Senior Full Stack Engineer (.NET / React)

• 5+ years of software engineering experience building production systems.
• Strong experience with C#/.NET ecosystem and ASP.NET Core.
• Strong frontend experience with React and TypeScript.
• Experience building REST APIs and handling large datasets efficiently.
• Hands-on experience with ag-Grid, Highcharts, or similar UI/data visualization libraries.
• Strong understanding of authentication, authorization, and serialization mechanisms.
• Experience working with relational databases and performance optimization.
• Strong communication skills and ability to work directly with business stakeholders.

Nice to have:

• Experience in treasury, trading, or financial systems.
• Strong product mindset and UX awareness.

• Build and enhance frontend applications and backend services supporting treasury workflows.
• Develop React/TypeScript single-page applications and reusable UI components.
• Design and implement ASP.NET Core REST APIs with scalable pagination and filtering models.
• Optimize performance across the stack, including APIs, serialization, rendering, and large data grids.
• Collaborate with business stakeholders, quant teams, and product managers to deliver user-focused solutions.
• Drive engineering best practices including code reviews, testing, CI/CD, and production support.
• Investigate production issues and improve observability and platform reliability.
• Mentor engineers and contribute to technical growth within the Warsaw team.