Lead Full Stack Engineer

Join Expereo as a Lead Full Stack Engineer in our new Digital Office. You will play a critical role in accelerating our transformation through the Single-Threaded Owner (STO) model. You will design and build modern front-end and back-end applications, mentor engineers, shape engineering best practices, and contribute to a programmable, automated digital platform. This role is ideal for engineers who thrive in high-impact, cross-functional environments and enjoy building elegant user experiences backed by robust, scalable distributed systems.

• Concevoir et construire des applications modernes front-end et back-end, mentorat des ingénieurs, et contribuer à une plateforme numérique programmable.
• Diriger la conception et la maintenance d'applications front-end évolutives (React, Vue, Angular) et de services back-end (Node.js, Python).
• Assurer que les applications respectent les normes les plus élevées en matière de performance, de sécurité, d'accessibilité et de fiabilité.

• Experience leading technical decision-making and mentoring experienced engineers
• You treat the product as your own and prioritize long-term stability over short-term "hacks"
• Experience building and consuming REST, GraphQL, streaming/event-driven APIs, and microservices
• Strong understanding of automated testing (Jest, Cypress, Playwright)
• Exposure to agentic AI, data-driven UI architectures, or AI-powered developer tools (Cursor, Claude Code, Copilot)
• Experience with cloud environments (AWS, Azure, or GCP)
• Familiarity with programmable networks, observability tooling, or network automation concepts
• Expertise in modern front-end frameworks (React, Vue, or Angular)
• You are eager to work across the full stack and stay curious about the evolving tech landscape
• Solid grounding in accessibility (WCAG), security best practices, observability, and performance tuning
• Familiarity with modern build tools (Vite, Webpack, Babel) and CI/CD pipelines (GitHub Actions, GitLab, Azure DevOps, etc.)
• Code-first and automation-first approach to solving problems
• Experience with CSS frameworks (Tailwind, Bulma, MUI, Chakra)
• Knowledge of component-based architecture, state-management patterns (Redux, Zustand, Vuex, etc.)
• Understanding of advanced security practices (CSP, threat modeling, RBAC patterns, dependency scanning)
• Experience in distributed systems or event-driven architectures
• Experience with design systems, component libraries, or Storybook
• Experience working with Salesforce
• Strong proficiency with JavaScript & TypeScript and back-end languages (.NET must, Node.js or Python preferred)