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About the Role

We are looking for a Senior Java Backend Engineer to join our growing engineering team in Berlin or working remotely from Germany. You will play a key role in designing, building, and scaling high-performance backend systems using modern Java technologies and cloud-native architectures. This role is ideal for someone who enjoys working on complex systems, cares deeply about code quality and has a strong architectural mindset.

Responsibilities

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.

Requirements

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.
Experience with Python or strong willingness to learn Python.
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.

Skills

Java 17
Java 11+
Spring Boot
Spring Reactive
WebFlux
GraphQL
MySQL
NoSQL databases
DynamoDB
MongoDB
Kubernetes
Microservice architecture
Event-driven systems
Performance optimization
Performance testing
End-to-end testing
Prompt engineering
Python
Software design
Architectural patterns
AWS
GCP
Azure
CI/CD pipelines
AI-integrated backend systems

Location

Berlin
Remote (Germany)

Work Type

Hybrid
Remote

Experience Level

Senior
8+ years of professional experience

Benefits

Culture that values personal and professional development, with internal mobility opportunities.
Supportive and open-minded team that embraces diverse perspectives and innovative ideas.
32 days of paid vacation plus your birthday off.
Flexible hybrid working scheme.
Access to a learning budget and internal training.
Mental health coaching.
Regular global and local get-togethers.
Possibility of taking a sabbatical after three years with the company.
Cloud-based company setup.

About the Company

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?

Equal Opportunity

Our employment opportunities are open to every gender, race, religion, age, sexual orientation, ability, place of origin, or socioeconomic status.
We remain committed to a culture of diversity, equity and belonging, where all employees are welcomed, respected, connected, and engaged.