Senior Backend Engineer, AdTech (m/f/d)

About the role:  As S enior Backend Engineer, AdTech (m/f/d) , you will be shaping and evolving our AdTech platform and operating backend services that power advertising products across sponsored search, sponsored products, campaign management, ad serving, targeting, reporting, and measurement with a strong focus on scalable architecture, engineering best practices, and performance optimization. You will serve as the technical leader across cross-functional teams and ensure the successful delivery of high-performance advertising solutions. You will collaborate closely with theProduct Managers, Retail Media business team and other stakeholders to turn complex business challenges into robust technical solutions that enable our Retail Media ecosystem to grow and scale. About our tech stack:  Node.js, TypeScript, Koa.js (primary) + NestJS, MongoDB (incl. aggregation pipelines), Redis, BullMQ, RabbitMQ, Algolia, Docker, Kubernetes (GKE), CI/CD (CircleCI + ArgoCD), Google Cloud. Integrations with ad-serving platforms. React/Next.js on the frontend.