Senior Full Stack .NET Engineer
About the Role
As a Senior Full-Stack Developer, you will join a mission-critical initiative to build an AI-powered subscription platform for solo professionals (Fount.com). Fount is an independent product unit partially supported by JustAnswer, and you’ll join its core delivery team. We’re developing a category-defining toolset that helps experts get leads, manage communications, and grow their businesses — all enhanced by intelligent AI assistants.
You’ll work across the full stack (.NET Core/C# + React.js), helping build new features like an auction system for lead bidding, expert/customer chats, contracts, and billing tools. Much of the work is greenfield (from the scratch), and you’ll play a key role in defining scalable architecture and shipping impactful features.
What You’ll Do
- Design, develop, and maintain full-stack applications, backend logic modules, and front-end experiences using React.js and .NET Core.
- Collaborate with Product, UX, and Engineering stakeholders to clarify requirements and contribute to technical planning and documentation.
- Conduct code and design reviews, provide architectural input, and mentor junior developers on best practices.
- Write and maintain automated unit and integration tests using tools such as Jest, NUnit, or Playwright.
- Monitor and support production systems, resolve bugs, run performance audits, and ensure system stability.
- Contribute to the implementation of AI-driven features, including prompt-based workflows, RAG pipelines, and personalized assistant flows.
- Continuously improve code quality, team velocity, and system reliability through thoughtful technical decisions and rapid iteration.
What We’re Looking For
- 5+ years of commercial experience in full-stack software development.
- Strong proficiency in .NET Core, C#, and React.js (or deep experience in another modern frontend framework and readiness to learn React).
- Experience building and consuming REST APIs, and working with asynchronous backend services.
- Familiarity with modern automated testing frameworks (Jest, NUnit, Playwright, etc.).
- Comfortable working in a CI/CD environment with agile delivery cycles.
- Basic database knowledge and familiarity with performance and scalability considerations.
- Proven ability to work independently, own projects end-to-end, and make architectural tradeoffs.
- Upper-Intermediate English or higher for effective communication with international stakeholders.
- Curiosity and interest in AI-powered applications and emerging technologies.
Perks and Benefits
- Time off throughout the year (paid and unpaid)
- Professional development support and encouragement
- Resources to help improve your overall well-being
- Free membership to dive into JA product