Senior Java Developer

1 day ago

Kraków Warszawa Łódź Poznan, Czech Republic GFT Poland Full time
  • 4+ years of professional software engineering experience, with a strong focus on backend systems.
  • Deep knowledge of Java.
  • Deep experience with Spring
  • Proven ability to work on low-latency systems and build custom tooling.
  • Comfortable with low-level programming (e.g., diving into libraries, modifying or extending functionality as needed).
  • Understanding of multithreading and concurrency in Java.
  • Proficiency with WebSockets and multicast communication patterns.
  • Experience working with MongoDB or other NoSQL databases.
  • Familiarity with functional programming paradigms.
  • Hands-on experience with messaging systems, at least three messaging tools (e.g., Solace, in-memory topics).
  • Designing and working with high-performance messaging infrastructure.

Nice to have:

  • Experience with Scala, or willingness to learn on the job.
  • Knowledge of native database access libraries (e.g., bypassing ORMs for performance-critical access).
  • Understanding of fixed income trading, specifically: Bond trading and derivative instruments; Order placement, pricing algorithms, position management, and risk assessment.
  • Exposure to post-trade processing, settlements, and reconciliation (e.g., Spectre system).
  • Experience building data pipelines focused on data integrity and consistency (rather than large-scale data processing).

Why join GFT?

You will work with and learn from top IT experts. You will join a crew of experienced engineers: 60% of our employees are senior level.

You will work in a stable company (32 years on the market) in demanding and challenging projects for the biggest financial institutions in the world.

We offer you:

  • Working in a highly experienced and dedicated team
  • Competitive salary and extra benefit package that can be tailored to your personal needs (private medical coverage, sport & recreation package, lunch subsidy, life insurance, etc.)
  • Permanent contract after 3-months' probation period or B2B
  • On-line training and certifications fit for career path
  • Regular social events
  • Access to e-learning platform
  • Ergonomic and functional working space with 2 monitors
,[Design, implement, and maintain high-performance backend components supporting bond and derivative trading systems. , Develop and optimize low-latency services, ensuring reliability and scalability. , Collaborate with other senior engineers to build internal frameworks and custom libraries. , Investigate and fine-tune existing codebases, especially at the library/tooling level. , Work with messaging infrastructure to support complex trading workflows, including in-memory topic management. , Cooperate with quants, traders, and product teams to translate business needs into robust technical solutions. , Maintain system integrity by ensuring thread safety, messaging consistency, and fault tolerance. , Contribute to the evolution of backend architecture and continuously look for performance improvements ] Requirements: Java, Spring, Messaging, Multithreading, NoSQL, MongoDB, Functional programming, low latency Tools: . Additionally: Life insurance, Training budget, Private healthcare, International projects, Home office, Sport subscription, Lunch card, Free coffee, Free snacks, Free beverages, In-house trainings, Modern office.

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