Senior C# Engineer (Trading Systems)

Want to work on FX electronic trading systems at a top North American bank?

This is an opportunity to engineer the core of global trading, working with ultra-low-latency architectures, real-time market data, and electronic trading systems where milliseconds matter. You will build FX (forex) electronic trading systems and collaborate directly with traders and product teams.

The Role at a Glance

• Senior C# .NET Backend Engineer
• Build high-performance backend services for market data and electronic trading systems.
• Fully remote role for residents of Poland.
• Join the core team; this is not a legacy support role or outsourced secondary team.
• Requires experience building trading systems and understanding financial markets; FX trading experience is ideal.

Why Join Us?

• Work on a large-scale, low-latency trading system.
• Join an actively developed system; the original engineers remain on the team.
• Collaborate with developers across North America and Europe.
• Long-term, fully remote role.

The successful candidate is a strong programmer with current C# development experience, curiosity, open-mindedness, and a desire to learn. English proficiency is required. The role suits candidates interested in understanding systems under the hood, data structures, and debugging application performance issues.

The role is fully remote for a developer in Poland and is intended as a long-term position. Only Polish citizens and legal residents with permission to work in Poland are eligible.

What We Offer

• Work on a high-performance trading system in the financial domain.
• Professional growth through collaboration with capable developers in a supportive, challenging environment.
• Direct collaboration with client teams in North America and Poland.
• Actively build and update a functional system rather than provide technical support or legacy maintenance.
• Long-term opportunity to grow and contribute.
• Flexible, fully remote work based in Poland.
• Competitive compensation and time-off options.

Responsibilities

• Design and implement robust software solutions for FX trading systems using C# .NET.
• Collaborate with teams to research and implement trading-system changes.
• Create thorough test cases to ensure software stability and reliability.
• Work with operations teams to build features and improve existing functionality.
• Support production issues, including independent root-cause analysis and diagnosis.
• Process business requirements with minimal guidance, develop implementation proposals, and deliver them independently or with a team.
• Mentor junior developers.

Requirements

Must have

• 7+ years of professional C# .NET development experience.
• Strong understanding of programming concepts, including algorithms, complexity, multithreading, Java language capabilities, and standard libraries.
• Good knowledge of data structures, .NET collections, commonly used data structures, and appropriate selection of structures.
• Proven experience building backend services for front-office trading systems.
• Deep understanding of front-office workflows and electronic trading platforms in any asset class.
• Experience building or contributing to an electronic trading system in any asset class.
• Expertise in multithreading, event-driven systems, and performance tuning.
• Ability to break down complex workflows into maintainable, high-quality solutions.
• Strong communication skills and comfort in high-stakes, trader-facing environments.
• Knowledge required to build low-latency trading systems measured in microseconds.
• Familiarity with the FIX protocol.
• Ability to work with a 6-hour overlap with US Eastern business hours.

Nice to have

• Familiarity with Broadway FX.
• Familiarity with Java.
• Computer science degree from a top Polish school.

The Recruitment Process

• Submit a CV.
• Complete written questions and a short programming exercise at your own pace.
• Participate in a three-stage interview process:
  • Written screen.
  • Technical screen interview.
  • Three technical interviews with future team members.
• Discuss experience and skills.
• Solve verbal algorithm problems focused on clarity and understanding.
• Complete live coding challenges with no trick questions.
• Successful candidates must pass a standard background check.