VDart, Inc.

Build and optimize front-end features for a streaming app focusing on performance and stability on resource-constrained devices. | Strong React and TypeScript experience, Redux state management, React Router familiarity, and front-end performance debugging skills. | Senior Front-End Software Engineer - React Contract Location – Los Angeles, CA / New York City, NY - Remote (but need to report to the office on day 1) Mandate Skills: • React 18.2.0 & TypeScript 5.9.2 • State Mgmt.: Redux, RTK • Routing: React Router • Testing: Vitest, Playwright (familiarity is fine) • Preferred: Someone who has experience in app performance, measuring it, looking into things like debugging JS memory leaks. Job Description: We’re looking for a Senior Front-End Software Engineer to help build and optimize a streaming application used across various devices, most notably Smart TVs. This role is ideal for someone who cares deeply about performance and knows how to keep complex applications fast and stable on resource-constrained devices. What You’ll Do: • Build and maintain front-end features using React 18 and TypeScript • Develop predictable and maintainable state management using Redux and Redux Toolkit (RTK) • Identify, measure, and resolve performance bottlenecks related to rendering, memory usage, and application startup • Debug and mitigate JavaScript memory leaks in long-running applications Required Qualifications: • Strong experience with React and TypeScript • Experience managing application state with Redux and RTK • Familiarity with client-side routing patterns using React Router • Solid understanding of front-end fundamentals (HTML, CSS, modern JavaScript) • Experience with performance optimization - debugging, measurement, and implementation (e.g., profiling, monitoring, or performance tooling) • Understanding of browser internals, rendering behavior, or performance bottlenecks in large SPAs • Ability to work collaboratively in a cross-functional team