Senior Software Engineer (.NET + React)

Why Tech9
At Tech9, we are driven by a clear vision—to empower organizations with AI-centered solutions that make them more adaptable, efficient, and future-ready. As a company at the forefront of innovation, we help our clients build exceptional software that not only meets today’s needs but anticipates tomorrow’s challenges.

Our partnerships speak volumes, with clients like Instructure, Young Living, Imagine Learning, Mars Corp., and many others trusting us to lead the way in software development. We are rapidly growing across our offices in the US, LATAM, and India, and we're creating an environment where talented individuals can thrive, collaborate, and have fun while building transformative solutions.

If you're excited by the opportunity to work in a fast-paced, innovative environment where scaling and building the future of software is key, we’d love to hear from you. Join us as we work together to redefine the world of software development!

We’re seeking a Senior Full-Stack Engineer with deep expertise in C# .NET and frontend web development to drive both maintenance and modernization initiatives across our client’s service management platform.

This role is essential in maintaining and enhancing existing systems while leading the effort to modernize the technology stack. You’ll work with legacy frontend frameworks (jQuery, KnockoutJS, Angular) and play a key role in transitioning to React. On the backend, you’ll apply your C# .NET Framework experience while introducing .NET Core best practices.

You’ll help ensure the platform remains stable, performant, and feature-rich while driving modernization initiatives that improve scalability, maintainability, and customer experience.

• Maintain and enhance existing applications using C# .NET, ASP.NET MVC, jQuery, KnockoutJS, and Angular.

• Design and implement modernization strategies to migrate legacy codebases to React and .NET Core.

• Build and optimize backend services and APIs using C# .NET Framework and .NET Core.

• Work with Entity Framework and NHibernate for ORM and data access.

• Develop and maintain integrations with third-party REST APIs.

• Build new features and maintain existing functionality across the full stack.

• Work with Microsoft Azure for deployment, hosting, and infrastructure management.

• Collaborate with Product, QA, and DevOps teams to deliver scalable, reliable solutions.

• Lead technical decision-making around architecture and modernization strategy.

• Leverage AI-powered development tools (GitHub Copilot, Cursor) to improve development speed and quality.

• Participate in code reviews and mentor team members on best practices.

• Support deployment processes and assist with production troubleshooting.

Backend

• C# .NET Framework (current)

• ASP.NET MVC

• Entity Framework / NHibernate

• C# .NET Core (modernization target)

• RESTful APIs and Web Services

• SQL Server

• Visual Studio / Visual Studio Code

• Git version control

Frontend

• jQuery, KnockoutJS, Angular (legacy maintenance)

• React (modernization target)

• JavaScript / TypeScript

• HTML5, CSS3

Cloud & Tools

• Microsoft Azure (hosting, deployment, services)

• Visual Studio 2022

• GitHub Copilot / Cursor (required)

• Git workflows and CI/CD pipelines

• Agile development methodologies

• 5+ years of professional software development experience.

• Strong expertise in C# .NET Framework and ASP.NET MVC with production experience.

• Experience with Entity Framework and/or NHibernate for data access.

• Solid frontend experience with jQuery, KnockoutJS, and/or Angular.

• Proven experience integrating with third-party REST APIs.

• Familiarity with Microsoft Azure and cloud services.

• Proven ability to maintain and modernize legacy codebases.

• Experience leading or contributing to modernization projects involving React or .NET Core.

• Active user of AI-powered tools (GitHub Copilot, Cursor, or similar).

• Excellent debugging and problem-solving skills.

• Strong communication and collaboration skills.

• Experience with Visual Studio and related .NET tools.

• Self-motivated with a strong sense of ownership and accountability.

• Hands-on experience with React and modern frontend frameworks.

• Proficiency with C# .NET Core and ASP.NET Core.

• Experience with AWS or other cloud platforms.

• Exposure to microservices architectures.

• Knowledge of TypeScript.

• Experience with automated testing frameworks.

• Background in SaaS platforms or service management systems.

• Understanding of API design, webhooks, and authentication patterns.

• Experience with database optimization and performance tuning.

The process is designed to be thoughtful, efficient, and focused on both technical ability and team fit.

1. 30-minute on-demand HireVue screening

   • Answer situational and behavioral questions to help us understand your ownership mindset, adaptability, and approach to collaboration.

2. 10-minute virtual Q&A session with our recruiter

   • This is not an interview — just a conversation to clarify the role and answer any questions you may have.

3. 60-minute live technical interview

   • Meet with a member of our engineering team to assess your full-stack technical skills and problem-solving approach.

4. 60- minute chat with the hiring manager

   • Test high level technical knowledge and discuss alignment with the role, team culture, and long-term goals.

5. 30- minute chat with the Project Manager 

   • Final discussion to discuss project and determine culture fit. 
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