Summary: As a Lead FullStack Engineer, you will be pivotal in shaping the future of online car markets and enhancing user experience, developing fast, high-traffic public-facing websites, and exploring new technologies. Highlights: 1. Pivotal role in shaping the future of online car markets 2. Enhancing user experience for millions of car buyers and sellers 3. Explore new technologies and apply AI tools to SDLC **About the client:** Our customer is the European online car market, with over 30 million monthly users and a presence in 18 countries. As a Lead 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:** * Developing fast, high\-traffic public\-facing websites * Explore new technologies and help the team to use them * Work using AI tools and apply them to the SDLC * Following software development best practices while delivering the work * Following testing principles while testing your own code to ensure production readiness * Follow the philosophy of: you\-build\-it\-you\-run\-it (be responsible for the SDLC processes) **Requirements:** * **5\+ years** developing reliable, highly available, and scalable software systems * Strong understanding of software architecture and design patterns * Firm grasp of clean code principles and coding standards * **Strong proficiency using AI tooling**, such as ChatGPT/Codex, for rapid development * **Experience integrating AI tooling into your development environment for streamlined usage** * Experience with AI Frameworks like Vercel AI SDK, LangChain, etc. * Strong proficiency with backend development with either of the following technologies **Typescript \+Node.js** or **C\#\+Typescript** * Strong proficiency with SQL \& NoSQL datastores (GraphQL, Redis) * Strong proficiency with frontend development (HTML, CSS, JavaScript) * Strong proficiency with component\-based frameworks and SSR (Next.js/React or Vue.js) or Angular with the desire to learn React/ Vue.js. * Hands\-on experience developing and maintaining 3rd party content management systems * Knowledge of modern cloud infrastructures and tools, such as AWS, Terraform, and Docker * Experience with APIs and developing in a service\-based application environment * Experience building optimized UIs for performance * Proficiency with version control systems such as Git * Experience working within a formal CI/CD pipeline * Experience with logging, monitoring, and alerting services like Datadog, Newrelic * Solid approach to testing and ensuring quality of code, Unit testing, backend, and frontend * **At least Upper\-intermediate English level** * This role requires mandatory timezone coverage: work must align with the Toronto (ET) timezone for LATAM hours and **13:00–21:00 EET** for EU hours approximately. **We offer\*:** * Flexible working format \- remote, office\-based or flexible * A competitive salary and good compensation package * Personalized career growth * Professional development tools (mentorship program, tech talks and trainings, centers of excellence, and more) * Active tech communities with regular knowledge sharing * Education reimbursement * Memorable anniversary presents * Corporate events and team buildings * Other location\-specific benefits * not applicable for freelancers