Senior .NET Developer (FIX & Identity)

O projekcie We are looking for Strong backend engineer with experience in the FinTech domain, working on a microservices and event-driven architecture based on .NET, MongoDB, Redis, RabbitMQ (MassTransit), Pulsar, and Elasticsearch. Experienced in designing scalable distributed systems and collaborating within a 7-person engineering team. Additionally exposed to React development.

Zakres obowiązków

• Design and develop high-quality backend services using C#/.NET or Java.
• 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 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)

Wymagania Critical requirements

• 5+ years of backend development experience
• Strong C#/.NET (Java may be considered)
• Experience building and designing APIs
• Distributed messaging systems and event-driven architectures
• FIX Protocol experience in a capital markets / electronic trading environment
• Experience with financial calculations, pricing engines, or quantitative models
• Hands-on experience with QuantLib (or similar quantitative finance libraries)
• OAuth2, OpenID Connect, IdentityServer or similar authentication frameworks
• MongoDB or other NoSQL databases
• Experience in capital markets, fintech, trading platforms, fixed income, securities pricing