Senior Java Developer

Salary: 1200-1550 PLN/MD on B2B

Work model: remote or hybrid from Warszawa, Gdańsk, Kraków

Why choose this offer?

• End‑to‑end ownership with a modern tech stack

• Stability combined with continuous growth

• Autonomy and high‑quality collaboration

Project

Join a team building and enhancing a high-performance trading ecosystem for global financial markets. You will work on backend services responsible for trading platform integrations, order management, margin calculations, profit & loss processing, and real-time communication with external trading systems.
This role requires deep expertise in financial systems, precision-sensitive calculations, and integrations with trading platforms through REST and WebSocket APIs.

Responsibilities you'll have:

• 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 in 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

• Leverage AI-assisted engineering tools to improve development efficiency and quality

Expected competences and knowledge:

• 8+ years of experience in backend development

• Strong commercial experience with Java

• Strong commercial experience with Spring / Spring Boot

• Experience integrating external systems through 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 working 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

Nice to have:

• Experience with TraderEvolution

• Experience building trading platforms or brokerage solutions

• Knowledge of market data feeds and trading workflows

• Experience with low-latency or real-time systems

Technologies you'll work with

• Java

• Spring Boot

• REST APIs

• WebSocket APIs

• Microservices

• Financial Trading Systems

• Order Management Systems

• Risk & Margin Services

• Real-time Data Processing

Client – why choose this particular client from the Jit portfolio?

Our client is an international financial services organization operating in the capital markets domain, focused on processing and analyzing large volumes of transactional data. The company develops modern data platforms that support trading, operational efficiency, and regulatory reporting. It operates in a fast-paced, highly regulated environment with a strong emphasis on scalability, data quality, and advanced analytics.

About Jit Team

The Human Factor of IT - it’s not just a slogan, it’s a philosophy. The foundation of Jit Team is people, which is why we prioritise you. We employ over 770 experienced experts, to whom we offer developmental projects, a wide range of benefits, and a proprietary professional development programme. Together with clients from around the world, we create innovative IT solutions delivered by highly specialised and efficient teams.

Behind our maxim are also charitable and educational activities. We support schools, universities, and educational institutions by conducting workshops, running educational projects, sponsoring events, and donating learning equipment. We offer internships that help launch careers in IT. We support water rescuers and hospitals by providing the necessary equipment. We also support numerous charitable organisations helping people in need, children, and the elderly. We are a Polish company and we share what we have achieved over more than 15 years of activity. By supporting local initiatives, we contribute to the circulation of good energy.