Senior Java Backend Engineer (Core Java, Trading Systems) w Lublin, Polska

Must have

• Strong understanding of programming concepts, including algorithms, complexity, and data structures.
• Good knowledge of the data structures in the Java standard library - both breadth and internals.
• Experience building distributed service-based applications based on message queues.
• Strong analytical and problem-solving skills, to effectively diagnose production performance issues measured in microseconds.
• Open mind, curiosity, and a strong desire to learn new technologies and business domains.
• Ability to clearly explain non-trivial systems and algorithms.
• Ability to follow and understand technical conversations.
• Know when and how to ask questions that speed up learning.
• Ability to align your working schedule to US Eastern business hours.

Nice to have

• Experience with financial markets and trading systems.
• Knowledge of AWS systems.
• Experience with Spring boot (some teams).
• Experience with JVM tuning (some teams).
• Experience working remotely with North American firms.
• A computer science degree from a top school.

Join the Java Engineering Team at a top N. American Bank

Are you a Java engineer who enjoys working on large scale and high performance software? Do you love working with smart people on meaningful technology? Want to work in capital markets on financial trading systems? If so, read on.

The Role at a Glance

• Senior Java Backend Engineer
• Fully remote for a top N. American bank (for residents of Poland or Romania)
• Openings on multiple teams in the capital markets division (prime brokerage, platform team)
• Part of the core team - this is not a legacy support role or an outsourced B team

We’re hiring experienced backend engineers (6+ years) to join a major N. American bank — directly supporting the development of financial trading systems . This is not a legacy maintenance or support role — you’ll be part of the core product team , building highly-performant, low-latency systems used across the firm.

Are you a passionate Java developer who thrives on solving complex problems in low-latency, high-throughput trading systems ? Join us and work on interesting financial system engineering problems.

Why Join Us?

• Work on a large-scale, low-latency trading system processing millions of daily transactions.
• No Legacy: Join an actively developed system — the engineers who built it originally are still on the team.
• Collaborate with a world-class team of developers across North America and Europe.
• Enjoy the stability of a long-term, fully remote role that only a bank can offer.

A successful candidate will be a very strong programmer with current Java development experience. They must also be curious, open-minded, and desire to learn new things. English proficiency is a must.

This role is for developers who excel at programming core Java from the ground up, not just integrating frameworks or APIs. If you’re fascinated by understanding systems ‘under the hood,’ this role is for you. Successful candidates enjoy geeking out about data structures and debugging application performance issues.

This is a fully remote backend Java development role for a developer in Poland or Romania . You will be working through a Polish company that will provide the support and administrative assistance to make you successful in the role. We are looking for people to join the team long-term.

Different teams have different working hour arrangements. For all roles, to ensure efficient onboarding, you’ll work in sync with the American team during US Eastern business hours for the first two months . Working this way maximizes your time overlap for answering questions, which means you can learn quickly. That means working until 21:00 CET. After that, some teams offer more flexibility your schedule can shift closer to standard Polish business hours.

Only open to residents of Poland and Romania. Citizens and legal residents with permission to work in Poland or Romania are welcome.

What we offer

• Work that matters in the financial domain: Work on a trading system at an established financial institution, processing millions of transactions daily.
• Professional growth: Collaborate with smart, highly capable developers in a supportive and challenging environment.
• Direct collaboration: You will work directly with the client team in North America and in Europe.
• 1st-tier work : This is not a technical support or legacy maintenance role. The system is functional and is actively being built and you will take part in updating it. The people who built the system are still part of the team.
• Long-term commitment: This is not a fixed-scope or fixed-term outsourcing role; we value people who want to grow and contribute long-term.
• Flexibility & remote work: Fully remote position with increasing schedule flexibility post-onboarding.
• Competitive Compensation: Above-average pay and ample time-off options.

,[ Design and implement robust software solutions for the bank’s trading systems using core Java (versions vary from team to team, and include 8, 17 and 21)., Understand, develop, and improve the subsystems used by other teams in the trading platform., Create thorough test cases to ensure software stability and reliability., Collaborate with operations teams regarding building new features and improving existing functionality., Support production issues, including root-cause analysis and diagnosis.] Requirements: Java, Core Java, Algorithms, Data structures, Message queues, JVM tuning, AWS, Spring Boot, Fintech / Trading Tools: Jira, Bitbucket, GIT, Jenkins. Additionally: International projects.