Senior Full-Stack Engineer (EU)

We are looking for a highly experienced and technically strong Senior Full-Stack Engineer who can design, build, and scale high-performance, cloud-native systems across backend and frontend layers. You will own complex engineering initiatives end to end, from architectural design and implementation to deployment, monitoring, and long-term scalability. The focus of this role is building and evolving a large-scale, event-driven AdTech platform, ensuring performance, reliability, and sustainable technical growth. This is a high-impact senior position with strong influence over architectural decisions, engineering standards, and long-term platform direction.  Full-Time | Remote  |  CET time zone  Key Responsibilities Develop, test, and maintain high-quality backend and frontend code supporting core products and services. Collaborate closely with Product, Data, and Design teams to deliver reliable, scalable software solutions. Participate in the full software development lifecycle: planning, architecture, implementation, deployment, and monitoring. Write clean, maintainable, well-documented code aligned with engineering best practices. Proactively identify performance bottlenecks, conduct root-cause analysis, and deliver resilient, scalable improvements. Contribute to architectural decisions, define technical standards, and help shape the platforms long-term technical direction. Conduct thoughtful code reviews, share knowledge, and mentor junior engineers to maintain high quality standards.  Key Requirements Bachelors degree (or higher) in Computer Science, Engineering, or a related field. 5+ years of professional software development experience. Strong proficiency in C#, Java, or similar backend programming languages. Proficiency in TypeScript and Lit Experience building backend services and RESTful APIs. Solid understanding of relational and NoSQL databases (e.g., SQL Server, BigQuery, Bigtable). Experience with cloud platforms (Google Cloud, AWS, or Microsoft Azure). Familiarity with containerization and orchestration tools (Docker, Kubernetes). Strong problem-solving skills and passion for building scalable, high-quality systems. Excellent communication and collaboration skills. Fluent in English (written and spoken). Nice to Have Experience in digital advertising, AdTech, or performance marketing environments. Knowledge of modern frontend frameworks (React, Angular, Vue). Experience with microservices and event-driven architectures. Familiarity with CI/CD pipelines and automated testing frameworks. Exposure to LLM architectures or AI agents. Why Join Us Work in a fast-scaling, international, data-driven environment. Competitive compensation aligned with seniority and impact. Work with modern cloud and big data technologies in a performance-driven team. Tech Stack C# / .NET (backend services & APIs), TypeScript using Lit  (frontend applications), REST & GraphQL APIs, Google Cloud & Microsoft Azure (hybrid infrastructure), BigQuery (analytics warehouse), Bigtable (high-throughput event storage), Docker & Kubernetes (containerization & orchestration)