Senior Software Engineer (.NET React)

Why Tech9
At Tech9 we are driven by a clear visionto 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 todays needs but anticipates tomorrows 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 were creating an environment where talented individuals can thrive collaborate and have fun while building transformative solutions.

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

About the Role

Were 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 clients service management platform.

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

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

Responsibilities

• Maintain and enhance existing applications using C# .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 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.

Tech Stack

Backend

• C# .NET Framework (current)

• 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

Ideal Candidate

• 5 years of professional software development experience.

• Strong expertise in C# .NET Framework and 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 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 tools.

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

Nice to Have

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

• Proficiency with C# .NET Core and 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.

Hiring Process

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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