Job Title: Senior Java Developer (API & Legacy Modernisation)
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Location: Remote – Spain
Rate: €400 per day
Contract: 6-month rolling contract
About the Role
We're looking for an experienced Senior Java Developer to join a financial services programme focused on modernising legacy platforms and building high-quality APIs. This is a long-term contract opportunity for someone who thrives in complex enterprise environments and enjoys transforming legacy systems into scalable, modern architectures.
Key Responsibilities
* Design and develop robust, secure, and scalable Java-based APIs and microservices
* Lead and contribute to legacy system modernisation initiatives
* Work closely with architects, product owners, and DevOps teams to deliver high-quality solutions
* Improve system performance, reliability, and maintainability
* Contribute to technical design, code reviews, and engineering best practices
* Support integration with internal and external financial systems
* Ensure solutions meet security, compliance, and regulatory standards
Required Experience & Skills
* 10+ years of Java development experience
* Strong experience in API development (RESTful services, microservices architecture)
* Proven track record in legacy platform modernisation and refactoring
* Solid knowledge of:
* Spring / Spring Boot ecosystem
* Microservices and distributed systems
* Cloud platforms (AWS, Azure, or GCP)
* CI/CD and DevOps practices
* SQL and NoSQL databases
* Experience working in financial services / banking / fintech environments xohynlm
* Strong understanding of security, scalability, and high-availability systems
* Excellent communication skills and ability to work in distributed teams
Nice to Have
* Experience with containerisation (Docker, Kubernetes)
* Event-driven architectures (Kafka or similar)
* Experience with domain-driven design (DDD)
Why Join?
* Competitive €400/day rate
* Fully remote role within Poland
* Long-term 6-month rolling contract
* Opportunity to work on high-impact modernisation projects in financial services