Senior Software Engineer, Client Platform

Descript•San Francisco, CA

3d•$195,000 - $250,000•Remote

About The Position

Descript is on a mission to make audio and video content creation and editing fast, easy, and accessible to all. We are building a cutting-edge media editor incorporating real-time collaboration, ground-breaking UX, and cutting-edge AI. This is the future of media! The Builder Experience (BIX) team is one of the critical platform teams at Descript. The group is responsible for the foundations that every product engineer builds on top of. We own the design system, core UI frameworks, client performance, state management patterns, continuous integration, and the libraries and tooling that keep our codebase healthy and our engineers productive. If it touches the client shell, rendering pipeline, cross-cutting frontend infrastructure, or GitHub Actions, it's in our orbit. We're looking for a engineer who is deeply fluent in modern React, passionate about frontend platform work, and energized by making an entire engineering organization faster and more effective. You'll combine hands-on systems work—performance tuning, dependency management, design-system evolution—with a strong coaching and enablement mindset, helping product teams adopt improvements and level up their craft.

Requirements

5+ years of professional frontend or full-stack engineering experience, with deep expertise in React and the modern React ecosystem (hooks, concurrent features, Suspense). The number of years is less important than your ability to get deep into the details of the framework and browser performance.
Demonstrated experience working on a platform, infrastructure, or developer experience team. You've built tools and frameworks that other engineers depend on.
Strong understanding of client-side performance : profiling tools (React DevTools, Chrome DevTools, Lighthouse), rendering optimization, bundle analysis, and runtime performance tuning.
Hands-on experience building or significantly contributing to a design system or component library at scale.
Expertise in TypeScript and modern frontend build tooling
Familiarity with state management approaches in large React applications, and informed opinions about the tradeoffs.
A track record of mentoring, guiding, and influencing other engixneers through documentation, pairing, code review, or internal tooling, not just shipping your own code.
Clear written and verbal communication skills, with the ability to propose technical direction and build consensus across teams.

Nice To Haves

Experience working on tooling in a monorepo : testing strategies, build systems, knowledge of pitfalls and opportunities.
Background in accessibility (WCAG, ARIA patterns) and inclusive component design.
Familiarity with CI/CD optimization for frontend builds and test pipelines.
Experience with Electron or desktop web-hybrid applications.
Contributions to open-source design systems, React libraries, or developer tooling.

Responsibilities

React: Own the use of React across the codebase. Use your expert knowledge of React to fix individual problems, design and ship systemic solutions, educate others, and keep pace with the ecosystem. Establish migration patterns, measure render performance gains, and guide teams through transitions.
Design System: Evolve and scale Descript's component library. Build accessible, composable, well-documented components in close partnership with Design, define contribution standards, and drive consistent adoption across product surfaces.
App Performance: Profile, diagnose, and fix client-side performance bottlenecks. Establish performance budgets, instrument key metrics, and build dashboards that keep the team honest. Design framework-level patterns and tools to make good performance easier to achieve.
Testing & Quality: Builder Experience owns frontend testing. Identify gaps in our testing strategy, identify improvements large and small, and work with the entire engineering org to make changes across the codebase.
Enablement & Guidance: Act as a force multiplier. Write playbooks & docs, deliver tech talks, pair with product engineers, and create local tooling to improve developer speed and quality.