exmox GmbH is hiring a Senior Backend Engineer (f/m/x)

exmox GmbH is hiring a Senior Backend Engineer (f/m/x) to be instrumental in designing and scaling the systems that power our Ad-Tech platform. You will work alongside data scientists, product specialists, and frontend developers to drive measurable impact across millions of daily user interactions.

What You'll Do

• Architect and build high-scale backend systems to power real-time decision-making, ad delivery, and performance tracking.
• Design efficient APIs and services with low-latency and high reliability for internal teams and external partners (REST and GraphQL).
• 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.
• 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.

What We're Looking For

• 5+ years of backend engineering experience.
• At least 2+ years in a high-volume, data-rich environment.
• Strong Python expertise, with production experience in FastAPI, Flask, or similar frameworks.
• Deep understanding of API design and backend system integration.
• 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.
• 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.

Nice to Have

• Ad-Tech experience, such as with ad serving logic, tracking systems, fraud prevention, or real-time bidding.

Technical Stack

• Python, FastAPI, Flask, REST, GraphQL, Kafka, RabbitMQ, Docker, Kubernetes

Team & Environment

You will join a team of 51-200 employees, working directly alongside data scientists, product specialists, and frontend developers.

Benefits & Compensation

• 30 days of paid vacation.
• Public transportation tickets.
• Annual education budget of 1.500€.
• Annual workation opportunities.
• Gym membership via Wellpass (access to 7000+ Spas/Gyms in Germany).
• Monthly team lunches, daily fruits and vegetables, and beverages.
• Flexible working hours and working from home.
• Exclusive discounts for big brands & platforms via Corporate Benefits.
• Big socializing area for relaxing activities.

Work Mode

This is a hybrid position based in Hamburg, Germany.

exmox GmbH is an equal opportunity employer.