Lead 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 Lead Full-Stack .NET Engineer in our Machine Learning department, you will take ownership of high-impact deliverables and collaborate with cross-functional stakeholders across various initiatives. In this role, you’ll support key business goals by designing, implementing, and managing A/B and multi-armed bandit (MAB) experiments that leverage AI and large language models (LLMs). You’ll drive innovation through R&D, deliver critical data insights, and play a key role in scaling AI/LLM capabilities across the organization through technical leadership and collaboration. Our environment embraces continuous integration and deployment (CI/CD) practices, and we're extensively leveraging Generative AI technologies to enhance our ecosystem. Join us in shaping the future of AI-driven solutions within an ecosystem of 170+ connected applications, supporting over a million visitors daily and handling billions of requests each month.

What You’ll Do

• Guiding the team in making well-informed technical decisions that enhance the quality and maintainability of our solutions.
• Collaborating with cross-functional teams to demonstrate how they can effectively leverage our infrastructure to meet their objectives.
• Designing and developing software architecture and technical frameworks for new applications in alignment with business goals and best practices.
• Identifying and implementing strategies to improve the stability, performance, and scalability of our applications and services.
• Responding promptly to production incidents, employing creative problem-solving skills to minimize downtime and mitigate potential issues.
• Mentoring and supporting team members, fostering a culture of continuous learning and technical excellence.
• Conducting code reviews and ensuring adherence to coding standards and best practices across the team.
• Participating in the evaluation and integration of new technologies, including AI and automation tools, to drive innovation and efficiency.

What We’re Looking For

• 6+ years of experience in full-stack development using C#, .NET Core, JavaScript, React and related technologies.
• SQL and database design skills, including experience with large databases (e.g., SQL Server, ElasticSearch).
• Solid understanding of architectural patterns including Service-Oriented Architecture (SOA).
• Hands-on experience with REST APIs, web services, and WCF.
• Expertise in using source control systems (e.g., Git) for managing codebases.
• Experience in developing automation tests (unit and integration) using Test-Driven Development (TDD) methodologies.
• Agile/SCRUM experience with a focus on CI/CD practices.
• Experience working with LLMs, including prompt engineering, leveraging coding assistants, and integrating with APIs such as OpenAI’s.
• Strong communication and collaboration skills, with the ability to explain complex technical concepts to non-technical stakeholders in a clear and concise manner, and equally adept at translating business requirements into optimal technical solutions for the development team.
• Demonstrated autonomy in decision-making, with adaptability in dynamic environments
• Experience conducting code reviews and providing mentorship to other developers.
• Ability to provide solid technical judgment and quickly resolve production issues.
• Enthusiasm for continuous learning and staying on the cutting edge of new technologies, frameworks, and tools.
• Proficiency in data analysis, and interpreting results to drive decision-making.
• Upper-intermediate English proficiency (B2 or higher).
• Experience with Python is a big plus.

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.