Senior Fullstack Engineer

We are looking for a Senior Full-Stack Engineer to join our team, Our customer is the European online car market with over 30 million monthly users, with a market presence in 18 countries. As a Senior Fullstack Engineer, you will play a pivotal role in shaping the future of online car markets and enhancing the user experience for millions of car buyers and sellers. Responsibilities: • Design and develop full-stack cloud solutions from technical analysis to integration testing. • Support existing systems • Mentor junior engineers on design patterns, code reviews, testing practices, and scalable architecture. • Establish documentation standards across teams. • Conduct root cause analysis and collaborate with production support to resolve issues. • Evaluate third-party software with business and engineering teams. • Maintain CI/CD pipelines for applications. Requirements: • Canadian timezone work hours (EDT) • 4+ years of experience with C# or .NET  for web application development • 4+ years of experience with React for web application development • Experience with Azure, including migration from Azure to AWS • Expert proficiency in GenAI-driven development, GitHub Copilot/Codex integration, rapid prototyping, automated refactoring, and AI-accelerated debugging • Deep understanding of AI agents, autonomous task orchestration, reasoning engines, tool-use integration, and multi-step workflow automation • Mastery of iterative prompting. Chain-of-Thought (CoT), Few-Shot prompting, output validation, and prompt optimization for production-grade code • Familiarity with Kafka, SQL, and performance optimization • Strong understanding of event-driven and microservices architecture • Experience, Application Insights, and responsive front-end design using React • Background in high-traffic websites, performance tuning, and security • Ability to communicate technical solutions effectively • Expertise in unit, component, and integration testing • Experience with Azure DevOps, and JIRA in distributed teams • Solid grasp of agile methodologies, including ScrumBan/Kanban and Gitflow Nice to Have: • Previous DevOps Experience is a great advantage • Experience with Java and Scala • Experience with observability tools like Datadog • Proficiency with  Java/Spring Boot for building APIs and web applications - nice to have • Experience with AWS • Previous experience with GitHub This job opportunity for Canadian time zone.