Principal Software Engineer - Full Stack Development

Job Summary :

We are looking for an experienced Full Stack .NET Developer with strong hands-on expertise in .NET/.NET Core, React.js, and Playwright. The candidate will be responsible for designing, developing, testing, debugging, and maintaining scalable web applications and APIs.

Key Responsibilities :

.NET / Backend Development :

• Design, develop, and maintain enterprise applications using C# and .NET/.NET Core.
• Develop scalable and secure ASP.NET Core Web APIs and RESTful services.
• Implement business logic, validation, exception handling, logging, and authentication/authorization.
• Work with Entity Framework Core, LINQ, dependency injection, middleware, and asynchronous programming.
• Design reusable, maintainable, and testable backend components.
• Optimize application performance, scalability, and reliability.
• Troubleshoot production issues and perform root-cause analysis.
• Integrate applications with internal and external systems through REST APIs and other integration mechanisms.
• Apply clean coding practices and appropriate design patterns.

React Front-End Development :

• Develop responsive and user-friendly web applications using React.js.
• Build reusable React components and modular front-end architecture.
• Work with JavaScript/TypeScript, HTML5, CSS3, and modern React concepts.
• Implement state management, routing, form validation, API integration, and error handling.
• Integrate React applications with .NET REST APIs.
• Optimize front-end performance and application responsiveness.
• Ensure cross-browser compatibility and responsive behavior.
• Participate in UI development, code reviews, debugging, and performance improvements.

Playwright / Test Automation :

• Develop and maintain automated UI and end-to-end test frameworks using Playwright.
• Create reliable automated test cases covering critical application workflows.
• Automate functional, regression, integration, and smoke testing.
• Write Playwright tests using JavaScript/TypeScript.
• Implement reusable test utilities, fixtures, page objects, and test data.
• Execute tests across multiple browsers and environments.
• Analyze test failures, identify defects, and work with developers to resolve issues.
• Integrate Playwright automation into CI/CD pipelines.
• Maintain test scripts as application functionality evolves.
• Improve automation coverage and reduce manual regression-testing effort.

API & Integration :

• Design and consume RESTful APIs.
• Work with JSON, HTTP/HTTPS, authentication, authorization, and API error handling.
• Perform API testing and integration validation.
• Integrate front-end applications with backend services.
• Work with third-party APIs and enterprise integrations.
• Understand API versioning, security, performance, and scalability considerations.

Database Skills :

• Work with relational databases such as SQL Server.
• Write complex SQL queries, joins, stored procedures, functions, and views.
• Perform database design, data validation, and query optimization.
• Work with Entity Framework Core/ORM technologies.
• Troubleshoot database-related application issues and performance bottlenecks.

Software Engineering Practices :

• Follow SOLID principles, clean code, object-oriented programming, and design patterns.
• Participate in Agile/Scrum ceremonies including sprint planning, daily stand-ups, backlog refinement, demos, and retrospectives.
• Perform peer code reviews and maintain coding standards.
• Write unit, integration, and end-to-end tests.
• Participate in technical design and architecture discussions.
• Create technical documentation and maintain application documentation.

CI/CD & DevOps Exposure :

• Work with CI/CD pipelines for application build, testing, and deployment.
• Integrate Playwright automated testing into deployment pipelines.
• Work with tools such as Git, Azure DevOps/GitHub, Jenkins, or similar CI/CD platforms.
• Understand build management, version control, branching strategies, and release processes.
• Troubleshoot build and deployment failures.
• Exposure to Docker and cloud platforms such as Azure or AWS is an advantage.

Security :

• Implement secure coding practices across frontend and backend applications.
• Work with authentication and authorization mechanisms such as JWT, OAuth 2.0, and role-based access control.
• Understand common web application vulnerabilities such as OWASP Top 10.
• Ensure secure handling of user input, APIs, credentials, and sensitive information.

Required Technical Skills :

Backend :

• C#, .NET / .NET Core, ASP.NET Core, Web API / REST API, Entity Framework Core, LINQ, Dependency Injection, Async/Await, Object-Oriented Programming, Design Patterns.

Frontend :

• React.js, JavaScript / TypeScript, HTML5, CSS3, React Hooks, REST API Integration, Responsive Web Development.

Automation :

• Playwright, End-to-End Testing, UI Automation, Regression Testing, Cross-Browser Testing, Page Object Model, Test Fixtures, CI/CD Test Integration.

Database :

• SQL Server, SQL, Stored Procedures, Query Optimization, Entity Framework.

Tools :

• Git, Azure DevOps / GitHub, Postman, Visual Studio / VS Code, CI/CD tools.

Preferred Skills :

• Azure or AWS, Docker, Microservices architecture, TypeScript, Redis or caching technologies, Messaging technologies, Kubernetes, Automated API testing, Performance testing, Agile/Scrum methodology.

Soft Skills :

• Strong analytical and problem-solving skills.
• Excellent verbal and written communication.
• Strong collaboration and stakeholder-management skills.
• Ability to understand business requirements and convert them into technical solutions.
• Strong debugging and troubleshooting capability.
• Attention to detail, particularly in automated testing and defect identification.
• Ability to work independently as well as within a cross-functional team.
• Strong ownership and accountability for deliverables.

Ideal Candidate Profile :

The ideal candidate should have a balanced full-stack development and test-automation mindset, with strong expertise in : C#/.NET ASP.NET Core React JavaScript/TypeScript REST APIs SQL Playwright. The candidate should be capable of developing features end-to-end - from backend API and database development through React UI implementation and Playwright-based automated testing - while following modern software engineering and Agile practices.