Senior Backend Engineer (f/m/x)

Your mission

As a Senior Backend Engineer, you’ll be instrumental in designing and scaling the systems that power our Ad-Tech platform including high-throughput tracking pipelines. You'll work alongside data scientists, product specialists, and frontend developers to drive measurable impact across millions of daily user interactions.

• Architect and build high-scale backend systems to power real-time decision-making, ad delivery, and performance tracking.
• Design efficient APIs and services that serve internal teams and external partners with low-latency and high reliability REST and GraphQL included.
• Work on data-intensive components, including event processing, attribution tracking, and campaign performance monitoring.
• Ensure high performance under load, applying profiling, caching strategies, and horizontal scaling to keep systems fast and reliable.
• Integrate with third-party platforms, including MMPs, and analytics tools, using RESTful APIs
• Contribute to containerized deployments and observability using Docker, Kubernetes, and modern monitoring stacks.
• Mentor and guide engineers through complex technical challenges, architecture reviews, and clean, scalable design.
• Collaborate cross-functionally with product and data teams to deliver features that directly influence campaign effectiveness and advertiser ROI.

Your profile

• 5+ years of backend engineering experience, with at least 2+ in a high-volume, data-rich environment (Ad-Tech preferred).
• Strong Python expertise, with production experience in FastAPI, Flask, or similar frameworks.
• Deep understanding of API design and backend system integration. Familiarity with both REST and GraphQL.
• Experience with distributed systems, queues (e.g., Kafka, RabbitMQ), and event-driven architectures.
• Strong performance tuning and scaling skills, especially in latency-sensitive systems.
• Experience with Docker and Kubernetes, and a solid grasp of cloud infrastructure and container orchestration.
• Ad-Tech familiarity: Experience with ad serving logic, tracking systems, fraud prevention, or real-time bidding is a significant plus.
• Analytical mindset: You think in systems, solve problems holistically, and love optimizing for scale and efficiency.
• Strong communicator: Comfortable working across disciplines and articulating complex technical concepts in a business-aware context.

Why us?

• Work-Life Balance: 30 days of paid vacation.
• Commuter Benefits: Public transportation tickets provided.
• Professional Development: Annual education budget of €1,500.
• Workation Opportunities: Combine work and vacation annually.
• Wellness: Access to over 7,000 gyms and spas in Germany through Wellpass.
• Catering: Monthly team lunches, daily fruits, vegetables, and a variety of beverages.
• Flexibility: Flexible working hours and hybrid work model.
• Corporate Benefits: Exclusive discounts for major brands and platforms.
• Diversity: Join an international team with diverse cultural backgrounds.
• Fun and Games: Socializing area for relaxing activities during the workday.

Please note: this is not a remote only position, we offer you a flexible hybrid model here in Hamburg, Germany - working from home on Mondays & Fridays, coming to the office on Tuesday, Wednesday & Thursday!