Senior Java Backend Developer (mwd)
First seen by Alion on Oct 30, 2026.
About Adfinis
At Adfinis were not just another software company were 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 youll play a key role in designing and building high-performance microservices that form the backbone of our clients infrastructure. Youll work closely with global teams to deliver modern cloud-native systems that make an impact while staying true to our Open Source values.
TasksWhat Youll 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 Were Looking For
Bachelors 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
Bonus Points
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 Youll Love Working Here
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 thats shaping the future of Open Source infrastructure.
If you thrive on clean code collaboration and crafting systems that just work we cant wait to meet you.
Adfinis LLC Open Source. Open Minds.