintain complex web UIs using ASP.NET Web Forms, AJAX Control Toolkit, and jQuery

Build and maintain ASP.NET MVC 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, including ASP.NETWeb Forms and WCF Services

Strong experience with ASP.NETWeb Forms UI development (.aspx, Master Pages, User Controls)

Proficiency with JavaScript, jQuery, and AJAX technologies

Experience with ASP.NETMVC 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 col

About the Company

We are a global technology solutions company that powers breakthroughs for the world’s leading organizations. These solutions — digital workplace, cloud, applications & infrastructure, enterprise computing and business process solutions — help people overcome obstacles and not only reach their greatest potential but go beyond it. For more information about how we deliver for our clients, visit https://www.unisys.com/. Know more