Senior Java DeveloperJoin us, and build low-latency systems powering global financial markets!Kraków - based opportunity with hybrid work model (2 days/week in the office).As a Senior Java Developer, you will be working for our client, a global financial institution delivering complex trading and eCommerce platforms used by global markets. You will be contributing to the design, development, and optimization of highly available, low-latency systems that support critical trading desk operations. This role involves collaborating with business stakeholders and cross-functional teams to ensure requirements are fully understood, creating scalable technical designs, and implementing solutions that meet the highest performance standards. You will be leveraging your expertise to build resilient systems that power real-time trading environments.Your main responsibilities: Liaising with business stakeholders to ensure full understanding of requirements Drawing up detailed technical designs aligned with business and architectural needs Collaborating with external consultancies to provide technical and design expertise Implementing technical solutions using industry-standard patterns and methodologies Writing automated unit and integration tests to ensure reliability Performing full testing prior to user acceptance phases Assisting with deployments into development and test environments Participating in support rotations to resolve production issues when required Documenting technical solutions clearly for internal and external stakeholders

Optimizing systems for high performance, scalability, and low latency

You're ideal for this role if you have: Solid experience in Java server-side development with multi-threaded systems Demonstrable experience building highly available and distributed applications Strong knowledge in tuning and developing low-latency systems Understanding of FX spot or equities algorithmic execution and pricing Experience working with enterprise systems and agile delivery practices Knowledge of spot and forward FX market conventions Ability to liaise effectively with Front Office, production support, and IT teams Strong problem-solving and analytical skills Excellent communication and interpersonal skills

Ability to work independently as a self-starter and within a team environment

It is a strong plus if you have: Experience in a front office development team within an investment bank Background in architectural design and solution delivery Knowledge of enterprise integration and messaging technologies such as 29 West or Multicast Familiarity with FIX protocol for financial messaging Experience with time-series databases such as KDB Understanding of lock-free algorithms, threading, and advanced low-latency tuning We offer you:ITDS Business Consultants is involved in many various, innovative and professional IT projects for international companies in the financial industry in Europe. We offer an environment for professional, ambitious, and driven people. The offer includes: Stable and long-term cooperation with very good conditions  Enhance your skills and develop your expertise in the financial industry Work on the most strategic projects available in the market Define your career roadmap and develop yourself in the best and fastest possible way by delivering strategic projects for different clients of ITDS over several years Participate in Social Events, training, and work in an international environment Access to attractive Medical Package Access to Multisport Program Access to Pluralsight Flexible hours & remote work Internal job number #7699 You can report violations in accordance with ITDS’s Whistleblower Procedure available here.