Senior Frontend Engineer building high-performance, video and data-centric applications at Twelve Labs. Leading client-side architecture with strong UX and collaboration on backend integration.
Responsibilities
Build performant, polished experiences with React and Next.js
Lead and evolve client-side architecture for interactive, video- and data-streaming products
Build fluid, asynchronous UIs with strong performance, micro-interactions, and intentional motion
Translate Figma designs into production-ready interfaces
Implement and optimize browser-based video and real-time data streaming
Build UIs that respond to incremental, real-time, or long-running streamed data, not just request/response flows
Handle large video and data workloads within browser constraints (memory, buffering, network variability)
Make informed tradeoffs around video formats, codecs, streaming, and transport
Optimize rendering for complex timelines, lists, and canvases
Write reliable unit, integration, and E2E tests for complex UI workflows
Use AI-assisted development tools thoughtfully to accelerate implementation while maintaining correctness, performance, and code quality
Design and integrate clean, well-scoped APIs to support streaming and async frontend workflows
Implement and integrate authentication flows (sessions, tokens, role-based access)
Collaborate with backend engineers on data models, streaming strategies, and performance tradeoffs
Requirements
8+ years building production frontend applications
Deep experience with React and modern frontend patterns
Strong experience with Next.js & Tanstack Query
Strong client-side performance and UX instincts
Use of component libraries like shadcn & material ui
Experience building browser-based video and data streaming experiences
Working knowledge of HTML5 video APIs and streaming concepts
Comfort working across the stack and making pragmatic tradeoffs
Candidates must be able to travel up to 10% of the time annually to attend conferences, off-site meetings, and other business-related events as required by the role.
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