Senior Full Stack Engineer (.NET / React)

Senior Full Stack Engineer (.NET / React)

Warsaw, hybrid, 3 days per week from the office.

Responsibilities

• 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.

Requirements

• 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.