Senior Java Developer (Finance/FinTech)

📍 Kraków (Fully Remote)

💶 €350 per day

📅 6-Month Rolling Contract

About the Role

We’re looking for experienced Senior Java Developers to join a high-performing engineering team delivering robust, scalable systems within the finance/fintech domain. This is a fully remote, 6-month rolling contract offering €350 per day, with strong potential for long-term extension.

You’ll be working on high-throughput, low-latency backend systems where performance, reliability, and clean code truly matter.

Tech Stack

• Java (8+/11/17 preferred)
• Concurrency & Multithreading
• Test-Driven Development (TDD)
• RESTful APIs & microservices architecture
• CI/CD pipelines
• Strong understanding of performance optimisation and JVM tuning

Key Responsibilities

• Design and develop high-performance, scalable backend systems in Java
• Implement concurrent and multi-threaded solutions for real-time processing
• Write clean, maintainable, and fully tested code using TDD practices
• Contribute to architectural decisions and system design
• Collaborate with cross-functional teams including product, QA, and DevOps
• Ensure high availability, resilience, and performance of critical financial systems

Requirements

• 5+ years of professional Java development experience
• Strong hands-on expertise in concurrency and threading
• Proven experience applying TDD in production environments
• Background in finance or fintech (highly desirable)
• Experience building distributed systems
• Strong problem-solving skills and attention to detail
• Excellent communication skills (English required)

Nice to Have

• Experience with messaging systems (e.g., Kafka, RabbitMQ)
• Cloud experience (AWS, Azure, or GCP)
• Knowledge of financial products, trading platforms, or payment systems