Senior Java Backend Developer (m/w/d)

🌍 About Adfinis

• At Adfinis, we’re not just another software company – we’re an Open Source powerhouse with a passion for clean, reliable, and scalable technology.
• With roots in Switzerland and teams across Germany, the Netherlands, Australia, and Egypt, we build solutions that empower organizations to move fast, stay secure, and scale sustainably.

As a Senior Java Backend Developer, you’ll play a key role in designing and building high-performance microservices that form the backbone of our clients’ infrastructure. You’ll work closely with global teams to deliver modern, cloud-native systems that make an impact — while staying true to our Open Source values.

Tasks

🚀 What You’ll Do

• Be a key member of the Backend Engineering Team, designing and maintaining scalable, high-performance Java microservices
• Develop and optimize RESTful APIs that connect front-end, data, and external systems via API Gateways
• Build cloud-native microservices deployed on AWS, Azure, or GCP environments
• Write clean, testable, and maintainable code following SOLID, DDD, and Clean Code principles
• Contribute to the architecture and design of distributed systems and domain models
• Collaborate closely with Frontend Developers, DevOps Engineers, and Product Owners in Agile/Scrum teams
• Participate in code reviews, pair programming, and drive continuous improvement initiatives
• Ensure system reliability, security, and observability using modern monitoring and logging practices
• Support CI/CD pipelines, containerization, and deployment automation with Docker and Kubernetes
• 💡 What We’re Looking For
• Build cloud-native microservices deployed on AWS, Azure, or GCP environments
• Write clean, testable, and maintainable code following SOLID, DDD, and Clean Code principles
• Contribute to the architecture and design of distributed systems and domain models
• Collaborate closely with Frontend Developers, DevOps Engineers, and Product Owners in Agile/Scrum teams
• Participate in code reviews, pair programming, and drive continuous improvement initiatives
• Ensure system reliability, security, and observability using modern monitoring and logging practices
• Support CI/CD pipelines, containerization, and deployment automation with Docker and Kubernetes
• 💡 What We’re Looking For

Requirements

• Bachelor’s degree in Computer Science, Software Engineering, or equivalent
• 5+ years of experience in Java/Spring backend development
• Strong knowledge of Java 17+, Spring Boot, Spring Security, Spring Cloud
• Deep understanding of OOP, Design Patterns, and Microservices Architecture
• Proven experience building REST APIs, SOAP Web Services, and writing clean, maintainable code
• Proficient with JPA/Hibernate, SQL, and NoSQL databases (PostgreSQL, MySQL, MongoDB, Redis)
• Familiar with cloud services and API Gateways (Spring Cloud Gateway, AWS Lambda, ECS, S3, Azure/GCP equivalents)
• Experience with event-driven systems and message brokers (Kafka, RabbitMQ)
• Solid understanding of Clean Architecture, testing (JUnit, Testcontainers), and automation
• Used to working in Agile environments with GitLab, Jira, and Confluence
• Knowledge of containerization and cloud deployments (Docker, Kubernetes, Helm)
• Passionate about performance optimization and robust software design
• Strong communicator with a solution-oriented mindset and focus on delivery excellence
• Experience with Keycloak, OAuth 2.0, or JWT authentication
• Familiarity with CI/CD tools (GitLab CI, Jenkins, ArgoCD)
• Hands-on with Reactive Programming (WebFlux, Reactor)
• Contributions to Open Source projects or mentoring experience in dev teams
• 🎁 Why You’ll Love Working Here
• Knowledge of containerization and cloud deployments (Docker, Kubernetes, Helm)
• Passionate about performance optimization and robust software design
• Strong communicator with a solution-oriented mindset and focus on delivery excellence
• Experience with Keycloak, OAuth 2.0, or JWT authentication
• Familiarity with CI/CD tools (GitLab CI, Jenkins, ArgoCD)
• Hands-on with Reactive Programming (WebFlux, Reactor)
• Contributions to Open Source projects or mentoring experience in dev teams
• 🎁 Why You’ll Love Working Here

🌟 Bonus Points

Benefits

• 🌐 Remote-First setup with flexibility and autonomy
• 🤝 Collaborate with international Open Source experts across time zones
• 🚀 Work on modern, cloud-native systems with cutting-edge technologies
• 💡 Continuous learning — certifications, conferences & mentoring included
• ❤️ A culture that celebrates team spirit, ownership, and engineering excellence
• 👉 Ready to Build What Matters?
• Join Adfinis LLC and bring your Java mastery to a team that’s shaping the future of Open Source infrastructure.
• If you thrive on clean code, collaboration, and crafting systems that just work — we can’t wait to meet you. 🚀

Adfinis LLC – Open Source. Open Minds.