Java Backend Engineer

We are looking for a Senior Java Backend Engineer to join our Engineering team in Berlin or remotely from Germany. In this role, you will design, build, and scale high-performance backend systems using modern Java technologies and cloud-native architectures.

You will work on complex systems where reliability, clean architecture, and strong engineering standards matter, helping Atolls build backend services that can support growth across markets and platforms., As a Senior Java Backend Engineer, you will:

• Design, develop, and maintain scalable backend services using Java 17 or other recent versions (11+).
• Build and evolve microservice-based and event-driven architectures
• Develop APIs using GraphQL
• Work with Spring Boot and Spring Reactive (WebFlux)
• Design and optimize data models using MySQL and NoSQL databases (DynamoDB or MongoDB)
• Ensure high performance, reliability, and scalability of backend systems
• Write clean, maintainable, and well-tested code
• Implement performance testing and end-to-end testing
• Collaborate closely with product managers, frontend engineers, and DevOps
• Contribute to architectural decisions and technical best practices
• Mentor junior engineers and provide technical leadership when needed
• Collaborate on AI-enabled features, including prompt engineering and backend integrations, 2. Technical Round: Focus on the technical aspects of the role (Through a Live Case), and meet your potential manager. 3. Final Round: Meet other Atollians ️ It varies from 1 to 3 interviews

*Some processes might slightly change according to needs

• 8+ years of professional experience in backend development
• Strong expertise in Java 17 or other recent versions (11+)
• Extensive experience with Spring Boot and Spring Reactive
• Solid knowledge of MySQL and experience with NoSQL databases (DynamoDB or MongoDB)
• Hands-on experience with Kubernetes
• Strong understanding of microservice architecture and event-driven systems
• Experience building and consuming GraphQL APIs
• Proven experience with performance optimization and testing
• Experience with end-to-end testing strategies
• Experience with prompt engineering for AI-powered applications
• Excellent understanding of software design and architectural patterns
• Ability to design elegant, scalable, and maintainable system architectures
• Strong communication skills and excellent English proficiency, * Cloud experience (AWS/GCP/Azure)
• Experience with CI/CD pipelines
• Experience building AI-integrated backend systems

At Atolls, we believe in nurturing both your professional and personal growth. Here’s what you can expect:

• A culture that values personal and professional development, with internal mobility opportunities.
• A supportive and open-minded team that embraces diverse perspectives and innovative ideas.
• 32 days of paid vacation plus your birthday off, giving you the time you need to recharge.
• A flexible hybrid working scheme to balance work and life.
• Access to a learning budget and internal training to help you grow in your role.
• Mental health coaching to support your well-being.
• Regular global and local get-togethers to celebrate successes and build connections.
• The possibility of taking a sabbatical after three years with the company.
• A cloud-based company setup, providing flexibility and collaboration opportunities no matter where you are.

Atolls is the world’s largest community-driven shopping platform, active in 20+ markets.

We help millions make smarter spending decisions across discovery, evaluation, and (re-)purchase by connecting people with the right brands and retailers.

Our 1,000+ team across 10 countries builds products used every day at global scale, where you’ll have real ownership and see your impact. Want to shape the destinations people rely on to shop with confidence? Keep reading.