Back End Engineer

JOB SUMMARY The Backend Engineer is responsible for designing and delivering scalable, high-performance backend systems and serviceswithin a capitalmarkets environment. This role drivestechnical direction, champions engineering best practices, and collaborates across teams to build reliable, maintainable, and modern software. The ideal candidate brings deep expertise in C#/.NET (Java acceptable), hands-on experience with distributed messaging systems and NoSQL databases, and a strong foundation in ASP.NET service development. Experience with the FIX protocol and identity, authentication, and authorization systems is strongly preferred. ESSENTIAL DUTIES AND RESPONSIBILITIES Design and develop high-quality backend services using C#/.NET Build and maintain ASP.NET service-side applications with a focus on scalability and long-term reliability. Work with distributed messaging frameworks and event-driven architectures to support high-throughput trading systems. Develop and optimize data solutions using NoSQL databases such as MongoDB. Design and implement financial calculation engines, pricing models, and quantitative algorithms with a strong emphasis on accuracy and performance. Implement and maintain FIX protocol integrations to support electronic trading workflows. Design and enforce identity, authentication, and authorization solutions across backend services. Integrate and work with observability platforms such as Datadog or Elasticsearch to support system monitoring and diagnostics. Ensure numerical precision in financial computations, including proper handling of rounding, accruals, and market conventions. Collaborate with product, UI/UX, frontend, and DevOps teams to align on development and deployment strategy. Build reusable, testable backend infrastructure and uphold consistent coding standards across teams. Implement telemetry and monitoring best practices using Sentry or equivalent tools. Evaluate and adopt new technologies, frameworks, and design patterns to continuously improve engineering outcomes. Mentor engineers on backend development best practices and foster a culture of engineering excellence. Contribute to frontend solutions using React and Redux/Rematch where needed. (nice to have) REQUIRED SKILLS & EXPERIENCE 5+ years of software development experience with a strong emphasis on backend engineering. Strong proficiency in C#/.NET backend development. (Java may be acceptable if the candidate has strong skills with the other requirements, such as the FIX protocol). Proven experience designing and building APIs. Solid background in distributed messaging systems and event-driven architectures. Hands-on experience with the FIX protocol in a capital markets or electronic trading environment. Experience implementing identity, authentication, and authorization frameworks (e.g., OAuth2,OpenID Connect, Identity Server). Experience implementing financial calculations, pricing engines, or quantitative models in a capital markets or fintech environment. Hands-on experience with QuantLib or similar quantitative finance libraries. Experience with NoSQL databases such as MongoDB. Familiarity with telemetry and observability tools such as Sentry, Datadog, or Elasticsearch. Experience building and scaling component libraries or design systems. Familiarity with fixed income or securities pricing concepts. (nice to have) Familiarity with Pulsar, Databricks, or Lakehouse architectures. (nice to have) Hands-on experience with SignalR or WebSocket-based systems. (nice to have) Strong communication skills and a proven track record of cross-functional collaboration.