Senior Backend Engineer (Java)

We are a digital advertising partner for offline businesses - we support retailers in their marketing activities and help them find a new audience. Would you like to join and be a part of digitalisation of retail?

Bonial is part of Axel Springer SE and is disrupting the retail landscape as the leading "Drive to Store" partner in Germany and France. Through our platforms "kaufDA" and "MeinProspekt" in Germany, and “Bonial” in France, we connect millions of users with their favorite shops and brands—driving real impact every single day.
We are in the midst of an exciting growth phase, scaling fast and transforming the way people discover retail. At Bonial, we thrive in a high-performance, fast-paced environment fueled by motivated, results-driven individuals who are passionate about making a difference. If you’re looking to be part of a dynamic team that’s shaping the future of retail, we’d love to meet you.

bonial welcomes both full- and part-timers!

Are you passionate about building scalable backend systems that power high-traffic applications? Do you enjoy taking ownership and working closely with product managers and frontend teams to deliver impactful features?

If you care about clean architecture, system reliability, and modern cloud technologies, we’d love to hear from you!

As a Senior Backend Engineer, you will play a key role in designing, building, and scaling the backend systems that power our products. You will take ownership of backend components within your domain team and collaborate closely with mobile engineers (Android & iOS), product managers, and other stakeholders to deliver high-quality user experiences. You’ll work on systems used by millions of users, ensuring performance, scalability, and reliability in a fast-paced, agile environment.

● Design, develop, and maintain scalable backend services using Java and modern frameworks.

● Build and evolve RESTful APIs and ensure consistency, compatibility, and high performance across services.

● Architect and operate systems on AWS, leveraging cloud-native services where appropriate.

● Take ownership of production systems, including deployment, monitoring, and incident handling.

● Contribute to the development of high-traffic, real-time, geo-located applications.

● Ensure backend systems meet high standards of scalability, maintainability, and security.

● Collaborate closely with frontend and mobile teams to deliver seamless end-to-end features.

● Improve and unify APIs and backend components across domains.

● Work with technologies such as AWS, PostgreSQL, and Elasticsearch.

● Contribute to Agile ways of working (Scrum, Kanban).

● Strong professional experience in backend development with Java.

● Strong expertise in Java (21+) and Spring Boot .

● Hands-on experience with AWS and cloud-native architectures.

● Experience designing Restful APIs , operating distributed systems and microservices architectures .

● Solid understanding of inter-service communication , fault tolerance, and system resilience.

● Experience with Docker and Kubernetes .

● Familiarity with CI/CD pipelines and modern DevOps practices.

● Experience with PostgreSQL and Elasticsearch .

● Experience with observability tooling (logs, metrics, tracing — e.g., OpenSearch, Grafana, Prometheus).

● Strong understanding of scalable system design and clean architecture .

● Strong testing discipline , including unit, integration, and contract testing.

● Ability to take ownership and make informed technical decisions.

● Comfortable making decisions with incomplete information and navigating trade-offs in production systems.

● Strong communication skills with the ability to clearly express ideas and trade-offs.

● Experience working in cross-functional, agile teams .

● Fluent in English (German not required).

● Self-driven, reliable, and detail-oriented.

● Team player with a proactive, solution-oriented mindset.

● Experience with high-traffic or real-time systems .

● Experience with Infrastructure as Code (e.g., Terraform).

● Enjoyment of tackling complex technical challenges.