Job Title: Senior Java Developer (API & Legacy Modernisation)

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
~ 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

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