About SusquehannaSusquehanna International Group (SIG) is a global quantitative trading firm founded on game theory and decision science. With offices around the world, including our rapidly growing team in Dublin, we bring together brilliant minds across technology and quantitative research to excel in dynamic financial markets. We specialise in derivatives trading and are recognised leaders in market making, systematic strategies, and cutting-edge technology development.About the RoleWe're looking for a C++ Developer to join our Trading Technology team in Dublin. In this role, you'll design, build, and optimise high-frequency trading systems that process massive data streams in real time. You'll work side-by-side with experienced technologists and quantitative analysts, gaining deep exposure to the logic and technology that powers automated decision-making in global financial markets. Trading experience is beneficial but not required.ResponsibilitiesDesign and develop low-latency, high-throughput trading applications using modern C++ in a real-time environment.Collaborate with quantitative researchers and technologists to implement and refine strategies.Build and tune systems to achieve optimal performance, reliability, and scalability in a competitive trading landscape.Optimise and troubleshoot infrastructure for latency, throughput, and system bottlenecks.Own the full software development lifecycle—from idea to production—while contributing to our long-term architecture and tooling.QualificationsA degree in Computer Science, Engineering, or a related technical field.3+ years of professional experience developing performance-critical applications in modern C++ (C++11/14/17/2023).Required SkillsStrong command of multi-threading, memory management, IPC, STL, Boost, and network/socket programming.Deep understanding of performance tuning, profiling, and optimisation methodologies.Familiarity with designing high-performance systems in real-time environments (prior trading or financial industry experience is a plus, but not required).Passion for solving challenging technical problems, iterating quickly, and writing clean, maintainable code.Why You'll Love It HereReal Impact: Your work will be central to SIG's technology operations, directly impacting decisions and performance in global markets.Collaboration: You'll partner directly with quants and technologists, working on cross-functional teams where your input truly matters.Challenge & Growth: We value individuals who thrive on solving hard problems and continuously push to learn and improve.Culture of Excellence: Our flat structure and informal environment encourage innovation, fast feedback, and hands-on ownership.Benefits & Perks: SIG offers a highly competitive compensation package, along with extensive benefits designed to support you both professionally and personally.Equal Opportunity StatementWe're committed to building a diverse and inclusive workplace. We encourage candidates from all backgrounds to apply and are happy to provide reasonable accommodations during the hiring process.