Hybrid Senior Java Backend Developer

at eClear | borderfree

• Job title: Senior Java Backend Developer
• Job type: Full Time
• Experience level: Senior
• Salary: Not specified
• Degree requirement: Bachelor's Degree
• Tech skills: AWS, Cloud, Docker, Java, Kafka, Kubernetes, Microservices, Postgres, RabbitMQ, Spring, Spring Boot, SpringBoot
• Location requirements: Hybrid, Berlin, Germany

About the role

• Senior Java Backend Developer at eClear developing scalable backend services with a focus on performance. Engaging in innovative technologies like AI-Agents and collaborating with product teams in Berlin.

Responsibilities

• You develop scalable, distributed backend services with a focus on performance, quality and extensibility
• You take ownership of the entire development lifecycle: from design through implementation, testing and documentation to production operation
• You analyze and resolve root causes of defects quickly, thoroughly and sustainably
• You work closely with the interdisciplinary product team — having direct influence on functionality and user experience
• You actively shape our tech and team culture through code reviews, knowledge sharing, refactorings and suggestions for improved processes
• You design and implement AI agents using LLMs, planning algorithms and decision frameworks
• You develop architectures that enable autonomy, interactivity and goal-oriented task execution
• You integrate AI agents into existing applications, APIs or workflows — e.g. as chatbots, copilots or automation tools

Requirements

• A degree in Computer Science, Business Informatics or a comparable qualification
• At least 5 years of experience developing modern Java backends with Java 17/21, Spring Boot (3.x) and microservices architectures
• Deep knowledge of reactive programming with Spring WebFlux & Project Reactor
• Practical experience with cloud services (AWS) such as ECS, Lambda, RDS, SQS and experience with Kubernetes
• Proficient with PostgreSQL and performance optimization for high-traffic systems
• Experience with event-driven architectures (Kafka, RabbitMQ, SNS/SQS) and API-first designs (OpenAPI/Swagger)
• Routine use of Docker, CI/CD pipelines (GitLab, ArgoCD) and a modern DevOps toolchain
• Passion for clean, maintainable code — ideally with experience in TDD, DDD or hexagonal architecture
• Understanding of agent-based modelling, multi-agent systems or reinforcement learning
• Experience working with LLMs or generative AI models in real-world applications
• Independent and structured working style in experimental, dynamic environments
• A team-oriented, solution-focused attitude — you enjoy collaborating on challenging goals

Benefits

• Trust and responsibility: you shape — we give you the space to do it
• Hybrid working with flexible models and clear structures
• An agile, professional team with a genuine hands-on mentality
• Flat hierarchies, short decision paths and an office with a feel-good atmosphere in the heart of Berlin
• A company culture that combines humanity and excellence — technology with values