Lead FullStack Software Engineer with AI

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 of experience developing reliable, highly available, and scalable software systems
• Hands-on experience in system design
• Strong understanding of software architecture and design patterns
• Firm grasp of clean code principles and coding standards
• Strong proficiency in using AI tools such as ChatGPT, Codex, and Claude Code for rapid development
• Experience integrating AI tools into the development environment for streamlined usage
• Hands-on experience with AI context management, harness engineering, and prompt engineering
• Strong proficiency in backend development with C#(.NET 6+)/NodeJS/Python
• Strong proficiency in TypeScript
• Strong proficiency with SQL and NoSQL databases, including ORM knowledge and database partitioning and sharding techniques for scaling large databases
• Strong proficiency with distributed caching solutions, such as Redis, and advanced caching strategies
• Strong proficiency in frontend development using HTML, CSS, and JavaScript
• Strong proficiency with component-based frameworks and SSR, with Next.js/React as the primary frontend stack; candidates with Vue.js or Angular backgrounds should be willing to transition to Next.js/React
• Knowledge of modern cloud infrastructure and tools such as AWS, Terraform, and Docker
• Strong experience in API design and developing RESTful services
• Proficiency with version control systems such as Git
• Experience working within a formal CI/CD pipeline
• Experience with logging, monitoring, and alerting tools such as Datadog, New Relic, and Grafana
• Solid understanding of the testing pyramid, including unit, integration, and end-to-end testing
• At least an Upper-Intermediate level of English
• Mandatory timezone coverage: working hours must approximately align with the Toronto Eastern Time zone for LATAM-based candidates or 13:00–21:00 EET for EU-based candidates.