Senior Java Developer

Quick Facts

• Salary: 1200–1550 PLN/MD on B2B
• Work model: remote or hybrid from Warszawa, Gdańsk, Kraków

Description

Join a team building and enhancing a high-performance trading ecosystem for global financial markets. You will develop backend services for trading platform integrations, order management, margin calculations, profit & loss processing, and real-time communication with external trading systems.

Responsibilities

• Design and develop backend services supporting trading platform integrations
• Integrate external trading platforms using REST and WebSocket APIs
• Implement and maintain order management workflows
• Develop margin, risk, and P&L calculation services
• Ensure accuracy of financial calculations, rounding rules, and currency handling
• Optimize system performance and reliability for real-time environments
• Collaborate with product, architecture, and business stakeholders
• Support production incidents and participate in system improvements
• Contribute to technical design decisions and backend architecture
• Use AI-assisted engineering tools to improve development efficiency and quality

Requirements

• 8+ years of experience in backend development
• Strong commercial experience with Java
• Strong commercial experience with Spring or Spring Boot
• Experience integrating external systems via REST APIs
• Experience working with WebSocket-based integrations
• Strong understanding of order lifecycle management
• Strong understanding of margin calculations and P&L logic
• Experience with precision-critical financial calculations
• Knowledge of currency conversion, rounding rules, and financial data processing
• Experience in distributed systems and microservice architectures
• Experience within regulated financial services, brokerage, capital markets, or trading environments
• Ability to discuss practical usage of AI tools in software engineering processes
• Engineering degree is highly preferred

Benefits

• End-to-end ownership with a modern tech stack
• Stability combined with continuous growth
• Autonomy and high-quality collaboration