Senior Java Developer (f/m/d)

Job Description

Are you interested in joining of Europe's fastest growing companies? Do you want to impact the wellbeing of millions of users?
If yes, join us to make an impact in a fast-paced and dynamic environment where you’ll play a key role in driving financial accountability, supporting strategic decisions, and enabling sustainable growth.

Epassi’s purpose is to boost everyday well-being. We are a leading provider of employee benefit solutions across Europe. We were established in Finland in 2007, and in 2008 we were the first company to launch a mobile-payable employee benefit payment solution in Europe. Since then, we have consistently grown, diversifying our products and introducing our services into new markets.
Epassi has been awarded by the Financial Times as one of the fastest-growing companies in Europe on multiple occasions.

We are currently hiring a Senior Java Engineer to be based in Germany.

Your mission at Epassi

You will be part of a cross-functional product team responsible for building and evolving a modern platform that supports Epassi’s product vision. We are adding this role to strengthen our backend engineering capabilities and establish a solid, scalable foundation for Java Spring Boot services built for long-term growth.
In this role, you will take ownership of one domain, contribute to critical architectural decisions, and help shape how we build, operate, and continuously improve our service landscape across the Epassi group.

Your responsibilities will be:

• Design, build, and maintain high-quality Java Spring Boot microservices as part of our domain bounded context architecture
• Implement event-driven architecture for cross-domain communication and eventual consistency patterns
• Work with PostgreSQL as primary data storage, including schema design with multi-tenancy support and data isolation
• Implement RESTful APIs with proper versioning, rate limiting, and API gateway integration
• Ensure high standards for code quality, comprehensive testing (unit, integration, contract), performance optimization, and security best practices
• Collaborate closely with Product, Frontend (React Native), DevOps, and other backend teams across multiple European markets
• Participate in architectural discussions and technical design reviews, and contribute to platform-wide standards and best practices

You’ll be successful in this role if you:

• Deliver production-ready, scalable microservices that meet target architecture specifications
• Implement clear domain boundaries that avoid cross-domain coupling while enabling integration through well-defined APIs and events
• Maintain code quality with >80% test coverage and contribute to architectural decision records (ADRs) that shape the platform’s future
• Take ownership of the reliability and operability of backend services
• Proactively identify and reduce technical debt
• Communicate clearly and work effectively in a cross-functional team
• Support reliable delivery and smooth operations with a “you build it, you run it” mindset

What you’ll be doing (daily):

• Join a 15-minute stand-up with your cross-functional domain team to align on progress and blockers
• Design and implement features in your assigned domain using Java Spring Boot
• Write clean, testable code with comprehensive unit and integration tests, aiming for >80% coverage before code review
• Participate in code reviews via pull requests, providing constructive feedback and learning from peers
• Monitor synchronization metrics, investigate and resolve data consistency issues
• Collaborate with frontend engineers to clarify API contracts and coordinate feature releases
• Participate in architectural discussions and design reviews for new domain capabilities or cross-cutting concerns
• Deploy services to staging and production using CI/CD pipelines (GitHub Actions), using feature flags for gradual rollouts
• Debug production issues using distributed tracing and structured logging

What you should bring:

• 5+ years of professional software development experience, including 3+ years focused on Java backend development
• Strong expertise in Java (17+) and Spring Boot, including Spring Data JPA, Spring Security, and Spring Cloud
• Hands-on experience with microservices architecture (service decomposition, API design, inter-service communication patterns)
• Solid understanding of Domain-Driven Design (DDD): bounded contexts, aggregates, domain events, anti-corruption layers
• Strong knowledge of relational databases (PostgreSQL preferred), including schema design, indexing, query optimization, and transaction management
• Experience with event-driven architectures using message brokers (Kafka, RabbitMQ, AWS SNS/SQS)
• Proficiency in RESTful API design, including versioning, documentation (OpenAPI/Swagger), and rate limiting
• Strong testing mindset (JUnit, Mockito), plus integration and contract testing (Pact)
• Familiarity with Docker and Kubernetes, including deployment strategies and service mesh concepts
• Experience with CI/CD pipelines (Jenkins, GitLab CI, GitHub Actions)
• Understanding of observability: structured logging, distributed tracing (Jaeger/Zipkin), and metrics (Prometheus/Grafana/Datadog)
• Bachelor’s degree in Computer Science, Software Engineering, or equivalent practical experience

Your track record:

• Delivered and operated microservices in production, showing ownership from design through deployment and maintenance
• Made measurable improvements to performance, reliability, or scalability (e.g., reduced latency, improved uptime, scaled traffic)
• Collaborated effectively in cross-functional teams, demonstrating strong communication and teamwork
• Contributed to technical decision-making through architecture reviews or design documents
• Mentored junior engineers or led knowledge-sharing sessions

Your competency profile:

• Systems Thinking: You understand how components interact in distributed systems and can design for failure scenarios and trade-offs
• Ownership & Accountability: You take end-to-end responsibility and proactively improve operational health and technical quality
• Pragmatic Problem-Solving: You balance ideal solutions with practical constraints while moving the architecture forward incrementally
• Collaboration & Communication: You work well across teams and time zones, document decisions, and share knowledge
• Continuous Learning: You stay current, experiment, and adapt based on feedback and results
• Quality Mindset: You build maintainable, secure, well-tested services and advocate for strong engineering standards

Why You Should Join Us

• Be part of an ambitious growth journey and join a global community of driven, bold, entrepreneurial, yet humble Epassians in a company that is constantly evolving.
• Work with a clear purpose — boosting everyday wellbeing — and create a meaningful, positive impact on both individuals and society.
• Thrive in an open and inclusive culture with low hierarchy, where relationships are built on respect, camaraderie, and shared successes and challenges.
• Come as you are — we’ll bring out the best in you and support your personal and professional growth.
• Join a fast-growing tech company with a strong financial foundation, offering opportunities to grow and make an impact together with us.
• Benefit from an inspiring and supportive work environment where employee wellbeing is a true priority.
• Contribute to solidifying our position as the number one player in Europe’s employee benefit market and help shape the next wave of success.