Senior Full-Stack Developer (.Net and React)

About Us
JustAnswer is the leading AI + Human professional services platform, on a mission to revolutionize how people access expert help. Since 2003, we’ve connected millions of customers across 196 countries with verified professionals in real time—anytime, anywhere. With a powerful combination of human expertise and cutting-edge AI, we’re transforming the future of professional services.

Rooted in boldness, humility, and innovation, we take a data-driven approach to solving complex problems and continuously improving through Lean principles.

About the Role

As a Senior Full-Stack Developer, you will play a key role in designing, developing, and maintaining high-traffic, customer-facing applications across international markets including the United Kingdom, Germany, Spain, France and Japan. You'll work across the stack with React, .NET Core, .NET 6 and C#, contributing to feature development and AI-driven enhancements. This position is critical to ensuring performance, scalability, and innovation across our International team, supporting 1M+ daily users and 2B+ monthly requests. You’ll collaborate closely with cross-functional partners to bring world-class experiences to life while contributing to our AI  strategy.

What You’ll Do

• Design, develop, and maintain scalable full-stack web applications using React, .NET Core, .NET 6+
• Collaborate with Product, UX, and Engineering to clarify business requirements and plan technical solutions
• Write clean, testable, and maintainable code with appropriate unit and integration tests
• Participate in peer code reviews and help mentor junior developers
• Support and improve CI/CD pipelines, monitor production systems, and ensure system performance and stability
• Participate in research and implementation of AI-generated content and LLM-based flows
• Continuously look for ways to improve deployment frequency, code quality, and overall team velocity

What We’re Looking For

• 5+ years of commercial experience in full-stack development
• Strong experience with .NET Core, C#, and React
• Experience with web services, REST APIs, and asynchronous backend architecture
• Hands-on experience with automated testing tools such as Jest/Vitest, Playwright and NUnit
• Experience working in an Agile environment with continuous integration and delivery
• Upper- Intermediate level of English or higher
• Proven ability to work independently, creatively solve problems, and collaborate effectively across teams
• Demonstrated curiosity for learning new technologies and contributing to a culture of innovation

Why Join Our Team
At JustAnswer, we blend the best of AI and human expertise to make a real impact. Our mission-driven culture values bold ideas, continuous learning, and global collaboration. We offer a flexible, remote-first environment with equitable rewards, career growth opportunities, and a supportive community where your contributions truly matter. Join us and be part of something bigger, helping people, one answer at a time. 

Our JustAnswer Promise
We strive together to make the world a better place, one answer at a time. JustAnswer's mission is to help people. We do this by connecting our members with verified Experts to help answer life's questions and solve problems. It’s not every day in your life that you get to be a part of a simple yet powerful mission. We pride ourselves in doing things the JA Way.
•    Data driven: Data decides, not egos
•    Courageous: We take risks and challenge the status quo
•    Innovative: We're constantly learning, creating, and adapting
•    Lean: We focus on customers, using lean testing to learn how to serve them best
•    Humble: Past success is not a guarantee of future success
If these things matter to you, come join the team here at JustAnswer!

Our Commitment to an Inclusive Workplace
We welcome people from all backgrounds who seek the opportunity to help build a future where professional services are readily available to all. If you have curiosity, passion, and a collaborative spirit, come work with us. JustAnswer is committed to an inclusive workplace. JustAnswer is an equal opportunity employer and does not discriminate on the basis of race, national origin, gender, gender identity, sexual orientation, disability, age, or other legally protected status.

AI Disclosure & Informed Consent
Artificial intelligence (AI) technology may be used during the hiring process to record, transcribe, analyze, and rank interview responses. By submitting your application and participating in the interview process, you acknowledge and consent to the use of AI technology in the hiring process. For more information see our AI Disclosure and Consent Policy.

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