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Tech Lead (.Net and React) at JustAnswer. Location Information: Ukraine. About the Role. As a . Lead Full-Stack Developer (Tech Lead). , you will take a hands-on leadership role in the design, development, and delivery of high-traffic, customer-facing applications across international markets including the United Kingdom, Germany, Spain, France, and Japan. In addition to building scalable solutions using React, .NET Core, .NET 6+, and C#, you will guide the technical direction of the team, mentor engineers, and ensure best practices in architecture, code quality, and deployment.. This is a high-impact role where you'll shape how we scale and evolve our international platform, which supports 1M+ daily users and processes over 2B monthly requests. You’ll work cross-functionally with Product, UX, and Engineering stakeholders and help drive our strategy around performance, scalability, and AI integration.. What You’ll Do. Lead the design and development of full-stack web applications using React and .NET technologies.. Act as a technical mentor and thought leader for a team of engineers, supporting growth and encouraging a culture of engineering excellence.. Collaborate with Product Managers, UX Designers, and cross-functional teams to translate business requirements into scalable technical solutions.. Set and maintain high standards for code quality, testing, and CI/CD practices.. Conduct code reviews, provide architectural guidance, and ensure alignment with best practices.. Monitor production systems, ensure high availability and performance, and proactively address technical debt.. Drive the implementation of AI-powered features and LLM-based flows, contributing to our innovation strategy.. Promote a DevOps mindset and lead continuous improvements in deployment frequency, development velocity, and system reliability.. What We’re Looking For. 7+ years of experience in commercial full-stack development, with at least 2+ years in a technical leadership or lead developer role.. Deep expertise in .NET Core, C#, and React.. Strong understanding of modern web architecture, microservices, REST APIs, and asynchronous programming.. Proficiency with automated testing frameworks such as Jest/Vitest, Playwright, and NUnit.. Experience guiding teams through Agile development processes and continuous integration/delivery.. Upper-Intermediate level of English or higher, with strong communication and collaboration skills.. A proactive, solution-oriented mindset with a passion for mentoring and enabling teams.. Curiosity and enthusiasm for AI technologies, with a desire to explore and implement AI-driven solutions.