Senior Java Software Engineer

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

Location:

Remote – Poland

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