Senior Frontend Software Engineer

A company is looking for a Frontend Senior Software Engineer.

Key Responsibilities

Design and develop modern, interactive UI components for the Firefox Profiler using TypeScript, React, Redux, and related web technologies

Build high-performance, scalable, accessible, and maintainable user interfaces that visualize complex performance data

Engage with other Firefox engineers to help them learn how to use performance tools efficiently and promote their usage

Required Qualifications

5+ years of experience in JavaScript / TypeScript, React, Redux, and browser-based UI development

Strong background in building complex, interactive UIs that manage large data sets efficiently

Knowledge of profiling, performance tooling, and testing

Experience with frontend testing frameworks (e.g., Jest, React Testing Library) and best practices in maintainable UI codebases

Experience working with performance visualization is a plus