Senior Full-Stack Developer (.Net and React)

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

About Us

We are a San Francisco based company founded in 2003. Our mission is simple: we help people. We have democratized professional services by connecting customers with verified and vetted Experts who provide reliable answers at any hour and on any budget. JustAnswer members enjoy round-the-clock access to 12,000+ doctors, lawyers, tech support, mechanics, vets, home repair pros, and more. In the last 20 years, we have helped 22 million customers in 196 countries by answering more than 25 million questions. 

Why Join the Team

With 1,000+ employees, we are growing at an amazing pace. Our hiring criteria: Smart. Fun. Get things done. We love what we do and celebrate our success together, best of all, you get to work at a hot company that’s (drum roll, please) profitable! 

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!

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

Work Environment

JustAnswer UA has adopted a remote-first work environment from all UA regions. Some teams do occasionally have the option to meet in-person for teaming, collaboration, or social events. Our philosophy as a business is to put people’s safety and wellbeing first. In response to Covid-19, JustAnswer UA practices 100% virtual recruiting and onboarding processes.                                                                                                                                                                          

Our Commitment to Diversity  

At JustAnswer, we embrace workplace diversity. We believe that diversity drives richer insights, fuels innovation, and creates better outcomes. We are committed to attracting and developing an engaged and inclusive workforce. Team members from diverse backgrounds and unique perspectives are crucial to the JustAnswer mission of helping all people. Individuals seeking career opportunities at JustAnswer are considered without regard to race, color, religion, national origin, age, sex, marital status, ancestry, physical or mental disability, veteran status, sexual orientation, gender identity, or any other protected status under all applicable laws, regulations, and ordinances. 

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