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Senior Full-stack Engineer (React+.Net) at JustAnswer. . Location: Ukraine. 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 work with cutting-edge technologies to build scalable, high-impact features that move our product forward. You’ll play a key role in maintaining and evolving our React frontend and .NET backend, while contributing to projects that integrate advanced machine learning models, including large language models (LLMs), to deliver personalized user experiences and innovative features. You'll be part of a small, collaborative team that values continuous improvement and embraces the latest in technology.. . What You’ll Do. . . Develop and maintain frontend components primarily using React, JavaScript, HTML, CSS, and Redux. . Build and enhance backend services with .NET, including writing and optimizing queries to interact with databases. . Integrate machine learning and large language models into existing workflows to enhance product capabilities. . Collaborate closely with team members, including QA and other developers, to ensure high-quality deliverables. . Participate actively in technical discussions and contribute ideas to improve the development process. . Support CI/CD pipeline management and contribute to building and maintaining Jenkins jobs. . Communicate clearly and effectively within the team and cross-functionally to align on project goals". . . What We’re Looking For. . . Minimum of 5 years of professional experience in full stack development. . . Proficiency in .NET frameworks, C#, and data access technologies.  . . Experience with React.js, including state management (Redux, Context API) and component-based architecture. . . Familiarity with Unit / Integration tests using any of Jest, NUnit, Playwright, React Testing Library. . . Strong knowledge of front-end technologies such as HTML5, CSS3, JavaScript, and TypeScript. . . Experience with database systems such as SQL Server or MySQL. . . Strong knowledge of design and architectural patterns, SOA design & web service development. . . Strong understanding of development processes. . . Experience or willingness to work with integration of machine learning or LLM-based services is a plus. . Upper-intermediate level of English. . . Excellent problem-solving and analytical skills, with a keen attention to detail. . . Strong communication and interpersonal skills, with the ability to work effectively in a team-oriented environment. . . Ability to manage multiple tasks and prioritize effectively in a fast-paced environment. . . Demonstrated leadership abilities, with a track record of mentoring and guiding junior developers. ". . 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. .. #LI-Remote